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Old 06-12-2014, 02:23 PM
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Few questions about my prelude

Ok, so recently I started noticing a few things happening with my car that I'm not too happy about, and want to see if anyone has any suggestions for me before I drop cash into something I don't need or that won't fix it. Any suggestions or help would be greatly appreciated.

A couple weeks back I hydro-locked my motor and managed to get lucky and not ruin anything. the CAI was in my front bumper which sits less than 2" off the ground, and I was stupid and went through a 2' deep flood area under a bridge (water up to the bottom of my door). I was used to the CAI of my old mustang being near the battery and I never had a problem with the water before. But anyways, nothing was ruined luckily. I know it sucked up some nasty water through the throttle body though. The plugs were obviously soaked, so I bought 2$ plugs from walmart as a temporary fix, but still haven't changed them yet.

Basically my car has a CAI with a brand new filter relocated next to the battery, cheap 2$ spark plugs, throttle body that might be ruined (I cleaned it twice since the flooding though), and a cheap universal cat that might be clogged. Also running 17" wheels but I don't see that affecting anything.

1.) When I sit at any RPM, or put it in cruise control, it stutters a bit and rides like crap

2.) sometimes it takes 8-10 cranks before it starts, other times it takes 1

3.) I get roughly 21mpg in the city and only like 23mpg on the highway (not matter how easy or rough I drive it, doesn't seem to matter)

4.) my car feels like it's got 120hp with vtec kicked in when it should be pushing atleast 160whp based on what's been done and what other people get on the dyno. It's very tough to keep up with traffic without high-revving it and giving like 3/4 throttle until I get up to speed. It feels as slow as my old non-vtec hatchback civic which pushed like 90hp at the crank

5.) it's very tough to get my car rolling from a dead stop in 1st gear, if I don't burn the clutch till like 5mph, it surges back and forth very slightly almost stalling on me. It's impossible to get rolling in 2nd gear (clutch only has 13k miles on it, so it's obviously not normal)
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Old 06-12-2014, 02:33 PM
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Re: Few questions about my prelude

Do a compression test
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Old 06-12-2014, 03:12 PM
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Re: Few questions about my prelude

I planned on doing one tuesday (my first day off from work), but I doubt all the issues would come from low compression. And I'm afraid to find out for sure that I have a bad ring..lol
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Old 06-12-2014, 03:15 PM
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Re: Few questions about my prelude

+ leak down test
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Old 06-12-2014, 03:32 PM
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Re: Few questions about my prelude

Have you changed the oil?

This may sound stupid, but park on a hill with the car front uphill and make sure you don't have water in your exhaust pipe.
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Old 06-12-2014, 03:56 PM
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Re: Few questions about my prelude

I've done 3 oil changes since the flood, since I had water in the oil. But once the milky oil was flushed out, it stayed clean. And it's been a couple weeks since then, and I'm pretty sure all the crap in the motor has blown out by now. I park on a hill daily, so water in the pipe isn't possible. I'm thinking the cheap universal cat is clogged which could, in theory, cause every issue I'm having. But this is my first Honda that I've looked at parts for, so I don't even know where to begin looking for a cat, or what brands are good. All my other cars were cat-less (previous car was a built foxbody mustang)
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Old 06-12-2014, 03:59 PM
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Re: Few questions about my prelude

Maybe I'm just expecting too much from it? I mean I came from a mustang that could break the tires loose in 3rd gear...so maybe it's normal and I'm just expecting too much from a front wheel drive 4 cylinder
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Old 06-12-2014, 05:06 PM
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Re: Few questions about my prelude

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Originally Posted by decreiptoyster5 View Post
Ok, so recently I started noticing a few things happening with my car that I'm not too happy about, and want to see if anyone has any suggestions for me before I drop cash into something I don't need or that won't fix it. Any suggestions or help would be greatly appreciated.

A couple weeks back I hydro-locked my motor and managed to get lucky and not ruin anything. the CAI was in my front bumper which sits less than 2" off the ground, and I was stupid and went through a 2' deep flood area under a bridge (water up to the bottom of my door). I was used to the CAI of my old mustang being near the battery and I never had a problem with the water before. But anyways, nothing was ruined luckily. I know it sucked up some nasty water through the throttle body though. The plugs were obviously soaked, so I bought 2$ plugs from walmart as a temporary fix, but still haven't changed them yet.

Basically my car has a CAI with a brand new filter relocated next to the battery, cheap 2$ spark plugs, throttle body that might be ruined (I cleaned it twice since the flooding though), and a cheap universal cat that might be clogged. Also running 17" wheels but I don't see that affecting anything.

1.) When I sit at any RPM, or put it in cruise control, it stutters a bit and rides like crap

2.) sometimes it takes 8-10 cranks before it starts, other times it takes 1

3.) I get roughly 21mpg in the city and only like 23mpg on the highway (not matter how easy or rough I drive it, doesn't seem to matter)

4.) my car feels like it's got 120hp with vtec kicked in when it should be pushing atleast 160whp based on what's been done and what other people get on the dyno. It's very tough to keep up with traffic without high-revving it and giving like 3/4 throttle until I get up to speed. It feels as slow as my old non-vtec hatchback civic which pushed like 90hp at the crank

5.) it's very tough to get my car rolling from a dead stop in 1st gear, if I don't burn the clutch till like 5mph, it surges back and forth very slightly almost stalling on me. It's impossible to get rolling in 2nd gear (clutch only has 13k miles on it, so it's obviously not normal)

NGK or go home
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Old 06-13-2014, 12:55 AM
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Re: Few questions about my prelude

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Originally Posted by decreiptoyster5 View Post
Maybe I'm just expecting too much from it? I mean I came from a mustang that could break the tires loose in 3rd gear...so maybe it's normal and I'm just expecting too much from a front wheel drive 4 cylinder
Bud you can't compare a Stang to a Lude.
Your expecting too much from a Lude.
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Old 06-13-2014, 01:12 AM
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Re: Few questions about my prelude

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Originally Posted by decreiptoyster5 View Post
so I don't even know where to begin looking for a cat, or what brands are good.
atleast catco & magnaflow are good

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Originally Posted by blacklud View Post
Your expecting too much from a Lude.
yeah 190-230hp is not much
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Old 06-13-2014, 09:35 AM
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Re: Few questions about my prelude

I don't expect to be able to break the tires loose in 3rd, or break 100 in 4th gear on the entrance ramp anymore, but I do know if I had 200hp it should be quick, atleast quicker than most. I shouldn't have to drive it hard to keep up with traffic, and from what I've seen on here, most people average 25mpg in the city and I don't even get that on the highway. I'll be doing a compression test and changing the plugs on tuesday, as well as buying a remanufactured TB from autozone. If I notice a difference from the TB, I'll return it and buy a brand new one online.

As far as a TB goes, is 66mm too big? I don't want to go too big and end up messing with my A/F ratio too much. Here's what I'm looking at Skunk2 Alpha 66mm
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Old 06-13-2014, 09:59 AM
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Re: Few questions about my prelude

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Originally Posted by decreiptoyster5 View Post
if I had 200hp it should be quick, atleast quicker than most.
nope. preludes are heavy

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Originally Posted by decreiptoyster5 View Post
As far as a TB goes, is 66mm too big?
with stock engine you dont gain anything from bigger tb
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Old 06-13-2014, 10:06 AM
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Re: Few questions about my prelude

Save your money on the TB, its not needed. If you did indeed ingest water, it would've bent rods/valves/blown out your rings. Which is why I said compression/leakdown test, to see if your cylinders are even holding pressure. Maybe you got lucky.

I agree with a clogged cat would give you some of those symptoms, so I'd start there. since it's "fairly" cheap.
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Old 06-13-2014, 04:35 PM
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Re: Few questions about my prelude

The way the 5th gen is geared, it zooms pretty good. Not head snapping like some hi po big 6's n 8's. But still a thrill to many.

Do the maintenance work and see if you gain some zip. A big tb is useful when your engine is built up to need more fuel to keep up. 62 is plenty until you start throwing big power around, supply more fuel with larger lines and have the giddy up n go to burn up all that extra fuel and air.


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Old 06-13-2014, 04:56 PM
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Re: Few questions about my prelude

Well After the flooding happened, and after changing the oil, I have no milky oil, and no oil in the radiator fluid. And there is no knocking sound. But some of the problems I'm having came from before I flooded it.

I'm going to do a magnaflow cat, and order a new skunk2 intake manifold and TB on tuesday. It's a good excuse to buy some parts.

Also, completely off topic but has anyone here bought/seen a pair of the CCFL projector headlights off ebay? Mine have the painted eyeliner on them and are ugly as all hell, and I love the look of the projector style headlights

97 01 Honda Prelude CCFL Halo Projector Headlight SH S | eBay
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Old 06-13-2014, 05:18 PM
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Re: Few questions about my prelude

Oh and I'm certain It sucked in water. Got water in the oil from being overfull, and when I dry cranked it, it spit atleast a gallon of water out + the gallon that was in my cold air piping. But it sucked it up at around 900-1100 rpm's so I don't think it was enough to bend anything.
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Old 06-13-2014, 11:12 PM
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Re: Few questions about my prelude

Alright, so I noticed an exhaust leak today, and I was just kinda poking random things cuz why the hell not, and I poked the TPS sensor, and the car stalled. Fired it back up, CEL was on and it was idling and running like ****. Pulled the neg off the battery to reset it, and it went normal. The plug is a bit loose and it's not the original TPS sensor (I know because the screw heads weren't rounded off)...I'm gonna blame all my problems on that for a few days, since I just ordered one. Hopefully that solves my problems. If I barely touch it though it screws with my idle and my RPM's. So I'm thinking if I hit a bump or something, it's moving it and causing problems. Which could be the reason for the inconsistency in throttle, horsepower, gas mileage, and the stuttering
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Old 06-14-2014, 03:25 AM
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Re: Few questions about my prelude

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Originally Posted by decreiptoyster5 View Post
and order a new skunk2 intake manifold and TB on tuesday.
skunk2 IM requires chipped ecu or some engine management unit that you can get new tune.... do some research first

and again - you dont need bigger tb if you dont do engine internals

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It's a good excuse to buy some parts.
no its not - whats the point of upgrading engine which doesnt even work properly?
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Old 06-14-2014, 01:39 PM
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Re: Few questions about my prelude

I know I don't NEED the bigger TB, but it's all that's left to do inside and out of the car besides reworking the engine itself (besides the stuff I'm fixing this week ofcourse). From the little bit of research I did, It shouldn't decrease performance or gas mileage any, but I won't see much of a difference. I agree there is no point in buying parts when it's not running perfect, but I have the funds right now, so it's not too big of a deal. I know I'm changing one thing at a time until I figure it out. And the TB is on my list of stuff to change. I'd rather get a wide TB matched with a new manifold now, than spend 150$ on a stock one and end up spending more money on aftermarket later down the road. If I find the problem before I get to swapping out the TB, than I won't do it. But if it comes down to changing it, I'll be going with the skunk2 IM & TB.

Oh, forgot to mention that I pulled the TPS sensor off today, and compared it to a dorman autozone replacement. My plug fit snug on the dorman one, but not on the current one on my car. Also, the one on my TB now isn't adjustable, it's just meant to be bolted down tight and that's it. No oval holes to turn it or adjust it or anything. That is starting to sound more and more like the cause to all my problems. Only downside is, the dorman one is over 60$ at the store..So I just ordered it online off rockauto. Should be here by wednesday would be my guess

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Old 06-14-2014, 01:50 PM
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Re: Few questions about my prelude

Oh and as for the Skunk2 IM & TB, I found a deal on the pair brand new for 225$, that's why I'm considering them. I wouldn't even consider spending the close to 600$ they retail for together
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Old 06-15-2014, 04:39 AM
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Re: Few questions about my prelude

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Oh and as for the Skunk2 IM & TB, I found a deal on the pair brand new for 225$, that's why I'm considering them. I wouldn't even consider spending the close to 600$ they retail for together
your stock ecu wont work with skunk2 IM

+ chipped ecu ~200$ (or hondata etc 600$)
+ obd1 conversion harness 100$
+ tune ~400$
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Old 06-15-2014, 08:26 PM
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Re: Few questions about my prelude

Next paycheck should be 500$ +, and al my bills are paid. So I planned on doing some looking into buying a neptune RTP + a chipped p28. The only thing I'm confused about is the wiring, but that's what I'm looking into.

Also, off topic question but I have a Mugen header. I'm not too happy with how loud it is and I'd love to quiet it down. I found a deal on a DC header. Anyone have any experience with them? I know it won't get the HP gains that the Mugen gives, but I'm wondering if it's any quieter that what I have. It's the cheapest route to making my car quiet, because I can just put my car up on a lift and change the header myself for free. The local exhaust shop charges like 130$ to weld in a muffler (plus the price of a muffler).
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Old 06-15-2014, 08:41 PM
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Re: Few questions about my prelude

Ok so This seems fairly straight forward, but I just want to make sure I'm not missing something here. In order to run a tuner like neptune, I need the tuner, the harness, and a new ecu right? Will the couple things I found below work? I'd prefer to go with neptune over hondata just because of price, and the reviews I've read

Boomslang OBD2A to OBD1 ECU Conversion Harness BSF-2AT1 - King Motorsports Unlimited, Inc.
Neptune RTP / Demon V2 / P28 ECU Package

Also, I've worked with a tuner before on a mustang, so I want my own tuner with my own software to screw with. I know the risks and all that fun stuff, but I want to have the ability to do my own if I decide to. That being said, once I'm done with all the mods I plan on doing, I'll end up having it tuned by a shop
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Old 06-16-2014, 03:38 AM
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Re: Few questions about my prelude

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Originally Posted by decreiptoyster5 View Post
So I planned on doing some looking into buying a neptune RTP + a chipped p28. The only thing I'm confused about is the wiring, but that's what I'm looking into.
buy pre installed neptune ecu and just ob1 conversion harness. then take it to some dyno shop

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Also, off topic question but I have a Mugen header. I'm not too happy with how loud it is and I'd love to quiet it down.
headers dont really effect much to your exhausts sound

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I found a deal on a DC header. Anyone have any experience with them?
ebay/dc/megan = stock replacement headers - no power gains

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Originally Posted by decreiptoyster5 View Post
I know it won't get the HP gains that the Mugen gives
mugen is not great header - gains are not that big
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Old 06-16-2014, 12:32 PM
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Re: Few questions about my prelude

won't I need to have both ecu's hooked up for when I try to get it inspected? That's one thing I'm still confused about

I know mugen isn't the best out there, but I know they push better numbers than stock, and than some other brands. I'll pass them up for now, maybe look into a a new catback exhaust + a cat, and doing it myself. I'm still convinced I need to swap the universal cat, even if the tps sensor is my problem.
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Old 06-16-2014, 12:57 PM
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Re: Few questions about my prelude

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Originally Posted by decreiptoyster5 View Post
won't I need to have both ecu's hooked up for when I try to get it inspected? That's one thing I'm still confused about
if you have to get your car inspected whole thing is not going to work.

stock ecu goes crazy with skunk2 IM so you dont pass with that kind of setup anyway
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Old 06-16-2014, 01:05 PM
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Re: Few questions about my prelude

Then how do people with tuned preludes get past the inspection?
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Old 06-16-2014, 01:06 PM
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Re: Few questions about my prelude

they dont if they live in a state which requires such inspectations?
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Old 06-16-2014, 01:09 PM
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Re: Few questions about my prelude

Hmm..There's a prelude at a shop near me though. Running no cats, and it's running an obd1 ecu (I know because I've talked to the guy about swapping the ecu). I'll have to go talk to him and see how he did it
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Old 06-16-2014, 01:14 PM
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Re: Few questions about my prelude

if you live in strict state like cali you dont have any change. or then you have to take all the mods off and make it stock again - IMO whats the point of upgrading anything if you have to hassle things on/off back and forth all the time

and btw driving without cat is just stupid. there is absolutely no reason to do that - hi flow cats doesnt restrict your engine in anyway
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