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Old 11-15-2007, 09:09 PM
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Highway RPMs too high

I own an 88 2.0 liter S that is totally stock. Engine rpms at 60 mph are about 3000rpm in 5th gear. Has anyone experimented with taller tires? I don't care about speedometer accuracy but it sure would be nice to drop a few hundred rpm. Tires are 185/70-13.
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Old 11-15-2007, 09:35 PM
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my dad has a 88 2.0 S and im not sure how high his rmp's are at 60 but u can still feel her tryin to pull, almost like theres another gear! i think its just the gearing of those trannies! and i beleive those are the same size tires my dads lude has!

edit: i just talked to my dad and he said at 60 his rpm's are around 3000 and at 65 his rpm's are more like 3500, with the same size tires ur runnin and completely stock also! its just the gearing on those trannies! so no worries!
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Old 11-15-2007, 09:40 PM
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Yeah, you're right. It feels like there should be another gear. The problem is definitely the final drive ratio. Just wondering if it could be fixed somewhat with taller tires cuz I am not about to tear the tranny apart. It was after all a $500 car!!
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Old 11-15-2007, 09:45 PM
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as far as fixing it w/ taller tires im not sure. u can try if u'd like. but i doubt it will tear ur tranny apart. just make sure ur trans doesnt have any leaks or anything like that and flush and refill ur trans and u'll be all good! and nice pick up for 500 bucks! oh i almost forgot... WELCOME to the site! get ur posts up and get some pics up!
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Old 11-15-2007, 09:53 PM
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Couldn't you just shift in a higher rpm for the first few gears?
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Old 11-15-2007, 10:02 PM
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even in my 4th gen i'm at 3K @ 60, and 4K @ 80. its just something you gotta get used to.

to 3GC: he's not saying new tires will tear his tranny apart. he wants to get taller tires to increase the overall diameter of the wheel which will somewhat lower the engine speed at any given speed, instead of tearing his tranny apart to replace the gears/final drive gear with a taller gear.
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Old 11-15-2007, 10:04 PM
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Quote:
Originally Posted by twokexlv6coupe View Post
even in my 4th gen i'm at 3K @ 60, and 4K @ 80. its just something you gotta get used to.

to 3GC: he's not saying new tires will tear his tranny apart. he wants to get taller tires to increase the overall diameter of the wheel which will somewhat lower the engine speed at any given speed, instead of tearing his tranny apart to replace the gears/final drive gear with a taller gear.
oh i know that he wasnt sayin that. i was sayin that his rpm's being that high wouldnt tear his trans apart!
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Old 11-15-2007, 10:13 PM
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My 4th gen goes 60@3000 rpm and 80@4000...a lot of people who I've talked to say their hondas are also like that...but people with vtec say their rpms are lower...so i think its a non vtec thing...even my automatic accord w vtec only takes like 2400-2500 rpms to go 60 and like 3200 for 80

i only have 4 gears though....you get 3000rpm@60 in 5th?

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Old 11-15-2007, 10:13 PM
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It would be nice to get down to about 2600rpm in 5th at 60mph. As high as it revs on the highway though, it gets great mileage....38mpg US....6ltr/100kms. I've been making 12 hour road trips and it would be nice to drop the rpms. I think the engine could handle it.

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Old 11-15-2007, 11:37 PM
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my cars the same way and i burn oil at high rpms so it really sucks
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Old 11-15-2007, 11:44 PM
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No, Vtec engines dont rev any lower than that, at 65 im @3500 and at 80@4000 give or take 100... the h22a have closer gear ratios than the h23 or f22, wouldnt that make this whole thing worse?
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Old 11-16-2007, 12:07 AM
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intereting..i dont know
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Old 11-16-2007, 12:20 AM
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yep, H22s have the shortest gearing, F22s have the longest, and H23s are in the middle, so i'm pretty sure H22's should be screaming even worse @ highway speeds

someone with a duece-duece should chime in right about now
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Old 11-16-2007, 12:23 AM
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the duece duece and the 3rd gens have the same speed at the same rpms. at 3000rpms 60mph.... it's a prelude thing I guess... my tranny is a euro r tranny and my fifth is the same as the usdm fifth gear... will it's a little taller but just a little.
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Old 11-16-2007, 12:37 AM
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This is normal for a 3rd gen...

You can install an accord 5th gear... great way to save gas on the highway.
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Old 11-16-2007, 12:54 AM
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I'm going to start looking into taller tires and clearances.
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Old 11-16-2007, 11:25 PM
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I ran a 205/50/16 tire on my 3rd gen with a 2 1/2" drop. No problems...
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Old 11-16-2007, 11:30 PM
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Yea my h22 runs about 3000 in 5th gear at 65 or so, im usually doing 80ish at about 4k on the highway.. makes me want to back off to save my gas.. haha

Really wish it has a 6th gear for highways...
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Old 11-17-2007, 03:34 AM
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The 185/70-13 turns about 886-893 revs/mile. A 205/55-17 about 806 revs/mile. That converts to about 2640 rpm as opposed to 3000. Question is whether it would fit in the wheelwells. Seems like it would. A 205/70-15 turns 783 revs/mile. That translates into about 2570 rpm.
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Old 11-17-2007, 04:40 AM
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i got a new muffler i now get about 500 rpm less then i did b/4 2500@60 and i can tell my rpms drop a lot sooner when i let off the gas and get a a lil bit better mpg too
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Old 11-17-2007, 10:39 AM
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i got a new muffler i now get about 500 rpm less then i did b/4 2500@60 and i can tell my rpms drop a lot sooner when i let off the gas and get a a lil bit better mpg too
what kind of muffler and how much $
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Old 11-17-2007, 10:42 AM
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Quote:
Originally Posted by KIPHEBEL View Post
The 185/70-13 turns about 886-893 revs/mile. A 205/55-17 about 806 revs/mile. That converts to about 2640 rpm as opposed to 3000. Question is whether it would fit in the wheelwells. Seems like it would. A 205/70-15 turns 783 revs/mile. That translates into about 2570 rpm.
which ones are on yours now and which ones are supposed to be on it...i have the 205/55-17 on mine i believe
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Old 11-17-2007, 02:01 PM
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what kind of muffler and how much $
its a 3A racing carbon fiber muffler i got it for 50 from a guy down the road he said it was 100 i think b/c its cf and has to vents you can adjust the flow of the exhaust flow but i think any muffler you get will help b/c of the back pressure
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Old 11-17-2007, 02:44 PM
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thanks
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Old 11-17-2007, 02:47 PM
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i got a new muffler i now get about 500 rpm less then i did b/4 2500@60 and i can tell my rpms drop a lot sooner when i let off the gas and get a a lil bit better mpg too
That doesn't make any sense, a muffler would not reduce RPM's, the only way to lower your RPM's wwould be to change gear ratios or as KIPHEBEL is doing and going to taller tires.
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Old 11-17-2007, 02:54 PM
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I just found out that our cars(3rd gens) optimum rpm for good gas miles is around 3200-3500 so we aren't really wasteing gas. I looked it up in my manual from honda.

Though mine is it sucks my clutch is slipping at high rpms so somtimes I do 80 at 4k and somtimes somewhere around 4.5k >.> it sucks.. Plus my engine is about to crap out so I'm only getting 20mpg as opposed to the 28ish our cars should get..
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Old 11-17-2007, 04:20 PM
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well i guess all 2000 do 60 mph at 2500 then b/c mine does and thats all i got
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Old 11-17-2007, 11:37 PM
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Originally Posted by 89'si4ws View Post
I just found out that our cars(3rd gens) optimum rpm for good gas miles is around 3200-3500 so we aren't really wasteing gas. I looked it up in my manual from honda.

Though mine is it sucks my clutch is slipping at high rpms so somtimes I do 80 at 4k and somtimes somewhere around 4.5k >.> it sucks.. Plus my engine is about to crap out so I'm only getting 20mpg as opposed to the 28ish our cars should get..
Wrong.... this makes no sense at all. People have been doing the accord 5th gear swap for a while now and are roughly around 2500-2700rpm at 65mph. With an exceptional 30+mpg highway. One member recorded a 36mpg setup with the accord fifth gear.... I used to get around 28 at best with the stock 5 speed.


edit: A muffler or any engine modifications wont improve your mph/rpm ratio.... that's a joke post.
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Old 11-18-2007, 12:58 AM
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Eh thats what my honda manual told me. I thought it was right. Oh well. I'm wrong sorry for the misinfo.
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89' prelude 2.0 si 4ws
amazing.
bone stock.
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Old 11-18-2007, 01:30 AM
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Honda thought the 3GP oiling system was optimal..... we have thousands of #3 rods blown because of it...
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