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Prelude Stock Exhaust Size?

 
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Old 08-06-2015, 08:28 PM
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Prelude Stock Exhaust Size?

Im new to this forum I am looking for some information on Preludes. I am a recent appointed tech inspector at a local dirt track. Im not real familiar with these imports. I had a guy come to me and tell me he needs to run a 3" exhaust or his motor will blow the valves out of it? The rules state 2" only. I've never heard of this before? So I was wondering if anyone could tell me what the STOCK sized of Prelude exhausts were? Thanks for any info anyone can provide.
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Old 08-06-2015, 09:07 PM
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Re: Prelude Stock Exhaust Size?

I'm pretty sure it's 2" OD stock, certainly no more than 2 1/4". Unless he has a massive turbo then 3" is way too big and unnecessary.
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Old 08-06-2015, 10:49 PM
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Re: Prelude Stock Exhaust Size?

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Originally Posted by tassievteclude View Post
Unless he has a massive turbo then 3" is way too big and unnecessary.

you sure about that?
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Old 08-07-2015, 12:11 AM
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Re: Prelude Stock Exhaust Size?

Stock was 2" (50mm) except certain non USDM models that were 2.25"(57mm)...
If he says it's a Type S (5th generation model, right hand drive) it didn't come with a sunroof.
I believe the other high performance model, which was for Europe was also right hand drive.

Tell him "if his valves disintigrate, yall will pick up the parts, and thank him for the dust control" (oil on the dirt).
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welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
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I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

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Old 08-07-2015, 12:15 AM
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Re: Prelude Stock Exhaust Size?

I can see 3" being useful in certain apllications where the motor breaths a lot more efficiently and (hold your breath Blake)...and less back pressure would be beneficial.

But for an ordinary motor with a crappy header, generally stock intake system and non tuned ecu..eh, it's a waste imho.

History; I went a round or two with 98vtec a while ago about back pressure. But OGSMAKDADE enlightened me about what Blake was driving at. I was misinterpreting what was being said at that time and am now on board with what he was getting at.
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Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead

Last edited by bykfixer; 08-07-2015 at 12:19 AM.
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Old 08-07-2015, 04:50 AM
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Re: Prelude Stock Exhaust Size?

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Originally Posted by 98vtec View Post
you sure about that?
Yep.

Not partaking in another **** fight about it though.
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Old 08-07-2015, 05:11 AM
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Re: Prelude Stock Exhaust Size?

^^ pressing inviso like button.
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Quote:
Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead
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Old 08-07-2015, 11:11 AM
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Re: Prelude Stock Exhaust Size?

I found this Exhaust Size calculator online and with a 2" / 50.8mm single pipe, you can run up to 164BHP... Now, of course as you get closer to that 164, the back ppressure will increase. Here's the link so you guys can check it out:

Exhaust Size Calculator

I know this isn't the ultimate say-so in determinining what is large enough, etc etc, but it seems like a pretty good guide.

Besides, low back pressure is only good at WOT as back pressure actually increases low end torque on take-off. That's why some exhaust systems have flaps that are held closed at high manifold vacuum and are opened via springs when the signal decreases.
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Old 08-07-2015, 11:13 AM
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Re: Prelude Stock Exhaust Size?

Just Curious but... What are the limitations on that Racing Bracket/Class? HP range? Naturally Aspirated only? Stock, Semi-MOD, or Full MOD?
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Old 08-07-2015, 01:54 PM
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Icon7 Re: Prelude Stock Exhaust Size?

Thanks guys for the help I thought the guy was blowing smoke but was not positive since I am lacking in the tuner car area.

@tonemeister69 here are the rules from our track

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1. Any front or rear wheel drive, four or six cylinder car. Front engine mounted vehicles only. No station wagons, jeeps, SUVs, or trucks.
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3. Engine must remain stock.
4. Trans axels may be locked.
5. No headers
6. No porting and polishing of any kind.
7. Cold air intakes ok
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9. 6” wide max. for wheels
10. No bead locks
11. Radial DOT street tires only. 8” tread max. No racing patterns or compounds.
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13. Tires must pass tech inspector approval.
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Old 08-07-2015, 03:26 PM
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Re: Prelude Stock Exhaust Size?

Man, that sounds like a Stock-Type class, especially since the Engine/Drivetrain Specs state "No Headers"... I would think that increasing the exhaust diameter up from a 2" exhaust to a 3" would be along the same lines as adding a header and something you would only do if you add a Turbo/SC, Port & Polish, switch out cams, raise the compression, etc... Which none of those are allowed.

If you have any say-so, you may want to suggest the wording be modified to say no aftermnmarket exhaust, or aftermarket ok, as long as the stock diameter is kept, or something along those lines so the fact of matter isn't arguable...

Just my $0.02...
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Old 08-07-2015, 06:22 PM
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Re: Prelude Stock Exhaust Size?

Back pressure is never a good thing.

Back pressure is the force acting against the natural flow of exhaust. Why would you ever want something intentionally clogging up the exhaust? This is why back pressure gauges were designed. To determine where an area of high back pressure is that is creating a negative performance effect.


Those butterfly valves in th exhaust have a lot to do with noise suppression.
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Old 08-07-2015, 07:06 PM
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Re: Prelude Stock Exhaust Size?

do er right and 3" exhaust the first time and never have to worry again, only way to be! even on a stock setup you wont have a issue

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Old 08-07-2015, 08:30 PM
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Re: Prelude Stock Exhaust Size?

That's not the point of this thread, I was merely making a statement of correction to a post. Sorry to throw it off topic
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Old 08-08-2015, 06:47 PM
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Re: Prelude Stock Exhaust Size?

Hey, I am new to this forum and I recently purchased a 1999 Honda Prelude (manual). I am only 14 so i have lots of time to do some stuff to this car that needs to be done. My car has a jdmf20b swap with 66,000 miles on it and 205,000 on the body. This car has been lowered and on some brand of coilers which I forget and has a cool nardi wheel with quick release. So overall I really liked this car from the time I saw it.
But, there are two major problems with this car. 1 the ecu is american and the motor is japanese so the check engine light is always flashing. And the tranny locks up when it goes in reverse and won't downshift into 2nd gear. So, I wanted to ask you enthuisiasts what website is a good place to find that ecu. I would also like to know if i should just get a new transmission or just get the one I already have repaired.

thanks
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