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2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-08-2003, 04:34 AM   #11
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Quote:
Originally Posted by iRocco
I am not sure I remember the science of this correctly, but I think the size of the pipes suffer from diminishing returns after a certain point. What I recall is something like, when the gases get to a certain point in the pipes, it is cooled considerably and has less volume. Based on this, I had designed an exhaust system for my old GP where the pipe from the headers to the cats was 3", and after that there was a balance tube, and behind that the mufflers and tailpipes were 2". Any larger would have been a wast of money. I still can't figure out why the dual on the V6 would be a drawback though. The physics are the same, right? I mean, you can't change the laws of nature. Does the increased flow somehow reduce the scavenging? Call me confused, I guess.

Hey, I also read something about the cooler thermostats causing the computer to read the temp incorrectly and therefore force more fuel into the mix. Supposedly, this wastes gas, and isn't good for the motor? Can Anyone shed light on this?
A cooler thermostat will tend to cool your intake somewhat. Not alot. This cooler air is more dense. More air coming in and detected by the MAF will cause the PCM to adjust the fuel delivery higher to maintain the proper AFR (your IAT sensor has a little to say about this, too, and the O2 will detect if there'* any unburnt fuel as kindof a double-check to the calculated and delivered AFR). This results in greater power. If you choose to USE that power, efficiency goes down, but if you keep your foot out of it, it can result in slightly higher efficiency. If you actually saw a difference in the wallet at the pump, I'd eat my hat. I saw no change, and I changed the stat and added another tranny cooler at the same time.
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Old 01-08-2003, 05:40 AM   #12
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iRocco, you are a car guy. I agree with you on the whole physics and math. But in the car world, trial and error is always the best way. You can do the dual pipes with a H pipe to balance the pressure before the cat and do 2" behind. Just that from trial and error, you can do a single exhaust and accomplish the same thing. Exactly like the Supra principle I stated earlier in the thread. I just say that you should not do that exhaust from experience. Even the import V6'* use a single tube, just because it doesn't matter. You will just add weight and expense for no reason. But noone is stopping you. Give the dual pipe system a try, then do the single and do your own comparison. Pipe is cheap if you do your own welding.
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Old 01-08-2003, 12:09 PM   #13
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Sounds like a new diet plan there... Hats, high in fiber, low in fat.

Anyhow, thanks for the feedback. I'm not doubting anyone here, just trying to get my mind around the concept.

Right now, I am considering a high flow cat and 3" pipe with high flow mufflers. Can you guys recommend specific parts?

Thanks!
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Old 02-24-2005, 11:49 AM   #14
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Check out Domestic Performance'* website (DP). They have a decent (and the only, I think) selection of ram-air hoods for bonnevilles. They are expensive, but each is custom made to your liking. www.domesticperformance.com
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Old 02-24-2005, 12:10 PM   #15
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Quote:
Originally Posted by SOLID
Check out Domestic Performance'* website (DP). They have a decent (and the only, I think) selection of ram-air hoods for bonnevilles. They are expensive, but each is custom made to your liking. www.domesticperformance.com
*cough* wow alot of dust here *cough*

anyway some members have had alot of problems with DP and we are wating to see if they resolve the problems
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Old 02-24-2005, 01:10 PM   #16
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LMAO. Dust indeed. DP has some problems yes, but I still hear from a lot of satisfied customers. It all depends on what you're getting and when. I know it shouldn't but what can you do if they the only ones carrying what you're looking for? For example, I'm looking for lowering spings. They the only ones I can find that make them to fit my car, unless I want to go directly to a coil spring company and spend 3 times as much, if they make it for me at all. I don't want to change the nature of this thread, even if it is old. Talking smack on DP is beating a dead horse. If there is no major time rush, give DP another chance.
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Old 02-24-2005, 01:16 PM   #17
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Quote:
Originally Posted by SOLID
For example, I'm looking for lowering spings. They the only ones I can find that make them to fit my car, unless I want to go directly to a coil spring company and spend 3 times as much, if they make it for me at all. I don't want to change the nature of this thread, even if it is old. Talking smack on DP is beating a dead horse. If there is no major time rush, give DP another chance.
SOLID check out http://www.bonnevilleclub.com/forum/...ic.php?t=30583
that, they are talkin bout getting custom springs for our cars.. there are a couple of websites on the 2nd page of that topic
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Old 02-24-2005, 01:18 PM   #18
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Quote:
Originally Posted by SOLID
LMAO. Dust indeed. DP has some problems yes, but I still hear from a lot of satisfied customers. It all depends on what you're getting and when. I know it shouldn't but what can you do if they the only ones carrying what you're looking for? For example, I'm looking for lowering spings. They the only ones I can find that make them to fit my car, unless I want to go directly to a coil spring company and spend 3 times as much, if they make it for me at all. I don't want to change the nature of this thread, even if it is old. Talking smack on DP is beating a dead horse. If there is no major time rush, give DP another chance.
We're not beatin a dead horse. People have not gotten productfrom even months ago, even though they sent in their money, which gets sent to other companies to do the work anyways.
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Old 02-24-2005, 03:52 PM   #19
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Please don't dig up old topics that have no real meaning.

www.INTENSE-racing.com has PCM'* now.

This is REALLY old.
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