When adding a free flowing exhaust do you lose boost???
Jun 18, 2003, 06:03 AM
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When adding a free flowing exhaust do you lose boost???
Hey all,
I have bin reading on the net and there are some people that lose boost when adding a free flowing exhaust like a cat back or full downpipe + cat back. Are you guys seeing this??? I can't imagine this to be true because the evo runs a closed loop boost contral system??
Thanks
Eric
I have bin reading on the net and there are some people that lose boost when adding a free flowing exhaust like a cat back or full downpipe + cat back. Are you guys seeing this??? I can't imagine this to be true because the evo runs a closed loop boost contral system??
Thanks
Eric
Jun 18, 2003, 08:13 PM
#2
Yes.. common consensus has been that you can lose a few PSI of boost.. Its more prevelant with full exhaust systems than just a Cat back though.. Even if you lose boost, you are actually still gaining power... The other mods like boost controller and S-AFC (Fuel computer) work better..
Jun 18, 2003, 10:02 PM
#3
I don't agree.
You will not lose boost if the stock boost controls are in place such as on the evo. If you have a manual boost controller you will need to re-adjust it to get your boost level back up. This topic has been covered in detail elsewhere in the forum.
You will not lose boost if the stock boost controls are in place such as on the evo. If you have a manual boost controller you will need to re-adjust it to get your boost level back up. This topic has been covered in detail elsewhere in the forum.
Jun 19, 2003, 03:41 AM
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Huh? Lose boost? Heck no, you gain 1-2 pounds due to the exhaust being able to exit the turbo quicker. I had to dial mine down with the MBC after doing the exhaust swap. It had gone from 20 psi to just over 21-almost 22.
Jun 19, 2003, 05:11 AM
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Originally posted by 2Cool
Huh? Lose boost? Heck no, you gain 1-2 pounds due to the exhaust being able to exit the turbo quicker. I had to dial mine down with the MBC after doing the exhaust swap. It had gone from 20 psi to just over 21-almost 22.
Huh? Lose boost? Heck no, you gain 1-2 pounds due to the exhaust being able to exit the turbo quicker. I had to dial mine down with the MBC after doing the exhaust swap. It had gone from 20 psi to just over 21-almost 22.
Thanks for the replys
Eric
Jun 19, 2003, 08:00 AM
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Also, I was looking through Pruven's website. They said you will lose boost with their axle-back exhaust (unless you have a MBC). I'm not sure if this applies to full cat-back or other systems.
Jun 19, 2003, 08:12 AM
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Yes, that's were I saw it. But I also understand the first few EVOs in the country did have boost problems unitl 
solved them. Witch is why I going to have to assume that you will not lose boost with a free flowing exhaust system with the factory closed loop boost contral system.
Eric
solved them. Witch is why I going to have to assume that you will not lose boost with a free flowing exhaust system with the factory closed loop boost contral system.Eric
