how much does exhaust effect your tune?
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get_up_mark
- Posts: 295
- Joined: Mon Nov 29, 2004 5:52 am
- Car: 98 240sx se
how much does exhaust effect your tune?
if i get my car tuned with just the short downpipe how much different will it be when i get the full exhaust built? theres a big gap between my down pipe and exhaust that i need to have made with a 3 inch pipe. will i need to retune my afc2? since turbos rely on backpressure im pretty sure it will different but should i be able to at least drive it with the new exhaust installed?
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sil80drifter
- Posts: 1313
- Joined: Sun Aug 18, 2002 5:53 am
- Car: 1990 240SX Hatch
When I had my exhaust capped, my boost was 6-7 psi. Once I uncapped it (free flowing, similar to downpipe only), boost increased to about 10psi. Everythign else was the same. Expect a boost decrease, when you put the full exhaust back on. It may be drastic (like my case, around 4 psi) or barely noticeable, like 1psi.Exhaust makes a huge difference in tuning, but it's really crucial when you open things up not close them down. Try putting a free flowing exhaust on a 3rd gen RX7 and it'll blow right away because the ECU is not tuned for more boost.
sil80
sil80