S2 Rb25det Spluttering/backfiring After 4000rpm?

[mark660]

hey everyone.

pretty much the cars been running pretty good with the almost standard exhaust just decat and straight through mufflers, i also have a front mount, pod,cold air intake,boost controler.

its been running 10psi on that setup and running 13.67sec at the track no problem at all, then last week i changed just the cat back still running good, then this week i get a dump and front pipe thinking i would gain some power and it wont rev over 4000rpm under boost without just splutering and just running shit, not r&r either, i have felt that when i went over 10 psi with old pipe on.

so is this just the standard computer going stupid because of new pipe? or should i be looking for somthing else before i book it for a tune and put the power fc in?

i also have ngk coppers gapped to 0.8 and new coils.

one more thing do i need to change fuel pump to run 12psi on stock turbo when i get it tuned?

Edited April 16, 2010 by mark660

[lachlanw]

coils

[DVS JEZ]

prob a good idea to get a new fuel pump anyway,

pull the plugs and check the condition

Edited April 16, 2010 by DVS32R

[tridentt150v]

Has your dump interfered with your wastegate flap?

Did you take your 02 sesnor out and put it in the new dump? Did you plug it in? 02 sensors can be a bit fragile when they get older and it might not have liked the transfer?

[mark660]

pulled the plugs today and they looked ok, and its not the o2 as i unpluged it and still no diffrence.

also not the wastegate flap because my boost gauge is reading fine,normally the splitdumps that have that prob.