My car is hesitating at WOT while entering boost at about 4500rpm. when i increase the throttle slowly and i don't go straight to WOT it doesn't stumble as bad. its really noticeable in 2nd gear. i have an autometer air fuel gauge and it seems to be running lean at WOT but when in boost and at partial throttle it doesn't seem to run lean. when i'm in 4th or 5th on the highway it doesn't seem to misfire/stumble/hesitate. what could it be? could it be the clutch? i have an exedy stage 1 thats about 2 months old. stock flywheel. will a b+m fuel pressure regulator and gauge help my problem? does increasing the fuel pressure matter if i still have stock injector and no real fuel management.

Here's my setup:
B18B (stock)
ngk iridiums gapped at .03
nology wires
msd sci
stock injectors
12:1 FMU
inline fuel pump

HELP!

THANKS IN ADVANCE.

 

Does your CEL go on?

Check your spark plugs, they're probably really black

 

nope not black and no cel

 

Don't FMU's always stumble going into boost, hence part of the reason they suck?

Matt

 

not really cause when i first put the kit on the car it pulled hard and no stumble... at the time i was using zex plugs though. now i have ngk iridiums.

 

Well I know for sure that those platinum / iridium plugs are to be stayed away from with FI. You are better off running some cheapo-copper $.89 cent each plugs and changing them every other oil change or so.

That's probably a big part of your problem right there.

Matt

 

i have a jrsc and just had the same problem, it was the timing retard and it gave me a o2 code so i replaced that too.

 

are u serious? i thought the iridiums were better for FI. i guess that might be my problem. what copper joints do would u recommend? any?

 

Well, this is a shot in the dark but the inline pump and that FMU are putting alot of stress on that fuel pump, possible that the fuel pump could be going out?

 

It's probably just your setup. FMU are none to have a rough transition into boost. A missing link would help smoothen out the transition.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by brixity &raquo;</TD></TR><TR><TD CLASS="quote">what copper joints do would u recommend? any?</TD></TR></TABLE>

NGK ZFR7F-11's gapped to .030