Just Fitted Justjap Fmic - Missing Now!

[benl1981]

Hi there,

Just in the process of finishing mods on R33gtst in order to get a tune (going for around 230-240rwkw).

Installed a Justjap 450 x 300 x 76 tube and fin - With the standard justjap piping kit.

Problem:

I have some missing at low rpm and low throttle inputs.

I have had this since I put the GCG highflow on but it is more pronounced now that's for sure.

E.g 2000-2500rpm up a hill in 3rd with 1/4 throttle input.

What's been done/checked:

I have T'd in to the BOV line for the boost controller.

At full boost/throttle there is no signs of missfire so I assume coils are ok, I put new sparkies in about 3000km ago.

I'm hoping the tune will fix this up - could the O2 sensor be causing this? I think it would still be in closed loop at these times.

Anybody had issues like this? The PFC was tuned for stock turbo, R34SMIC and 10psi.

Side notes:

Boost seems to be raised about 0.5-1psi and the stock AFM is maxing out quite a bit earlier. Feels a bit less responsive though

Also running no snorkel on the airbox and you get some wired noises...

Edited June 3, 2007 by benl1981

[cheez]

by not running the snorkel all your air box is doing is sucking down hot air that the engine gives off. if its missing down low that could be a coil issue, but b4 u fiddle with anything, get the tune done and get teh tuner to do a diagnose on the engine.

[benl1981]

anyone. It drives ok but definately more of a miss now..

[TTT]

cleaned your afm?

[benl1981]

Should give it a go I guess.

Idles fine and on full throttle it's fine so I sort of discounted that.

I

[STATUS]

replace spark plugs.

[benl1981]

I did that 2-3k kms ago. The problem was evident with new sparkies. It is worse now since FMIC went on.

Cheers

[STATUS]

sorry missed that line

go in for your tune, a responsible tuner will tell you str8 up if it has issues or not. Within 5mins they should be able to tell if it is electrical or a tune issue.