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Just Fitted Justjap Fmic - Missing Now!

benl1981

By benl1981,
in Engines & Forced Induction

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benl1981 Grand Master

benl1981

Posted
Posted (edited)

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 :thumbsup:

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

Edited by benl1981
cheez Mentor

cheez

Posted
Posted

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.

STATUS Grand Master

STATUS

Posted
Posted

sorry missed that line :thumbsup:

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.

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