Stupid Problem Ruining My Fun

[missile_c33]

hi guys lookin for some help as im stumped

so the problem is I have built myself a simple little drift missile but the response is *weird*?
say I whip a couple of nuts then go to snake off as soon is I blip the gas off then hard back on it dies as if a total cut then comes back on perfect again but by then traction is gained and its all over. same thing winding out a gear and changing up, rev all the way (no tach yet) smash next gear.... biiiig dead spot , foot still firmly planted, one or two tiny ignitions then back on song no missing broad minded persontering nothing, ruining my skids,

so guess I shood drop a mod list

c33 laurel originally rd28 diesel manuel
c34 rb25de wired in like factory, knock sensors, acc valve valve everything works , even hooked up the start signal wire
stainless 3-1 extractors into 3" exhaust with 1 hi flow muffler
pod filter with cold air box, doesnt have a feed into it , is just blocked off from engine bay and taking air from behind the light etc
diesel flywheel p plate, clutch and gear box
fuel is a 30l fuel cell with surge tank, hi vol pump into tank and a vl rb30 efi pump to motor, still running factory flushed diesel hard lines, (small return) and using the fatory fuel pressure reg thing on the return, (I assume that's what it is)
plugs are iridims and gaped to.8

any help would be great, this makes it no fun to drive

[XGTRX]

Tune or Fuel reg. If it has one. Maybe a case of over fueling when you come off throttle.

Edited June 14, 2013 by XGTRX

[missile_c33]

running standard fuel reg and "fuel damper"? vl rb30 to much?

[XGTRX]

Not sure mate but a tune should be able to work it out. My old carby ap5 had the same problem and used to foul the plugs all the time until I sorted the over fueling with a fuel reg and carby jets. It was a petrol engine though. Diesels might be more sensitive to over fueling I think.

[missile_c33]

is a petrol rb25de now, im thinking over fueling is gonna be the prob as fuel pump is only thing different, fuel pressure for n/a rb25de?

[XGTRX]

The reg and tune then I think. Fuel pump shouldn't be a problem if the other 2 things are ok

[mad082]

Is the gearbox/neutral switch hooked up so it knows when it's in gear? I'm assuming by having the start switch hooked up you are meaning the neutral switch is earthed so it thinks it's in neutral all the time, which means it will be using a different map in the ecu than if it thought it was in gear. That may be contributing to the issue.

[missile_c33]

does sound like a good plan, however, everything in this car is stripped, the whole auto loom is now gone ( body is factory manuel) would it be a pinout from the ecu?

as for the start start switch as far as I am aware I had to put 12v to it when the motor is winding over starting and it tells the ecu to give it a little more gas?