Skyline Running Badly (help)

[AZZA]

can anyone help me. I have bought a manual boost controller and once i put it on things were going fine, i set it around 10psi to 11psi on stock turbo and stock intercoller. However after a few weeks it started to loose power under boost at the high end of the boost range, about 5000 to 6500, sometimes even earlier. It almost sounds like it is backfiring. I have thought about air/fuel mixtures and the timing or that it may just need a simple tune. However i feel that there is a biger problem behind this, so if there is anyone out there with suggestions that would help, i would be greatfull

[The Mafia]

you need to gap your plugs..

I think its 0.8mm or 0.08 inch or something like that

do a search.

This will fix your problem.

Edited October 19, 2005 by The Mafia

[GKTECH]

My boost controller got disconnected when I installed my car alarm and it was just boosting and boosting, when it hit boost and was almost at the end of the gear (hitting max boost) it would back fire and almost sound like it was hitting the rev limiter. I realised that the boost controller wasn't working, got it to work again and never had the problem. I think I was hitting the boost limiter from the ECU.

Check to make sure your boost controller is working.

Greg

[soon2b33]

i have this exact problem, thought i had another boost leak.

at around 5000rpm onwards Sometimes it just eases off for no reason. very annoying when racing people as u watch them pull away (on the track)

i had brand new platinum plugs put in 3 months ago

[paulr33]

sounds like stock boost cut, time for safc or remap

[soon2b33]

sounds like stock boost cut, time for safc or remap

<{POST_SNAPBACK}>

would a dyno tune help? its an intermittant problem. was bleeding obvious last night when an identical skyline pulled away.

hope to get a safc or powerfc quite a bit further down the track.

[The Mafia]

I said it before and I'll say it again, higer boost puts out the fire...

gap your plugs

[SAUmember888]

Sorry but how do I change the plugs gap?

[AZZA]

tanks for the info guys, but i have to ask the same as SAUmember888, how dp you gap the plugs, can you do it yorself or is it something best left for the mechanic.

[SLIPPERY]

do it yourself

theres a tutorial in the FAQ section on how to remove your plugs

once theyre out, grab a feeler gauge and the plugs only require a little force to decrease their gap to the set level on the feeler guage

then pop them back in

easy as!

[R33S2]

Get the plugs out of the motor and when you look at it there is a little bent piece that sits over another rod in the plug, the gap between these two pieces is your plug gap, where the spark is created, now get a feeler gauge that is 0.8mm thick and if it doesnt fit between the two widen the gap till it does, it MUST be a close fit so you feel it contact with both sides. Look at the plugs and consider thier condition if the rod bit is flat on top with sharp edge around its in good condition.

[AZZA]

I was talking to a mate of mine and he said that it may be because it is not getting enough fuel, is it possible that a fuel pump could fix this or is it deffinatly the plugs. Just eant to make shore in case i stuff something up.

[The Mafia]

I was talking to a mate of mine and he said that it may be because it is not getting enough fuel, is it possible that a fuel pump could fix this or is it deffinatly the plugs.  Just eant to make shore in case i stuff something up.

<{POST_SNAPBACK}>

heheh everyone always thinks they aren't getting enough fuel. Ever wondered why your car blows black smoke under load?

Its because the stock ECU runs rich as f**k.

Dude, as soon as you increase the boost, there is more air in the cylinder, causing there to be more resistance between the plug gaps, causing them to miss fire.

Before you touch your fuel pump, or anything else, GAP YOUR PLUGS.

Its the easiest, and first thing you should do. This is a VERY well known thing with the RB25det, and any other forced induction car.

You need to GAP YOUR PLUGS.

Do it first, THEN look at other things.

[SAUmember888]

Thanks for the info guys...really appreciated! yur all the best!