Weird Boost Problem Last Night

[ryan101]

i'll start with the mods first

r32 with rb25det series 2

full 3inch exhaust

fmic

hi/low boost control 7 and 10 psi

the problem is only when i put it on hi boost, when i put my foot down hard its like its pauses and stops boosting untill i lift my foot abit then it keeps going again?

I think its a coil pack problem?

cheers

[TRB-001]

its abit hard to go off without a full detailed description, as in....

what speed are u going when it happens, wot gear are u in

goes it miss and run rough (or studder) or is it simply not boosting

is it only cold nights?

it could be coilpacks, it could be spark plugs (or spark plug gap), u could have a boost leak, u could have a tps problem.... there is also alot more things it may be.....

go for another drive and mentally record exactly wot it does, at wot rpm, and wot throttle percentage, and exactly how the engine is running and abit more help....

otherwise check u have good fuel, u dont have air leak in the intercooler piping and maybe remove ur spark plugs and coilpacks and look for cracks or incorrect gaps

[ryan101]

Cheers mate, I will go for a drive later and check all those things! One thing I do know it didn't run rough it just paused then I lifted my foot then it started boosting again

as soon as it paused I lifted my foot, I didn't give it a chance to miss and muck around!

[ryan101]

It was cold lastnite, I havnt driven on hi boost on a cold night before!

[SiR_RB]

common rb25 ecu flat spot...get an ecu to fix the prob

[ryan101]

I'm thinken nistune, in a few months! Would new coil packs help? What are coil packs worth? Are the yellow jacket ones on eBay any good?

[3LGODZILA]

wats it actualy doing? sounds like either boost cut or missfiring.

when my coilpacks were missing i noticed popping and a loss of power under full throttle

when i was hitting boost cut it ran fine and boosted fine but as it got to like 14psi a massive loss of power felt like everything just shut down then when boost dropped the car came back alive. ecu shouldnt hit boost cut at 10psi but ur boost gauge may be out or something.

ive had both yellow jackets and splitfires. both did exactly the same job. i originally bought the yellow jackets but a few weeks later i claimed splitfires for free on my used car warranty. yellow jackets/JJR/superspark are all china copies of splitfires so most of the time they'll do the same thing but u might get unlucky and get 1 faulty one or something like that. and also splitfires have been proven to run for many years without problems as for the china copies they've only been on the market for a few years so who knows how long they'll last.

[ryan101]

It's kinda like I hit a wall, it's 10Psi I have a dyno run which has boost pressure on it!

[gotRICE?]

Its probly RnR. Seeing it was very cold.

AFM maxxing out.

[ryan101]

I didn't think r&r would happen at 10 psi?

All the info I'm getting is most appretiated!

Could be rite the air was dencer lastnite

[Thelen]

Acronym RnR RR R&R is what exactly? :S

[gotRICE?]

Rich and Retard

[ryan101]

i took it for a spirited drive today, and didn't miss a beat! i can only put it down to being cold and the air is more dence?

[gotRICE?]

Id say so.

Mine was doing it a little bit the other morning driving for a tune. Really cold morning.

[ryan101]

I'd love to sort this out! Any ideas?

[gotRICE?]

Ditching the stock AFM.

Running an aftermarket ECU.

[ryan101]

do you mean getting a Z32 afm? i do plan on getting nistune in the near future

[ryan101]

What is the max for the stock AFM? on 10psi i have 185.9rwkw?

[3LGODZILA]

yea same thing was happening after i got my safc tuned, only happened on cold nights. i just gave it like 90% throttle when it was real cold otherwise just turn the boost down a smidgen.

but if ur keen to do it properly and spend a bit of coin get a z32 afm and an ecu, i personally would just turn the boost down unless you were planning on getting an ecu anyways.

ive heard you can tune past the standard afm but apparently its not recommended. dont quote me on this but ur better off mentioning it to ur tuner getting his opinion

[ryan101]

fair enough, thanks i will have a word with him!

i think i will upgrade to afm when i get nistune done