Increased Boost And Odd Problems :s

[Coupe-This]

Hey guys, i recently installed new plugs, about a month ago, anyways, i got plugs with a .8 gap, im pretty sure they are anyways. i dont wanna pull em out to find out really :s, alot of mucking around esp if i find out they are .8

Anyways, i set my boost for 9.5psi pretty much.

anyways, when i floor it, the car seems to jolt n jerk a little bit. Then it will come onto power. Weird.

Just wondering if this is the ecu doing this, fuel pump, or plugs?

which is the most obvious reason?

am thinking about getting a remapped r32 ecu put in for the time being.

What are the costs in tuning one of these for an r33?

The car has an r34 gtt intercooler, cat back exhaust and k&n panel filter. Stock dump and stock cat

Edited October 29, 2005 by Coupe-This

[R33S2]

stock dump pipe restricting flow is my guess (it was with mine but also fuel pump not keeping up) and you should get it tuned, if it leans out too much it could detonate.

[R31Nismoid]

could be fuel pump.

dont bother getting a re-mapped 32 ECU though. waste of the $$$

[Coupe-This]

hehe okie, wont do the r32 ecu, just save up for pfc. As for fuel pump i thought about this, and i made a thread bout wot fuel pump, as i think the bosch 040 has problems with letting the tank under a qtr. prefer a pump that i can take down a lil lower than that

[R33S2]

I used a walbro and Ive been down to empty mark but not past it.

[benl1981]

Could be coils but I think it may be the std ECU seeing too much airflow. I found this when running 9-10psi and R34 intercooler. Actually the R34 intercooler is what sort of set it off. I think at the same boost the air flow is a bit higher. Also the ramp up in airflow is what the stock ecu sees s a problem and richens up the mixture and retards the timing. I thought it was coils but it wasn't. The powerfc with even just the base map runs a lot better - no hesitation now.

It would be good if you could borrow a mates PFC to see if it helps.

If found asyou rev out sometimes it would start going really slowly from 5k rpm on - in 4th gear a couple of times up[ a hill I hit what felt more severe than a rev limit...this was at 3.5k as boost came on. Feels really severe as if you have broken something and instantly take your foot off accelerator

If your after cheap fix then get a SAFC or jaycar fuel adjuster but the PFC is much better.

Edited October 30, 2005 by benl1981

[Links]

If it's coming fully on boost and hesitating it's usually due to Rich and Retard.. turn down the boost a bit until it stops doing it than run it from there until you can get a power fc or something like that..

[Coupe-This]

yeah it was running rich, cld smell abit of fuel when hammering it, just weird, seeing as its only on lowish boost and already getting that problem, damn it. Mite have to invest in a pfc when i get back from my holiday :s, good old c/c, lol

[Links]

I had my car on about the same boost level as you last weekend on the way to avoca.. if I 3/4 throttled it so that it was about 8psi it'd gun it, as soon as I went full throttle 10psi it'd rich and retard, wouldn't accelerate till it settled down or I backed off the throttle..

It's a protection mechanism for the ECU, you could try maybe a SAFCII - not sure if this would make a difference..

[Coupe-This]

thats what i was confused about, because it would act stupidly then go fine, although if i backed off from full throttle to about 3/4 like u said, it seemed like it picked up a bit of power, haha damn cars. Might have to invest in a power fc one of these days

[benl1981]

Yes - I would find on 1/2 throttle my car would be quicker - especially running 10psi boost. Powerfc has fixed this..hoping to gain some more average power after a tune.

The stock computer is crap for anything above stock boost. Unlike other cars that are ok if you turn up the boost a bit.

[Sheriff Wan]

Get it looked at by a tuner. Cos if its your pump your playing with fire, if it leans out too much it'll cost$$$.

Id also look at timing as suggested. But realls get someone who knows what theyr doing before the damage is done.