Boost Surge On My 25

[TAKUSHI]

any one experienced what im getting?

k now ive just recently wound my boost up to 11psi and when im pushing my car from down low, it hits 11psi

and if my rpm is below 4k its like it cuts out and comes back to life very quickly, almost like you're giving the

clutch a good ol poke, as soon as the rpm is above 4k it holds 11psi fine and doesnt miss a beat, now its already

got split fires, but im almost wondering if the fuel pump or injectors arent delivering enough fuel.

im still running factory injectors and sadly the ceffys na auto rb20e fuel pump, boss tells me fuel pump will still

deliver required fuel pressure so im unsure, im picking up an 040 soon so i guess ill find out.

the one thing that is making me reconsider that its a fuel prob is that my old factory rb20 skyline held 14psi no

probs and never let me down, i mean that felt like it had more poke than my 25

any one shed any light on my problem

cheers

nath

[toffy]

sounds like a tune problem mate , i wouldn't be relying on the fuel pump either . vct hooked up properly?

[TAKUSHI]

yeah it is, i mean the car takes 9psi lovely, takes 10 even better but if i squeeze the throttle and make 11 too early, and the ghost has pushed my clutch pedal

theres no tune on the car, and my only mods are 3" tbe, front mount, manual boost cont, splitfires and a pod

mmmm indeed aye

[TAKUSHI]

mmmm ive heard that standard coil packs fail under higher than 10psi boost, now its not a constant prob, its only every 2-3secs under full load under 4k rpm

i forgot ive only got 5 splitfires and one standard coil

[Ultimategtr]

Hey man, i think im in the same boat or the one next to it. I think its my actuator. ill try changing it soon. its kinda like a mini surge aye, then hits you with full power again. I dont think itl be fuel related as it pulls hard to the redline, its just that tiny lil surge.

[Az_StrYdeR]

Sounds like R&R to me. Are you both running standard computers???

[TAKUSHI]

yeah im still runnin standard ecu but like i said, my 32 handled 14psi easy and that was all standard in terms of ecu, injectors etc, as for the surge itself, it feels like im stabbin the clutch every couple of secs till i hit anything over 4k, mysterys, gota love'm aye

[TiTAN]

you say 10psi and you don't get the issue 11psi and you do?

i would say the ECU is going into R&R. back the boost off to 10psi and your problem is gone.

[Az_StrYdeR]

^ +1 or get a PowerFC

You might have been running 14 psi in your R32, but 14 psi on an RB20 turbo is different than 14 psi on an RB25 turbo. (I realise that you are only putting it to 11psi and this is happening, just making the point that they are not equal volumes and therefore not comparable)

It has nothing to do with your injectors or any of the other stuff, its the standard ecu seeing too much air going into the engine, and retarding the timing (R&R= Rich and Retarded)

I've had this, its like it just drops into a lull, and then surges once you get over 4-4.5k.

[TAKUSHI]

haha ah i got ya now, yeah ill just drop it back to 10 for now, i got a gt35r going on later so ill need to upgrade comp and tune so ill wait till then to do that, cheers for the help fellas

[jay1]

bump

[Az_StrYdeR]

bump?? its been explained. if you need more information, what dont you understand?

[nIsMo86]

Lol @ the bump...