fuel or induction problem?

[pnoy]

I notice that every time I hit around 4000 - 4500 rpm it feels like the engine would stall for a fraction of a second then gain its power back. It started last month and now it's more frequent. My buddy was thinking it could be my stock fuel pump which switches from 6 volts to 12 volts on wide open throttle. I rather avoid going to the dyno until I can get bigger injectors and clutch replaced.

I running on stock clutch for about 4 months now at 5 - 6 psi and I know it's starting to wear out and I got yellow GT-S injectors.

[kisar123]

It happens on my car too, running 10 PSI.

If felt like the boost was cut for a fraction of a second then the boost came on again.

Can anybody help us?

[pnoy]

I don't think mine is related to boost. I don't see boost leak on my monitor coz it stays at .46 until I let go of the gas or hold it.

[pnoy]

It happens on my car too, running 10 PSI.

If felt like the boost was cut for a fraction of a second then the boost came on again.

Can anybody help us?


You're problem is related to tuning. Got that A/F ratio graph printed out from your tuner? If not then I suggest checking it out to see if you are running lean, rich, or ideal. Ideal A/F ratio should stay between 11 - 12

[kisar123]

Yah I got my A/f print out.

Here's the link for the pic http://putfile.com/pic.php?pic=10/30319223671.jpg&s=x11

Sorry the numbers kinda small.

What do you think?

Thanx

[pnoy]

it's not consistent. You're running ok at 4.3 then rich on 5.4

[kisar123]

The shop told me that he tuned it richer after about 5500rpm because of the timing.

So what's the next step should I do?

Btw, have you figure out your problems?