R34 Boost Problem

[ZERO]

hey guys

i have recently boosted up my r34 but when it starts to hit around 4-5RPM it laggs

like the coils are gone... bbut they cant be cause i have just bought new coil packs from Nengun....

so whats the problem? is there a boost cut or something...

something wrong with my VVT?

[nuffsaid]

What boost are you running?

If its 11psi or more, Id say you are probably hitting rich and retard.

What do you mean it lags? does the power feel flat? or is it popping and jerking a little?

[17SOK]

What other mods are you running?

It's long shot... but maybe your exhaust/cat won't cope with the extra boost pressure?

I just put a decent exhaust on my 34 and the flat spot I had, seems to have gone

[ZERO]

it stays flat. has its little jerk and then goes again but up high rpm around 6-7 you cant feel much.

i have front mount, 3 inch all the way, filter and BOV

i have a full exhaust with a shit tip from japan which came with the car.... its like an oval shape one.. pretty quiet not like a cannon..

like a stock GTR exhaust with a 4inch tip....

[ZERO]

nuffsaid - you have PM

[nuffsaid]

ZERO, sounds like you might have a slightly restrictive muffler, sounds like maybe a nissan factory upgrade one.

[Abo Bob]

Sounds like the rich and retard thing.

Check out this old dyno sheet of mine. The lower line is no boost controller turned on, full exhaust, stock cooler. The upper line is 12psi of boost. See the dip in the power? It was very noticeable on the street.

[nuffsaid]

So 34's make close to 12psi just with a full exhaust?

[Green_s13]

the other thing to look at would be your fuel pump

[Alien]

I dont get it.... Adam... you got only 100 RWKW on stock boost?! how is that possible?!?! and only ~150rwkw on 18-19 PSI?

I used to run around 12PSI on that pheunamatical mehcnaical boost controller from SidMark on a stock exhaust and EManage. Was I restricting the power?

[Abo Bob]

A few people have hit R&R without a boost controller but I installed one in the above example.

darko - ???!!!?!?!! wtf? Have a closer look.

[ZERO]

yeah thats it...

same as you abo bob....

thats how i feel but you can feel it bigtime on the streets....

heard it was rich too... but man i cant see from the rear mirror....

so if i was to boost my car to 12psi cooler full exhaust filter...

how much you think i can push?

or how much does everyone else push?

Edited May 18, 2006 by ZERO

[Abo Bob]

auto or manual?

[Alien]

A few people have hit R&R without a boost controller but I installed one in the above example.

darko - ???!!!?!?!! wtf? Have a closer look.

oh oops haha

my bad

was that while u were running everything stock?

[ZERO]

manual

[choyda]

I had this issue. ECU or lowering the boost is the way to go I'm told if you're hitting the R&R spot.