Help With R33 S1 Skyline Boost Loss

[RB25 SKYLINE]

hi guys i have a r33 s1 skyline with 145,000ks on the clock no leaks/problems at all,the car is great on fuel $75 to fill and i get 550ks out of a take easy and it doesnt smell fuelly only a bit wen its cold drives good at cruising speed in any gear but if u put ur foot down its like the car starts to go then u can feel it holding back not julting but just a constant hold back in boost???it seems to start around 3k revs and goes right though the rev range i have checked all vacuum hoses and fitted all hose new clamps it has a r34 side mount intercooler and the standard boost controller disconnected and a turbo smart boost tee fitted running 7psi boost.it has a 3.5" super cat exhaust with highflow cat.i have had the car for 4 months and the car was fine wen i bought it.to try and fix the problem i have also changed the afm,replaced the fuel pump with a standard 2nd hand fuel pump,iridium spark plugs gapped at 0.8mm r33 gtr coil packs.with these things changed there has been no improvement.if i hold my foot flat to the floor it just starts goin then the turbo keeps boosting but it just take ages for it to climb up the rev range and if i keep my foot down and punch it through the gears wen u back off the gas at anytime it backfires and caries on and sometimes at idle it it runs realy rough then if u give it a rev it sometimes fixes it but other times it does it for a while even after driving it for a bit .any suggestions on wat it could be or a ruff guess on a price for someone to have a look.im located at wyong on the central coast so if u have any suggestioins of mechanics/tuners that could help me out that would be great,cheers

[zebra]

Tl;dr

[RB25 SKYLINE]

????

[RB25 SKYLINE]

any help???

[wolverine]

When exactly did the symptoms start and what did you change or do to the car just before the symptoms started?

just a constant hold back in boost???

How are you measuring this?

[GTSBoy]

I don't think he means boost in psi so much as just not wanting to pull. ie, low power.

This could be anything at all. Bad fuel pump (which can include things like a poor earth, not just the pump itself), bad injector or injector connector, collapsed cat, blocked fuel filter, weak coil (although they usually make life a bit more miserable than your situation sounds), etc etc etc.

[cobbadan]

hi guys

I have an r33 s1 skyline with 145,000ks on the clock, no leaks/problems at all.

The car is great on fuel, $75 to fill and i get 550ks out of a tank easy and it doesn't smell fuelly, only a bit when its cold.

Drives good at cruising speed in any gear, but if u put ur foot down its like the car starts to go then u can feel it holding back, not julting, but just a constant hold back in boost???

It seems to start around 3k revs and goes right through the rev range, i have checked all vacuum hoses and fitted all new hose clamps, it has an r34 side mount intercooler, the standard boost controller disconnected and a turbo smart boost tee fitted running 7psi boost.

it has a 3.5" super cat exhaust with highflow cat. I have had the car for 4 months and the car was fine when i bought it. To try and fix the problem i have also changed the afm, replaced the fuel pump with a standard 2nd hand fuel pump, iridium spark plugs gapped at 0.8mm, r33 gtr coil packs.

With these things changed there has been no improvement. If i hold my foot flat to the floor it just starts going then the turbo keeps boosting but it just take ages for it to climb up the rev range and if i keep my foot down and punch it through the gears, when u back off the gas at anytime it backfires and carries on and sometimes at idle it runs really rough, then if u give it a rev, it sometimes fixes it but other times it does it for a while even after driving it for a bit .

Any suggestions on what it could be or a rough guess on a price for someone to have a look.

Im located at wyong on the central coast, so if u have any suggestioins of mechanics/tuners that could help me out that would be great

cheers

Sorry mate, im no help with your problem, but for some reason i felt compelled to modify your post.

FYI - big blocks of text like you have written, make me click the back button.

Have a quick glance at yours then a quick glance at the one above -- which one would you rather read ?

[RB25 SKYLINE]

thanks cobbadan im not much for punctuation.

its like gtsboy said every goes up as normal boost guage etc but it just has no pull.

it started doing it a week after i got it and i dont thrash it i just use it as my daily but after it started doing it i cleaned the pod filter and afm i used proper senser cleaner on the afm and it did improve cold starting.i also changed the fuel filter and fuel pump,spark plugs with iridiums and replaced the coil packs with r33 gtr coil packs.its been serviced regularly and drives great wen u drive it like a nanna.i was also thinking the problem may be injectors or fuel presure regulator?is there a way to test these?

[wolverine]

Still stock computer? Have you checked base timing? Has it been on a dyno (afr's, power level)?

Many other things to check other than less likely things like injectors and regulator.

[RB25 SKYLINE]

the computer is still stock,i havent checked base timing and not really sure how to on these.i havent had it dynoed cause i didnt know if they could do uch with a stock ecu??

[Room42]

Tl;dr

This^

And...you spent a whole lot of money fixing stuff that wasn't broken. Type in r and r into the search feature and see what you come up with.

[RB25 SKYLINE]

This^

And...you spent a whole lot of money fixing stuff that wasn't broken. Type in r and r into the search feature and see what you come up with.

wheres the part where i spent a whole lot of money??

it was due for a service so i put iridium plugs in it

i put new coil packs in cause i got them off a wreak that a mate had for free

hose clamps i got from work for free

fuel pump came off the same wreck for free

so all in all i havent spent much money at all which is the plan obviously so thats why i thought that i would ask for some advise and hopefully get me out of trouble without spending a whole lot of cash.

Edited November 7, 2011 by RB25 SKYLINE

[Stevoss]

rich and retard, or maxing out the afm, check timing (in the manual) and then go see dvs jez. hes on the coast.

[GTSBoy]

I have a hard time believing it's gone all the way to rich and retard only running 7psi.

[RB25 SKYLINE]

thanks stevoss i rang dvs jez and am goin to see him om on saturday to hopefully sort out this issue,hes the first person ive rang that was actually happy to chat for 5mins so fingers crossed my car will be back to normal again without spending to much coin.thanks for ya help and feedback guys cheers

[Bsa]

Do you have a exhaust leak before the turbo sounds stupid but my mates 33 did the same thing fixed the leak and all good. Is your intake stock might be sucking shut on boost

[Bsa]

Base timing should be 15 I'm fairly sure