Problem during full throttle boosting
- Thread starter got_psi?
- Start date
WhiteWarrenGee
Driver
Boost controller in limp mode?
had the same problem on my ka and it was a valve that was getting stuck open at 4k
BiG MiKE
Driver
ur kidding right? I hope u mean to monitor it
wtf? How'd u figure that one out?
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Junglist Muzik
Member
start with buying a boost gauges.... from what you said it sounds like you dont have one. What pressure regulator are you running? You may be leaning the motor out therefore the motor stutters. Check timing and maybe get an AFC to tune a bit better
I do have a boost gauge installed. And the wastegate is T'd off of the vacuum line connected to the fuel pressure regulator and the manifold. Right now I'm running a NGK 5 series heat range plug because for some reason I've been unable to find a colder plug around town. More specifically the BKR-7e, so I'm waiting on a set I've ordered.
Boost leak, maybe tear/cut in IC couplers
Intake Manifold leaks? (*but this would be apparent even NOT under WOT)
BKR7E's gapped at .28 or .30?
Harness hacked or ?
It almost sounds like fuel pump or fuel related, but you said you had a walbro
I'm not sure if Acutator should be t-d from the FPR. try using the throttle body and check for cuts in vacuum lines.
Good luck with sourcing the problem. Keep us updated
Intake Manifold leaks? (*but this would be apparent even NOT under WOT)
BKR7E's gapped at .28 or .30?
Harness hacked or ?
It almost sounds like fuel pump or fuel related, but you said you had a walbro
I'm not sure if Acutator should be t-d from the FPR. try using the throttle body and check for cuts in vacuum lines.
Good luck with sourcing the problem. Keep us updated
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Why else would you have a fuel pressure gauge?!? Do you not monitor your fuel pressure on it? Check your fuel pressure at the rail while under boost to see if its within factory tolerances.
WhiteWarrenGee
Driver
Yeah I would put a gauge on the fuel line to check that walbro, those things can be hit and miss sometimes.
i pulled all my valves and one had the worst valve job ive ever seen... and it get stuck when i tried pulling it the rest of them slid right out
BiG MiKE
Driver
For one.. the plugs ur running are TOO HOT! Stop boostin wit those til u get the proper plugs! As for ur VAC lines... Get a nipple welded onto your hotpipe near the turbo for your wastegate actuator sourse - run a pretty nice sized line lets say 1/4" or 3/16" I.D. and ur BOV and FPR should have their own source without anything t'd off of them
Where would you suggess I connect the boost gauge line?
i had this problem. normal driving was fine. a/f rich as fuck.
2in gash in my i/c coupler that would open up under boost.
2in gash in my i/c coupler that would open up under boost.
BiG MiKE
Driver
Buy a vacuum Block - they are inexpensive and do the jizzob or if u have an aftermarket intake mani (Greddy or Replica) they have predrilled/tapped ports for extra vac's
Goodluck
i have a vacuum block for sale! pm me if u need it!
- big mikes correct on the plug. stock sr runs 6 for heat range. please get a boost guage to monitor ur setup.
i also say do a boost leak test--
http://forums.nicoclub.com/zerothread/158784
what fuel pump are u running?
what are u using for a fuel filter?
whats fuel pressure at when the break-ups happening?
check ur voltage on the battery while the cars under load. sr's are very picky with voltage.(check battery/alternator output.)
answer these questions and we can further help u. thanks
- big mikes correct on the plug. stock sr runs 6 for heat range. please get a boost guage to monitor ur setup.
i also say do a boost leak test--
http://forums.nicoclub.com/zerothread/158784
what fuel pump are u running?
what are u using for a fuel filter?
whats fuel pressure at when the break-ups happening?
check ur voltage on the battery while the cars under load. sr's are very picky with voltage.(check battery/alternator output.)
answer these questions and we can further help u. thanks