Boost Problems!!!

[Nickg]

Hey all i just installed a turbo-xs high performance manual boost controller into a R33 GTS-T (AUTO). as stock it was found to be at 4.5-5psi, now we boosted it to points between 6-11 psi and at high revs it was backfiring real bad, more backfiring when at higher boost like at 9-11psi. what the hell is the problem, is it that the computer is adjusting to higher boost? or do i need to reset my computer? or something else??? I have air filter pod, blitz dd blow off valve and a 2 1/4 all the way back with a 3 inch exhuast. the car did not used to back fire like this before hand, only sometimes when dropping from "D" to "2" at approx 75kmh.Help would be much appreciated as i need to fix this prob asap.

Thanks All.

[TTT]

should have done a search in the forced induction section on the word "MISFIRE" and you would have found that every R33 gets this.

the resolution is to take your spark plugs out, get a gapping tool and regap the spark plugs to 0.8mm (I am almost certain that your stock spark plugs woul dbe about 1.1mm)

Once you have done this, you will not have any more misfire problems with the new boost.

I have one other question though..

A standard R33 GTST runs 7psi as standard.. why was yours only on 5psi?

Are you judging the boost levels from the STOCK in dash boost guage or do you have an aftermarket one.

I ask this because of 2 things..

1.) the stock boost guage does not read in PSI.. it is in HG or something

2.) the stock boost guage is not VERY acurate at all.

If you haven't already done so, I would buy an aftermarket boost guage.. Even Autometer is fine if you are on a budget..

Until you have an aftermarket boost guage, I would take the boost controller off and leave the car's boost stock until you can modifiy it properly..

ALSO, it would be best if you installed and adjusted the boost pressure in COLD weather.

If you do it in the heat and you set it to 12psi, at night time, with the colder air, you will over boost to like 13-14 psi and MAYBE damage your turbo..

[strutto]

I have one other question though..

A standard R33 GTST runs 7psi as standard.. why was yours only on 5psi?

Stock 33 GTS25t's use a 5 psi wastegate actuator... The 7 psi is only achieved when the factory boost solenoid is opened... This is controlled by the ECU. If the solenoid is busted, unplugged or the ECU decides not to ground the circuit for any reason, you'll only get 5psi...

[jager]

had the same prob r33 gts-t when i got it only had like 4-5 psi

fixed the plumbing on theboost controller and she works sweet now

had an intercooler fitted boosting like 11-13psi and 186rwkw

question i put 13psi on hold to like first sometimes second and then backs

off to like 11psi holding that all the way? is that my stock BOV making the prob

or stock dump pipe? or am i totally looking the wrong way?