Boosting, Misfires And Pops

[ZiAzon]

Okay guys, Just got myself a Turbosmart Boost Tee and upped the boost on a stock R33 GTST Sedan to about 10psi. It then started misfiring so I went out and got myself some NGK coppers 0.8mm put them in and then went for a run, at first I ran at 7psi, no misfires runs fine some popping of exhaust. then 8psi, no misfires runs fine and no popping of exhaust...., then 9psi no misfires runs really well no exhaust popping, and then 10 psi, misfire galore... and popping exhaust galore.... I checked the coil packs when they were out, and there seemed to be no hairline fractures I could see.... THen again I didn't them examine using a microscope but with my eyes, they seemed fine, gave them a give wipe down and sprayed out the boot area.

So what seems to be the problem? anyone?

[Cadmoon]

Old coilpacks, mine does exactly what yours is 10psi and starts misfiring at high revs. They may not look cracked but they are still 17+ years old.

[Kane_R32]

+1 Coils. If it's fine off boost at 10psi until full throttle this will usually indicate old coils just not being able to provide a strong spark

[ZiAzon]

Okay sweet, this will justify splitfires

[Frosty]

Okay sweet, this will justify splitfires

splitfires are ok but save your self a little cash and get the yellow jackets! out performed my splitfires and almost half the price

[GTSBoy]

Opposite result from most other people.

[Daza33]

My car had yellow jackets in it when I bought it, after 3 months they shat themselves. Put splitfires in it and no worries since

[B-Boi34]

+1 for splitfires, fixed all my misfiring issues.

[Dose Pipe Sutututu]

Totes agreed, I have 5 yellow jackets and 1 new looking OEM coilpack. I wonder why for a while, then realised they might have died and the previous owner dropped in an OEM coilpack.

Car now is starting to develop a slight misfire on days at 0.8bar, I'm blaming those ling long coilpacks

[Frosty]

Opposite result from most other people.

maybe a good batch?

im running splitfires now but going to ex them and run coils i think..

[paulr33]

please tell me you arent running stock ecu?

your probably hitting the stock rich and retard if its still the stock ecu

its also likely your coilpacks are dying on boost which is pretty common

but before you go and shell out for coilpacks check what ecu you are using

you cant just crank up the boost and hope it will work on the stock ecu

[GTSBoy]

please tell me you arent running stock ecu?

your probably hitting the stock rich and retard if its still the stock ecu

its also likely your coilpacks are dying on boost which is pretty common

but before you go and shell out for coilpacks check what ecu you are using

you cant just crank up the boost and hope it will work on the stock ecu

We weren't going to mention R&R to this guy. Pops and misfires are different anyway. Once he had bought new coils and managed to get it to run at 10 psi without misfiring but started wondering why it was blowing black smoke and going slower than before.....THEN we would have told him about R&R.

[ZiAzon]

Yea I have realised it's running R&R, going to get an ECU before I up the boost more. It's actually running quite nicely on 9psi at the moment, no problems, not even black smoke or sluggish. But before I do anything I need to deal with a speeding fine that should be coming round anytime now... Hopefully it wont hit hard...