sr20det breaking up at high rpms?

[jim1234664]

so just got my car back on the road 2 days ago. mods are:

t25 @ 14psi
fmic
3" turbo back
blitz bov venting to atmosphere
bc step 2 cams
arp studs / cosworth mls
walbro

Thing ran like a raped ape the first day I had it out, pulled hard to redline and felt really awesome.

fast forward to later on that night and at wot it runs like normal till about 4.5k then just gets real sluggish and pulls a little half assed then stops for a split second then pulls shitty for another have second and stops again rinse and repeat all the way to redline.

im thinking maybe boost leak under pressure? Its hard to remember because I only had it out for half a day but i believe it used to pull 19 in hg and now its around 17 at idle?

already checked all vaccuum lines, nothing blew off or anything, bov is sealed up tight, not really sure what other things the problem can be? plugs are bkr7e .028 with 100 miles on them, coilpacks are good as far as i know but i do have 4 spares i could throw on there if need be.

thanks everybody - jim

[SkyVision]

Mines doing a similar thing ran hard for like 2-3 weeks then one day it just fell flat on its face / Whats funny is that it runs hard in 1st & 2nd just 7psi but in 3rd and up it breaks up nasty!!!!!! / Already checked compression and i got 135psi on all cylinders for its age id say thats fine especially that they all even......... I only got 2 things on my mind that could be that i havn't check yet and that is boost leak or clogged fuel filter.....I plan to do a smoke test on my turbo piping to see........

[Dirtcanhurt089]

Try a smaller plug gap and see what happens

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[jr_ss]

Try turning your baby turbo down to a reasonable 10-12psi, anything over this is not worth the gains.

You also need to close your plug gap.

[Livinstrong]

What type of fuel/engine management are you running? Probably needs more fuel. Try bumping the boost down to a reasonable 10 and see how it pulls. Also, I wouldn't try boosting anymore with that T25, at 14 pounds it's basically blowing hot air.

[ultimateirving]

Mines doing a similar thing ran hard for like 2-3 weeks then one day it just fell flat on its face / Whats funny is that it runs hard in 1st & 2nd just 7psi but in 3rd and up it breaks up nasty!!!!!! / Already checked compression and i got 135psi on all cylinders for its age id say thats fine especially that they all even......... I only got 2 things on my mind that could be that i havn't check yet and that is boost leak or clogged fuel filter.....I plan to do a smoke test on my turbo piping to see........

What plug gap you have? It sounds like spark blow out. Also the coil packs could be failing. I had 1 that was shit and worked well enough to drive but once you got in it, started breaking up bad.