Spluttering After Exhaust Install

[ProphetR33]

Hey guys, I installed a Trust Power Extreme II system on my R33 today, now when I give it a squirt the engine chokes and splutters at 5,000rpm almost on the dot every time in any gear except for first. There is no loss of power except for a bit of hesitation when it splutters. Does anyone have any ideas what could be causing it.

My mods are only 3 inch dump/front pipe, 3inch hi flow cat, 80mm trust exhaust, pod filter and FMIC with the standard solenoid grounded.

I don't have an aftermarket ECU, so does this mean I'll be needing a tune or is it an injectors problem, sparks, coil packs or anything.... It's only happened since I installed the catback, it was fine with the dump and cat done previously.

Any ideas?

[tek_01]

coilpacks im guessing as they have a habit of missing at approx 4500rpm

[enzan]

Well I'd be looking at the coil packs first off. Very common problem, could just be a coincedence that it occured after fitting the exhaust. If the coil packs are the same as the 32's then I'd be pulling them out and checking all the carbon ends/springs. Mine did the same thing a while ago and I found the all the carbon ends had burnt out, replaced them all along with new spark plugs and the problem was fixed. The carbon ends sit on top of the spark plugs, if you pull the ends off the coils they are exposed and can be replaced easily enough. Not expensive either.

[AzzurrA]

I take it this is in an R33 GTST? do you have a boost gauge fitted? what boost is it now hitting with the free-er flowing exhaust and the intake mods?

maybe you're hitting the boost cut on the factory ECU (though unlikely if its not losing power)

[ProphetR33]

I take it this is in an R33 GTST? do you have a boost gauge fitted? what boost is it now hitting with the free-er flowing exhaust and the intake mods?

maybe you're hitting the boost cut on the factory ECU (though unlikely if its not losing power)

Yeah its a GTST.

Boost is hitting around 10 PSI. A boost controller should be arriving on monday, I thought that the boost may be spiking (I couldn't see it when I was driving but 10 PSI isn't far from 12 so it may be the case), but as you said, its probably not that if its not losing power. The boost controller should stop the spiking (if its there), then I'll look to see if its in fact the coilpacks.

Thanks for the suggestions guys. Hopefully its not the coilpacks, as my knowledge is pretty limited when it comes to ignition problems.

Edited March 24, 2007 by ProphetR33

[nizmo_freek]

What type of spark plugs are you using at the moment?? you need to be running a heat range 6 plug with a 0.8mm gap, ngk BCPR6ES is what im using at the moment and they are fine so far, my mods are hks silent power catback, decat pipe, fmic and solenoid grounding mod.

[ducki]

it happened to me when i first got my pe2 as well... change sparks to 0.8mm ngk.. and problem fixed.

[Rolls]

Bigger exhaust means an increase in boost, this means you need a better spark to ignite the mixture. If your coilpacks are shagged then it will cause the misfire, if you have a stock ECU with the extra boost its probably running very rich which also needs a better spark to ignite. A combination of a tune (new ECU, fuel piggyback), better spark plugs gapped to ~.6-8 (if standard coil packs) or .8-1 if you get some splitfires should cure the problem.

[Turbo Dave]

Mine is doing a similar thing too just seems to flaten out in power around 4000 to 5000 then it comes on strong from 5000 to 6000, would this most likely be the plugs or coilpacks???

[ProphetR33]

Not sure about which sparks I'm running at the moment, I'll crack it open and have a look when I get a chance.

Thanks for all the help guys its much appreciated, when my boost controller arrives I'll just run it on 7 PSI to be safe at the moment, then check the sparks on the weekend.