DCrosby

So I posted a thread about a month ago that I though I had issues with the ignition due to some stumbling at WOT, the thing is after inspecting the coils, replacing the sparkplugs, and finding a Airpump replay problem, it still didin't boost right.

It's non Seq. boosted 8 psi, but not untill 6k+ rpm.
Before that, it likes to sit at about 5 psi...

I added a boost controller to get it up to 10, it now runs 5-6psi from 2.5k - 6k and then starts creeping towards 10 Psi... sometimes 11psi (rare)

I have DP, Midpipe Muffler, Catback, streetport, VMount IC and stock twins non sequential.
New NGK Plugs.
I had the turbos taken appart, after I chipped an apex seal (during the rebuild) and the turbo survived, turbine blades were fine and not damaged. Bearings run, and it doesn't burn Oil or make noise, and it does eventually get 10 Psi... or whatever you ask the controller for.

So I'm stumped, the fuel pump got changed, so did the filter, and injectors during rebuild.

Yet somehow even when it gets to 10 Psi, it starts stumbeling again, like it's missfireing and or just not getting enough of something air or fuel or sparc....

And yes this is all still on the stock ECU, and I don't have creep since the wastegate got ported... when it was appart... the fear is if i get the AEM tuned for it it'll be a waste of money since it might be something mechanical, and I don't want to go get it tuned with issues, it should run well stock, then I need to get it tuned for 13-14psi....

Any Clues, Experiences, Hunches would be appreciated...

Thanks,

-DC

Snook

iTrader: (12)

get another leading coil and replace the wires make sure you have the coil harness on right (although your car would have blown up by now if not


maybe the stock ecu is retarding the timing so much because of the port that its causing the turbos to spool so late? Also how do you have it setup non seq? thats probably it right there one of the doors isnt open thats supposed to be or something.

dubulup

have you pulled any codes?

Fumanchu

I think it's something with your new IC. Take vmount off and give it to me.



Maybe we should get together soon and troubleshoot our boost problems.

rdavidsrx7

Yeah check the doors and flappers in and around the manifold and y pipe, and get a computer that is setup for this (shameless plug....xs reprog). You will be running lean on the stock computer and will probably hit the fuel cut real soon. Get a second gen coil if that is the problem, from what I have been reading they are better than the third gen coils are.
Good luck

Bob

rdavidsrx7

oops geuss you have an ems...hehe

P'cola FD

If you really want to see, take the turbos off, and check that the precontrol door is welded at about 90% open, the TCA door is either removed or wired all the way open, and that the waastegate actuator is operating properly. Also, look at the wastegate door. Make sure it wasn't overly ported. It is posible that the wastegate was opened too much, which would cause your symptoms.
What kind of boost controller did you get? You may just need to tune on it a little better.

DCrosby

The non seq. system was setup by a rotary mechanic, that has done a number of them, I doubt that he would make such a blatant mistake as to leave something not welded open... allthough a possibility, it's something I'd have to leave as a last resort, cause if it's not wrong, I wouldn't want to pay for him to pull it all appart again...

Ignition is fine, we used a timing light to see if the engine was missfireing, and checked the resistance of the coils.... fine... from what I understand is they don't go out that quick.... most last the lifetime of the car.. (11/12 years so far )

Also the boost controller is a mechanical one, and the boost gauge hasn't failed me... (Not Home Depot) Outer ring pulls up you twist and push the ring back down to set...

What really urks me is that @ anything over 8 PSI depending on throttle I get some wild bucking, this seems to also be related as to how warm the engine is, as in if I've been ideling at a light for a while it's much more severe than if i've been on the highway and I want to change lanes and grab a lower gear, and punch it.... The it's tough to tell in a car that's bucking and going 60+ wether the boost is fluctuating or it's your head that is moving back and forth....

I'm pretty confident that the bucking should be fixable once it's on the dyno (adjust fuel air & ignition)... but the boost not coming up to 10 psi, when on the highway @ 5krpm, once I stand on the throttle, for it to have to build up is rediculous... and won't get fixed with the ecu, since with the manual controller we've taken the ecu out of the picture, and fuel/spark cut wouldn't happen untill you're above 10 psi... or @ the rev limiter....

DCrosby

Sorry no codes from the ecu.... ecu is clean, and we did swap it with another '93 R1 and it does the same thing...