[Gibbs]

Originally Posted by gabedude

It is running out of injector and going lean more than likely. Take it easy on it, get it comp checked and a leakdown and get it protuned.

The comp is good my engine was rebuilt at 2000k (****y stock map) and now has 7000k on it and the injectors are nowhere near making out

[tyler_sti]

Call me gib. I know exactly whats going on. This is gettin way to technical. If the car dosent have this problem when you first flash the map, it wouldnt make sense in a million years that it would be the injectors. Injectors dont just work when they want to. So that said, how would it be possible to have 2 different injector cycles? "it's the ecu learning with crappy cali gas" I think only 91 guys experience this. I plan on getting protuned VERY soon, to solve this minor problem.

[tyler_sti]

Originally Posted by White Devil

from what I understand when you go WOT it taxes your stock fuel pump and its not strong enough to pump that kinda fuel. So what ends up happening is the car starts to run lean.....real lean and next thing you know .....kapow. Trust espically with that cobb map get a fuel pump and as soon as you can get that POS cobb map off your car and have it protuned

To each their own

[Gibbs]

Originally Posted by tyler_sti

Call me gib. I know exactly whats going on. This is gettin way to technical. If the car dosent have this problem when you first flash the map, it wouldnt make sense in a million years that it would be the injectors. Injectors dont just work when they want to. So that said, how would it be possible to have 2 different injector cycles? "it's the ecu learning with crappy cali gas" I think only 91 guys experience this. I plan on getting protuned VERY soon, to solve this minor problem.

Im sitting in class right now I will call you in 20min or so

[CenCali07STI]

Originally Posted by tyler_sti

To each their own

Several tuners recommend running a walbro on a stage two 07 because of them needing to run more fuel to combat with the new head design. I am running one myself. Besides its cheap insurance only $100. Wolfplayer did a review on it and found that NO it does not lower injectory duty cycles but it does not have to work as hard to keep up with the fuel demand like the factory fuel pump does to keep the proper afr's at all times

[tyler_sti]

Wasnt implying one wasn't a good idea. Only implying one was not "needed" and not the "sole" source of the problem at hand.

[CenCali07STI]

Originally Posted by tyler_sti

Wasnt implying one wasn't a good idea. Only implying one was not "needed" and not the "sole" source of the problem at hand.

true may not be the main culprit but i would say on an 07 it is needed. just my .02 though. Mine was protuned the week i installed my exhaust and fuel pump because it ran horrible on the OTS cobb stage 2 91 oct map.

[Peleg]

FP, Protune.

[tyler_sti]

Yeah, my car runs "great". But not ideal, its a no brainer to put a fuel pump when getting a protune. Just to give that tunner the extra room to tune. cant wait for my protune!

[explor4u]

Hey! I am having the same issue with my 07 stg2 (Cobb 93 oct map). I ordered the tratrix cable and will datalog to see what the heck happens at that point 5500 rpm. I will get back and post the results. Oh, and I ordered a walbro fuel pump to install this weekend .

Up until now the car is running fine no smoke, no abnormal oil consumption and no weird engine noises. How would I tell, from the datalog, if the car has a bad cylinder or ringland without going to compression test? I know that is the way to go (comp test), but is there any parameter in the datalog that I should be aware to load it when doing the datalogging? BTW I will be using enginuity (romraider). Thanks guys!

[Loubaru]

Mine did this a while back when it was cold out up here. I'd like to think it isn't what gabe said... but it does kinda make sense because mine had never done this until it got really cold out (higher fueling demand).

Anyways... i haven't really beaten on my car much since then. I'm waiting until I get my bonus in a couple weeks so I can 1) get a comp/leakdown test, and 2) FINALY GET GO STG 2 AND GET TUNED SO MY CAR DRIVES LIKES ITS SUPPOSED TO!!! If you guys can't tell I'm pretty stoked to get my car running like it should.

[reddoak]

Any news? I would guess it's either maxing the injectors and running lean or it's got a bit a learned timing (for whatever reason) in that range.

Obviously, stop driving it like that until you figure it out. Ask Gabedude about maxing injectors out repeatedly and how that ends up.

As far as logging to find a bad ringland... maybe logging engine roughness? Better off just starting it up and taking off the oil fill cap. If it's smoking, get a compression test, but it's probably too late in that case. Check your oil often, like whenever you fill the gas. Most gas stations are level ground, and you've gotta wait anyway, right? If you start burning through oil noticeably quicker, get a compression test.

Mine had the same issues when stock (and with a Walbro 255), I logged IDC's over 100%. I went stage 2 with an XPT map to try to keep my car running a bit safer. My IDC% stays below 100% now, if I feel any hesitation, it's just good old fashioned knock, not some piston melting lean misfire disaster.