1g ecu questions.
I'm going to list my vehicle specs first. Explain my problem, than ask my questions.
1991 Eagle Talon TSI -6 bolt block bored .020 over. -6 bolt oversized oem pistons and rings. -6 bolt crank n big rods. -6 bolt head milled 0.015 stock valve-train/cams. -Deck surface was machined to 0. -Felpro Perma Torque -ARP head studs -BSE kit. Oil port mods were made to the head and the front case mod. I did not do the OFH port mod. My oil pressure is way better than it was before the rebuild. -FMIC 2.5" pipe -1g hard pipe intake from stock 1g maf to stock 14b turbo. -stock 450's -Full 3" turbo back. -All new oem timing components and gates timing belt. -Hallman MBC turned all the way negative. -EGR is deleted. -stock 1g ecu. -1g bov recirculated. -I came up with a static compression ratio of around 8.85:1. Thats not 100% but I know its gotta be really close. -I'm pretty sure i have every boost and vacuum leak taken care of. I will double check again. ---PROBLEM--- The problem I'm having is i get a maf code 12 or 14. I cant remember exactly but its a maf code. MAF worked before rebuild on my 100% stock engine with mbc fmic. but i cant say its a good maf because it has not been tested. Maybe it went bad when i stored it. I can reset the ecu idle and rev up to 3k before CEL comes back on. I'm running rich in boost. I have a spike going into boost. about 14-15psi before it dips back down to 10-12 I think this is because my mbcs vacuum source is off a throttle body port? Thats alot of pipe to fill before it hits the throttle body. Questions -Can the 1g ecu handle all my mods without being tuned? -Do you think my spike problem is a boost leak, vacuum leak, or the way my mbc is ran? -Is the spike causing me to run rich after boost levels out because of the way the ecu works? Could it be a tip in closed loop open loop thingy? I'm just learning about all this ecm stuff so if that sounds stupid I'm sorry. I need to do more research in this area -Could any of my problems be something to do with the over bore and the engine pumping more air. What would this cause the ecu to do? -Could this be tuned out with a data-logger and adjusting the cas since i don't plan to run over stock boost or modify the car anymore, if it was still running rich after i fix the boost spike? -If someone could point me in the right direction that would be great. I'll add to this as i have more questions or thoughts about it. |
Re: 1g ecu questions.
Swap MAF's and see if it goes away. Were you having any of the other issues before the MAF started throwing codes?
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Re: 1g ecu questions.
gotta start somewhere.
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Re: 1g ecu questions.
With the factory MAF, you shouldn't be running into problems with those mods. I'd swap out the maf for a different one.
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Re: 1g ecu questions.
If you're running a stock 1g maf, i have another you can test quick to rule that out as the issue.
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