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Tonyrodz
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Running good--so far. I've just been running it around the neighborhood--just in case.
Tonyrodz's Tahoe Build Thread
- Thread starter Tonyrodz
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Tonyrodz
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Idk. Should it be active? I haven't messed with it.
Dantheman1540
Full Access Member
Absolutely! power enrichment (aka PE) is used to richen the fuel mixture under heavy throttle to keep the cylinders cool and from blowing up. Typically your engine will target 14.7AFR (AKA stoich) but when PE kicks in which is typically throttle position dependant it will richen to whatever it is set at I would assume around 12.5 for your motor. Let me see if I can get a snap of the table.
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Tonyrodz
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I'll activate it right now.
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Tonyrodz
Resident Resident
It won't let me do it.
Dantheman1540
Full Access Member
That could be the problem all along! not enough fuel at WOT.
This table is what tells the truck to enter PE, I have mine set so that it only enters PE with near full throttle at lower RPM but as the RPM increases I want the truck to stay cool and prevent knock so it enters PE with just 35% TPS.
Dantheman1540
Full Access Member
It may only be an option in the tune write itself IDK anything about tech 2s
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Tonyrodz
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Probably right. The tuner did suk ass.
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Tonyrodz
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randeez
Full Access Member
i think inactive just means that youre not driving in a situation where pe is required (active)
Scottydoggs
Full Access Member
PE is only active when you have it floored some of these trucks are set to a few seconds of delay and min of 90% throttle. in the tune you can change what tp% you enter pe mode. i set mine to 30%. stock was 90%. with your tune who knows if he made them settings lower and took off the delay.
if you can scan commanded air fuel ratio when you floor it it should drop to 12's vs 14.7 idle and normal driving. the commanded afr changing is the pe is doing its thing. so if commanded drops when you go wot the pe is working.
if you can scan commanded air fuel ratio when you floor it it should drop to 12's vs 14.7 idle and normal driving. the commanded afr changing is the pe is doing its thing. so if commanded drops when you go wot the pe is working.
George B
¯\_(ツ)_/¯
Getting some great help here now! This is great!
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Tonyrodz
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Tonyrodz
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Tonyrodz
Resident Resident
14.6-1
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Tonyrodz
Resident Resident
Says inactive, but commanded state is on.....?
Scottydoggs
Full Access Member
this pic shows the afr commanded and the wide band bottom row left bottom box. higher up you see rpm, speed, o2 sensor in mv tp%, gear, ect, ect. important part is the afr from the wb matching the commanded. this is from when i was tuning my 3800 with blower and meth injection. its almost spot on for what my goals were. 11.4 commanded and actual 11.4 on the wb. it needed a bit more tweaking form here, then the timing got turned up.
https://photos.app.goo.gl/HfgkCpWLEGJzDzDS9
https://photos.app.goo.gl/HfgkCpWLEGJzDzDS9
Scottydoggs
Full Access Member
thats normal. now drive it and go wot and see if that drops to mid 12's
Scottydoggs
Full Access Member
decel is when your coasting off the gas. it turns of the fuel as to not waste it. messing with that is how you get the snap crackle pop tune working when yo down shift, works best on a manual car tho lol
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Tonyrodz
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I'll have to try it later, thx for all the help guys. I think when it comes down to it--it needs to be tuned by someone who knows what the hell they're doing! Black Bear Performance!!!
