E-85 a/f
#6
Evolved Member
iTrader: (125)
you would have to try pretty hard to melt valves using e-85.
I have seen EGT around 680C at WOT at 12/1 A/F
I have seen EGT around 720C at WOT at 12.9 A/F
I am truly amazed at low EGT from E85. I read EGT drops about 200C from gas. I wouldnt have believed it with out seeing it myself. I would say it runs 100-150C cooler than gas.
low EGT = happy engine
I have seen EGT around 680C at WOT at 12/1 A/F
I have seen EGT around 720C at WOT at 12.9 A/F
I am truly amazed at low EGT from E85. I read EGT drops about 200C from gas. I wouldnt have believed it with out seeing it myself. I would say it runs 100-150C cooler than gas.
low EGT = happy engine
#7
Account Disabled
iTrader: (465)
you would have to try pretty hard to melt valves using e-85.
I have seen EGT around 680C at WOT at 12/1 A/F
I have seen EGT around 720C at WOT at 12.9 A/F
I am truly amazed at low EGT from E85. I read EGT drops about 200C from gas. I wouldnt have believed it with out seeing it myself. I would say it runs 100-150C cooler than gas.
low EGT = happy engine
I have seen EGT around 680C at WOT at 12/1 A/F
I have seen EGT around 720C at WOT at 12.9 A/F
I am truly amazed at low EGT from E85. I read EGT drops about 200C from gas. I wouldnt have believed it with out seeing it myself. I would say it runs 100-150C cooler than gas.
low EGT = happy engine
Try another probe because I do not believe yours is accurate or you have it in an area downstream that is cooler than an inch or so from the exhaust port.
We have tons of datalogs of EGT and know that exceeding 900*C is not very difficult and it does not take an extremely lean mixture to achieve it.
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#8
Evolved Member
iTrader: (125)
Its TRE fast acting probe (zeitronics) . its in the middle of longest runner of evo 10 mani. reads about 75 lower than typical install ( 2 inch from head). direct back to back switch from 93 to e85 yielded ~125 cooler EGT. if you are getting same EGT as gas one of us is doing something wrong. if its me than I have higher power to look forward to.
also just some part throttle observations. tune lean for gas mileage. same car same setup.
93 octane cruised at 750c. 16.5 A/F
E85 cruises at 640C. 18 A/F
I am have always tuned with EGT. very helpful in my experience.
also just some part throttle observations. tune lean for gas mileage. same car same setup.
93 octane cruised at 750c. 16.5 A/F
E85 cruises at 640C. 18 A/F
I am have always tuned with EGT. very helpful in my experience.
Last edited by 94AWDcoupe; Aug 31, 2009 at 09:31 AM.
#11
Evolved Member
iTrader: (8)
It depends on Ethanol content as to how lean u can get away with... More Ethanol content the leaner you can run it. I try to shoot for around 12.0 to mid 12s with the E85 we get around here. Some have to run it 12.0 to higher 11s... But if I try and run the E85 we get in this area in the mid 11s then I cant get away from false knock as it will knock like mad on a stock ECU until i lean it out some "12.0-12.5" and then it picks up quite a bit of power and will accept timing advance! I have tuned MANY MANY EVOs from AEM to stock ECU setups. I have been tuning with E85 for id say the better part of a year day in and day out on my car and others.... and you basically just have to go off what the car is telling you as theres really no set in stone answer here. But 12.0 i would say is the middle of the road. I hope this helps some...
#12
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you would have to try pretty hard to melt valves using e-85.
I have seen EGT around 680C at WOT at 12/1 A/F
I have seen EGT around 720C at WOT at 12.9 A/F
I am truly amazed at low EGT from E85. I read EGT drops about 200C from gas. I wouldnt have believed it with out seeing it myself. I would say it runs 100-150C cooler than gas.
low EGT = happy engine
I have seen EGT around 680C at WOT at 12/1 A/F
I have seen EGT around 720C at WOT at 12.9 A/F
I am truly amazed at low EGT from E85. I read EGT drops about 200C from gas. I wouldnt have believed it with out seeing it myself. I would say it runs 100-150C cooler than gas.
low EGT = happy engine
E85 produces lower EGT's, I've seen it for over a year with E85 in multiple uses (track, street, drag)
I can imagine if I just had data from one shop car that just recently switched to E85, it might be biased one way or the other.
- Bryan
#13
Account Disabled
iTrader: (465)
Unlike some others, we actually have datalogs proving our information to back up our fingers at the keyboard.
We have data from multiple Evo's supporting our information, as always.
We are also aware that 94AWDCoupe runs 10's AFR which is why his EGT is so cold.
We have data from multiple Evo's supporting our information, as always.
We are also aware that 94AWDCoupe runs 10's AFR which is why his EGT is so cold.
Last edited by TTP Engineering; Sep 1, 2009 at 11:07 AM.
#15
EvoM Guru
iTrader: (50)
It depends on Ethanol content as to how lean u can get away with... More Ethanol content the leaner you can run it. I try to shoot for around 12.0 to mid 12s with the E85 we get around here. Some have to run it 12.0 to higher 11s... But if I try and run the E85 we get in this area in the mid 11s then I cant get away from false knock as it will knock like mad on a stock ECU until i lean it out some "12.0-12.5" and then it picks up quite a bit of power and will accept timing advance! I have tuned MANY MANY EVOs from AEM to stock ECU setups. I have been tuning with E85 for id say the better part of a year day in and day out on my car and others.... and you basically just have to go off what the car is telling you as theres really no set in stone answer here. But 12.0 i would say is the middle of the road. I hope this helps some...
94AWDCoupe's post indicatesthe EGTs were obtained with AFRs of either 12.0:1 or 12.9:1.
Last edited by mrfred; Sep 1, 2009 at 11:22 AM.