Would I run into back pressure issues by switching to E85
Would I run into back pressure issues by switching to E85 Ok so this is what's going on.. I wanna make the switch to E85 but I'm not sure if I'll run into backpresure issues with the turbo current turbo I'm running. My setup is ur typical stock rotating assembly lq4 317's heads custom cam by Martin.... Car is currently on 91 pump gas with 100% meth(2 nozzles) the car ran a 9.6x 137mph at 3720lbs Fbody the turbo is a Tnetics 88mm and has a 75mm turbine wheel... The car made 760rwhp and 780rwtq on 16lbs... Now will the car run into backpresure issues if I switch over to e85? I'm thinking more fuel with E85 with small turbine wheel will cause issues? Any advice would be helpful thanks!!!
your back pressure will not change at the same psi. but once you turn it up I'm sure b.p. will rise. but that being true you will be safer on e85 if you do get higher back pressure. no to mention you can add timing for power not boost with the octaine
. I made the switch from pump to e85 and love it the tuning window is larger and you just don't have to worry about octaine any more.
once the afr is dialed in your car should run a tenth or two faster then add a degree of timing and get a couple more.
made the swich this year and I don't regret it at all.
. I made the switch from pump to e85 and love it the tuning window is larger and you just don't have to worry about octaine any more.
once the afr is dialed in your car should run a tenth or two faster then add a degree of timing and get a couple more.
made the swich this year and I don't regret it at all.
Ok I see... The reason for switching over to e85 is to be more reliable as far as fuel wise... Maybe like mention above add a lil bit of timing safely with the e85 vs pump/meth I'm not trying to get the highest hp numbers out there just wanna go faster but hopefully not run into backpresure issues by the way the turbo is for sale to.. Will trade for a nice s480
I would recommend finding a way to test the actual ethanol concentration in your "E85". In some areas it varies wildly. The sellers don't see a problem with this, as they expect it to be used in flexfuel vehicles anyway. That being said, with a reliable source it makes great race fuel.
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backpressure will be determined by the amount of air you are pushing thru the turbine and in this case that is going to be the same volume as the engine is the same but the egt temp will make a bit of difference depending if the temps are higher.
all that being said I think the benefits of e85 out weigh the downfalls of it . I have only been running it a year but cant see me going back . eather way build them and have fun.
all that being said I think the benefits of e85 out weigh the downfalls of it . I have only been running it a year but cant see me going back . eather way build them and have fun.
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The actual exhaust density will be greater with E85 due to 35+% more fuel volume going into the chamber than you had on pump gas, and your BP should increase to some extent depending on how hard you are pushing it.
I have not done an A to B backpressure test, but my setup spooled a bit better on E85.
Try it and see!
You can't think of exhaust flow on a turbo setup like a simple air flow model.
The exhaust flow characteristics will vary considerably based on boost, engine rpm, turbo rpm, afr's, ignition and cam timing, egt's, fuel type, etc.
An extreme example is how methanol fueled cars can spool HUGE turbos despite having much lower EGT's than a gasoline vehicle.
Pressure has a much greater effect on turbo spool up than heat alone.
Think of how banging the 2-step builds boost on the line much more effectively than using lean AFR's and no timing with high EGT's.
I have not done an A to B backpressure test, but my setup spooled a bit better on E85.
Try it and see!
You can't think of exhaust flow on a turbo setup like a simple air flow model.
The exhaust flow characteristics will vary considerably based on boost, engine rpm, turbo rpm, afr's, ignition and cam timing, egt's, fuel type, etc.
An extreme example is how methanol fueled cars can spool HUGE turbos despite having much lower EGT's than a gasoline vehicle.
Pressure has a much greater effect on turbo spool up than heat alone.
Think of how banging the 2-step builds boost on the line much more effectively than using lean AFR's and no timing with high EGT's.