E85 383 LT1 tuning
06-04-2008, 12:42 AM
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E85 383 LT1 tuning I recently installed a new 383 motor in my 94 z28 and am having a dyno tuning session next week. I have heard some great things about e85 tuning on high compression motors as its octane is around 104. i am running a 12:5:1 static, and 9:4:1 dynamic compression setup and contacted the guy that will be tuning my car, he seemed rather reluctant to tune to e85 with my setup, as he stated the lt1 computers don't allow for a great degree of parameter adjustment. Wondering if any of you familar with e85 tuning can comment or give me advice on whether you believe it can be done, I think my injectors may be on the small side but am not sure. Heres my setup:
383 with flat top pistons and 5.7 rods
around 9:4:1 DCR
cam specs 230/236 .544/.555 with 1.6 rrs
ported heads and intake
52mm TB
37 lb injectors
255 lph fuel pump
any help is greatly appreciated as i would really like to convert over
383 with flat top pistons and 5.7 rods
around 9:4:1 DCR
cam specs 230/236 .544/.555 with 1.6 rrs
ported heads and intake
52mm TB
37 lb injectors
255 lph fuel pump
any help is greatly appreciated as i would really like to convert over
06-09-2008, 04:55 PM
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I've read about E85 tuning but have yet to do one hands-on, myself, yet.
Basically, E85 requires a different air to fuel ratio - all else being equal, it needs to be richer then with unleaded gasoline. Because of this, injectors that are borderline too small for a gasoline setup will almost certainly be too small for E85.
I don't see any reason why the LT1 PCM cannot support E85 from a tuning perspective.
Basically, E85 requires a different air to fuel ratio - all else being equal, it needs to be richer then with unleaded gasoline. Because of this, injectors that are borderline too small for a gasoline setup will almost certainly be too small for E85.
I don't see any reason why the LT1 PCM cannot support E85 from a tuning perspective.
06-09-2008, 07:07 PM
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Tuning for E85 is easy, I did it with a Predator hand held tuner.
LT1 PCMs have PLENTY of adjustment for E85.
My guess is that a 383 LT1 with that size cam would need a larger injectors than 37lbs. If you search around there is a calculator that you can plug some numbers into that will tell you what size injectors you'll need.
LT1 PCMs have PLENTY of adjustment for E85.
My guess is that a 383 LT1 with that size cam would need a larger injectors than 37lbs. If you search around there is a calculator that you can plug some numbers into that will tell you what size injectors you'll need.
