Chevyguy358

iTrader: (4)

I have a 383 lt1 that I've had tuned for both E85 and also 93 octane, well I decided to do a t56 conversion on it and decided to pull the motor at the same time to upgrade the cam. Curious how far off my tune will be and if i'll have to get it dyno tuned again, which becomes very expensive. The builds are the same just different cams. thanks

Previous cam:
.544/.555 (with 1.6rrs)
230/236 duration
112 LSA

New cam:
.600/.600
240/240 duration
108 LSA

Chevyguy358

iTrader: (4)

anyone??

BLK02WS6

iTrader: (2)

I would retune it with a cam change... maybe the place you had it tuned at before would cut you a break since you are coming back to them.

Gh0st

iTrader: (3)

Definitely retune. We don't have all of these fancy parameters in the ECM for nothing

Schwanke Engines

iTrader: (1)

You will need a retune especially for idle and off idle. It will make a world of difference. You added a lot of overlap and it will probably not be very driveable the way it is.

Chevyguy358

iTrader: (4)

yea it just kinda sucks that I only got 900 miles out of the last tune before my tranny gave out, and the dyno tune was $550. lol

Mike454SS

iTrader: (4)

What size injectors do you run with E85?

Chevyguy358

iTrader: (4)

I've got 37lbs injectors with an adjustable fuel reg, and a 115lph pump