what would you prefer for a pro charged 383 lt1? its already tuned for 100 but i was thinkin about changin it to e85

 

Takes a larger volume of alcohol to make a given HP. Is your fuel system overbuilt enough to handle the needed volume? Do you have someone local willing to tune it?

 

well i still dont know what to do. im now considering just keeping the car how it is but as far as tuning, it does need tuned and i dont have anyone yet to tune it

 

Let's move this to "Forced Induction".

 

E85 would be waaaaaaay cheaper, you'll need like 30% more fuel flow though. Probably only bigger injectors and pump.

 

E85 blends are not consistant. Meaning if you get a new tune on one tank of E85, then fill up again, your tune could quite possibly now be off again. It may be cheap, but it is not consistant, and you will get worse mileage with it anyways, so the price won't really make up the difference. Not to mention you need to make sure your fuel systems (to include pumps, lines, seals, and injectors) are all E85 friendly.

I say stick with the 100 octane tune and setup you have now.

Or better yet, go with a meth injection setup. Meth is dirt cheap, and will allow you the same results running race gas will (lower IAT's to safely run more timing and boost).

I spent $12 on 5 gallons of methanol 3 years ago. I run a 50:50 water/meth mix. After quite a bit of railing done on the car, I still have 3 gallons of the water/meth mix left.

 

it does have a snow performance water meth kit on it already. would that be just fine with the 100 octane? im not really worried about price for gas cause its gonna be an every other weekend driver for the most part.

 

Just curious - Why do you need 100 octane? Most of the time you're driving around, you're not in boost, and when you are, you have the meth & water injection. Is it just to be safe in case you are in boost and the water injection fails? Do you have a high compression engine or stock pistons or something?

 

i bought the car and originally it was tuned for 100. i dont really know anything about the motor or anything but it wont be an everyday driver ill maybe drive it every once in a while or just to the track. but it really needs tuned cause it runs like crap. and no one near me has the kit to tune it.

 

You need to figure out what the specs are in the parts in the motor before a tuner is going to know blindly what you have internally (the specs on the cam for example). Then, you can bring someone good at tuning these cars like Bryan Herter from PCM's for less to get you all setup on whatever tune you want (like a track only tune on pump gas and Meth if you want).

 

Im not sure what differences there is in US but here in sweden there is aprox 85% etanol in the summer and 75% in the winter, since you can run E85 widh a lower lambda (richer) widhout loosing power it shouldn be a problem widh a +/- 10 change in the alcohol mix if its tuned right.

+/- 10 change in the alcohol is egual to +/- 0.035 on the lambda value.

E85 friendly, only problem i hered of is a dual intank pump setup were they had used some cheap hoses inside the tank that came lose.

Milage will be at least 35% worse and everything in the fuelsystem need to have capasity for 35% extra fuel so the stock fuellines will be good to 650-700 blown engine hp at least. (havent tried more)