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converting L67 to E85

A few things.

I have a 97 grand prix that I converted to E85... I was able go from stock horsepower to around 300whp without doing ANY mods but putting a smaller pulley on and changing the injectors.

If you put 42# injectors in, you will not have to tune for E85 at all, which is handy, and the stock tune works GREAT with E85. You can also push the limits of those 42# injectors to about 310whp on a stock tune and stock fuel pressure... You could try to up the fuel pressure a bit when you do your fuel system if you wanted to stretch them... its usually easier than tuning for guys that dont have easy access to tuning options.

You could then upgrade from there, and 60# injectors would be needed, as well as tuning being a good idea at that point.
 


darkhorizon said:
A few things.

I have a 97 grand prix that I converted to E85... I was able go from stock horsepower to around 300whp without doing ANY mods but putting a smaller pulley on and changing the injectors.

If you put 42# injectors in, you will not have to tune for E85 at all, which is handy, and the stock tune works GREAT with E85. You can also push the limits of those 42# injectors to about 310whp on a stock tune and stock fuel pressure... You could try to up the fuel pressure a bit when you do your fuel system if you wanted to stretch them... its usually easier than tuning for guys that dont have easy access to tuning options.

You could then upgrade from there, and 60# injectors would be needed, as well as tuning being a good idea at that point.
Click to expand...

Was that with the 3.2 SC pulley? If you were able to run a 3.2 without issues, I feel like I should be able to go smaller than my current 3.1 with the mods I have
 
darkhorizon said:
I had a 3.2 laying around but it should be easy to see a 3.0 or smaller on there.
Click to expand...

aside from the mystery KR I see at part throttle on occassion under medium loads, my setup handles the 3.1 without issues up through WOT. Maybe I should drop down to a 3.0 and see how it responds
 
darkhorizon said:
A few things.

I have a 97 grand prix that I converted to E85... I was able go from stock horsepower to around 300whp without doing ANY mods but putting a smaller pulley on and changing the injectors.

If you put 42# injectors in, you will not have to tune for E85 at all, which is handy, and the stock tune works GREAT with E85. You can also push the limits of those 42# injectors to about 310whp on a stock tune and stock fuel pressure... You could try to up the fuel pressure a bit when you do your fuel system if you wanted to stretch them... its usually easier than tuning for guys that dont have easy access to tuning options.

You could then upgrade from there, and 60# injectors would be needed, as well as tuning being a good idea at that point.
Click to expand...


Thats impressive! im getting my brothers old gtp (97) in the next week or two, and ive been trying to figure out the first stage of mods, it looks like this is the way to go! 250 for injectors, and a high flow fuel pump, maybe cai and headers, seriously big gains!
 
Shouldn't need that fuel pump yet. I'd just rewire the pump and call it a day for now! The other mods sound spot on for some serious fun :)
 


97AutoXVette said:
Shouldn't need that fuel pump yet. I'd just rewire the pump and call it a day for now! The other mods sound spot on for some serious fun :)
Click to expand...

what sort of pulley should i expect to be able to run on the stock pump with those mods? im guessing a good 50wHp?
 


Hmmm Ok still a bit curious lol. I have a 3.4 setup and I'm wondering after e85 how low can I go? What should I be expecting?
 


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