Topic: Supercharger Question

[AvieUp]

Hi, I am new to this forum and have a question that may have already been answered but i have searched over the course of the past few weeks and found nothing to help me. I want to supercharge my truck as the title states, but every supercharger i look at says not usable with flew fuel vehicles. Now i never use flex fuel and if i had known it would have been an issue in the MOD world i would have stayed clear from it, but now i find myself in this position. So my question is can you supercharge a Flex fuel or even do any sort of true power adder mod or have i bitten the bullet on a truck that needs to stay stock?

[MonstaMonsta]

What year Avy do you have?  any additional specifications you can provide us with would help I assume.

[oHIobellboy]

What year Avy do you have?  any additional specifications you can provide us with would help I assume.

It says 05 under his avatar. That is the first year they used the Flex Fuel engines in these.

I can't answer your question but there are a few on here that are FI. IF, it isn't possible then you may be able to find a donor engine and build it up before you drop it in.

[MyBigToy]

The basic reason they say you can't use a supercharger on a flex fuel vehicle is because of the additional fuel required because of the alcohol (lower gas mileage, burning more fuel). This simply means you have to have a larger injector to safely run E85 in a supercharged engine, and the flex fuel vehicles already have a larger set of injectors versus the non-flex fuel vehicles because of this. You should not run E85 on a supercharged setup tuned for 93 octane fuel; you should have separate tunes for each fuel.

I've never worked out the details but I suspect you would need 60 lb. injectors to run E85 and I'd say you would probably be close to maxing them out. Most of the supercharger setups supply 42 lb. injectors so you would not have enough injector capacity for E85. Those of us who have upgraded to smaller pulleys, larger cams, etc. are close on 42 lb. injectors.

As long as you never plan to run E85 you can buy a regular supercharger setup of your choice.

[MyBigToy]

One more thing occurred to me. I'm not sure how the pcm programming in the flex fuel vehicles works; there may be separate tables to compensate for each separate fuel (most of the GM truck pcms already have high octane/low octane timing tables to compensate for high/low octane gasoline). If that's the case, you could probably get away with running both as long as you have enough injector capacity.

[oHIobellboy]

   If you're not doing anything on Labor Day weekend. Come on down to the St. Louis area and check out a couple of FI trucks 
http://www.chevyavalancheclub.com/index.php/topic,13278.0.html

[AvieUp]

Yeah its a 2005 z71. And yeah I wasn't sure about the computer thing as well. Like possibly couldn't run a supercharger due to different programming. It would make my day a lot better though if it was as simple as don't ever use e85. I don't like it anyway sry but a reduction of 7 mpg ain't worth the 20cents saving at the pump lol.