Rogue_Ant

Hrm - it depends on the tune. But if your getting 6mpg, then Ceteris paribus, I would say 4-4.5mpg.


-Rogue

333pg333

Hey if he's only getting 6mph I say to quit racing!

Rogue_Ant

LOL - yeah, guess I need to fix that

v8killer

At what level does the head need to O-ringed on E85?

Rogue_Ant

Sid has ran mid 30psi without O-ringing... It really depends on your application, IMO.
If it is a track-car that is going to live @25psi, then I would O-ring it.

v8killer

Would 20-21psi be considered safe for the head gasket to live on a track car on E85? Right now I am running a Lindsey 340rwhp kit with a 60-1 hifi turbo @18lbs on pump gas.

It appears I need to change my injectors from 55lb. to 83lb., upgrade my fuel pump to a Bosch (044), and a good tune if I want achieve 400rwhp @ 20-21lbs. of boost.

Rogue_Ant

As long as your HG is in good shape, and you have a decent tune, then you should be fine.

blown 944

That sounds like a good plan. I would re-iterate what Josh said and if you don't know when the last HG was done I would replace it. They deteriorate between cylinders and become weak. If bad enough, the fire ring can slide out under pressure and then you may cause some additional damage. Best to just have a new HG on IMO, to be sure you know what you have to work with.

v8killer

My head gasket is a Cometic MLS last December after a Lindsey 2.5L rebuild with:

Decked block
Wossner Pistons
Wossner Rods
Cross drilled crank
Windage port blocked
Piston squirters
Baffled pan

It seems the only thing holding me back from cranking up the boost to 25+psi would be my head gasket. I am thinking that for the track 20-21psi would be a conservative amount of boost and my head gasket would live on E85? Could I even go a little higher then 21psi.?

blown 944

I don't think the HG is holding you back at all.

IMO for the track you would want to have a large IC and oil cooler and then you should be able to run it pretty hard. I would just have a knock monitoring system and creep up on the boost.

Sounds like a great ride.

Also another outside the box option is to plumb in a small nozzle to inject E85 (controlled with a boost referenced soleniod) into the intact tract post IC. (I mean in addition to having the injectors to support E85). I have found that it does a very nice job of colling down hot air. This is kind of like methanol injection but using fuel from the rail so you don't have to have all the other junk under the hood or refilling the tank.

Just thinking here outloud about some of the ways I have done things

Edit; I think your turbo will be out of it's range for any extended period at above 20psi. = Hot air.

V2Rocket

do you just tap off the end of the rail where the cap normally goes?

blown 944

you can using the proper fitting. I have one that has a tapped hole fo r a gauge as well.

Here is a map of the turbo referenced above at 22 psi

http://www.squirrelpf.com/turbocalc/...&product_id=62

333pg333

I'll be interested in your experiences on the track at higher boost levels. When do you think you'll be back there?

Rogue_Ant

+1

v8killer

I am in Phoenix AZ so I will not be tracking my car until October. Hopefully I will have my E85 conversion done by then. Is there anyone that does 951 E85 conversions in Phoenix or at least tunes for the E85? I will definitely post my results.