Here's my idea.......

I was thinking about running a fifth up stream about 6in down from the TB in the IC pipe. It would come on similar to meth injection driven by injector duty cycle. This way I could run smaller primaries as well as have the cooling effect from the ethanol earlier.

This project is still a while out, Im gather parts for the complete build, and I have a lot fabricating to do, just wanted to through the idea other and see if anyone else has done something like this??

The end result is a 35R, running as much boost as I can get out of it . The car currently has a BR stage 3 Block and Head, but all stock bolt ons, it was stripped to sell it....... Im going to convert hopefully this week to e85 if I can pick up my injectors and just test tune and learn about e85 with the stock bolt ons while I build and buy the other parts......

Background, why Im thinking about this:
I have post on here about a project I worked on in college and continue to work on (Its actually a formula SAE racecar if any off you on here are formula junkies) where we used e85 on a 250cc 4cyl motorcycle engine out of Japan. It is turbo, running between 10 to 15psi of boost on a 11:1compression motor. We were very successful with this and ended making a little over 72hp with a single 20mm restrictor, out of a motor that normally makes 43hp with individual throttle bodies. Because ethanol’s has the cooling properties it does, we did not use an intercooler to save weight and really there was just no room for it. The problem we had was with injector sizing. We wanted of course enough flow to run 10 to 15psi of boost, but also we need part throttle response as well. With the proper size injectors for top end peak load, we couldnt go small enough in pulse-width to idle. We added a 5th injector in the intercooler pipe upstream of the plenum (about 8in) which turned on we the car transitioned into boost. It worked really well for us, and would actually cool enough in the low boost range to make the intercooler pipes sweat.........

 

Sounds like a good idea. Some problems you may encounter are boost leak around the injector. And how to secure the injector to the ic pipe. Also you may get different ammounts of the 5th injector fuel in different cylinders due to flow in the intake manifold (ie, the furthest cylinder will probably not get as much as the closest cylinder). The extra cooling with the 35R will come in handy! Good luck.

 

Thanks for the feed back. Im going to mount it the same style as the primary injectors on the intake, and use the same seals, so I think that should take care of the leaking issues.

I was a little concerend with the equal fuel amount, but if I have it up stream of the TB about 6 to 8 inches I think it should be mixed fairly well with the air.

 

Yeah, the further back it is, the better the pre-mixing it will be. I'd like to see a sweating UICP hah! Changing the temp in of the intake charge that much may result in a pressure drop, but with a 35R, you can easily make it back up

 

Oh yeah...... with the e85 it wont sweat during high load, and high boost, but we do have some methanol cars that will sweat during boost and have a slight frost at idle......its incredible to see.....

 

What will you use to drive the injector?

 

I was thinking of comming up with something similar to the Aquamist conrtoller or talking with you or tephra and see if there was anyway to do something like this through the stock ecu? even a digital out would work, but I need a flow sensor or something for a fail safe.....

I would tap fuel out of the fuel line so I maynot really need as much fail safe as the meth kits do.....

Really all I need is a digital out from the ECU that I can set to come on at specified value, aka injector duty cycle, MAP pressure, something like that.... if it had another injector driver that would be best, but Im pretty sure the stock computer only has 4 injector drivers......

 

if your sticking to the stock ecu there are digital outs, or you could set it based on fuel pressure...like a raising rate FMU, but if i was gunna go 35R and i had a built block and head id run a AMS VSR with there twin fuel rails, then just run 2 sets of 4 small injectors, and run an EMS to control the other 4....or you could just run a seperate injector driver