Mechanical Fuel Injection and Turbos

[spoolboy]

Anybody know anything about running mechanical fuel injection with a turbo?

I think I understand how the bypasses and jetting work to change fuel flow to match needs based on rpm, but how would you add fuel pressure based on boost? Do they make a rising rate regulator for those? And how would you get the fuel flow to increase at the correct rate? It seems like a rising rate would be too lean at boost onset, and too rich at full boost.

I've been on Kinsler's site as well as Hilborn's. Hilborn offers some "turbo parts" but I don't know what they do, though I suspect they are similar to rising rate regulators.

Anybody been there and done that? Blowers are cake, since boost is rpm dependent (so is the fuel pump output). Since turbos have different boost levels at the same rpm, depending on the gear the car is in..... things aren't as simple.

Since F1 used mechanical EFI and turbos at one time, there has to be a good answer.

I've been looking at Porsche's CIS system on the older turbo models too.

Anybody know anything?

Dennis

[altered7151]

Rising rate regulators it about all you have to deal with on the mechanical injection. A guy that used to race VW's with us was running a turbo on mechanical injection with very good results. You just have to be on your game with tuning. And your right when you say it might be lean at boost onset, so you have to run the low side a bit rich. Thats the problem with mechanical injection is you have to run it rich until boost comes on, then hope you have it set right for boost conditions. Much harder to get full potential out of a car, you need to have alot of experience with it, Thats why alot of the older guys think electronics are "cheating". What are you considering running mechanical injection on?

[89acclaim]

Reminds me of the old k-jetronic Mechanical fuel injection system. If I remember correctly one of the K-jetronic systems was used on a 2.2 pase car in 81. Here is some info on the system http://www.auto-solve.com/mech_inj.htm and here is some information on the car http://www.geocities.com/aaronkarpi/ppg.htm I hope this helps.

Daniel Merrill

[spoolboy]

Quote:

Originally Posted by altered7151 Rising rate regulators it about all you have to deal with on the mechanical injection. A guy that used to race VW's with us was running a turbo on mechanical injection with very good results. You just have to be on your game with tuning. And your right when you say it might be lean at boost onset, so you have to run the low side a bit rich. Thats the problem with mechanical injection is you have to run it rich until boost comes on, then hope you have it set right for boost conditions. Much harder to get full potential out of a car, you need to have alot of experience with it, Thats why alot of the older guys think electronics are "cheating". What are you considering running mechanical injection on?

I'm considering running it on our race car, sorta. Mainly just curious about it.

I have heard that sand-rails are sometimes setup this way.

So they DO use a rising rate regulator?

Dennis

[altered7151]

Quote:

Originally Posted by spoolboy I'm considering running it on our race car, sorta. Mainly just curious about it. I have heard that sand-rails are sometimes setup this way. So they DO use a rising rate regulator? Dennis

Yeah they do run a RRR, the guys I have dealt with anyways, there very well could be other means out there, just not that I know of.

[Mike Radowski]

Quote:

Originally Posted by 89acclaim Reminds me of the old k-jetronic Mechanical fuel injection system. If I remember correctly one of the K-jetronic systems was used on a 2.2 pase car in 81. Here is some info on the system http://www.auto-solve.com/mech_inj.htm and here is some information on the car http://www.geocities.com/aaronkarpi/ppg.htm I hope this helps. Daniel Merrill

funny you mention that since that car just came up for sale:

http://www.turbododge.com/forums/showthread.php?t=69728