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-   -   Correct injector for E85 (https://ecomodder.com/forum/showthread.php/correct-injector-e85-3869.html)

metro094 07-17-2008 12:51 PM

Correct injector for E85
 
Hi. I have a 94 metro xfi and would like to convert to E85. I need to find some compatible throttle body injectors I can use to get the right mixture. Later, I plan to increase compression with new pistons, but for now will work with stock engine.

Can somebody help with this?

tjts1 07-17-2008 05:16 PM

If you are going to run E85 exclusively, you want injectors about 30% larger than stock. If you plan to use either E85 or straight gasoline some tuning will be required.

dremd 07-17-2008 05:47 PM

Also check that your fuel lines are compatible with E-85.

In theory your pump must be E-85 rated as well, but I "THINK" most pumps work just fine with E-85.

dcb 07-17-2008 06:07 PM

I can envision a $10 circuit (per individually fired injector) that would lengthen an injector pulse by 30% at the flip of a switch. If I were more of an ethanol fan I'd run off and try it.

metro094 07-17-2008 07:13 PM

As far as extending the pulse width goes, I think there are reasons to not have the duration of the pulse too long. Likely it would be fine, but I thought it would just be easier to have an injector with sufficient capacity.

I have heard estimates anywhere from 15% to 50% increase, but are all throttle body injectors alike and interchangeable? I need to know how to find one that will fit. Can I pull one off an old cavalier or corsica? I don't think I can go to the junk yard or the parts store and say I want an injector with 30% higher flow rate.

I'm aware of the lines issue, and will check that no rubber is in the line. Does anyone know if I will have enough fuel pressure and volume, or will I need a supplemental pump and new regulator?

dremd 07-17-2008 07:17 PM

I have never worked on TBI, but I can tell you that 95% of port injectors fall in to 2 categories Top Feed or side feed.

metro094 07-17-2008 07:57 PM

So do they mount and connect the same? Even different brands? Would something off a 1.8 or 2.0 liter engine be suitable? Any recommendations? I thought Bosch, ND, Delco, etc. would all have unique mounting and connection harnesses. If they are the same, that would make life easier.

tjts1 07-18-2008 01:23 AM

All fuel injected vehicles after 1990 have fuel lines compatible with E10 and therefore E85. The quick and dirty way to check is pull a bit of fuel like off a similar car at the JY and store it in a jar full of E85 for a month or so.

Rower4VT 07-19-2008 08:19 PM

Instead of messing with the injectors or pulse-width, just increase the fuel pressure. My stock pressure was 36 and at 65psi I can run E85 with no issues. Do not go above 65psi however as that is the generally accepted upper limit for injectors.

In terms of tanks and fuel pumps, you shouldn't have to do anything. I converted a '94 Acura Vigor with 200K miles on it. Been running E85 for a year with no problems.

dremd 07-20-2008 01:27 AM

Quote:

Originally Posted by Rower4VT (Post 45637)
Instead of messing with the injectors or pulse-width, just increase the fuel pressure. My stock pressure was 36 and at 65psi I can run E85 with no issues. Do not go above 65psi however as that is the generally accepted upper limit for injectors.

In terms of tanks and fuel pumps, you shouldn't have to do anything. I converted a '94 Acura Vigor with 200K miles on it. Been running E85 for a year with no problems.

2 things
1) TBI runs at very low pressure (like 10psi.
2) Injectors do hit a wall on running higher pressures, some more than others.


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