Thread: Testing E85. Do you?

Originally Posted by GTPpower

On a wideband calibrated for gas, yes that's what it would have read in closed loop.

I'm not asking theory, you stated you tried it, I'm asking for the results. Because some gauges are strictly going off of lambda and converting to afr, so if it was showing 14.7 with nothing but e85 that means it worked.

Hmm. I wonder why my stock tune for a 200 GTP with a return style fuel system sloped with manifold vacuum.

There are a couple theory's behind that.

-Gm didnt wire the car with heavy enough fuel pump wiring so they compensate for the weak pump in the tune (I don't honestly see this one considering people regularly add 50+ horsepower without the pump sagging)
-The bosch regulator isnt perfectly linear

I have tried sloped and flat line with my setup. Much better results with it flatlined *shrugs*

Originally Posted by 91parkave

I'm not asking theory, you stated you tried it, I'm asking for the results. Because some gauges are strictly going off of lambda and converting to afr, so if it was showing 14.7 with nothing but e85 that means it worked.

It's not a theory. My wideband was calibrated for e85 when I was experimenting with this. So once in closed loop, it runs at 1.0. Cold startup, warm startup, cranking, etc is where the problem was.

Originally Posted by Frosty

There are a couple theory's behind that.

-Gm didnt wire the car with heavy enough fuel pump wiring so they compensate for the weak pump in the tune (I don't honestly see this one considering people regularly add 50+ horsepower without the pump sagging)
-The bosch regulator isnt perfectly linear

Cool. Thanks for the insight.

Originally Posted by Frosty

I have tried sloped and flat line with my setup. Much better results with it flatlined *shrugs*

LOL

Originally Posted by selliott

Thanks just ordered mine

Great! Be sure to post your results.