E85 questions
Premium Supporting Vendor
Joined: Oct 2004
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From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
BMW also has wideband O2 sensors to adjust WOT fueling on the fly. GM does not.
Yes, BMW has electronic waste gates.. GM computers don't even have a way of controlling waste gates, much less making adjustments based on ethanol content.
Like I said.. BMW are far more advanced.
Yes, BMW has electronic waste gates.. GM computers don't even have a way of controlling waste gates, much less making adjustments based on ethanol content.
Like I said.. BMW are far more advanced.
Actually GM does control waste gates electronically and they can make adjustments based on ethanol content once the sensor is added and turned on in the ECM. Same as any flex fuel car from the factory.
The new V6 turbo's, Buick Regals and Caddy's too can increase boost via the ECM. I have tuned a handful of them.
I call those "hero tunes" because it's so easy to look like a hero.. A couple of computer strokes and you can increase boost by 3-5lbs in the mid range. They still run out up top though so it's mainly a TQ increase , but it's an easy 40-45 ft lbs and 20-25 HP.
They do need to add a WOT wide band though, that would be great.
Race Director
Joined: May 2004
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From: Raleigh, NC
St. Jude Donor '15
I didn't say they didn't have an ethanol input... I'm very familiar with that and am using it now with some custom stuff I've built (though not for E85 directly). I can vary ignition timing (and AFR if I wanted to) based on methanol system pressure.
I didn't know they had electronic control of waste gates.. that's pretty cool. Must be for some of the little 4 cylinder turbo'd cars or something?
I didn't know they had electronic control of waste gates.. that's pretty cool. Must be for some of the little 4 cylinder turbo'd cars or something?
Last edited by schpenxel; Nov 10, 2015 at 10:05 AM.
Premium Supporting Vendor
Joined: Oct 2004
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From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
I didn't say they didn't have an ethanol input... I'm very familiar with that and am using it now with some custom stuff I've built (though not for E85 directly). I can vary ignition timing (and AFR if I wanted to) based on methanol system pressure.
I didn't know they had electronic control of waste gates.. that's pretty cool. Must be for some of the little 4 cylinder turbo'd cars or something?
I didn't know they had electronic control of waste gates.. that's pretty cool. Must be for some of the little 4 cylinder turbo'd cars or something?
Sorry I misunderstood you on the Ethanol.
Melting Slicks
Joined: Jul 2011
Posts: 2,042
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From: NJ
Our E85 fuel system is $1,299, add the sensor and injectors if needed with your originals sold to offset, and it's still going to be less then the very bottom of your range there.
I do like the availability of increasing timing etc all on it's own, but you're right with just adding meth being far less expensive.
I do like the availability of increasing timing etc all on it's own, but you're right with just adding meth being far less expensive.
Thread Starter
Racer
Joined: Jun 2011
Posts: 294
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From: Charlotte NC
So that makes perfect sense now. I can just dump E85 in and the WOT wideband on the BMW will compensate. In the Vette it uses a table lookup at WOT that's why you have to tune for E85. Is that why some high power turbo guys use different ECU's?
From a Meth standpoint what are you tuning? My understanding its used to increase octane and cool the IAT. From a tune aspect does the tuner add more timing? or more fuel as well?
From a Meth standpoint what are you tuning? My understanding its used to increase octane and cool the IAT. From a tune aspect does the tuner add more timing? or more fuel as well?
Race Director
Joined: May 2004
Posts: 16,667
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From: Raleigh, NC
St. Jude Donor '15
Yes.. integrated widebands are a nice feature on aftermarket ECM's
Some don't.. some just spray a small amount of meth on top without changing a thing. Different strokes.. etc.
Last edited by schpenxel; Nov 10, 2015 at 10:57 AM.
