Quote:
Originally Posted by Hammer
To get back on topic, Do you guys think building an engine from ground up to
run on E85 could run higher compression with turbos?
How about 10:1 compression with WRX 19T TD04HL turbos?
Do you think I could push 26 psi boost on a setup like that with E85
with its anti knock ability? This is getting close to a diesel turbo engine.
Put stage 3 heads on it to flow better it could be a wild street car.
Of course if it worked you would be in a world of hurt if one put 93 premium in it.
But my thought is to optimize the setup from the ground up to maximize E85
fuel for street use. Thoughts? AEM would be a must for something like this.
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Yes Hammer, I believe that you're moving in the right direction.
Now it's a known fact that on gas ultamately you can make more power with lower compression and higher boost, vs higher compression lower boost before running into the detonation barier. Methanol is the opposite. Due to it's extreem chilling and throught the roof octane, this is possible.
I'm still playing with E85 to get a really good comparison, but so far I'm leaning towards higher compression. In fact I'm doing another engine build right now with 12.5:1. The higher compression gives more power overall, better low end, and spools the turbos quicker, and you can use smaller turbos too.
As far as "what's possible" I don't konw for sure, but I can tell you what I've seen work so far. The DSM guys are taking stock blocks out of the mits expo (2.4L) and slapping their heads on them. The interesting thing is that the compression is ~13:1 (not sure exactly what, this is based off the cranking compression). With this they then turn and run 25+ psi. I have heard rumor of 30psi on one of these setups, but I have yet to confirm this. All of this is done without any meth injection, or fancy parlor tricks. But, these guys really know what they're doing, so big front mounts, and these turbo's are properly sized to run as absolutely efficient as possible.
Obviously our engines are slightly different, and things like heat and combustion chamber design will have an effect, so there is really no way to "know" what's possible until you do it.
I can tell you though these DSM's are really nasty.
UPP