Quote:
Originally Posted by buditjoenawan
Paul has said very clearly that this motor in stock form does not support powers beyond 320-330whp on 92-94 octane. Show me a motor that hold up beyond that on readily available pump gas and I would agree with you. All the data that shows big power is done on E85, which isn't widely available. Case in point, I have a friend with a Turbo MR2 that has an E85 tune. He drives 45 minutes to get his corn juice from his place in Dallas. Now, I don't know about other large cities, but in Dallas, E85 isn't readily available. For that reason alone, I would classify E85 as specialty fuel.
Also, to Paul's point of difficulty of a tune; think of it this way: if you're tuning a big turbo that is on boost for a narrow part of the RPM band, then you only have to tune for that band. If you have a properly sized turbocharger for the motor and it produces torque over a large RPM band, then you'll have to tune for that entire band. Am I wrong? In my mind, tuning for a big turbo, you can leave the lower half of the RPM band alone and not even touch it.
Back to power levels, this motor has shown to be octane limited to around 300whp +/- 10%. By octane limit, I'm specifically referring to 92-93 octane, 91 octane users see an even larger deficit. Am I incorrect in this? I have never seen a 400whp 93 octane chart. At least not from a dyno that I trust. 
-budi |
i've tuned everything from gtx28r's to a gtx35r. the 'easiest' kit to tune so far has been the full blown 35r kit. it has a lot more to do with maf placement and the quality of the fueling components than anything else.
in theory your assumption about tuning difficulty as far as where the car is making power would make some (though very little) sense in the context of a speed density system, where you have to tune at every given manifold pressure and rpm, so obviously a car with a wider useable manifold pressure range would take longer to nail down. in practice, you don't just tune half of a map in any case. you tune the whole maf, tune the whole ve table, and then set the threshold wherever you deem necessary in a hybrid system. at least that's how i do it. i suppose you could disregard the parts of the ve map that aren't seen in real life, but that would just be a shortcut and probably not the best idea. of course the avo kit wouldn't need a hybrid setup to begin with on pump gas, and would just be a simple maf tune that wouldn't really care how big your turbo is.
cars are knock limited on pump gas, not power limited. fuel limits knock resistance, knock limits power. 550whp is 550whp, regardless of the fuel you're using to make it.
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lexusb3 has been beating his car north of 400whp for something like 20k miles. he's making ~550whp now.
i'll just ask again, has anyone documented a failure of an fa20 at ~300-350whp that wasn't caused by bad tuning or something like overboosting? what data are people using to arrive at this conclusion?