Hello, I've got some questions regarding the AP2 car.
I heard somewhere that if you use the AP1's ECU for F20c motor on the AP2's F22c motor, you can use up to 9000 rpms.

Is this true?
if so, then where would you get the AP1 ecu
and how do you change the AP2 ecu to AP1 ecu that you got from somewhere?

thx in advance for the input.


-MGK

 

i dont think this would work.. or if it does, it might make you loose power. the F22 motor has a lower red line because of the bigger displacement and more torque at the bottom end..

if you put an ap1 ECU on this, it might not inject the right amount of fuel into the chamber, which might rob you of power. also, you might end up damaging your engine in the long run since the f22 wasnt made to rev safely to 9k..

BUT i might be wrong.. anyone ever do this?

 

watch this video to see what happens when an F22C is revved past 8k near the end

http://video.google.com/videoplay?docid=-5...q=s2000&pl=true

 

billman has a thread somewhere about several cars he's done this to. So far, none have blown up that I know of.

 

Ouch

 

That looked pretty cool.

 

We (our schools racing team, yes an s2000) have talked alot about this, and worked with honda being that we are a honda school to see the benefits of this. What we have leard is that it would in theory work and yes the f22 motor could rev to 9 grand but would have no reason to because the peak power is at about 8 grand. We decided that we would end up shifting at 8 anyway being that we could not get any more acceleration out of it.

 

eh I don't know about that. it depends how low the engine revolutions fall when you engage the next gear. Say if you shift at 8k your revs fall to 6k (I have no idea on an F22C, just use that for comparison sake). If you were to shift at 9k the revs fall to 7k avg on the next shift. If you make more power from 8-9k compared to 5-6k, it could be worthwhile.

 

Did you actually calculate out the amount of acceleration you would have past 8000rpm and compare that to the amount of acceleration you would have after shifting at that point? I suspect if you run the numbers, you'll discover the acceleration is much greater by continuing to 9000.

It'd be a good class exercise to actually calculate those numbers.

 

you would still accelerate faster if you shifted at 9000rpm on an AP2 than at 8000. the math has been done before.


as for this mod, yes you can swap the ECUs, however, you'd have to have it done by a dealership due to the immobilizer. obviously, then, this voids your warranty.

also, the reason for the drop in redline is because of the bottom end of the F22. an F22 spinning at 9000rpm is like an F20 spinning at about 10,500rpm or greater. the forces acting upon the bottom end increase exponentially. it's not a question of IF the engine will have a failure such as a broken rod bolt, but WHEN.

the people who have this mod and have "not yet had any problems" also don't really rev to 9000rpm. in fact, just about every one of them never goes above maybe 8400 or 8500. and even if they do, it's very rare that they do. this is probably why we haven't seen a failure.

if you do this mod, and drive it like an AP1 shifting at 9000rpm, something WILL eventually break.