Pre-pollution-controlled, especially high compression engines used to rev down much faster when the gas pedal let go. Thus, you could give the gas pedal a quick tap when shifting gears, which provided lots of driving fun and "feel" for the engine that I miss also when driving the Stook. The modern engines, with no exception, when you tap on the gas pedal it may rev up OK, but it hangs up at the higher RPM for a second or so. I'm told this is done in order to burn residual gas in the engine. If true, then how, by briefly continuing advance timing?
Is it possible to get that kind of throttle/engine response (more common to offroad, racing engines) from the Stook engine?
A programmable ECU? I really do not want to change other operating functions.

Expert opinions will be much appreciated.
(please don't tell me about sychromesh gears, it's not the issue)

 

Not a Expert opinion.
But I think a lighter flywheel may help in a simple way.

 

Hey guys, why no answer?

 

The lack of response may be because we don

 

I know what he's talking about and a lightened flywheel will only minimally reduce this effect. I think it's just the ECU feeding fuel (hell, maybe even air from somewhere) so that you don't go to a full closed throttle situation. The idea is to avoid letting unburnt gas into the exhaust and it works well at that, although, I also would prefer if the revs dropped like they should.

Anyway, dunno what to tell you. I bet if you get a Motec you'll see the problem go away. You'll probably also notice your car will backfire on shifts - not necessarily a bad thing, but it goes along with fast dropping RPMs.

 

Thanks guys, BTW this ECU control mode was just mentioned by E30M3 in Car Talk on flywheel.

Rev, what's Motec? you got me there...

 

http://www.motec.com/
(full aftermarket engine management)

 

<<Anyway, dunno what to tell you. I bet if you get a Motec you'll see the problem go away>>

You can reduce or eliminate this on BMWs and other cars with a chip or ECU reprogram. And other irritations such as the speed limiter. Maybe someone will come up with aftermarket software for the S2K at some point...perhaps Hondata or equiv. I wonder if this characteristic has been changed on the Mugen ECU. They put it there in the first place to cut the little puff of pollution which takes place during gear shifts. Most cars these days pollute for about a minute after a cold start; subsequently they are clean as a whistle.

Stan

 

MoTec programmable ECU, on the surface looks like a lot of fun.. I was involve in tuning cars in the pre-ECU days, and may have time to do this again. I do not think the Mugen unit is programable, I read somewhere on the Forum that it does not perform all of the OEM ECU functions.. besides I like to do my own cooking, time permitting.
Anyone experience with an after-market ECU in the S2000?

 

ask about it on http://bbs.theoldone.com/ there was a guy that posted there almost a year ago that had a 360 rwhp turbo s2000 with a motec ecu. Be warned - motec is the farthest thing from plug and play. You have to completely start from scratch with new sensors and no real base program to start from.