richardjh

I'd wager there is a table in the ECU/TCU that dictates what RPM to use as the "clutch engagement" point from a standing start, based on Accel Pedal Position or TPS.

Bet it's 2500 RPM for WOT, barely 1000 RPM for light throttle... and linear between the two extremes.

It does seem to "get going" earlier at part throttle from standing... maybe the reason WOT "I've gotta go now!" situations feel unresponsive is that the "delay before clutch" period really is longer.

Hmm, that gives me an idea. I wonder how it would react to an initial wide open throttle (to get engine revs increasing asap), followed by a pull-back to 1/2 throttle (to prompt a lower clutch engagement point).

One more test coming up...

Rich

richardjh

*** IT WORKS! ***


Seriously folks, I believe it's the way to take off quickly in an SST.

Can someone else with this insanely clever transmission please verify. It's simple...

- You're on the brake.
- edit: You're in SPORT Mode
- You get off the brake, and whack the accel. to the floor.
- You immediately pull the accel. back to halfway (edit: or 75%... just back it off, really). Hold it there... and...
- Va va voom.

Please try. Then send me beer. Lots of beer.

Rich

madfast

so wouldnt it just be easier to rev it to 1000 rpm, then let off the brake and instant clutch engagement? obviously there is more wear and tear when you do this but its better than getting t-boned...

what i do is quickly rev it to 1000 rpm with brakes on, then let off the brake and simultaneously give it smooth throttle (not wot). this has always worked for me. and how i know is this one inclined street i go on. if it do it right, the car doesnt move back at all. if i time everything wrong, the car moves back a bit before the clutch engages.

this corroborates what you theorize, in that you must give it just enough throttle to engage the clutch immediately after you let off the brakes. if you gas it to much, the clutch engagement seems longer/at a higher rpm.

the bottomline is that mashing the throttle and waiting for it to launch like a bat outta hell with oncoming traffic is NOT the right thing to do... learn what works for you, and get that instant engagement when you really need it...

crankIT

iTrader: (1)

i'll try this next time im in the car, it sounds like a more aggressive form of 'blipping', but if it works, it works...

thanks for the research Rich!

migs647

iTrader: (19)

That's what I was saying earlier. It works great!

richardjh

Indeed you did, migs! I didn't "get" the significance of what you meant at the time... I do now!

When in NORMAL mode, the softer clutch engagement doesn't seem to really give this approach much of an edge... but in SPORT mode it's a whole different ball game. Then, the solid initial engagement gives you a lot more confidence the car is moving off when (and how fast) you need it to.

I guess it'd be easy to log the time taken from initial throttle stamp to (say) 4000rpm in 1st. Timing to a set speed won't work, as the speed value isn't updated very often. I hope this method (the Migs Method, hehe) has the jump on the regular WOT-and-wait approach. Then we'll know it's not all in our minds.

Rich

migs647

iTrader: (19)

I'm happy someone is finally showing some #'s on it

Doug200T

Haha sounds funny Ill have to give it a whirl on the road in a bit.

Wait a min isnt this a RA and didnt they discover this isnt limiting like the MR is

richardjh

Correct. On the RA, the TPS shows the throttle is doing exactly what your right foot is asking for. No 1st gear trickery.

We're simply trying to suss out why the RA behaves like it does when you're stationary and want to get going fast. Mine raises revs to 2500rpm (0.75 sec), then g-e-n-t-l-y engages the clutch. It's oh so smooth... which isn't quite what you're after if you put your accelerator pedal through the floor.

Rich

Optiblue

iTrader: (5)

hopefully this delay can be tuned out!

EvoJutsu

I usually just play with the throttle. U can pump the gas(blip it a little on and off on and off 0 but not for so long). If u do it right, the car will barely inch forward move and u can get the revs to 3000k and mash the throttle down. Ur foot is never on the brake when ur doing this. Has anyone tried this? Or this probably unsafe for the clutch engagement. Someone let me know thx.

IndyEvo66

yep. mr's and ra's are dif. didn't notice you had a ra.

MR. EVO MR

iTrader: (9)

Just pile migs647 pointed out, at a full stop You only hover the brake pedal NOT ALL THE WAY DOWN. This will stop the delay