What the XRS needs.

[polo708]

Originally Posted by Fuel Injected

Why wouldnt he want to keep lift engaged during shifts? Its the most common drivetrain complaint Car mags have about the car, its ok if you dont know what you're talking about, but dont dig the hole deeper trying to prove otherwise.

if you are talking about my last post: I was talking about the rev limiter not the lift engagment point.
If you were talking about my first post: Its definately something that needs to be fixed, but there is obviously a reason that lift is engaged at such a high RPM.

Originally Posted by kini

Also, if it's a stupid for me or the other XRS owners to want to make our cars run better, then how stupid is it for you to stick a SC on an 18sec car to get it to run 17secs? I bet you also have nitros on it too. Sound like someone compensating for their own lack of equipment.

I love people like you, using big boy words over A COMPUTER. Actually I stuck a s/c on a 17 sec car (your feeble mind didnt know that one, but see where the dont care thing comes in for you) to make it run 14.78, and have a fc/pulley on the way to hopefully get me close to 14 flat.

Lack of equipment?? Your the one sitting stock bro... ask a decent question that hasnt been asked a million times already and I'll give you a good reply.

[silver04rollas]

OK, let me clear this up for you guys. I have been driving an XRS for 4 months now and this debate has been beaten to death about staying in lift and it gets on to my nerves since it is just plain silly without understand why has been done. Read these points and they have been thoroughly researched

Admit or not. Polo is right that Toyota has done everything for a reason.

1- Lift engagement has been raised as compared to Celica GT-S because the stronger midrange torque in XRS made it happen. Compare the dyno chart of an XRS and GT-S between 6000 rpm and 7000 rpm and you will see identical power in both cases while the Celica GT-S engages at about 6200 rpm while the XRS around 300 - 400 rpm later. GT-S has all the power concentrated above 6200 rpm while the XRS does not. Take your pick. People at matrixowners.com tried lowering the lift point to 6200 rpm on a Matrix 04 by swapping the 03 Matrix XRS ECU which actually slowed the car down since it messed up the low end torque distribution (ask redliner9k at matrixowner.com)

2 - Here is my break down of my best shift rpms from my own experience and observations:

1st to 2nd - land at 6000 - 6200 rpm (outside lift)
2nd to 3rd - land at 6300 - 6500 rpm (almost in lift but not quite)
3rd to 4th - land at 6800 rrpm (in lift)
4th to 5th - land at 7100 rpm (in lift)
5th to 6th -(have to be nuts to be going that fast in lift and not possible due to 135 mph limit)

2 - The only shift that is a problem is the first to second where it lands between 6100 - 6200 rpm with the best possible shifts. Even in this case I stay out of lift for a few split seconds and due to the decent midrange torque, it still accelerates reasonably outside lift for a few tenths of a second. Lowering the lift point to 6100 rpm or so will make negligible difference to acceleration.

3 - Corolla XRS redlines at 8300 rpm and rev limiter at 8450 rpm while GT-S redlines at 7900 rpm and rev limits at 8100 rpm so they have it equally as hard as us to land in lift, but they have no power below 6200 rpm so go figure.

4 - Celica GT-S people have lowered the lift point to 5800 rpm, but it made very little difference to acceleration because the engine needs very high speed to carry out that frantic burst of power. If this was the case, why not make the lift kick in at 2000 rpm and go up to 6000 rpm instead of making it such a high revving car??? Obviously, cam lift requires high rpms to make it explosive. Yes, raising the rev limiter to around 8800 rpm will improve acceleration since it holds peak power well past the 8450 rpm revlimiter and is well capable of revving up to 9000 rpm (Celica GT-S owners have raised it to 8700 rpm), but it shortens engine life without a doubt or blow the motor up in the case of a misshift because if you get revlimited at 8450 rpm and have a misshift, you will only rev up to 9000 rpm (it happened to me when I misshifted 4th to 3rd instead of 4th to 5th at 8450 rpm) and the car will handle it, but if you rev limit at 8800 rpm and misshift, the revs will go well past the 9000 rpm and kabooooommmmmmmmmmmm!!!!!!! engine is toast!.

Yes, I believe it was all done for a good reason. You can raise your rev limiter for substantial gains, but it will seriously mess up the motor (atleast that is what I believe). When you look at the facts, staying in lift at the begining of just shift is just a useless rant. Be my guest in spending lots of money to lower the lift engagement like the Matrix XRS people did, but it was just a waste of money for them. For your info, RSX Type S does not drop the lift lobe for intake/exhaust cams during shifts, but Celica GT-S and RSX Type S has always been considered a driver's race. Go figure!

[polo708]

this thread got quite fast??

[Chris Corolla S]

Sorry, I guess you boys cant play nice with your toys without name-calling.