Lean Burn 1991 Talon AWD Auto

[theholycow]

Oh yuck non-lockup. No, in that case I imagine the lower speed is better, as the converter likely wastes more at higher speed (unless maybe transmission oil pressure increases with speed; IIRC that can affect torque converter slip speed).

[pgfpro]

Originally Posted by theholycow

Oh yuck non-lockup. No, in that case I imagine the lower speed is better, as the converter likely wastes more at higher speed (unless maybe transmission oil pressure increases with speed; IIRC that can affect torque converter slip speed).

Yeah no kidding. I wish I had the 2g Talon lock-up converter trans.

I'm running full line pressure all the the time now via TCU aftermarket chip.
I can shift through the gears and get it in the 4th gear OD really fast at low speed. I can be in 4th OD before 30 mph. Third gear before 5mph. But even after all these mods it doesn't seem to help that much.

On paper this looked like a great plan. But now it looks like its not going to help the FE side of things at all.

Performance wise its great!!! Instant fast firm shifts that duplicate a WRC car.

[pgfpro]

My new short block is done. Time to get started on the head.

[Tygen1]

To the issue of trying to shift an ATX early, it usually just results in excess torque converter slip and reduced mpg. I made a manual shifting box for my escort and found that by shifting early it just caused more than usual torque converter slip. Turns out the stock shifting stratagy was the best, ie: least amount of torque converter slip. By allowing it to rev up a bit (2000 rpm) the torque converter would slip less and the next gear would have less torque converter slip resulting in better FE while accelerating. A manual torque converter lock throws all this out the door

[pgfpro]

Originally Posted by Tygen1

To the issue of trying to shift an ATX early, it usually just results in excess torque converter slip and reduced mpg. I made a manual shifting box for my escort and found that by shifting early it just caused more than usual torque converter slip. Turns out the stock shifting stratagy was the best, ie: least amount of torque converter slip. By allowing it to rev up a bit (2000 rpm) the torque converter would slip less and the next gear would have less torque converter slip resulting in better FE while accelerating. A manual torque converter lock throws all this out the door

This is one of those things that looks great on paper but didn't work in real world testing. As you said its just making a bunch more heat at the converter.

Now that your over here on GasSavers you need to do a write up on your car.

[Tygen1]

Your doing pretty good for an AWD Auto, non lock up converter, in the winter. Once it gets over 70 degrees F, you should be over your goal. I think you are seeing the problems of having a non lock up converter when you slow down and your mpg does not improve, are you able to moniter torque convert slip percntage, or even tranny temp?

[pgfpro]

Originally Posted by Tygen1

Your doing pretty good for an AWD Auto, non lock up converter, in the winter. Once it gets over 70 degrees F, you should be over your goal. I think you are seeing the problems of having a non lock up converter when you slow down and your mpg does not improve, are you able to moniter torque convert slip percntage, or even tranny temp?

I'm very happy with it so far.

I might put a lock up type converter in it this summer?

I can't monitor torque converter slippage at this time. As far as tranny temp. I'm going with a after market A/T gauge.

It does have a A/T heat warning light. That has only came on once after doing back to back full boost launches.

[theholycow]

Originally Posted by pgfpro

I can't monitor torque converter slippage at this time. As far as tranny temp. I'm going with a after market A/T gauge.

No input shaft speed sensor?

[pgfpro]

Originally Posted by theholycow

No input shaft speed sensor?

Not that I'm aware of? I need to do some more checking.

[pgfpro]

Well this weekend I will start the rest of my build.

New Precision 880cc/min injectors.

SD Cable with a 4BAR MAP Sensor and GM IAT.

3" Exhaust System.

Devils Own Advance H2O/Meth. Injection.

HKS 264/272 Cams w/adjustable cam gears.

All these Mods are for making HP to achieve my Performance Goals, with hopes of not sacrificing FE. Only time will tell.

HP Goals:

10 sec. @ 125+ mph 1/4 mile running Pump Premium
0 to 60mph in under 3.5 seconds running Pump Premium

I change my mind on running E85. The closest station that has E85 is 50miles away from home and I just decided that its to far to travel and will be a pain trying to fill 55 gallon drums.