Had the PIG out last Saturday Night @ the Quick 32 Arizonas Fastest Street Car Event @ Speedworld..

Anyway, finally got it down the track without an oil leak, trans leak, regulator going wild, or broken converter..

Ran the car all out @ 8:00 pm and the DA was about 3800'..
Went 9.15 @ 148.75 with a 1.30 60'
The high chip was set @ 7500 rpm. It was against it for 150'-200' says Billy D. EGT was 1270*
Shifted @ 6500.. Sounded like a 1 speed..Never heard it shift..

Next Run 9.08 @ 148.84 With 1.298 60'.. Same as first run.. Against the chip forever. EGT proves it.. went down to 1215*.. Shifted @ 6800.. Barely heard it change noise on gear change..

Another Run went 9.011 @ 148.94. 1.289 60'..
Didn't change anything.. Just the DA went down to 3000' by then.. The EGT was even lower 1170*

We also made a run on the T-Stop and went 10.82 @ 146 with a DA of 3800'... The EGT on that run was 1370*... So I know it wasn't against the chip..

I'm figuring the converter slippage @ 11.5%-12%

What I'm curious about is, can you tighten up a converters lock up and still have a high stall point? I would like it to stall @ 6200 in this air and still have 6%-7% slippage.. I think it is stalling @ 6700+ right now.



Chris..

Sure they can... makes it more efficient

I think you have heard me say this before. My 8" ATI stalls at 6200 and has 3% slip. Mine is WAY tight for all out runs but works perfect on the throttle stop. Keep after it you guys are chipping away it.

I have a fair video of one pass, but it is a new camera and I need to edit out some stuff. Not sure yet how to do it..

I'll post it if I can figure it out..


Where's Wild Bill when you need him..


Chris...

Chris,

Hydralic fluid will tighten convertor up about 200rpm. Easier than pulling trans out. If that makes it run faster you will then know the convertor is too loose. Data logging in best bet. If you do not have a full replay tach or a mega box than the fluid is your next easy change

And here I thought Fred was pulling my leg. I've never heard of this before..

I may try this..



Chris..

John Deere Hy-Gard...Been around and used in race trannies for years.

Finally got the video uploaded. Crew guys don't shoot good video..

http://www.youtube.com/watch?v=snkmp0AgFGU


Chris..

Nice Vid!

Definitely hearing it shift and didn't sound like it was on the chip at the other end.

What gear is in the glide?

As it looks now, it should be solidly in the 8's.

http://www.dragtimes.com/da-density-alti...rect+ET+and+MPH

Density Altitude: 3025 feet above sea level

1/4 mile ET: 9.011 seconds

1/4 mile trap speed: 148.94 MPH

Stock and Mildly Modified Naturally Aspirated Engines
8.684 @ 154.667 MPH

Extensively Modified Naturally Aspirated Engines
8.781 @ 152.943 MPH

Extensively Modified Supercharged and Turbocharged Engines
8.883 @ 151.077 MPH

The best part of all is that after the wreck and rebuild, Billy says it's like driving your couch on the top end.. So I guess we done good..


Chris..

I was able to snag a decent pic from the vid!

I could here it shift...not alot of flash but more than you want i guess. Just glad you had a good outing, Chris.

Just for info, here is a comparison of four different runs with two different converters and different rear gears. Stall speed is pretty much the same on all runs as was DA approximately, however coupling agressiveness is different, the more efficient convertor in this situation is the slower choice but has its advantages depending what you're wanting. Open attachment and view full screen.

Hook up the tach wire in the delay box. Will show you exactly what RPM you are crossing at, or maybe you did that already. I fou nd it very useful when sorting my heap out.

Oh yeah...ATI......ATI.....ATI

BTW I agree that the most efficient convertor is not necessarily the fastest. My car is a full two tenths quicker with a horribly inneficcient converter that slips 21%. It puts a ton of heat in the trans but the car is clearly faster when it is in ther. In my case the 6200 stall is killing me, that is a good deal below torque peak for me.