The day started off bad with a 12.635 @ 108.85. By the last pass of the day I was able to get a pass of 11.274 @ 125.96.

The powerglide is nice but the 1.76 first gear means the car is really slow off the line. I was launching at 4000 rpm and getting consistant 1.70x 60' times. The 1-2 shift was at 7200 rpm and I go through the traps at 7200 rpm.

Here's a pic from 2 weeks ago when the TH400 tranny was acting up and I had no reverse. This was a foot brake launch and dialed in at 12.42 however the car only ran a 12.54 @ 110 mph with a 1.685 60' time. The quality of the picture isn't great and this is a digital photo of the original picture (can't scan it yet). I was surprised to see both wheels off the ground and they're both up equally meaning my suspension is working perfectly. There's very little squat in the rear suspension and the tires have a huge wrinkle in them. That's a 29 x 9 slick. This picture shows me about 6" past the starting line.

 

nice, have u ever decided to launch off the transbrake to see if you would be quicker at all, like with the motor you have now?

 

Nice pic Stephen. I am sure you will get a 10 second slip before winter shows up here on the prairies.

 

That picture was with a hurting TH400 with no reverse and a transbrake that wouldn't hold. Now that I have a powerglide installed with a TCI transbrake, that's the only way I was launching this weekend. I set the 2 step to 4000 rpm and used the transbrake every time. I tryed launching at 4400 once but broke traction and went sideways almost crossing the center line. Perhaps on a cloudy day when the track is sticky, I can launch at a higher rpm. My tires are just about worn out also so it's time for some new taller slicks and probably swap out the 4.56 gears for some 5.14's.

I turned off the 2 step to test the transbrake in the pits. The converter stalls nicely at 5700 rpm.

The first poor pass today, I only launched at 2800 just to get a feel for the new tranny. After that I was just trying to improve performance and got it to almost where it was before. My float levels were too low in the carb. The fuel is now way above the sight glass in the Demon bowls but the engine loves it.

 

i was wondering what were your 60 foot times for the run that u have pictured.

 

That weekend the best was only a 1.663 and the worst was 1.716. That pass was a 1.685. I just double checked my logs. That pass was on the Saturday night/afternoon when the transbrake was still working. That's a 2800 rpm transbrake launch.

This weekend I now have a powerglide. The last 3 passes of the day were 1.700, 1.705, 1.706

I went from a 2.48 first gear and 4.56 diff for a total of 11.30 torque multiplication with the TH400 to a 1.76/4.56 for a total of 8.02 torque multiplication. It's like launching in second gear with a TH400 or TH350. Since there isn't as much torque multiplication, the 60' times are now going to be a lot slower. If the 60' times stay consistant, I don't really care.

It's actually kind of nice only having to shift once. With the TH400 I was shifting out of first just past the 60' mark. Now I shift out of first just before the 1/8 mile.

 

opps u did mention your 60 ft times in the beginning of the thread .your times with the th400 isnt to far off my times.so im thinking ill get the fronts wheels off the ground like u did, once i get my 60ft in the 1.68 range which is a little more than tenth of
a second from my times (mine was 1.80).

 

Thats one of the reasons I dont like the glide that and I never wanted to strip a car that far down to reduce weight.
Easy transmissions to rebuild a whopping hour and it's GTG.

How many more RPM do you think you willo turn with the new gears? Kinda scary.

 

New gears will also mean new taller tires to compensate for the deeper gear. I could just keep the same size tires and live with the slow and consistant 60' times A couple more races left in this season and these tires are going to be bald. No cords showing yet but the wear bars are almost gone. If I don't go with taller tires I'll at least upgrade from the 29 x 9 to 29 x 10's.

I'm looking at trying to squeeze a 30" tire into the wheel well. This is going to mean having to section the inner fenders to a more square corner. I'm considering finding a set of 4.88 or 5.14 gears for the new tires. I'm only shifting at 7200 because that's all I need. I was shifting at 6800 with the TH400. The cam and engine are built to go to around 7500 so I could go higher if I needed to. At 7200 the engine is still pulling hard so I know I haven't gone over the HP curve yet.

I wonder what the engines volumetric efficiency is at 7200 rpm? I may be at the limits for this 850 carb. A 1050+ Dominator would be nice. Maybe a tunnel ram with a couple of 750's.

 

stephen, are you allowed to use mechanical injection?

i believe enderle makes n/a specific alcohol injector hats.

injector hats are super easy to tune, and flow insane amounts of air

 

I can use or do pretty well whatever I want. Blower, turbo, injection, NOS etc.

I have been considering an injection system. As nice as an Enderle, Kinsler, Hilborn or Crowler system would be, the best setup is from Ron's Flying Toilet. www.ronsfuel.com

If I had to choose between buying a new alcohol Dominator or King Demon or buying a Ron's Toilet, I'd put on the Toilet and wouldn't even consider a carb.

 

Here's another pic from the same weekend. Again it's a digital photo of a picture so it's not as good as a scanned picture. The picture is a little distorted because the camera is at an angle to reduce the flash flare.

This is in the other lane and is looking at the other side of the car.

 

You can get 1.96 1st for PG (I think that's the number, anyway).

Buddy I pit with has a 468 '83 MC, back-halved, stripped fenders, glass hood & trunk. 4.56 (I think) 9". Weighs about 2800 going down the track. Has been running a TH400, it died, put in a PG with the taller 1st.

Used to run 11.0 on good air, 11.2 on bad air. He's pulling 10.75's with the new PG.

Remember, this is at 5800' elevation.

 

All the aftermarket PG gears are expensive but if I had the option to change mine, I'd install the 1.80 straight cut gear set. You don't want the gear spread to be too far apart. The rpms drop a lot already during the 1-2 shift.

 

The glides are definately nice with only 1 shift, when I started racing the truck it was like a sunday drive, come outta the hole, wait forever, hit second and sit back enjoy the scenary Have you had a chance to experiment with different pills yet. When we were first testing we started with a 4800 pill pulling 1.52-55 60's and found the 4000 pill with a 1.45 to best the best to date. Right now we lowered it to a 3600 since we're having severe consistent traction issues and this seemed to help, but we dropped to 1.49-.50's in the 60'. Hope we can get it to stick since the fall series is approaching, would love to see some sub10.5's for once. Also, did you get your convertor built for the glide or is it the one outta your TH400?, maybe that could be hurtin you a little too, might be a tad more slippage off the line than before. How are your tranny temps with this new one compared to the old trans? Our glide usually comes in around 140* as does my car with the TH375.

 

I think my problem with 60' times now is the fact that my tires are just about worn out. There's very little left of the wear bars. Some new Goodyear 29 x 10's were ordered today. I don't think I'll have them before the next race unless I pay for air freight but I should have them before the end of the season. With the mph I'm getting now in the 1/4, there's no reason I can't get into the high 10's now once I get better traction.

I couldn't to a lot of test and tuning because I was in eliminations. For all I know, launching at 2500 might be better. I'd still like to do a full transbrake launch without using the 2 step just to see what 5700+ rpm launches are like.

I installed a TCI Vaccu Melt 300 input shaft in the PG to use turbo spline torque converters. I'm still using the same race converter that was in the TH400. At $1200, I'm not about to go purchase another converter for a while. I might send this one away during the winter to get refreshed.

Tranny temps are still low. Even sitting on the transbrake at 4000 rpm for a couple of seconds, the temp doesn't get above 140*. My tranny cooler is the same size as my rad and my rad is out of a turbo Firefly. The temp of the TH400 hardly moved but then I was only launching at 2800 so I never gave the oil a chance to heat up.

 

Generally speaking, on wrinkle wall tires, your side walls will "wear out" before your actual tread does. This is especially true on heavy, high torque, hard leaving vehicles. When this happens, your 60 ft. times will start to fall off. Since you're almost down to the wear bars, new tires sound like they will definately help in your situation. With new tires and cooler weather coming, it looks to me that you should have a 10 second time slip by the end of the year.

Were you able to get the 50% off deal on your Goodyears?

 

This "hero" of mine with the MC was having problems with his RTs. In fact, two weekends ago, he was faster car & had 3 redlight wins, but his RTs were below .000 also (ended up winning the whole thing that weekend, anyway). Finally figured out last weekend that his adjustable 2-step had a broken wire, and he was actually launching off the converter at 5500 instead of off the 2-step at 4400. When he fixed the wire, his RTs went back to his "normal" .00x's or .01x's, but his ETs were now slower (10.8's instead of 10.75).

Basically, he's using the rev limiter to "slow down" the car's reaction so he can pull good RTs consistently.