I went back to the track last night.... hoping to get that 9 second timeslip and was highly disappointed.

The weather was 50-degree air, the altitude had plummeted to 267 feet below sea level. Not sure what the track temperature was.

Anyhow, I had the 2 step turned off all night. I started out with 12 psi in the tires and ended up with 10 psi in the tires. Dropping the tire pressure didn't help one bit. The car wouldn't hook at launch or even through 3 gear. The car was freaking scary last night.

Front shocks were set to stiff, same with the rear. Plenty of heat in the tires and I was in the groove.

I had all the spark plugs hooked up this time so I know I was making more power than last time.

What's my problem?

 

Track just had no prep?? Prep is everything you know. I wouldn't drop the tire pressure that low to be honest. We don't usually like to go below 11psi. That's just us but the car gets squirly from half track on at any lower psi.

Why'd you set the front shocks to stiff? Wouldn't you want them a little soft to help out a little. Cause with everything stiff all you have working is a under-inflated bias ply tire. Doesn't make for good times i would think.

I could be wrong but that just seems like the stuff that i've learned.

 

A few people were complaining about track prep but they had a few 6 second pro-stock cars running and some 9 second street cars making passes too.

I always thought that you were supposed to keep the front stiff so that it doesn't hop up and down between shifts? I dunno.......

 

My pro stock NHRA guy runs 5-6PSI in the rears. Front does'nt matter much because its only for steer. Soften the shocks, should help.

 

Here is the video from last night, might not be able to tell but I was blowing the tires away and let out as soon as I punched it in 3rd gear.

http://www.exhaust-driven.com/video/rx7.wmv

 

You want to run the front as soft as possible so the front will rise and transfer the weight to the rear tires.

 

I only have one way adjustables, this only effects the downward travel, not the upward right?

 

It should change both, they call them one ways because you can't adjust the dampen and rebound independently.

I thought i should clarify, most shocks are that way but not all of them. What shocks are you running?

 

Tokiko 5 way adjustables. What do you think?

 

Here is another one, the announcer cracks me up " WORLDS FASTEST RX7 "

http://www.exhaust-driven.com/video/rx72.wmv

 

This valve system allows simultaneous rebound and compression damping adjustment

http://www.tokicogasshocks.com/products/illumina/

As for the tire pressure we always put the car on a flat concrete slab and started off with about 20 PSI. Get inside the car and have someone slowly let air out of the tires until the outside edges touch the ground. That should give you a good starting point.

 

nice job anyways man, I hope you can get better times in the future. I wonder if the announcer drives a rx8

both videos made me excited as soon as you went to launch it was like music to my ears

 

Lupe
If your suspension is set up right you should be able to run as low as 7 psi without any problems. You have a solid rear in there not IRS. Take advantage and drop the pressure to suit conditions. Cold track is the worst for traction especially when the sun is not out. But you said a couple of quick cars made good passes so you need to adjust to suit conditions.
As mention before soften the front shocks up and adjust the rear to get the best combination of launch and down track traction. You should have change shock settings after the first run. Also you have skinnies in the front so pump them up to 40-50 psi.

 

Werd,


I used to be hardcore into drag racing for about three years and this is some good advice. If you are running ET streets, keep them below 12psi for shure. I usually drop pressure as the night goes on if the car is feeling right. I think I used to run between 6-10psi usually in my ET streets, in my low 11-second street legal pontiac. This was like 8 years ago though, so i don't exactly remember how low I did run them. You want the car to squat and lift the nose, since you don't have traction bars, so run her soft and start at maybe 10 psi next time and see how she feels.

good luck....9's here you come!

 

Oops! forgot you had a solid rear in the car. So yeah.....do what Crispeed said and you should be just fine.

That 2nd video looked like you were on one hell of a pass!! What the heck happened? Car sounds really mean and looks the part too. Man i love your car!

 

Stupid car was going through the tires like it was nothing. It's hard to tell from the video, I was cutting 1.70's all night long

 

Thanks for your advise Cris.

My ET Fronts say max tire pressue 35 psi I think, should I still crank them up to 40-50 psi ?

Can I run 7psi because the car is so light? I've never heard of anyone running that low of pressure. Dan Schechter says he runs 12-15 psi and he's cutting 1.3X 60 foots so I don't understand why I'm having problem hooking up.

Should I just soften the fronts and rears all the way and see how that feels?

And people say drag racing is easy

 

I think the previous video links are going to go down, here are some other links. The quality isn't as good but you get the idea.

http://videos.streetfire.net/video/6...43000c697f.htm

http://videos.streetfire.net/video/a...430004a28f.htm

 

were you launching off the rev limiter since your 2 step was off?

 

Not really, I was feathering it between 7K-8K.

 

people that say that drag racing is easy have never drag raced. Can you post the complete breakout of your two best time slips?

Andrew

 

10.36



113 MPH 1/8th

 

how well is your 4 link tuned? i think there might be something there, because 4 links can be setup to grip very well if setup right, if not they can cause lots of gripping problems.

 

Not sure about the pinion angle. I did just have the thrust angle setup when I had the allignment done. It's perfectly straight now.

 

are there any good shops around st louis that has experience with 4 links? id have someone look at who has experience with them and see what they say. with your numbers and weight you should be getting alot better than 1.9 60ft times, only othe thing i can think of that could be causing problems is the rear suspension?

this might help:

go about halfway down to 4 link calculator

http://www.performancetrends.com/download.htm#4link