yep, on hitting the tires to hard, more air would help, if you have double adjustible shocks, try stiffening rebound, and softening compression a little, that is if you use that intersect point.

et
 

i ran at madras sat. & sun., put the msd 6a in now my tach reads correct and the shift light works! set it at 6900 rpms, sat. temps in mid 80's with clouds air was 4500', ran 1.484@60 and [email protected]: 1.505@60' and [email protected]; 150.4@60' and [email protected], first round 1.513@60' lifted; round 2 1.485@60' lifted; round 3 1.452@60' ran 6.465 @97 mph ! break out. sunday backed compression off 2 marks (rear shocks) weather was clear and cool ran1.462@60' [email protected]; and 1.486@60' and [email protected]; and 1.460@60' and [email protected]; round 1 red light 1.492@60' and [email protected]. ran both lanes with a small difference between them, i tried 7# air then went to 8# after first run (sat.) then went back to 7# for the rest of the race, it was a race both days so its hard to play with the air and shock settings. next race 2 weeks and i'am going to put a delay box in it and try s/pro. bowler

did you stiffen rebound? if not next time out, you may want to try that also.

2" off IC? no way on that roadster
 

If you have not yet resolved this cars behavior off the line yet, I recommend raising the IC at least 4" higher than it is now. If you are not guessing where the IC is, then that long wheel base and with a mouse power (I presume) will need a raised IC be able to plant your tires thru the 60' . If you know what your crank height is as well and it is much at all below 11" then you will have a hard time getting your car to hook with repetition at your power level and wheel base. Your car was likely set up for over 1000 HP with 2" off IC, the 50" is short for big power but a mile long with a setting at 2" off the ashephalt. If you raise the bottom bar one hole in the front and raise the front of the upper pipe at the same time this will raise the IC and make the 50" IC seem shorter to the car than it does now. Shortening may not be the best path with that long 108" WB. Work with the height first then the rebound on the shock to get control on the big end.
johnracer has a roadster with a shorter wheel base than yours and seems happy with his wally winning roadster after raising his ride height to raise the crank higher and raised his IC to get his to react better.
Bruce

Re: 2" off IC? no way on that roadster
 

Hey Bruce! Wassup? Thanks to you, yes I'm very happy with mine! Currently the car is WAAAY better than I am though. I need just a little luck.........you wouldn't believe how many times I've lost races by just a few thou this summer! Dang good racing, but the win lite keeps coming on in the wrong lane........good to hear from you
Johnny

Hey Doug, is that your pic on pg 62 of the latest National Dragster? Very cool!! Congrats,
Johnny

Page 62, YUP there is Doug
 

Wow Doug, aren't you something. Best engineered car award! That is great Doug. Johnny has a great eye doesn't he!
Good call John.
John, Doug is tightening the back spread to help his reaction like you did on yours. Doug is not scarred to change his 4 link and knows his car very well. I am confident he will have it right where the wants it to be soon, if he has not already. You both are a pleasure to talk to about chassis set ups because you both actually do them and don't just take opinion poles on changes.
Bruce

et
 

Johnny thats me! thanks again Bruce raced, at madras this saturday cloudy and cold in the 40's they hot lapped us to try and beat the rain, (sunday rained out) i used a delay box for the second time ever first run let go of the button and nothing happens? i let off the gas oh crap nailed it had a .567 spun and ran [email protected] run 2 a .488 red ran [email protected] run 3 .560 ran [email protected] run 4 first round a nice .673! ran [email protected] round 2 .570 ran [email protected] fianlly ran someone that could cut a light and my day was over my 60' were (thru out the first one) 1.468, 1.421, 1.454, 1.457. with 6 1/2# air, just proves you can't teach old dogs new tricks! even with a delay box i can't cut a light i had a friend run it for t/o and he had a .518 light! i'am done for this year, but i will stay with the delay box also i'am going to sell the donovon block, oil pan & crank so i can build a 434" or a friend has a bbc fresh this year that dyno'ed at 825hp ran 920's @ 3400#. next year will be fun Bowler

Definately stick with the box. They're not magic and take time to get used to it. Personally, I think the bigblock would be the ticket. I've always run run smallblocks until I got my 522 and I probably won't go back. What a difference!! It just keeps on pullin!!
Congrats again,
Johnny

434"
 

just fired up my new motor last night, first time out will be Boise Idaho's oldies race June 5-6 this motor is a Dart block with a compustar 4" crank 6" h beam rods & JE pistons 58 cc AFR heads suspose to be 14.7 to 1 on gas, maybe i'll see those 1.30's @ 60'. bowler

Ready to see the numbers that puts up. Good luck. What kind of air do you guys see up there this time of year?

Curtis

Thin air, high altitude thin air. LOL

new 434"
 

ran the car at Boise Idaho this weekend with new sbc i'am about 100# heavier then with the aluminum donovon, and finally got in the 130's @ 60' although best was a 1.395, first full run was 1.402@60, [email protected] run2 1.407@60', [email protected] run3 1.395@60' 9.572 these were on sat. 70's last run had a overcast, sunday was cool & overcast only got 1 run at 1/8 mile it was 1.413@60' 1/8 was [email protected] first rd. 1.397@60' [email protected] got the win only to have a dead battery for the next run(lost the alternator belt) i still feel i'am losing some et in the 60'?.

Doug, I don't think you are super far off. I now know that my car is 2050lbs with me in it, I have 4.88 gears. So you have 350lbs more and less gear than I have. Here are 3 runs from last weekend in less than great air.

1.377 1.367 1.403 1.381

3.974 3.952 3.981 3.966

6.215 6.188 6.201 6.200

108.52 107.62 109.44 107.95


Curtis

Doug, we've been friends for 3 or 4 yrs, and i'll be the first one too tell you i don't know what's wrong with your car, but there's definately more on the table on the 60' times. Below i've posted a couple runs with a car that i built the motor in and the other car is a friend. It's a Luv truck with a 434" on 200 shot of nitrous the Biscyne has a 468" pump gas street motor and if you look at the right hand count down the Biscyne is the #3 car it has less than 1.39 60' times it weighs 3700lbs without the 200lb driver,the Luv truck has has 1.27 60' times it weighs 2550lbs.It's a true 10.5 tire truck.
My thinking is that your car is not hitting the tires hard enough, but i don't know if that converter or launch RPM I'm not smart enough too make that call, but i'm sure some of the chassis experts have the answer
The left ticket is motor only on the Biscayne

Zip.

http://img.photobucket.com/albums/v5...Biscyne001.jpg



http://img.photobucket.com/albums/v5...2010ET-1-1.jpg

60'
 

could the rear tires be to big? hoosier 32.5x16.5x15 c5 they are almost 17 1/2" thred at 6 1/2#, i will run at Madras drag strip this weekend 1/8 mile and will try different shock settings & air pressure thanks Doug

I'm running 16.5-33 Hoosiers w/6 3/4lbs of air. The reason I'm running that big of a tire is the dragster friends of mine put about 100 runs on them and then I get them free :D I have been thinking about buying a set of the 14.5-33 lightweight Hoosiers though.

Curtis

Hey Doug, good to see that you are running again! I agree w/Curtis. With that big tire and 4.56 gear, you're probably pretty close. Personnally, I'd go with a 4.88 with that tire and weight and a small block. I figure you're probably turning 7000-7100rpm at that speed and a 4.88 should push that up to 7400 or so and knock about .03-.04 off the 60'....what is your stall speed with the 434? Cam specs and heads?
You could go with a lower 1st gear in your glide if you don't want to wind it that high. I had a 2.03 in mine with the small block and a 1.98 in it now with the 522......
Johnny

60'
 

Johnny the stall is 5000, cam is a bullet roller 660/647, 278/286 @ .050. seperation at 108, heads were ported by darly white and are afr 227, brodix dominator intake with 1050, my wheels are alumastars 15x 16" wide looks like i might have to try to sell or trade for 15x15 or 15x14 to be able to run a 15" wide tire?. Doug

With that long duration @ .050, I'd bet your torque peak is well above that 5000 stall, even with 434 cubes. I'd think 5500-5800 stall would make a huge improvement. I'd go with a shorter tire rather than narrower to give you more effective gear at launch if you decide to change tires.....jmo

Where did you end up with your 4-link?

Johnny

60'
 

i talked to Bruce about my 4 link which was set at 43" out & 6 1/2" up he thought the i/c should be out a little more and the spred on the bars at the housing should be 10" so i adjusted it to 10" & the i/c is 50" out & 6" up. raced sat. 5 runs 60' were between 1.414-1.446 et were 6.135-6.218 (got hot in the afternoon) sun. i adjusted the rebound tight & loosen the compression 4 runs 60' were 1.389, 1.384, 1.400, 1.407 (these 60' were my best at Madras) et's were 6.104, 6.140, 6.124, 6.136. can't wait to run at woodburn, the car is very consistent (considering this track & heat) since i put the 434" motor in this year, one other thing i did check the stall while on the t/b it is 5000, thanks to all for your input Doug