Launch critique??...I'd say you tree'd me with a red light...

Sorry Mike, couldn't resist

I've found mine generally chatters the tires before it's on the verge of full spin. My car weighs 1830F/1510R, 113"wb, 125 lb rear springs. It has run either 10.5x29.5 or 10.5x31 M/T's. Mid 1.2x-low 1.3x 60 ft on the foot brake. In my case it took raising the ladder bar to gain some separation to apply enough load on the tire. As Dizuster stated with his I also run the front rebound close to full tight. Adjust for track conditions with the rear rebound. When it gets greasy loosening will keep the 60ft spread closer from best to worse. When it gets goo, tighten them up and it'll go quicker yet.
Doug

[quote=MoParFish]
Launch critique??...I'd say you tree'd me with a red light...

Sorry Mike, couldn't resist

Funny, thats the next thread, how to slow down my reaction

NO, it didn't. I don't even have to see it to know that is not even remotely possible. Your car will NOT blow the tire off at the hit. Now it might shortly after because it is crushing the tire, or topping the front and THEN spinning. But it is NOT doing it at the hit of the throttle.

The reason I asked about the "chatter" was to see if you described it as a shake. Tire shake is caused by too much bite and or not enough wheel speed

The video was with it footbraking, I didn't have a vid, with the transbrake launch. Transbrake 60 foot was 1.51 and spun instantly, I only have one hit with the brake so far. As Al Mentioned I need to sort the issues using the brake I just havn't because its not hooking just footbraking.

You need to quick footbracking the car and start working on how to get it happy on the brake. C/Gas being a .400 Pro Tree deal will require you to run it on the brake. So quit trying to get it to work footbraking. Just putting laps on the motor and making no progress.

As Monte pointed out I highly doubt it is blowing them off at the hit. Likely just after that when the suspension is being upset. Those front shocks have VERY little front travel,nature of the beast. Having said that you should be able to get them to work but they do likely only have 3" or so of travel is my guess. Applying power to get the wheelspeed up will help with the shake and pitch rotation most likely. Also don't be afraid to go DOWN with the tire pressure.

What we are trying to tell you is that NOTHING, not even a fuel car spins instantly at the hit. It's what happens AFTER the hit that matters.

That shock may only have 3" of travel, but that's plenty at the wheel and that is where it matters.

If it shakes the tire, that generally means it is hitting the tire TOO hard. Ways to fix that are tighter shocks on extension, both front and rear. More power or lower the tire pressure

What he said

for this, didn't want it to fall off, any up to date news on this.

waiting for springs, I'm looking for a TNT close to me before November, There's a Chevy race on the schedule that has an open lane, Might put a Nova badge on it & jump in their party. I get this thing to hook in good air it should get me in the low 50's or better

We call it SCSN, or Street Car, or Streetcar Supernationals

Man I wish I could do that race, Don't have the vacation time and cant afford the trip right now

Mike Cunningham will be there to win the non E "again" and wish I could at least go to support him and watch. have try to do something local. Good luck AL!!, I will be at least watching you guys on Bangshift!

We actually will not be running there this year at all. Well maybe the dragster but not sure honestly.

So what spring did you decide on? I believe you had the 250 on the front correct? Or were you changing the rear?

Ordered 200 lb fronts and 110 rears, going to change the fronts at home and set ride height and that's the only change I want to do for the first hits. If it hooks i'll leave it. if not i'll change the rears at the track.

There is a race in Fontana next weekend. Free test and tune on Friday. A few Moparts members are usually there. NMCA West race, track prep is usually good as long as it is not 100+ degrees should be good. Plenty of classes and lots of opportunities to put laps on a car. Many of the bracket guys double dip at least.

Don't assume that changing front spring rate is gonna be the magic ticket. IMO some good video would help a lot. No reason you cannot get it to work but might need some more changes. Don't forget the converter as part of this package, you might need more stall speed to take some of the aggressiveness away at the hit....

Noted Al, I had the converter adjusted with the Dyno sheet by A-1 which Is what my converter is, Jason recommended them and they adjusted it from 5600 to 6300 per dyno sheet. do you think its still too tight?

I need to give the springs a try, cheep enough test.

AHHHHH... so not only did we "increase" HP, change the front suspension, we did a huge converter change. .... the rest, of the story. personally I'd love to see what would have happened leaving the converter "as is".

I mentioned that somewhere deep in page one J. Thats next on my agenda, to call A-1