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Author Topic:   set up help needed-thanks
Wheels47
Member
posted May 18, 2003 01:18 PM
check ur shocks ,they be getting hot and transfering to soon


155fan
Member
posted May 18, 2003 05:12 PM
Why did you raise tire pressures when the track slicked off?

155...if the fuel cell is all the way to the left, you lose crossweight as fuel burns off.

[This message has been edited by devil wrench (edited May 18, 2003).]

Dirt-Tracker
Member
posted May 18, 2003 09:14 PM
Its a Jet mod Swing arm Viper. Has 250 LR,225 RR, 750LF, 850 RF. Has 140 Lbs of LR in it. The pinion angle is 6 degrees and long panhard bar is mounted 4 and 1/8" on chassis side with 6 degrees angle. Had 11 lbs on both left tires and 16 on right. Goes crazy fast anywhere on track for first half of feature then goes real tight last half. I run 2 off on all wheels except RR. Had a spacer in LR. Im only burning off about 8 gallons of gas in a feature. Had about 57% rear %.

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"Somedays your the dog, and somedays your the fire hydrant!!!"

www.geocities.com/albertson28racing

155fan
Member
posted May 18, 2003 10:05 PM
Devil wrench, I believe 155fan is right on. Here's the way I visualize it, though this may be way off base. With the fuel cell mounted in the LR corner, as fuel is burned off, the height of that corner rises and adds weight to that corner, which would increase cross.

justin

[This message has been edited by justin (edited May 18, 2003).]

Geffy95x
Member
posted May 18, 2003 10:22 PM
Have you checked your stagger before and after themain ,including front end, what are your tire temps?,how much pressure do they gain during main,camber? .


dirtracer14
Member
posted May 18, 2003 11:31 PM
I am just asking here but is the car getting tight or is the driver driving in tighter to make up for the lack of side bite getting in? This sounds like the first laps the car is bad fast but starts to go away so the driver drives it in real tight to keep the rear under him? What happens if you try to drive in with the rear of the car? will it get loose or still stay tight? if so tight on the gas of tight driving in? What about rear brakes are they fadding or are you using more front brake?


155fan
Member
posted May 18, 2003 11:48 PM
Whats the tire temp on the rf? If you overcook that dog it wont point in the right direction. Also do you run a track that tends to take rubber?


A2KY2K88
Member
posted May 19, 2003 01:44 AM
As fuel burns, you are gaining cross %. This will make it push a little more. Also, your left rear could be gaining more air pressure than your right rear therefore decreasing stagger throughtout the race which also contributes to tightening the car. Start the feature with a little less cross%.


Dirt-Tracker
Member
posted May 19, 2003 11:44 PM
The way it usually runs......I hammer down the straight and when I let off the gas a bit the rear end makes its move. Then it sets and hammer down and the LR picks back up and brings it on through the corner. Sat. night it worked good for about 7 or 8 laps. Jumped from 8th to 3rd. Then started back pedaling. Come into the corner, let out of it and it would start up the track. Then it was **** trying to get the rear to come around. I dont know.....its never done this before. I do r8un alot of rear brake. On the tire pressure...I was told to raise pressure on dry slick to put more of a hard surface on the track. Im open for suggestions, please help!!!!!

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"Somedays your the dog, and somedays your the fire hydrant!!!"

www.geocities.com/albertson28racing

Mudrat454
Member
posted May 20, 2003 12:40 AM
Do you have good racing brake pads on it? Sounds like the rear brakes may be fading. I tried some pads from the parts store last year and after 5-6 laps I could hardly get the thing to slow down on a tight 1/4 mile track.
On a dryslick track I usually lower the tire pressures.
Do you run at Winston? If so did the track get slick last weekend after the MLRA boys ran? I was there last fall for the USMTS show and man that track was slick!


Wheels47
Member
posted May 20, 2003 09:15 PM
We run at Winston and yes that track was slick last fall. I run B-Mod. The track wasnt as slick after the MLRA guys but remember this was just one night, the USMTS last fall was 3 days.
I do run the cheap O'Reilly pads, but I have always ran them with no problems. What kind of % do you run brakes from Front to Rear? I had alot of rear brake dialed in. But your problem sounds exactly like Im having wouldnt slow for anything after half of feature.

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"Somedays your the dog, and somedays your the fire hydrant!!!"

www.geocities.com/albertson28racing

Dirt-Tracker
Member
posted May 20, 2003 09:35 PM
1 more thing.....I noticed I have only about 1" of room between the end of my drive shaft and tranny end. Is this enough clearance for my rear end to rotate?

------------------
"Somedays your the dog, and somedays your the fire hydrant!!!"

www.geocities.com/albertson28racing

sbateman
Member
posted May 20, 2003 10:04 PM
call me crazy but i sure would check them shocks ,i had the same problem once


mod4
Member
posted May 20, 2003 10:20 PM
check your stagger right after the feature, and your tire pressures.
Just another opinion, your starting tire pressures sound really high for dry slick to me.
We run @ 2500# here in FL ... and I use
10LF 14RF
10LR 14RR on a tacky track
(which isn't often here)
and
8LF 12RF
8LR 12RR on a slick track.
I use RR sidewall wear to tell me more or less pressure.


LITTLEMAN
Member
posted May 21, 2003 12:01 AM
I'd say your problem is not enough left side weight.What percentage do you run is it swing arm or a 3 link suspension?


Wheels47
Member
posted May 22, 2003 06:36 PM
Wheels-----ITS A SWINGARM car. LOL SOmetimes wheels has short memory. My mother says he has selective hearing.
Thanks for all the great ideas guys but unfortunaltely it was none of the above posted problems. I will let wheels tell the story since he was involved with the error.

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"Somedays your the dog, and somedays your the fire hydrant!!!"

www.geocities.com/albertson28racing

Wheels47
Member
posted May 25, 2003 08:44 AM
yeah, somebody else has done it....