Car bogging from too much bite

[chad17]

How can I get my car to have less traction. I am running a crate on a tacky gumbo track and I can't get the car to quit bogging.

[jedclampit]

What rpm are you at when it bogs down, cornering or on starts , 602 or 604.
pm me

[Matt49]

Are you getting too much side bite?
Even a 602 should have no problems launching a 2300 pound car when it is tacky unless you have carburetion issues.

[leeroy]

Same issue here, kills us on qualifying when track is wet. Would love to hear some thoughts on this.

[Graff Spee]

Put more gear in it!!!!!!!

[drtrkr244]

Take j-bar angle out, even to the point it is running down hill to frame.Be sure to keep rearend in same position according to mfr.

OR, take out rear % till you make it loose, but you may have to put it back for the feature.

[leeroy]

In our case, the car handles well, driver says it just does not have as much forward drive in wet. Have noticed that the lower corner of the right
door just behind right front wheel gets into the track when it's wet. So taking some J-bar out could help both conditions?

[Matt49]

For just about any low HP application, you're going to need to do some things to free the car up from the "baseline" setups from the manufacturer. Those baseline setups, unless stated otherwise, assume 800HP to help turn the car.
J-bar is a great place to start and also consider trailing RR some but do your homework on the scales before you get too crazy with it.

[Matt49]

In our case, the car handles well, driver says it just does not have as much forward drive in wet. Have noticed that the lower corner of the right
door just behind right front wheel gets into the track when it's wet. So taking some J-bar out could help both conditions?

Taking j-bar angle out will free entry but can tighten exit because the LR tire stays loaded more.
How much shock travel are you getting in the RR as compared to your RF? Your car could just be out of balance for the track conditions. If your RR is squatted too much you are removing all thrust angle in that corner and the car is going to drive almost entirely off the LR making it very tight.
There are several ways around this. Could be as simple as raising your ride height or using a little bit stiffer spring or you might have to consider adding some compression and taking rebound out of the RR shock. Those shock adjustments will help hold the RR up and free entry just a bit and allow the RR to drive up off the bars more under acceleration which will free exit. Depends on what it needs but those are just some ideas.

[dualdj1]

And if you're going to take j-bar angle out, go up on the pinion, not down on the frame.

[HuckleberryB4]

And if you're going to take j-bar angle out, go up on the pinion, not down on the frame.

Why do you suggest this rather then at the frame?

[junebug]

we raised lr lower bar up at a test session and car started bogging down on exit....so maybe try taking a little lower bar angle out in the tack if its bogging to much

[Matt49]

we raised lr lower bar up at a test session and car started bogging down on exit....so maybe try taking a little lower bar angle out in the tack if its bogging to much

With a spring behind??? Increasing left lower bar angle should make the car freer on throttle and off the corner. While it does increase thrust angle which would tighten the car the more predominant effects are decreased rear steer and increased birdcage indexing into the spring behind. Increasing the left lower bar angle is a common fix for a throttle push condition.

[junebug]

the car did tighten up as far as being tailed out and rotating but whenever we had lower bar up it made more chassis lift and even smashed lr tire in the ground harder in pics

[sj valley dave]

With the LR spring behind, raising the LR lower bar should free the car up...lower bars are your "steering" bars...the increased rear steer will overcome any additional angle...When it goes dry and we want forward drive we drop the LR lower bar down

[dualdj1]

Why do you suggest this rather then at the frame?

going up on either end of j-bar raises the roll center, which means less weight transfers right and will loosen the car. taking rake out applies less force which loosens. So you can go down on the frame, but it has less effect than going up on the pinion, since down lowers the roll center.

http://www.afcoracing.com/tech_pages/panhard.shtml

caveat: If you have a lot of roll steer in your bar settings, going up with roll center can potentially tighten the car, and going down can loosen it. Just bear that in mind.