MasterSbilt Entry Push

[citiracer]

Tire pressures are
8 10
6 8

Car is up on the bars going in but falls a little if I use the brake.

[racin29]

that might be too soft on the front try going up to 10lf 12rf should help the car turn more positive might just be the right front is to squishy and the tread is loosing contact

[JB1K]

I read somewhere that standing the RR shock up (more towards vertical) will loosen it up on entry. My car has two different upper mounting points but I havent tried this yet.

[rubbinsracin]

I read somewhere that standing the RR shock up (more towards vertical) will loosen it up on entry. My car has two different upper mounting points but I havent tried this yet.

be careful with this, because standing the RR shock up can cause the car to "skate" up the track. youre pressures all the way around seem a little low. we run LF 10 RF 12
LR 6 RR 10

[dualdj1]

I read somewhere that standing the RR shock up (more towards vertical) will loosen it up on entry. My car has two different upper mounting points but I havent tried this yet.

This is correct to an extent. It moves your moment center (roll center) right, which means your car tries to roll over less, which transfers less weight to rr, which loosens. but when you roll less, yes it can skate up on you if you don't have good traction at the wheels.

Rear MC lateral location (left to right) exists halfway between chassis spring mounts. If you want more or less roll, adjust your mounting point. Otherwise leave it alone.

[grt74]

i see said the blind man after seeing the air pressures your running go up on the rr until it fixes the problem i would start at 10 or 11 psi, if it helps some but you need more go up some more

[citiracer]

Okay we might try the air pressure but I always thought of air pressure as more of a fine tuning thing. The problem we are having is far from something that a fine adjustment is going to fix. Am I missing something?

[racin29]

yes you are right tire pressure is a fine tuning thing but it looks like your tires are so soft that they are flexing too much and loosing contact you have to still be at a zero to adjust and you are below zero, two pounds is also alot on these tires(2 pounds on a 10 pound tire is 20%) just give it a try in hotlaps go up two pounds everywhere(to keep stager the same) if it doesnt do anything you can call me bad words when you get home

[citiracer]

yes you are right tire pressure is a fine tuning thing but it looks like your tires are so soft that they are flexing too much and loosing contact you have to still be at a zero to adjust and you are below zero, two pounds is also alot on these tires(2 pounds on a 10 pound tire is 20%) just give it a try in hotlaps go up two pounds everywhere(to keep stager the same) if it doesnt do anything you can call me bad words when you get home

Hell I'll try anything once. It makes sense though when you think about it with the high banked deal and pressure being to low. We might just be getting way to much rubber on the ground on the RR.

[K15]

what engine combo do u have?? aluminum, steel block, all steel?? we run a steel block and run a 500 on the rf

[citiracer]

Motor is all steel (602 crate). 450 is the heaviest 12" spring we have right now.
At this point I think we're looking at the following options when we go back to this track on 7/16:
1) raise the j-bar up on both sides
2) lower the j-bar on the frame side
3) softer RR spring (200)
4) more air pressure in RR

[MasterSbilt_Racer]

Motor is all steel (602 crate). 450 is the heaviest 12" spring we have right now.
At this point I think we're looking at the following options when we go back to this track on 7/16:
1) raise the j-bar up on both sides
2) lower the j-bar on the frame side
3) softer RR spring (200)
4) more air pressure in RR

If this track has good banking and you are carrying some decent speed, all your tire pressures are a bit low. Your fronts may be rolling under real bad.

[citiracer]

Another note...we ran a big flat paperclip 1/3 mile this past weekend that required a lot of brakes getting into the corner. We could never get the car freed up enough on entry and I think this might be because we have the RR brake on the birdcage as opposed to the axle. Now our tight condition at the high-banked place was regardless of whether brake was being used to try to turn the car so I don't think that is the complete solution for that track but I want to try clamping the RR brake to the axle to free entry at places like the flat 1/3 mile where a lot of brake is needed. Does that make sense?

[MasterSbilt_Racer]

Another note...we ran a big flat paperclip 1/3 mile this past weekend that required a lot of brakes getting into the corner. We could never get the car freed up enough on entry and I think this might be because we have the RR brake on the birdcage as opposed to the axle. Now our tight condition at the high-banked place was regardless of whether brake was being used to try to turn the car so I don't think that is the complete solution for that track but I want to try clamping the RR brake to the axle to free entry at places like the flat 1/3 mile where a lot of brake is needed. Does that make sense?

Yes. That makes sense.