Adding forward and side bite

[JustAddDirt]

I do not run a lot of wedge. at full drop I think I am at 1.25"-1.5" preload on lr spring.
generally about 25"#with driver.
All I feel with more wedge is a looser corner entry if you have to get off throttle, and a bit tight, when you pick throttle up if you are totally off throttle.
once the car is against limit chain, the LR spring, and the amount of wedge mean nothing

[mod88s]

By switching your springs, it will help achieve what you are thinking. Thats what I run for the last few years and I like it. 175 LR and 200 RR

[powerslide]

All I feel with more wedge is a looser corner entry

I highly agree with this, we practiced one night after the races and it was slick and the driver swore up and down he needed more drive off and he was going to add 100lbs of LR. All he did was spin out on entry after doing it. He was not a trail braker.

[ambonci21]

made the switch from 15" 200 LR and 13" 175 RR to a 16" 175 LR and 15" 200 RR. We scaled tonight and have about 1.5 " of preload in LR slider. kept some tilt in the car and went with around 67 LBS LR bite. We race tomorrow. last time we ran at this track we finished 2nd earlier this year, finished 3rd last year the one time we went. We will see how things go tomorrow. the driver absolutely loves this track as its super fast. Will let you know the results. Thanks for all the input.

[ambonci21]

well the car was absolutely junk Super loose from the middle off. spinning like crazy. so the only thing we changed from this time an the last two times we went there were the year springs. LR bite was within 5 pounds of those previous times. From the middle off there was a major lack of sidebite. I am wondering if the right rear spring is to tall. the car looked to have a completely different attitude in pictures, before it would definitely lay on the rr, after the spring change its not on the rr very much or any at all.

[JustAddDirt]

I ventrure to say that you have more problems than rear springs rates.
things to double check:
binding in j bar
birdcages rotate easily
how far below axle centerline is your RR shock mount
how much split in J bar mounting
where are you on pinion for j bar mounting
how long is your j bar


does car trip onto RF when entering corner (stand up on LR & nose over on FR and stay there?



my car rolls more with the 225 than it does a 200, which means it is planting car harder on RR.

[ambonci21]

Just add dirt, the jbar is almost buried at the pinion. not sure on the jbar split. I was not there Saturday but the pictures look like its stood up on the lr and nosed on the rf. I will try to send you a link to the picture. Its just odd that the only thing we changed were rear spring rates and spring heights.

[ambonci21]

I tried to PM you but your inbox is full.

[JustAddDirt]

cleaned out.

[stock car driver]

you say early on in reply to someone your 3/8 forward on the rearend, id trail that.... that will cost you side bite and forward drive. 3/8 trail would be LOW....

once you do that youll probably be able to raise your rr lower as well as any other stuff you have off from the base set up that is being used to try and fix or mask the fact that your rr is forward

[JustAddDirt]

too much pandard bar angle will hurt forward bite.
car is laying on the j bar and not going forward.
with it buried on pinion, I bet car is tight on entry, then driver pops it loose to rotate center,and there is no traction from there.

and if you indeed are short on right side wheelbase, that will cause more of a tight condition, and car will not want to rotate.

[stock car driver]

and if you indeed are short on right side wheelbase, that will cause more of a tight condition, and car will not want to rotate.

if hes making it around the track with it 3/8 lead then hes clearly busting it loose to turn

thats first thing he needs to fix

4 bar cars are easy to get traction, you can get all of it you want any place you want it easily.

[ambonci21]

we are around 3/8 shorter on the right side than the left. we usually have both right side bars low as they go and left lower as low as it will go. last year we ran this way and was a top three car all year long. and ran it like that this year will lots of back luck. the only major thing we have changed are the rear springs. I believe there is something else going on but car went from god to total garbage with a spring change. I can provide more info if needed.