rufretic

iTrader: (37)

My setup is doing pretty well, but my 60' could use a little improvment. On sunday I went to the track for the first time with my new setup and my 60' stayed the same. Changes made were 12 bolt, 4.11s, bogarts, hoosier QTPs 11.5x27, about 100lbs off the front end and lca relocation brackets. I still couldn't do better than a 1.61 60' I have around 400rwhp and a 4000 stall. It seems to hook and pull the front end up and then it jerks a couple times and then goes. I'm brake stalling to 3000, my shocks are set to 1 in front and 5 in back and I'm in the lowest hole on the relocation brackets. I never had wheel hop with my old setup but I think that might be what I'm getting. Is it possible I'm hitting the rear tires too hard causing them to bounce? What kind of adjustments should I try to get it to dead hook? The pic in my sig is right before the wheel hop I'm trying to describe. I think my setup should be good for at least 1.5s. Can any of you susspension guys give me some advise? Everything on my setup is adjustable, I just don't know what to adjust. Last thing, my pinion angle is -2. TIA for any help.

MADMAN

iTrader: (4)

I would start by stiffening the rear shocks. IF you are getting wheel hop that will stop it. Go one click at a time till it goes away.
How much air is in the tires??

mike#9

iTrader: (3)

If you are hopping...maybe try coming out a little harder...or a little softer for that matter. You are probably in that zone between bogging and breaking lose.

I had it happen to me last night, and i came out a little harder and made a much better pass!

12secSS

iTrader: (30)

I would also place your LCAs at the middle hole of the relocation brackets. This will have a closer to ideal angle on the LCA for traction. I tried it and noticed a .1-.15 second drop in 60' times. You may want to try this out if the other suggestions don't pan out.

Shon Herron

iTrader: (25)

This change in LCA position, were you dead hooking before and made the change and gained that much?
I do not have problems hooking at the tracks my car goes to but do have the relocation brackets sitting on the shelf waiting to go on but so far I have not seen the need for it.

Also, how much tire pressure do you have and usually if the car is wheel hopping we leave harder, works every time!

blkchevyz

that worked for me, i had mine in the lowest hole and it would just smoke the tires. moved it up, next pass pulled a 1.62

rufretic

iTrader: (37)

The tire presure was at 14psi. Thanks for all the good advise so far.

12secSS

iTrader: (30)

The car would spin the tires and would 60' a best of 1.61. After I read Brian's (Madman) comments on LCA angle, I decided to change the position and the next time out it went 1.45 lifting the front end. Tire pressure for us is around 12 PSI depending on the track conditions. Mind you, everything else needs to be setup properly as well, our LCAs were "binding" against our TQ arm I suspect. Proper supension geometry is crucial!

TheBlueGoose

you may be "wadding up the tires" causing them to accually overlap itsself or hince hopping or sliping. have some one look at you tracks and see if they are wavy. if so, add air

rufretic

iTrader: (37)

Thanks everyone. Now I have some testing to do. Since my car isn't lowered, I think I can go up to the next hole in the relocation brackets. Then I'm going to start with 18psi and rear shocks on 6. This way if I'm still having some issues, I can adjust the shocks until there is no more wheel hop. Then if I'm spinning I can try letting some air out of the tires. Hopefully I can get it just right. I'll post up in here after I get some results.

Shon Herron

iTrader: (25)

18PSI, what tires? we use that PSI to load it up on the trailer, first pass is at 15PSI or 12.5PSI (depending on who is running the tire gauge).

rufretic

iTrader: (37)

Hoosier QTPs. I thought it was best to run as much air as you can while still being able to hook. I had them down to 14 on sunday but since I'm trying to figure out some other issues, I figured it would be good to start a little higher and then once the wheel hop is gone and I'm spinning a little, I can then lower them until I get the best results.
Oh, and by the way, no trailer here. I drive it the hour and half to and from the track .

12secSS

iTrader: (30)

Correct! It is best to have as much air as possible without hindering traction. It is not a good idea (on any tire) to run a low PSI just because. See what works for you and you will be good.

Shon Herron

iTrader: (25)

Compromises suck
I used to do that and decided leaving some on the table was no fun so we got a trailer and use it.

rufretic

iTrader: (37)

Well I ran it last night with the lcas in the next hole up. It got rid of the wheel hop but now it just spins. Shocks in back were at 6 and had the psi down to 13. I only got to make 3 passes so didn't get to try to many different settings. My last pass I did get an all time best ET but only with a 1.74 60'. If I could get this thing to hook it would be good for low 11s. I wish I had a track closer because I need to test more, driving an hour and a half for 3 passes sucks. Oh well, at least I have a new best and I'm very happy the cars running as good as it is for a cam only setup.

If anyone thinks they can help me to get that 60' down please do, I'm willing to try anything to get it to hook right.

Shon Herron

iTrader: (25)

What is the 'attitude' of the car when it launches? does it squat, roll, lift off the rear tires (guessing not). Pix or vid help alot in this or some good friends to watch it.

Navy David SS

iTrader: (13)

If it was me - and it was - listen to Brian (MadMan). He's done a "few" suspension set ups over the years. You move your relocation bracket back, than your shock settings and tire pressure. One thing at a time. You changed 3 items - relocation, tire pressue, shock settings - you have now no clue what to change to get it to hook again. Put it back to the way you had it. Go out make a run. If it still dead hooks, increase the tire pressure 1lb. Make another run. Do 1 setting at a time until you get it where you want it. If you don't hook, at least you'll know what it doesn't like. Also, track conditions change. Most - not all - set their fronts at 3 and rears at 6 to start. You want ideally, the rears tires to spin about a 1/4 turn and than hook

Good luck.

David

TXCAMSS

iTrader: (60)

TTT

I didn't think any spin was good. Maybe for a M6 car to prevent bogging down maybe?


Hmmm?

Mike TexaSS

iTrader: (2)

If your tire dead hooks at the hit you could end up in a wheel stand you weren't prepared for. The tire is going to turn itself over at the hit. Usually it's about half a turn. It generally occurs when the rear end throws itself into the ground and the slick wadds up.

rufretic

iTrader: (37)

That sounds like a good idea. It was hooking good before, I just didn't like the wheel hop and a lot of people say the second hole in the relocation bracket is the best. I think I'm going to take your advise and set it back the way it was and stiffen up the rear shocks. Hopefully I can get more passes this weekend to test it out and play with the shock settings.