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January 7th, 2003, 11:24 AM
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Why are my tires always blown away 20' out?
Every run I have ever made has been foot to the floor, and I have spun the tires every time before the 60' mark.
I think its a combination of the suspension unloading and the boost peaking at 22psi. I want to do full throttle launches, no feathering Now I have boxed LCAs, stock uppers, a pass side airbag, 275/50 DR's, and a stock posi. Unfortunately I only made one run with the LCAs and airbag before I blew a head gasket, so I didnt get to experiment with any air adjustments Since I am not spinning off the line I think this is what is killing my short times. Any advice would be appreciated
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Bob D .040 over block - n/a crank - hypers stock turbo/IC/blue tops Yes, I am an alcoholic http://bobdittmar.tripod.com/blown87combobs1987buickgrandnational/index.html     
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January 7th, 2003, 11:46 AM
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i have the same problem. i think it has to do with launch boost. the more boost you can leave with the more the tires will plant from the start and max hp is made while the car is still squatting.
getting the DRs to stick (launch) at higher boost pressure is pretty tricky. i may go to the 28" BFGDRs to help. drew
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86 T-type, TA-49, 50#MSDs,16pos Max Effort, SMC Progressive Alch injection, Hot wired walbro 307,adj regulator, 9x11 TC, Art Carr (CPT) transmission, bigmouth cold air, power plate, big neck stock IC, ATR 3in DP with external WG,Poston headers, SS exhaust w/o cat, scanmasterII, BSTC, VDO boost guage, nitto 275/50/15 DRs, air bags, Poston LCAs, Motor currently being rebuilt. ETs with bluetops 12.4 @106 1.8 60ft (LACR 1/4) 7.77@87 1.7 60' (irwindale 1/8) 13.1 @109.5 (slippery fontana 1/4) Last edited by Drewster : January 7th, 2003 at 01:36 PM.
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January 7th, 2003, 06:00 PM
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Do you have a pinion snubber? I removed mine and it made a noticible difference.
Remove your front sway bar, and launch away!
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86 TR Leather,column,astroroof T-netics 66BB S-trim, ME-R Razor dual nozzle alky, 75lbrs, Powerstroke IC 210/215 roller, Forged stroker, TA headers, HR Bar Lonnie Diers Stage 2, PTC 9.5 N/L 10.71 at 129mph 6.9 at 102mph 1.67 60ft 10.79 at 114mph 6.8 at 102mph 1.58 60ft 3700lbs w/driver
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January 7th, 2003, 09:20 PM
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Hey Bob, Have you read my Launching a Drag Car web site? There is so many things that I can think of but most of them are on my web site and they may give you some ideas
 In a nutshell: Front shocks reaching full extension then slightly collapsing before full boost comes on. This unloads the tires. Bad control arm geometry (I know this is a tough one to solve). Rear shocks too soft, etc...
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Tech Page,~~Launching a Drag Car,~~BaselineSuspensions.com~ ~Project F150~ Suspension Moderator @ Hardcore50 Diary of a GN 87 GN 12.05 @ 111, 1.60 60', 15psi launch New mods: 12.16 @ 109- Best 60' 1.60 @ 22-23psi Stock Turbo Stock IC w/ stock neck MaxEffort
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January 7th, 2003, 10:32 PM
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Kevin I have checked out you website a couple of times, and you have some much info on there it is mind boggling
 Next time I will be removing the front sway bar. Had too many other things to fix last time at the track. I have the stock pinion snubber, I dont even think it hits but who knows I dont want drag shocks, since my car is 95% street machine. An ATR swaybar will probably be in the mix also. I was just curious since I see quite a few guys doing better than I am on a stock suspension, but I know they probably have a lot more passes under their belts
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Bob D .040 over block - n/a crank - hypers stock turbo/IC/blue tops Yes, I am an alcoholic http://bobdittmar.tripod.com/blown87combobs1987buickgrandnational/index.html
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