air pressure in rear slicks

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air pressure in rear slicks

Postby chevy art » Thu Jul 01, 2010 11:48 pm

i run goodyear slicks on my 67 nova. they are 31x14x15/ i use tubes in them and they are pinned. i usually run around 11 to 11 1/2 lbs air in them. one time i ran 10 1/2 lbs of air and the car felt a little shakey before the eigth mile and i dont remember on top end by quarter if i had made the complete pass or let off. how muck lower (than 11 lbs) could i go with air pressure. any real time experience out there with this important question thanks art
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Re: air pressure in rear slicks

Postby Ishiftem » Fri Jul 02, 2010 1:49 am

I knew a guy with a top alcohol dragster and they ran 4.5 pounds. Probably doesn't relate to a heavier door car, just throwing it out there. A lot of people are switching to radials because they are more stable on the big end.
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Re: air pressure in rear slicks

Postby cosvega76 » Fri Jul 02, 2010 10:15 am

A friend of mine used to run a '64 Nova with 30x14 slicks running low 10s. He would run between 4.5 and 6 psi in them. He ran both Goodyears and Hoosiers. He liked the Hoosiers better. This was almost 20 years ago ( :shock: ) now.

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Re: air pressure in rear slicks

Postby spencerforhire » Fri Jul 02, 2010 11:22 am

Drag slick air pressure is usually a compromise between maximum contact patch and top end "wobbles". This would indicate that those among us with large gonads might get away with less pressure :wink:
The "fleet"-
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
76 Vega GT- 400/4spd/9" retired from active duty(rusty)
03 Silverado 2WD ex.cab (work truck/parts hauler)
04 Silverado 2WD ex.cab (retired)
06 Haulin' 20ft enclosed car transporter
93 Suburban- 350/4L60(retired)
00 Saturn SW2- wife's car
01 Saturn SC2- younger son's project
00 Saturn SL2- daughter's car
98 Saturn SW2- spare
and 3 more Saturn "parts cars"
Note- the very act of listing all of these has made me realize I have some kind of problem.....

Visit http://www.spencerforhire.ca
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Re: air pressure in rear slicks

Postby chevy art » Fri Jul 02, 2010 6:58 pm

thanks guys i may try 10 1/2 lbbs, maybe even 10 lbs next week and see what happens, maybe its like going swimming or ice sh=kating for the first time you are real scarred and then you wonder why you didnt do it sooner.ill let you all know if i survive the day art.. spence how far are you from say caribou maine. just curious art
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Re: air pressure in rear slicks

Postby spencerforhire » Fri Jul 02, 2010 9:05 pm

Art- I've actually been to Caribou Maine! It's about a 6.5 hour drive from Halifax. Back in the 70's I had a girlfriend from Bath New Brunswick, about 25 miles southwest of Caribou; that place is waaaay out in the "boonies"!
The "fleet"-
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
76 Vega GT- 400/4spd/9" retired from active duty(rusty)
03 Silverado 2WD ex.cab (work truck/parts hauler)
04 Silverado 2WD ex.cab (retired)
06 Haulin' 20ft enclosed car transporter
93 Suburban- 350/4L60(retired)
00 Saturn SW2- wife's car
01 Saturn SC2- younger son's project
00 Saturn SL2- daughter's car
98 Saturn SW2- spare
and 3 more Saturn "parts cars"
Note- the very act of listing all of these has made me realize I have some kind of problem.....

Visit http://www.spencerforhire.ca
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Re: air pressure in rear slicks

Postby chevy art » Sat Jul 03, 2010 1:32 am

spence i was at loring air base from 1964-1966.. i going up that way this summer for a visit. any drag strips up that way art
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Re: air pressure in rear slicks

Postby tzoom » Sat Jul 03, 2010 7:58 am

The Loring Timing Association is using the old base for land speed racing http://www.lta-lsr.com/HOME.htm. They have an event the weekend of July 31/August 1.
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Re: air pressure in rear slicks

Postby Rickracer » Sat Jul 03, 2010 10:02 am

Got 9x28 Hoosiers on 15x7(?) S10 4x4 wheels, I run 10 psi cold, and I believe I'm right at the low limit. A wider wheel and tire, especially a tire and wheel that's closely matched as far as width, will work on considerably lower pressure though. I've run as low as 8 psi on McCreary GT series dirt tires on the street. :wink: 8)
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ASE Master Auto Technician, 36+ years
'76 Vega Notchback, Twin Turbo 355/TH350 (soon to be a Powerglide w/Brake), 4 link, Koni Coilovers, 3.50 geared 9" w/Spool & Moser Axles, drag only, best all motor 1/8 mile pass to date, 6.90@99mph, 6.57@107.0 on a 60 shot, Best 1/4, 9.66@139.78, still tuning...
Project Album: http://s68.photobucket.com/albums/i4/Ri ... 20Begins/'
93 S10 RCSB, Hyd. Roller Vortec head 363 ci SBC, 2800stall lockup 700R4, LS Front Brakes, Narrowed F*rd Exploder 8.8 disc brake 3.73 posi rear, 8.0s@89 mph, (all motor, haven't sprayed it yet...)and tows the Vega to the track too
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Re: air pressure in rear slicks

Postby spencerforhire » Sat Jul 03, 2010 10:54 am

Art- The Dragstrip in Mirimachi N.B. runs every couple of weeks and is only about 2.5 hours(150 miles) due east from Caribou. Here's a link to their website/schedule- http://www.miramichidragway.com/schedule.html
look in the schedule for an "ADRA" event; there will be cars from all over Atlantic Cananda there chasing points.
If you want to drive a bit further, here's the schedule for all the ADRA tracks- http://www.maritimedragracing.com/id19.htm
Some of these other tracks are quite far from Northern Maine; The next closest one in Prince Edward Island is easily 5-6 hours away.
I'm pretty lucky in that I'm less than 2 hours from my closest track in Greenfield Nova Scotia, and my cottage at the other end of the province is only a half an hour from Cape Breton Dragway.
The "fleet"-
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
76 Vega GT- 400/4spd/9" retired from active duty(rusty)
03 Silverado 2WD ex.cab (work truck/parts hauler)
04 Silverado 2WD ex.cab (retired)
06 Haulin' 20ft enclosed car transporter
93 Suburban- 350/4L60(retired)
00 Saturn SW2- wife's car
01 Saturn SC2- younger son's project
00 Saturn SL2- daughter's car
98 Saturn SW2- spare
and 3 more Saturn "parts cars"
Note- the very act of listing all of these has made me realize I have some kind of problem.....

Visit http://www.spencerforhire.ca
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