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Drag radial air pressure #1670519
09/13/14 11:04 AM
09/13/14 11:04 AM
Joined: Jan 2003
Posts: 11,701
Portage,michigan
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B3422W5 Offline OP
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B3422W5  Offline OP
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Joined: Jan 2003
Posts: 11,701
Portage,michigan
Stock suspension A body
Intermittently spins on the hit. Running 19 pounds. Go up or down?
Car went 1,66, 1.65, then 1.79 in elims last night. Same technique, leave at 1500 off foot.


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: Drag radial air pressure [Re: B3422W5] #1670520
09/13/14 11:56 AM
09/13/14 11:56 AM
Joined: Oct 2003
Posts: 11,678
W. Kentucky
justinp61 Offline
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justinp61  Offline
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Joined: Oct 2003
Posts: 11,678
W. Kentucky
17-18 worked best for me 275s and 315s.

Re: Drag radial air pressure [Re: justinp61] #1670521
09/13/14 01:42 PM
09/13/14 01:42 PM
Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
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MRMOPAR622 Offline
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Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
What Drag Radials are you referring to Street Drag Radials or Slicks Drag Radials?On my Street Legal Nitto's 305 Drag Radials I run 18 lbs last time next time I get the chance(plan on going to a T&T) I will lower the air pressure by a 1/2 pound at a time to see if it helps.A trick I have found on my Street Drag Radials is they will hook better if I put put 10-15 miles of hi-way driving on them and get them good & Hot.
PS With the Street Legal Drag Radials it is more important to have the correct rim width than with a slick.

8269167-DRT006.jpg (47 downloads)
Last edited by MRMOPAR622; 09/13/14 05:27 PM.

"To Be The Man'You Have Got To Beat The Man" "T/D and Pro-Bracket Racer"
Re: Drag radial air pressure [Re: MRMOPAR622] #1670522
09/13/14 03:06 PM
09/13/14 03:06 PM
Joined: Jan 2003
Posts: 11,701
Portage,michigan
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B3422W5 Offline OP
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Joined: Jan 2003
Posts: 11,701
Portage,michigan
It's a Hoosier drag radial/ slick. Just two grooves.
Lowered to 17.5 from 19. Moved laugh rpm up 500 rpm and netted personal best in this car 11.84 with 1.65 60 foot. Gonna leave it alone and see I can get some consistency now


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: Drag radial air pressure [Re: B3422W5] #1670523
09/13/14 06:00 PM
09/13/14 06:00 PM
Joined: Feb 2003
Posts: 1,942
Metro Detroit
OUTLAWD Offline
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OUTLAWD  Offline
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Joined: Feb 2003
Posts: 1,942
Metro Detroit
I worked my way down fro 22 to 17-18 in my 325's last time out, seemed to work good.

Might head to to Milan tomorrow for some T&T...going to try out a 950 and going to play with timing


Faster, Faster until the thrill of speed overcomes the fear of death...

71 Swinger - slowly collecting dust/parts
66 Belv. II - just a streetcar
88 Mustang - turbo LS beater
Re: Drag radial air pressure [Re: B3422W5] #1670524
09/14/14 01:27 AM
09/14/14 01:27 AM
Joined: Jun 2010
Posts: 3,112
LONG ISLAND
fishy340 Offline
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fishy340  Offline
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Joined: Jun 2010
Posts: 3,112
LONG ISLAND
Everyone I know in Ultra and X275 says and uses 17lbs, if that's not working tweak ur suspension but leave them @ 17 no matter what.JMO

Re: Drag radial air pressure [Re: fishy340] #1670525
09/15/14 02:48 AM
09/15/14 02:48 AM
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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StealthWedge67 Offline
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StealthWedge67  Offline
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
I run my 255 M/T's at 18 lbs. 1.63 short time is what I typically see on a good run.


LemonWedge - Street heavy / Strip ready - 11.07 @ 120
Re: Drag radial air pressure [Re: StealthWedge67] #1670526
09/15/14 02:54 AM
09/15/14 02:54 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
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Joined: Jun 2003
Posts: 52,972
Romeo MI
Every car will want something different... if you have
2000 lbs on the back it WILL take more pressure to
hold the same surface area... vs 800 lbs on the back

Re: Drag radial air pressure [Re: MR_P_BODY] #1670527
09/15/14 12:28 PM
09/15/14 12:28 PM
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt Offline
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1967dartgt  Offline
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
I had 17 in mine when it went on the bumper at monster mopar. And like Andy said you can go to most x275 or ultra teams and they will be in the 17-18 psi range. It doesn't seem the stiff side walls care about how much you car weights.


Brett Miller W9 cnc'd heads
STR Chassis fabraction
Re: Drag radial air pressure [Re: 1967dartgt] #1670528
09/15/14 02:33 PM
09/15/14 02:33 PM
Joined: Jun 2004
Posts: 2,110
toledo, ohio
plasticfantastic Offline
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plasticfantastic  Offline
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Joined: Jun 2004
Posts: 2,110
toledo, ohio
15# in ours, 1.21 60',

Re: Drag radial air pressure [Re: plasticfantastic] #1670529
09/15/14 02:41 PM
09/15/14 02:41 PM
Joined: Jan 2003
Posts: 11,701
Portage,michigan
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B3422W5 Offline OP
I Live Here
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Joined: Jan 2003
Posts: 11,701
Portage,michigan
I managed to get the 60 ft as good as 1.639 with air at 17.5 pounds, which is good for a heavy 11.80 car basically, but it's far from repeatable pass after pass.
Car has currently a big rake to it( 24 inch tall tires that were on the front when I bought it).And battery is still in front.
Gonna put 26 inch tire on front and move battery over winter. With low power of car, I get the feeling rear tire is kind of skidding and not planting well. The above stuff should help, but might need better shocks too.


69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, 10.40 @127 1/4
1.41 best 60 foot
6.60 at 103.90 1/8

Re: Drag radial air pressure [Re: B3422W5] #1670530
09/15/14 04:10 PM
09/15/14 04:10 PM
Joined: Dec 2006
Posts: 1,178
Indy
FlyFish Offline
super stock
FlyFish  Offline
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Joined: Dec 2006
Posts: 1,178
Indy
Yup, I would start working on the suspension...my car is going 1.43's now on that same Hoosier drag radial tire with 18-19 psi and repeats like a broken record.


67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....
Re: Drag radial air pressure [Re: FlyFish] #1670531
09/16/14 11:28 AM
09/16/14 11:28 AM
Joined: Sep 2003
Posts: 1,138
San Angelo, Texas
W8n2DustU Offline
super stock
W8n2DustU  Offline
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Joined: Sep 2003
Posts: 1,138
San Angelo, Texas
18# in mine. Went 1.12-60' @ 3508#. Just got 100# out of the car.


2010 Toxic Orange Challenger built by B and B Racecars! All aluminum R4/P5 engine, Proformance TH400 (3 speed) tranny, full Reid case, nodular 9" rearend, full Dragpak suspension, Protorque custom converter, BS3, PTE 85mm turbo, fire core wires, carbon doors, carbon front clip, and a whole lot more!






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