How to run a 30inch slick?

88workcar · 09-03-2003, 06:20 AM

I know that those stockers run some huge tires, cut low 1.4 and 1.3 60fts. What gear ratio goes with those big ol tires? I have 350+ hp plus 100hp NOS and a 2700lb car.

Dark_5.0 · 09-03-2003, 12:51 PM

I dont see why you would need to go bigger than a 28. We put 29's on a friends car and we had to massage the crap outta the car with a hammer.

I doubt you could run 30's without seriously altering your car.

JMO.

Coupe Devil · 09-03-2003, 12:55 PM

I think your biggest problem will be stuffin those big meats in the little holes we call wheel wells on our cars. I run 28 inch slicks for a while on 15x8 rims and had to "Clearance" the inner fender wells.. My 28 inch tires only measured 27 inches. Now maybe when doing a burnout or launch they expand to 28 inches....

As far as what gear those guys are runnin. Good question, one ive thougth about a hundred times.. Anyone know

Bradley

88workcar · 09-03-2003, 06:06 PM

I want the ET of the big tires, I would like to know the gear ratio to go with it?

'89GTStang · 09-03-2003, 07:00 PM

do your slicks break loose if you try launching too hard?

Dark_5.0 · 09-03-2003, 07:44 PM

Quote:

Originally posted by 88workcar
I want the ET of the big tires, I would like to know the gear ratio to go with it?

You can run just bas fast on 28's as you can on 30's.

I dont see the point.

You have 28's and 4.30's now right. You could go 30's and 4.56 gears but I think you would run the same.

JMO,

andy669 · 09-03-2003, 07:54 PM

With 20psi my 26x10's have a rollout of about 85 1/2 inches. Converting that to diameter, that works out to about 27 1/4. I really wouldnt want to speculate on how much a 28 or 30 inch tire rolls out, but if you could find out we could do the math.

When I selected my gear ratio I knew what MPH I needed to run, and what RPM (10% above peak power)I needed to run through the traps at. Knowing the rollout, the numbers calcaluate out to within 200 rpm of what I actually run.

Andy

lx mike · 09-04-2003, 07:17 PM

26" tires and 4.30 gears would equal 4.96 gears with the 30" tires. thats just using some basic auto math.

drtbiker · 09-04-2003, 11:32 PM

88 what are u planing now?

88workcar · 09-05-2003, 05:27 AM

The reson for this was this, If you look into stockers they run 11.30s, 3100lbs, 390hp, 29-30" tires. Well I am 2700lbs, 360+hp and just will go into the 11s. It dont add up. We come to find out the stockers turn over 7000rpm, thats where its at.

Kevin Price · 09-05-2003, 08:02 AM

Just to let you know, I ran 9.50's on a true 28 x 10.5 in a 2900lb car with no problems.

88workcar · 09-07-2003, 11:41 AM

I went Fri night. I ran with just the radials,
1. 12.46 @ 111.7 with a 1.94 60ft
2. 12.39@ 111.2 1.83 60ft
3.12.38 @ 111.42 1.82 60ft
4. 12.31 @ 13.03 1.83 60ft bumped the nos in 4th
5. 12.01 @ 114.22 1.89 60ft tried to gas off the line, spun bad, got on the rev limiter at 150 ft before the 1/4.
This was on a Grand Spirit Radial GT 275-60-15. My concern is this, I hit the rev limiter, so a tire or a gear change is in order. What should I do? The sad part of it all is that I never got a good start. With the same tires I have seen a 1.70 60ft.

jonnyk · 09-07-2003, 12:24 PM

A 275/60R15 is basically a 28 inch tire already, I'd be looking into a gear swap if you're banging the rev limiter.

andy669 · 09-07-2003, 05:22 PM

Why not bump the rev limiter up?

Andy

88workcar · 09-07-2003, 07:43 PM

How do I raise the rev limit?

andy669 · 09-07-2003, 08:24 PM

A chip. The only trouble is not many people have the software for the Speed Density computer, but I'll bet Chris Johnson does.

Andy

88workcar · 09-10-2003, 07:08 AM

I talked to Chris yesterday, he will only raise the rev limit for me. Tonight I will test a pair of 28" slicks.

09-03-2003, 06:20 AM	#1
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	How to run a 30inch slick? I know that those stockers run some huge tires, cut low 1.4 and 1.3 60fts. What gear ratio goes with those big ol tires? I have 350+ hp plus 100hp NOS and a 2700lb car. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

09-03-2003, 12:51 PM	#2
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	I dont see why you would need to go bigger than a 28. We put 29's on a friends car and we had to massage the crap outta the car with a hammer. I doubt you could run 30's without seriously altering your car. JMO. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

09-03-2003, 12:55 PM	#3
Coupe Devil Moderator Join Date: Mar 2001 Location: Myrtle Beach SC Posts: 1,643	I think your biggest problem will be stuffin those big meats in the little holes we call wheel wells on our cars. I run 28 inch slicks for a while on 15x8 rims and had to "Clearance" the inner fender wells.. My 28 inch tires only measured 27 inches. Now maybe when doing a burnout or launch they expand to 28 inches.... As far as what gear those guys are runnin. Good question, one ive thougth about a hundred times.. Anyone know Bradley __________________ 1990 GT, 347, TFS TW Heads, TFS Cam, TFS Track heat, Twin turbos, FMIC, T5. Built Ford Tough Moderator

09-03-2003, 06:06 PM	#4
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	I want the ET of the big tires, I would like to know the gear ratio to go with it? __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

09-03-2003, 07:00 PM	#5
'89GTStang Registered Member Join Date: Apr 1999 Location: greenwood, ar Posts: 118	do your slicks break loose if you try launching too hard? __________________ '89 GT K&N, Twisted Wedge heads, TFS intake,FMS 1.7 rockers, Trick Flow stage 1 cam(221/225 .530in\.542in) , 3.73's, headers, off road H-pipe, Flowmasters, FMS Clutch, Tremec, PRO-5.0, FMS driveshaft, fluidyne alum. radiator, and more to come.

09-03-2003, 07:54 PM	#7
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	With 20psi my 26x10's have a rollout of about 85 1/2 inches. Converting that to diameter, that works out to about 27 1/4. I really wouldnt want to speculate on how much a 28 or 30 inch tire rolls out, but if you could find out we could do the math. When I selected my gear ratio I knew what MPH I needed to run, and what RPM (10% above peak power)I needed to run through the traps at. Knowing the rollout, the numbers calcaluate out to within 200 rpm of what I actually run. Andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

09-04-2003, 07:17 PM	#8
lx mike Undescribable Join Date: Sep 1998 Location: Ft Myers Fla Posts: 1,539	26" tires and 4.30 gears would equal 4.96 gears with the 30" tires. thats just using some basic auto math. __________________ Rice Haters Club Member #101

09-04-2003, 11:32 PM	#9
drtbiker Registered Member Join Date: Jan 2002 Location: Mt. Prospect,IL Posts: 474	88 what are u planing now? __________________ 87-ford-mustang-SOLD! mods: 3:73's, off road h-pipe, b303 cam in gt- 40 motor w/ Power Plus intake, edelbrock 70mm tb & egr spacer, 72mm C&L, bbk long tubes, tremec tranny, centerforce dual friction clutch, upr and lwr CA's 255lph FP and soon more to come.... when i have money again SOME ADVICE Don't do burn outs in reverse it is very expensive New times with dead hook on dr's 13.27@103 with 2.0 60 foots w/100lb system Fastest time to date: 12.8@113

09-05-2003, 05:27 AM	#10
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	The reson for this was this, If you look into stockers they run 11.30s, 3100lbs, 390hp, 29-30" tires. Well I am 2700lbs, 360+hp and just will go into the 11s. It dont add up. We come to find out the stockers turn over 7000rpm, thats where its at. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

09-05-2003, 08:02 AM	#11
Kevin Price Registered Member Join Date: Jan 1999 Location: Oxford, KS Posts: 935	Just to let you know, I ran 9.50's on a true 28 x 10.5 in a 2900lb car with no problems. __________________ 2001 Mustang "Mach 1" SVO siamesed 351 stroked to 417ci,Yates heads, solid roller,Trans King glide. Best 1/4 ET 9.17 (ALL MOTOR) Best 1/4 MPH 147 My Car

09-07-2003, 11:41 AM	#12
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	I went Fri night. I ran with just the radials, 1. 12.46 @ 111.7 with a 1.94 60ft 2. 12.39@ 111.2 1.83 60ft 3.12.38 @ 111.42 1.82 60ft 4. 12.31 @ 13.03 1.83 60ft bumped the nos in 4th 5. 12.01 @ 114.22 1.89 60ft tried to gas off the line, spun bad, got on the rev limiter at 150 ft before the 1/4. This was on a Grand Spirit Radial GT 275-60-15. My concern is this, I hit the rev limiter, so a tire or a gear change is in order. What should I do? The sad part of it all is that I never got a good start. With the same tires I have seen a 1.70 60ft. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

09-07-2003, 12:24 PM	#13
jonnyk Being stroked is great Join Date: Oct 1998 Location: Alberta, Canada Posts: 772	A 275/60R15 is basically a 28 inch tire already, I'd be looking into a gear swap if you're banging the rev limiter. __________________ Novi 2000 now spinning off the snout of the 331... Mods Pics

09-07-2003, 05:22 PM	#14
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	Why not bump the rev limiter up? Andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

09-07-2003, 07:43 PM	#15
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	How do I raise the rev limit? __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

09-07-2003, 08:24 PM	#16
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	A chip. The only trouble is not many people have the software for the Speed Density computer, but I'll bet Chris Johnson does. Andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

09-10-2003, 07:08 AM	#17
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	I talked to Chris yesterday, he will only raise the rev limit for me. Tonight I will test a pair of 28" slicks. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

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