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List your Speedo/Gear Combo
Topic Started: Aug 12 2010, 10:15 AM (819 Views)
black83zee
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Media Specialist
Judging from the other formulas you probably have 3.27's. There is a way to check: it involves jacking up the rear and rotating the rear wheels and counting how many revolutions of the driveshaft...one tire revolution....if driveshaft turns ( trannie in neutral ) 3.73 times that's the gear you have. This is for a rear with LSD.
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350, carb, headers, side exhaust, T-5, aluminum ds, Baer discs, Bilsteins, tubular a-arms,
tubular torque arm, adjustable track bar and control arms.



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rsrsrs
Advanced Member
Here's for anyone not sure -> http://www.phy.duke.edu/~hartley/iroc/iroc_specs.html

1. 1983 Z-28 145mph 2.73 5.0
2. 1991 Z28 110mph 2.73 5.0 tpi
3. 1991 GTA 140mph 3.23 5.7
4. 1991 r/s 110 mph 2.73 5.0 tbi
5. 1990 GTA 140 mph 3.23 5.7
6. 1985 Iroc 85 mph 2.73 this has got to be wrong but that's whats in her now
7. 1988 GTA digital dash fastest i got it was 120 5.7 3.23
8. 1984 Z28 85mph 3.73 5.0
9. 1991 GTA 120 mph 2.73 5.0
10. 1991 R/S 110 mph 2.73 5.0 TBI
11. 1988 IrocZ - 145mph - 3.27 - 5.7 Tpi
12. 1989 Formula 350 140mph 3.27 TPI
13. 1989 Formula 350 140mph 3.27 TPI
14. 1992 Z28 140 mph 3.23 5.7
15. 1989 Formula 350 140mph ?gears? 5.7 TPI
16. 1990 Camaro RS 110mph 3.23 3.1 MPFI
Edited by rsrsrs, Aug 15 2010, 10:04 AM.
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Robb Knight
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El Bandolero
black83zee
Aug 15 2010, 07:40 AM
Judging from the other formulas you probably have 3.27's. There is a way to check: it involves jacking up the rear and rotating the rear wheels and counting how many revolutions of the driveshaft...one tire revolution....if driveshaft turns ( trannie in neutral ) 3.73 times that's the gear you have. This is for a rear with LSD.
I think its safe to say I have the same as the other stock guy and judging by that chart I do. My car is stock. Im gonna say I have the 3.27. I'll do what you suggested later this week or today to verify, if I get a chance.

1. 1983 Z-28 145mph 2.73 5.0
2. 1991 Z28 110mph 2.73 5.0 tpi
3. 1991 GTA 140mph 3.23 5.7
4. 1991 r/s 110 mph 2.73 5.0 tbi
5. 1990 GTA 140 mph 3.23 5.7
6. 1985 Iroc 85 mph 2.73 this has got to be wrong but that's whats in her now
7. 1988 GTA digital dash fastest i got it was 120 5.7 3.23
8. 1984 Z28 85mph 3.73 5.0
9. 1991 GTA 120 mph 2.73 5.0
10. 1991 R/S 110 mph 2.73 5.0 TBI
11. 1988 IrocZ - 145mph - 3.27 - 5.7 Tpi
12. 1989 Formula 350 140mph 3.27 TPI
13. 1989 Formula 350 140mph 3.27 TPI
14. 1992 Z28 140 mph 3.23 5.7
15. 1989 Formula 350 140mph 3.27 5.7 TPI
16. 1990 Camaro RS 110mph 3.23 3.1 MPFI
Posted Image

1989 Firebird Formula 5.7 350 T-Tops WS6
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Demon-Z
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True American And Proud
rsrsrs
Aug 15 2010, 10:03 AM
Here's for anyone not sure -> http://www.phy.duke.edu/~hartley/iroc/iroc_specs.html

1. 1983 Z-28 145mph 2.73 5.0
2. 1991 Z28 110mph 2.73 5.0 tpi
3. 1991 GTA 140mph 3.23 5.7
4. 1991 r/s 110 mph 2.73 5.0 tbi
5. 1990 GTA 140 mph 3.23 5.7
6. 1985 Iroc 85 mph 2.73 this has got to be wrong but that's whats in her now
7. 1988 GTA digital dash fastest i got it was 120 5.7 3.23
8. 1984 Z28 85mph 3.73 5.0
9. 1991 GTA 120 mph 2.73 5.0
10. 1991 R/S 110 mph 2.73 5.0 TBI
11. 1988 IrocZ - 145mph - 3.27 - 5.7 Tpi
12. 1989 Formula 350 140mph 3.27 TPI
13. 1989 Formula 350 140mph 3.27 TPI
14. 1992 Z28 140 mph 3.23 5.7
15. 1989 Formula 350 140mph ?gears? 5.7 TPI
16. 1990 Camaro RS 110mph 3.23 3.1 MPFI
OK well acording to the link this is what my car should have had. (wish it still did)


85 IROC A4 LB9 V8 9.5:1 5.0 (305) 215@4400 275@3200 TPI ---- ---- 3.23 {3.42}
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Posted ImageThanks Slash

NY3G - NY5G America's new ArmyDemon-Z



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19transam86
Like a G6
the chart syas 3.23 which sounds about right to me.

1. 1983 Z-28 145mph 2.73 5.0
2. 1991 Z28 110mph 2.73 5.0 tpi
3. 1991 GTA 140mph 3.23 5.7
4. 1991 r/s 110 mph 2.73 5.0 tbi
5. 1990 GTA 140 mph 3.23 5.7
6. 1985 Iroc 85 mph 2.73 this has got to be wrong but that's whats in her now
7. 1988 GTA digital dash fastest i got it was 120 5.7 3.23
8. 1984 Z28 85mph 3.73 5.0
9. 1991 GTA 120 mph 2.73 5.0
10. 1991 R/S 110 mph 2.73 5.0 TBI
11. 1988 IrocZ - 145mph - 3.27 - 5.7 Tpi
12. 1989 Formula 350 140mph 3.27 TPI
13. 1989 Formula 350 140mph 3.27 TPI
14. 1992 Z28 140 mph 3.23 5.7
15. 1989 Formula 350 140mph 3.27 5.7 TPI
16. 1990 Camaro RS 110mph 3.23 3.1 MPFI
17. 1986 trans am 85 MPH 3.23 5.0 4bbl
Posted Image
1986 Pontiac Trans Am, 305, 5-spd, 17" ZO6 Wheels
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black83zee
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Media Specialist
1. 1983 Z-28 145mph 2.73 5.0 CFI
2. 1991 Z28 110mph 2.73 5.0 tpi
3. 1991 GTA 140mph 3.23 5.7
4. 1991 r/s 110 mph 2.73 5.0 tbi
5. 1990 GTA 140 mph 3.23 5.7
6. 1985 Iroc 85 mph 3.23 TPI
7. 1988 GTA digital dash fastest i got it was 120 5.7 3.23
8. 1984 Z28 85mph 3.73 5.0
9. 1991 GTA 120 mph 2.73 5.0
10. 1991 R/S 110 mph 2.73 5.0 TBI
11. 1988 IrocZ - 145mph - 3.27 - 5.7 Tpi
12. 1989 Formula 350 140mph 3.27 TPI
13. 1989 Formula 350 140mph 3.27 TPI
14. 1992 Z28 140 mph 3.23 5.7
15. 1989 Formula 350 140mph 3.27 5.7 TPI
16. 1990 Camaro RS 110mph 3.23 3.1 MPFI
17. 1986 trans am 85 MPH 3.23 5.0 4bbl


Man, what was GM think with the 85mph speedo? "Buy our cars....they don't go very fast!"
Edited by black83zee, Aug 16 2010, 07:45 AM.
Posted Image
350, carb, headers, side exhaust, T-5, aluminum ds, Baer discs, Bilsteins, tubular a-arms,
tubular torque arm, adjustable track bar and control arms.



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1320B4U
"Miley Cyrus Club Pres"
^ Government stan, government mandated 85mph speedo's. All cars had them including the '81 vette i used to have.
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1991 R/S..1992 L98 Firehawk Tribute (sold)..1999 c5/t56 (sold)..2012 z-71
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black83zee
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Media Specialist
What happened to Buy American? Did they mandate the 85mph speedo on BMWs, Hondas and Toyotas? I wonder. If the Gov mandates these stupid rules, then the death of the american car industry is on their hands!
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350, carb, headers, side exhaust, T-5, aluminum ds, Baer discs, Bilsteins, tubular a-arms,
tubular torque arm, adjustable track bar and control arms.



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1320B4U
"Miley Cyrus Club Pres"
As per the 1979 NHTS law:

"In 1979 the NHTSA (National Highway Traffic Safety Administration) passed a law that limited speedometers to 85 MPH. The same law also required emphasis on 55 MPH (the Federal speed limit enacted in '73). Unsure when the speedometer law was repealed, but max speed remained 55 until 1988 when it was upped to 65 (where it stands today). "

More info on the law can be found at:

http://en.wikipedia.org/wiki/National_Maximum_Speed_Law


**Like i stated earlier, it was to conserve fuel and certain environmental factors. If you read the wikipedia link, tests showed 1-.5% fuel conserved as a result of this so it wasn't really a fuel saving measure..just the government intervening in something else. I have to admit though, there really isn't any need to see how fast your car can go if you can't tell the speed but now w/gps and all, it shows speed on your cheapest garmin out there so mandates like this would never fly again .
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1991 R/S..1992 L98 Firehawk Tribute (sold)..1999 c5/t56 (sold)..2012 z-71
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black83zee
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Media Specialist
Makes sense...but I like the analogy to the scene in Spinal Tap where the guy shows his amps have volume controls that go to "11" instead of "10"! I like my speedos to show 140! Not 85!
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350, carb, headers, side exhaust, T-5, aluminum ds, Baer discs, Bilsteins, tubular a-arms,
tubular torque arm, adjustable track bar and control arms.



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charged355
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Nythirdgen Founder
I gotta 145 from my car if sumone wants it

My speedo goes to 200 now :-)
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Custom Forged 355 / Solid roller cam/valvetrain / Victor Jr heads / Hurricane Intake/ Accufab 1250cfm Throttle body / MegaSquirt 3 Engine Managment/ 1000cc SouthBay Injectors/ 7.6:1 CR / 4" Custom Single Exhaust / 4000 Circle D Stall/ CK Performance Billet 4L80 FMVB Trans Brake / 3" Chromoly Driveshaft / Full UMI Tubular Rear Suspension / Moser/Strange 9" / 4:11 gears Detroit Locker / Sumped LS1 gas tank / A1000 Fuel pump / A1000 FPR / Paxton Fuel filter / -10 Fuel line -8 return / Borg Warner S475 Turbo @10psi/ JGS 50mm WG & 56mm BOV / PA Racing Complete Tubular Front End Kit With Coilovers / Full Autometer Dash / Custom Black Suade Guts / Built by yours truly/ Tuned by George the EFI whiz

http://www.youtube.com/channel/UCnxlPhzRElZYM5YE-n2NRUw
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Demon-Z
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True American And Proud
charged355
Aug 16 2010, 10:12 AM
I gotta 145 from my car if sumone wants it

My speedo goes to 200 now :-)
Hold on to it I want one but have other things to fix first. But if you get a good offer go with it.
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Posted ImageThanks Slash

NY3G - NY5G America's new ArmyDemon-Z



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