ok Last ngiht me and my firnds were on the freeway and no one was around my firnd was like the fastest car ive ever been in was doin 110 so i was like wacth. Well i burried my speedo needle and got up to 6500 RPM i love having no govener. Well i did a speeed calcultion and it seems inpossible it sayd i was doin 179.67 MPH and i dono if i did anythign wrong but hers what i entered.
Tire radious 15
RPM 6500
REAR gear ratio 3.23
Tranny ratio 1
Did i do something wrong here????

 

check ur RPO codes..all v6's came with 3.42:1 i THINK it was 87+

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88 Firebird 2.8
MODS (either coming or on):
Flowmaster Cat Back, Random Technologies Cat, 3" intermediate pipe, Accel 8.8 wires, MSD Coil, MSD Ignition Module,MSD 6a, B&M Shifter, Transgo Shift Kit, Cold Air Induction, NEXT MOD: 5 speed...(torque convertor going so 5 speed a better idea) ..Then peeling and cracking paint..

 

thought of one more thing...radius is 1/2 a circle...if 15 is the radius of ur tires..then the full diameter would be 30" which i KINDA DOUBT u have

take how large ur tires are then divide it in half and thats the radius..AND since u were in 4th gear doing that fast...look down the chart and enter the correct 4th gear ratio... its like .76 or something like that...

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88 Firebird 2.8
MODS (either coming or on):
Flowmaster Cat Back, Random Technologies Cat, 3" intermediate pipe, Accel 8.8 wires, MSD Coil, MSD Ignition Module,MSD 6a, B&M Shifter, Transgo Shift Kit, Cold Air Induction, NEXT MOD: 5 speed...(torque convertor going so 5 speed a better idea) ..Then peeling and cracking paint..

 

ok my radius is 13 so i was doin 155.??? and my rear end is 3.23 i have my build sheet the stick came with the 3.42

 

Remember that the calculations don't take several things into account: wind resistance, weight of the car, worn parts, and whether or not you actually have the HP to get your car up to that speed.
Vman

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1989 Camaro RS
2.8 V6
K&N's
700R4 tranny
Cragar Street Pro rims (old Series 30)
Pioneer DEH-P3000

1969 Camaro SC
350 HO from a Vette
Turbo 350 tranny
In the process of being restored

 

I think the speed might be a little high, i'd put you in the range of 130-135 maybe. 140'd be pushing it. unless you have major mods. you have to remember, the Z28's topped out at around the 140-150 mark, so when our 2.8's push 130-140 it's really good. Now, a new T/A can go until it reaches it's governer or 163, huh you call that a governer?

 

hey, by the way, what's your speedo go up to?

 

it goes up to 110 and i pinned it at the needle stop at the bottom and still kept goin faster i hit 6500 RPM.
I have
Power pullys
MSD 6al Blaster coil and msd wires
Flowmaster catback high flow cat
Fast Chip stage 2
TB bypass
Polished ports
cold air intake with a hudge *** K&n for a F$%# Rustang i did some other stuff but ive done soo much ive lasot count lets say 8,000 worth of repairs and mods u tend to loose track i put more money in the car then its worth but it was all worth it now i just need to blow my engine

 

The highest I ever got was 137 mph, racing a VW turbo Passat. We both had CB radios on channel 19, and his speedo went up to 150, so I just asked how fast we were going when we were neck & neck. I remember being in overdrive, at low RPM's (love that B&M 4-3 kickdown valve!), but I don't remember the RPM's. Around 3000 I guess?


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards