I put in a z28 140 speedometer in my 87rs and
had it calibrated, do you think this effects speed limiter since the sensor is on the speedometer the car thinks I'm doing 85 when its really 140 is this possible.
V6 2.8 T5 140 speedo, coolant bypass,manifold, 160 thermostat, 3 inch exhaust,just blown lifters

 

I have had a 1987 2.8l firebird and it had not speed limiter then... All it would do it to get the speedo needle a bit past 140kph until it hit the stopper but the car itself had no speed limiter!

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1999 30th anniv. TransAm #877
** BESTS:60ft=1.935 1/4 ET=13.08 MPH=111.8 ** (Only 3.5K miles)
T-TOP,6M-Hurst,12cd, TCS
!EGR * !MAF Screen * ported and polished MAF * !silencer baffles * ! lid baffles * ported and polished TB * removed primary and secundary baffles * sealed ram-air * 9.4k timing-tricker * !CAGS * Mobil 1 * Lou's short stick * BMR panhard rod * BMR poly/poly LCAs * !DRL * Polished SLP resonator catback * 2 Ractive mufflers * 3x3 'fernco' mod * K&N * TB stop grind * Grotyohann headers * offroad Y-pipe* Power pedals * 19+ coats Zaino * WHITE gauges cluster * blue door TA badges * pontiac windshield decal * Polished momo shift **** * 4.5" brosal exhaust tips * Kenny Brown DD SFC
Ordered:
Polished: Calipers * Hood struts * Air tubes * Valve covers,Heat shields , etc.
Later:Cam + spring + pushrods swap + stage II heads
2000 Black Z-71 K1500 5.3l
ext.cab * !intake baffle * !MAF screen * !EGR mod

 

The speed limiter is in the prom chip it has nothing to do with the seedo.
There fixed it i was sorta drunk when i first posted it

[This message has been edited by FAST RS (edited May 11, 2001).]

 

I know the speed limiter is in the prom but clocking pulses are received from the sensor in the speedo.

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You kinda answered your own question.

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR
-Gutted Air Boxes