North American Turbocoupe Organization



140 speedo problem
Jeff K Offline
Administrator
#11
I wouldnt put much faith in the cops radar. Radar could have been out of calibration, especially if the cop was moving at the time and getting bad ground bounce to find his speed. Police radar has been known to clock a tree going 70 mph. Cop could have alos locked in on another car and thought it was your brother (BTDT).

One half way decent way to check calibration is to fing one of those radar speed warning signs that shows you speed as you approach it. Lots of police depts around here use those. Just e sure you are the only car passing it, and get the reading when you are fairly far from the sign to reduce cosine error, which causes the radar to read slower than the car is actually moving.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
11 Crown Vic Interceptor
14 Toyota Camry (wifes car)
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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ratrapp Offline
Member
#12
we got side by side leaving work yesterday and my speedo is pretty accurate.at 55 in my truck he was only showing 48-50.it's not off as much the cops radar showed but it's still off.in a few weeks as soon as he gets his cutlass road worthy the t-bird is mine and i'll be sending you a speedo to fix.
88 turbo coupe ported e6 kirban afpr forge bpv walbro 255lph stinger3" dp into 2 1/2 duals ultra flows bobs gutted upper with 60mm tb ranger roller cam.t-3 race engineering cam pulley gillis vale k&n cone 3.73s centerforce d/f 140 motorsports speedo and fms rear spoiler 17x9 cobras
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Rod K Offline
Senior Member
#13
I just got my speedo back from Jeff yesterday, it looks awesome. It may turn into to best money spent on the car todate. He got the calibration dead on from 0 to 60. At 70 it is less than 1% off. I would recommend this mod to anyone wanting a 140 speedometer.
Rod Kiser, '88TC, 5 speed, 5 lug, Cobra 13" front brakes, Mark VII 11 1/4" rear disc brakes, PiMP'n, Bullit wheels, ATR 3" exhaust, Aluminum driveshaft, EDIS, 60 LB injectors, gutted upper & ported lower. NATO Member
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