Predator RPM Off????
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Teching In
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Predator RPM Off???? I just replaced my THM350 with a 700R4. According to the Predator it is shifting from 1st to 2nd at 4100 rpm at W.O.T. But according to the speedo its shifting at 45 MPH which should be ~5500 rpm. Has anyone ever heard of a Predator tach being off? Is it even posible?
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Joined: Dec 2005
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From: CT
nah, cuz the predator reads the exact info direct from the cars PCM... the display/screen refresh rate is probably too slow to be able to show the actual rpm it shifts at...
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06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
The PCM is not controlling this tranny.....
Thread Starter
Teching In
Joined: Sep 2006
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The tranny is not computer controlled. The engine is a 6 liter from a 2004 van in a 1970 Jimmy (Blazer). The original tach does not work with the computer so I have using the predator as a tach. Both gears and tires have been changed from original but I figure the speedo is only off 6%. Original tires were 7x15 which I beleive is 29" tall and 3.08 gears. Tire and gears were changed to 33" and 3.73. According to the speedo it shifts at 45 mph from 1st to 2nd.
OK, so if the only question is can the RPM reading on the Predator be wrong, the answer is no, as it is reading it directly from the PCM.
It may update too fast to see the actual rpm in 1st gear, check it on the 2-3 or 3-4 shift and see what rpm you get.
Thanks
Mike
It may update too fast to see the actual rpm in 1st gear, check it on the 2-3 or 3-4 shift and see what rpm you get.
Thanks
Mike
Thread Starter
Teching In
Joined: Sep 2006
Posts: 25
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OK, so if the only question is can the RPM reading on the Predator be wrong, the answer is no, as it is reading it directly from the PCM.
It may update too fast to see the actual rpm in 1st gear, check it on the 2-3 or 3-4 shift and see what rpm you get.
Thanks
Mike
It may update too fast to see the actual rpm in 1st gear, check it on the 2-3 or 3-4 shift and see what rpm you get.
Thanks
Mike
Thanks for the help
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Thread Starter
Teching In
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The Predator RPM wasn't refreshing fast enough. I held in manual 1st at 30mph and the Predator said 3770 rpm that would make the 45mph 1st to 2nd shift ~5500 rpm, right where it is supposed to be. Thanks for all the help.
Thanks,
Thanks,
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Joined: Dec 2005
Posts: 2,932
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From: CT
see, now that's what I said Mikey - hahahhaa.... not that it's too fast - cuz them older ones aint fast, they're sloooow, like in your car... 
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06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
06MonteSS / DiabLew Tune
2014 Camaro 2SS/RS - LS3, 6-speed manual, short-throw performance shifter, NPP dual-mode performance exhaust, 1LE front splitter, ZL1 rockers, Z28 Rear Spoiler, all paint-matched Red Rock Metallic, BMR strut tower brace, Cold Air Inductions cold air intake, Apex Motorsports, Inc. catch-can, Custom DiabLew Tune
www.diablewtune.com -- www.diablocustomtune.com -- www.diablocustomtunegm.com
Well, you may have a faster PCM, but its turning the wrong wheels!!!
Any time you wanna come down and see how that Monte fairs against the mighty Z28, bring it on.
