Stock Tach Accuracy
10-02-2005, 05:29 PM
#1
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Stock Tach Accuracy All I can say is, damn that thing is slow. I put in my raptor shift light today, and went for a short test drive. In 1st gear, when the shift light comes on, the tack is only at 5100, 2nd gear is a little closer at about 5500, and by 3rd gear its seems to be really close in the 5700-5800 range.
10-02-2005, 11:54 PM
#5
yeah, i discovered this the other day. from idle if i floor it, it will bounce rev limiter when my tach shows 4,800 rpm. motor is untouched except for a lid. i always thought having 2 tachs was lame, especially in an auto, but i am seriously considering it now. it will be a MUST after i get a cam.
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10-03-2005, 09:21 PM
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I mounted my light in the ac vent over the stereo. I bought it from Speed inc. You can mount it pretty much where ever you want. I just didn't want mine out. I wanted it hidden just to keep a cleaner look.
http://www.installuniversity.com/ins...sity/index.htm
this is info on how to install the light, even though this is for a harlan.
I have the raptor. www.raptorperformance.com
http://www.installuniversity.com/ins...sity/index.htm
this is info on how to install the light, even though this is for a harlan.
I have the raptor. www.raptorperformance.com
10-04-2005, 07:54 AM
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Whisper, I really like my Stewart Warner Ultra-Shift shift light. It's a little big for some, but painless to install and I like the digital RPM readout.
10-06-2005, 09:31 AM
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My tach is slow to and at Idle the tack reads about 300-400 rpm higher than the computer reads. I got a raptor shift light and put it in the little circle for the driver side window defrost. I still used the stock cover for the defroster but I reversed it so its only noticable when it lights up and it is very bright. It wires directly to the computer so it is dead on and a fairly simple install.
10-07-2005, 05:49 PM
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mine isn't that bad. when i have it hooked up to the computer, it is withen 50-75 of the computers reading. I have no shift light yet, and i shift when mine says 6k-6200 or so and i've never hit the limiter. So some of yours are WAY off.
10-09-2005, 04:05 AM
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I was to the understanding that our tachs are slow due to the serial connection... I got tired of "guessing" when I had to shift, so I just put in a raptor as well. During testing, I had it set for 2200rpm and it would go over when the tach read 2100, every gear... Haven't noticed how off it is since I set the light for 6100, but I'm sure it's sizable... Just get a shift light and be done with it.
10-09-2005, 09:11 AM
#17
Guys, remember that its not that the tach is off a set number of RPM (although that ay be a seperate issue too) Its a question of lag time. It may be off a quarter of a second, but in first gear that quarter of a second lag may be a difference of 500 - 1000 RPM. Stab the throttle in neutral and watch the tach take a moment to react.
