Need a shift light and is my tach really laggin this bad?
Need a shift light and is my tach really laggin this bad? Did a test today in my car. Shifted at 6000rpms while watching speedo too as best I could. Speedometer claimed 70mph at 6000rpm. When I use this-http://www.f-body.org/gears/
I find that I shoulda been hitting about 75. I've checked at various other RPM's on videos i've made and I have found that its off by as much as 400rpm's. I know that this is a common issue, but do aftermarket shift lights run directly to the PCM so I can shift at a true RPM. If I shouldn't be shifting at 6000rpm's by all means tell me. I am researching running nitrous and would imagine that its beneficial to get this problem resolved beforehand.
mods in sig
thanks
I find that I shoulda been hitting about 75. I've checked at various other RPM's on videos i've made and I have found that its off by as much as 400rpm's. I know that this is a common issue, but do aftermarket shift lights run directly to the PCM so I can shift at a true RPM. If I shouldn't be shifting at 6000rpm's by all means tell me. I am researching running nitrous and would imagine that its beneficial to get this problem resolved beforehand.
mods in sig
thanks
Shift light will be wired into the signal wire to the existing tach. Whatever the pcm is putting out, the shift light will see.
Stock tachs are notoriously inaccurate at higher rpms.
Stock tachs are notoriously inaccurate at higher rpms.
So the signal wire from PCM will be accurate, but the tach just lags. I am looking at the Harlan. Thinking red is a good choice. Another thing I am worrying about is when I run nitrous and set my windows switch to say 3000rpm-6000rpm that my 3000rpm will actually be for instance 2750rpm and from what i've read its bad to spray at low RPM's. However I do not want some big tach cluttering up my car. Any suggs?
Teching In
Joined: May 2012
Posts: 16
Likes: 0
From: Liberty, SC
I had the same "lag" in my tach also. the shift light is much more accurate. here my adjustable one from summit. its blue and very bright (too bright). I would either go red or yellow IMHO
http://m1147.photobucket.com/albumvi....html?newest=1
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http://m1147.photobucket.com/albumvi....html?newest=1
Posted from LS1Tech.com App for Android
I've had a Raptor Performance shift light in my AC duct above the radio for quite awhile, it works great!
http://www.ws6project.com/user_stor/.../shift-lights/
http://www.ws6project.com/user_stor/.../shift-lights/
Last edited by 99Bluz28; Jul 31, 2012 at 03:51 AM.
TECH Fanatic
Joined: Aug 2004
Posts: 1,373
Likes: 4
From: Auckland, Nth Is, New Zealand.
All you need is a single LED bulb mounted in your line of vision but that is hardly noticable, you will find that when it comes on your eyes will most certainly see it.
My car is different than you guys, I occassionally road race, Club fun Drags etc. I have it mounted directly in my line of vision above my speedo.
A big ugly multi bulb ricer shift light is not needed.
My car is different than you guys, I occassionally road race, Club fun Drags etc. I have it mounted directly in my line of vision above my speedo.
A big ugly multi bulb ricer shift light is not needed.
