Led needles 101 !!!!!! - Page 2 - 3000GT/Stealth International Message Center

98slept · 07-30-2008, 11:17 PM

Quote:

Originally Posted by Mitsu

How do you "test the rpm tach signal with a multimeter?"

Do be honest with you. i didnt test it. it was my supervisor/friend. He used some multimeter with some weird fat probe and had it hooked up to either a tach signal or one of the wires off the spark plugs. I dont remember what he did exactly

and i believe he had to convert it to rpms throught some calculations. He said i was off by 60rpms, and i believe him since he is really smart. Whether its true or not i dont know. I just know my rpms are not off by much

So i assumed im off by 60rpms.

marshallh · 07-30-2008, 11:20 PM

Quote:

Originally Posted by Mitsu

How do you "test the rpm tach signal with a multimeter?"

I'm wondering also. Thought you'd need a scope or frequency counter for that?

Protip for yall on the LEDs: They are rated by viewing angle and brightness. The viewing angle is the size of the cone of light projected when it's turned on, and the brightness (measured in millicandelas or MCD) is the average light intensity over a certain area of the cone.

A 120deg, 900mcd LED can be the same "brightness" as a 15deg, 10,000mcd LED. The former will get you a wide, diffused light, while the latter is more like a laser beam; very narrow but very bright.

Good call on using surface-mount LEDs!

alex10superman · 07-31-2008, 07:18 AM

Nice write up. I'll need to do this one of these days!

95gto · 07-31-2008, 09:53 AM

Great write up, solid info!

onyxice · 07-31-2008, 03:09 PM

Well done sir.
Since I got the car I've been wondering how I would make the dash cluster more to my liking... and you just told me. lol

I'm guessing a slight change in the LEDs could retain the illumination and get rid of the projection? I don't really like how it shoots the light onto your dash, I could live with it though... far better than stock imo.

About the measuring RPMs with a DMM... I'ev got a crazy ass DMM, no clue how to use 99.999% of it's functions....

daddy · 07-31-2008, 03:15 PM

Right on time

I just got my Speedhut gauges, will be doing this too

sublime_whatigo · 07-31-2008, 03:57 PM

So uh, whats your car redline at now? Sure looks like you hit almost 7400 in that vid to me.

SpikeyGG · 07-31-2008, 10:25 PM

This is a great writeup. Thanks!

As for the tach being off after removing the needle, I've never had my gauges apart and mine are already off by a bit... I notice the difference in my datalogger. Though now that I think about it, I'm not sure if the datalogger is wrong or the tach is wrong. Oh well.

MustGoFaster · 07-31-2008, 10:50 PM

I wouldn't worry about it much. Do some mods and you can tell it can't keep up with the engine in 1st gear. I've hit my rev limiter while my tach only said 6800 or so. 60 RPM = nothing.

Colt45_GTO · 07-31-2008, 10:56 PM

that looks fuckin nice mate you must have the patience of a spider seriously.

07-31-2008, 07:18 AM	#13 (permalink)
alex10superman I love my VR-4!!! Join Date: Aug 2006 Location: New Mexico Drives: 1997 3000GT VR-4 Trader Rating: (2)	Re: Led needles 101 !!!!!! Nice write up. I'll need to do this one of these days! __________________ More Pictures of my car here -> Pics

07-31-2008, 09:53 AM	#14 (permalink)
95gto Forum Member Join Date: Mar 2006 Location: St. Louis, MO Drives: 95' VR4 Trader Rating: (0)	Re: Led needles 101 !!!!!! Great write up, solid info!

07-31-2008, 03:57 PM	#17 (permalink)
sublime_whatigo Hates Gravel Join Date: Sep 2002 Location: G.R. Michigan Drives: reliable car (nissan Trader Rating: (24)	Re: Led needles 101 !!!!!! So uh, whats your car redline at now? Sure looks like you hit almost 7400 in that vid to me. __________________ 92 3000GT VR4 Black Wheel Mafia - Member 002 Matt

07-31-2008, 10:25 PM	#18 (permalink)
SpikeyGG Automotive Geek Join Date: Jan 2006 Location: Zee upper vest side Drives: 1993 3000GT VR-4 Trader Rating: (3)	Re: Led needles 101 !!!!!! This is a great writeup. Thanks! As for the tach being off after removing the needle, I've never had my gauges apart and mine are already off by a bit... I notice the difference in my datalogger. Though now that I think about it, I'm not sure if the datalogger is wrong or the tach is wrong. Oh well. __________________ 93 VR-4 K&N FIPK, Eibach Pro Sport springs, MSD 8.5mm wires, NGK iridium plugs, solid polyurethane motor mounts, Sumitomo HTR+ tires, gutted precats, adjustable rear control arms, 99 lifters, underhood and console shifter bushings, aluminum dash vents, clutch vacuum assist delete, GM boost logging, full set of Defi gauges. Always a work in progress...

07-31-2008, 10:50 PM	#19 (permalink)
MustGoFaster Forum Member Join Date: Aug 2003 Location: Minnesota Drives: An AEM car in -10F Trader Rating: (9)	Re: Led needles 101 !!!!!! I wouldn't worry about it much. Do some mods and you can tell it can't keep up with the engine in 1st gear. I've hit my rev limiter while my tach only said 6800 or so. 60 RPM = nothing. __________________ ~Ryan 92 Stealth R/T TT- Not exactly done- 93 RT TT- Not much of a car anymore. "This is a solution looking for a problem." - Not me

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