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  Mustangsandmore Forum Archive
  Ford Racing
  MSD rpm chips

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Author Topic:   MSD rpm chips
Dave_C
Gearhead

Posts: 1123
From: Gadsden, Al
Registered: Aug 99

posted 03-03-2001 05:40 PM     Click Here to See the Profile for Dave_C        Reply w/Quote
A while back someone talked about making their own MSD chips using a Radio Shack adjustable resistor.

Since an MSD rpm chip is nothing more than a resistor in a fancy plastic case with two prongs, all you would need to know is the resistance value for each rpm level.

I just bought two adjustable chips. Not the Radio Shack type, ones already in a case. There are made by Shiftnoid (electric shifter company) and are sold by Jegs. they have a small screw in one end and adjust all the way from 0-12,000 rpm. Problem is that the screw has no scale on it. It comes set at 6000 and for every 1/4 turn of the screw it moves the rpm level by 100. Would be easy to get lost if you didn't know what the chip was set at. Also would be easy to lose count of the 1/4 turns if making a large adjustment.

I figured it would be easier and more accurate to set it by measuring the resistance. Borrowed a friend's chips and measured both his and mine. Used my digital multimeter set on the 20K ohm scale. Feel free to copy the list and I would appreciate it if anyone has any numbers to add. Would really appreciate those numbers below 4000. I use the lower chips in my MSD two step to control starting line rpm in my drag car.

RPM Resistance
3000 1.91
3400 2.21
4000 2.70
4600 3.21
5000 3.58
5200 3.77
5400 3.95
5600 4.16
5800 4.35
6000 4.57
6300 4.88
6500 5.10
6600 5.20
6700 5.32
6800 5.43
6900 5.55
7000 5.65
7400 6.12
7600 6.38
7800 6.63
8000 6.89
8600 7.69
8800 7.97
9000 8.27

It appears the scale is .10-.11 for every 100 rpm for most of the range, but is closer together below 4000 and wider apart at the top end of the range. Also may be some variance in the chips themselves. Example: I checked 3 different 6600 rpm chips . Resistance of 5.19, 5.20, 5.21.

Later,

David Cole

steve'66
Gearhead

Posts: 9835
From: Sonoma,CA,USA
Registered: Mar 2000

posted 03-03-2001 08:15 PM     Click Here to See the Profile for steve'66        Reply w/Quote
That's great info David! Hopefully this thread will take off and will be archived!

I only have a 3000 and 5500-6500 chips for the auto-meter shift light. I'll measure their resistance if anyone is interested in auto-meter chips.

SteveW

[This message has been edited by steve'66 (edited 03-03-2001).]

Dave_C
Gearhead

Posts: 1123
From: Gadsden, Al
Registered: Aug 99

posted 03-03-2001 08:31 PM     Click Here to See the Profile for Dave_C        Reply w/Quote
Sure! Post them. The Auto-meter chips and the MSD chips are interchangeable. You can use use MSD chips in your shift light. You can also use the Shiftnoid adjustable chip like I just bought.

The rpms are supposed to be the same. Would be interesting to compare what you have to the ones that I have already checked to see if they are the same.

Later,

David Cole

steve'66
Gearhead

Posts: 9835
From: Sonoma,CA,USA
Registered: Mar 2000

posted 03-03-2001 09:19 PM     Click Here to See the Profile for steve'66        Reply w/Quote
Ok David,

They are pretty close;

3000 = 1.871 k ohms
5600 = 4.1 k ohms
5800 = 4.3 k "
6000 = 4.5 k "
6200 = 4.71 k "
6400 = 4.93 k "

SteveW

Dave_C
Gearhead

Posts: 1123
From: Gadsden, Al
Registered: Aug 99

posted 03-03-2001 09:26 PM     Click Here to See the Profile for Dave_C        Reply w/Quote
They are close. Most are within .05. If you figure 100 rpm for every .10, that would put them within 50 rpm.

Anyone else with any to add?

Later,

David Cole

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 03-03-2001 11:17 PM     Click Here to See the Profile for Moneymaker        Reply w/Quote
This is wonderful information and pretty cool and all, but I really don't have the time at the track to hook up my multi meter and dial in my launch RPM point when I'm in the staging lanes. Maybe it's different for you guys/gals. I keep a hand full range of chips in the glove box and decide what launch RPM depending on the track conditions. I don't use a shift light or air shifter, so the only need that I and most high RPM racers have for the chips are the line lock burn out, launch, and high end limiter. By the way, stay away from any old style triple zero chips in your high limiter as they will cause a untracable high RPM miss.

------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

Dave_C
Gearhead

Posts: 1123
From: Gadsden, Al
Registered: Aug 99

posted 03-04-2001 12:06 AM     Click Here to See the Profile for Dave_C        Reply w/Quote
I don't change anything in the staging lanes either.

Remember, I'm a bracket racer. I change nothing between rounds. I want each run to be identical to the run before. I am making the list so I can set the chips beforehand and do some test and tune with them. Once I get a complete list I'm going to print it out and then tape it inside the lid of my tool box. That way if I want a 4400 rpm leave I can set it before the first time run. Since I am starting from scatch with the Two Step I didn't want to go buy several packs of chips to find where I want to be. Once I find that spot it'll stay there.

Alex, you mentioned "old style triple zero chips". I assume you mean 6000, 7000, 8000, etc. What is the diff between old style and new style? Not that it maters I have the top limiter at 7600, shift light at 6800. The two step is new, so I'll have to play with what the car likes to leave at during a test n tune as soon as the weather breaks.

So much rain here I saw a frog wearing a life vest today.

Later,

David Cole

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 03-04-2001 12:37 AM     Click Here to See the Profile for Moneymaker        Reply w/Quote
David, the older chips can be identified by a raised lip around the perimeter of the top of the chip. The later chips are flush all of the way down the sides up to where the prongs protrude.

------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

F551
Gearhead

Posts: 284
From: Manitoba, Canada
Registered: Nov 2000

posted 03-04-2001 12:48 PM     Click Here to See the Profile for F551        Reply w/Quote
Alex - thanks for clearing up old vs. new chips.

Any of you guys use the "MSD Module Selector"? My brother has one - loves it - no goofing with chips.

About the only time we change a chip is if something is happening ie tires / traction go away.

------------------
Fred
68 Mustang 500CID/Powerglide - "No Tubs"
86 Mustang GT Cobra

Butch Jennings
Gearhead

Posts: 637
From: No. California
Registered: Apr 2000

posted 03-04-2001 12:54 PM     Click Here to See the Profile for Butch Jennings        Reply w/Quote

I use the Module Selector on the low side of my 2-step....I love it too, never had a problem with it.

Thanks Alex, I wasn't aware of a problem with the triple zero chips....I'll keep that in mind.

Butch

------------------
Butcher's Home Page

Moneymaker
Administrator

Posts: 29200
From: Lyons, IL, USA
Registered: May 99

posted 03-04-2001 02:05 PM     Click Here to See the Profile for Moneymaker        Reply w/Quote
Actually I forgot that we have converted two of the three cars to Holley Pro Annihaltor systems. DUH! (blonde moment) We will be installing one in MM this week. No more chips at all! Everything is done through a hand held programer. Launch, burnout, and top end limiter. Very cool! Anyone interested in a MSD 7AL-3 and billet dist with crank trigger?

------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

[This message has been edited by Moneymaker (edited 03-04-2001).]

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