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Old 04-09-2019, 04:19 PM   #1
flash
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Default MSD Chips

anybody have trouble with the msd chips being off of what they are suppose to be ? 6200 chip for two step but only goes to 6125. I have heard there is somebody out there that makes a more accurate chip-who?
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Old 04-09-2019, 07:17 PM   #2
Tom Goldman
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Default Re: MSD Chips

MSD rpm chips or pills are just resistors inside the casing .
Resistors come in varying degrees of accuracy or tolerance . the most common ones are 20% . with better more precise ones being 10 or 5 %.
Your difference in RPM less than 2%,which is really very good , I've sorted thru as many as 5 or 6 pills sometimes to get an exact rpm.
I'd try a 6300 chip to bring it closer to your desired 6200.
Other things that affect rpm accuracy are oxidized pins on the pill and loose sockets on the 2 step module .
Hi temperatures can cause resistance to change also . .. Something to consider when locating anything electronic.
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Old 04-09-2019, 09:09 PM   #3
flash
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Default Re: MSD Chips

thanks for the imput
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Old 04-10-2019, 04:31 PM   #4
MR DERBY CITY
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Default Re: MSD Chips

You know, it could be your tach that is off.....
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Old 04-10-2019, 06:01 PM   #5
flash
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Default Re: MSD Chips

basing it off onboard data logger readings
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Old 04-12-2019, 02:38 PM   #6
340 Six Pack
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Default Re: MSD Chips

I've noticed the same thing, that they generally activate at lower rpm than rated. You could check out the MSD 89952 RPM Chip Tester, or this list of rpm chips and their corresponding resistance values. I found this somewhere online so take it for what it's worth.

MSD RPM Chips
RPM Ohms
2000 1152
2100 1224
2200 1297
2300 1370
2400 1444
2500 1518
2600 1592
2700 1668
2800 1744
2900 1820
3000 1896
3100 1978
3200 2049
3300 2132
3400 2215
3500 2288
3600 2373
3700 2460
3800 2534
3900 2622
4000 2710
4100 2787
4200 2877
4300 2969
4400 3048
4500 3141
4600 3235
4700 3316
4800 3412
4900 3509
5000 3592
5100 3691
5200 3791
5300 3877
5400 3979
5500 4082
5600 4171
5700 4277
5800 4383
5900 4475
6000 4584
6100 4693
6200 4788
6300 4901
6400 5014
6500 5112
6600 5232
6700 5349
6800 5449
6900 5569
7000 5689
7100 5793
7200 5919
7300 6043
7400 6150
7500 6277
7600 6406
7700 6517
7800 6649
7900 6782
8000 6897
8100 7034
8200 7171
8300 7291
8400 7432
8500 7575
8600 7699
8700 7845
8800 7994
8900 8122
9000 8274
9100 8428
9200 8561
9300 8719
9400 8879
9500 9018
9600 9182
9700 9348
9800 9491
9900 9662
10000 9834

Last edited by 340 Six Pack; 04-12-2019 at 02:45 PM.
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Old 04-14-2019, 01:54 PM   #7
Charlie Yannetti
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Default Re: MSD Chips

I use the Tom Goldman theory.. and my RacePak says that it works for me.. and I'd rather be a weeeeee bit high, than low... just sayin'..
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Old 04-14-2019, 02:01 PM   #8
CMcAllister
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Default Re: MSD Chips

Quote:
Originally Posted by 340 Six Pack View Post
You could check out the MSD 89952 RPM Chip Tester, or this list of rpm chips and their corresponding resistance values. I found this somewhere online so take it for what it's worth.
Is this a new item or discontinued? I see it on the parts vendor sites but find zero mention of it on the MSD site. Is the tester accurate when compared with how an individual chip functions in actual use? Anyone using an MSD 8998 for the same purposes?

Last edited by CMcAllister; 04-14-2019 at 02:08 PM.
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Old 04-16-2019, 03:03 PM   #9
Mike Pearson
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Default Re: MSD Chips

I use the adjustable modules instead of the chips. The ones I have are right on the money +- a small amount. If your chip rpm is real close to what the stall rating on your converter then it could vary more due to weather conditions that effect HP and the actual stall speed of the converter. I am usually chipped at least 1000RPM below the stall speed of the converter. I adjust up and down on the RPM to get my reaction time where I want it to be. The chip RPM makes almost no difference in ET through out a 600-800 RPM range.
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