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Old 05-02-2008, 03:12 PM   #1
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Default MS - Stock question

I am putting MS on my daily driver in prep for a turbo. If I wire the MS to the stock ECU harness, leaving the stock plug, can I just switch back and forth between the two ECUs until I get the MS tuned, or will that mess things up?

If I understand correctly, it should be fine so long as I only have one ECU plugged in at a time, and I'm using all the stock sensors. (All this is until I get the turbo on, of course. Once I do that there is no turning back)

I only have the one car, and if I need to go somewhere before my tuning is complete, it would be nice to be able to do that. If not, I'll have to borrow somebody else's car.

-Corey
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Old 05-02-2008, 04:09 PM   #2
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Quote:
Originally Posted by skidude108 View Post
I am putting MS on my daily driver in prep for a turbo. If I wire the MS to the stock ECU harness, leaving the stock plug, can I just switch back and forth between the two ECUs until I get the MS tuned, or will that mess things up?
If you're keeping the injectors stock for now, and leaving the factory sensors in place, you'll be fine. You'll probably be using a non-standard (GM) IAT sensor and a wideband O2, so wire those direct to the MS connector. Also, don't forget to configure all the pullups in the MS for standalone operation- these would be the temp sensor resistors and the CMP/CKP input pullups.

Quote:
I only have the one car, and if I need to go somewhere before my tuning is complete, it would be nice to be able to do that. If not, I'll have to borrow somebody else's car.
Truthfully, if you bench-test the MS properly beforehand and start with the DIY base maps, you should be able to have it driveable in a day- a weekend at most. But there's no harm in leaving the factory connectors in place. Mine are zip-tied up out of the way above my MS (note that I cut, rather than spliced most of the wires, but same basic idea):



The other option, which would make the in-car portion of the wiring even simpler and cost only a small amount extra, would be to build yourself a plug-n-play harness as described by Braineack in This Thread.
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Old 05-02-2008, 05:51 PM   #3
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if you want make the PNP addapter harness with switches to swap between ecus for fuel and spark. I didnt end up putting switches in cause it takes me <5 minutes to swap between ecu's
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