Track car wiring??? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Race Prep Miata race-only chat.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 12-04-2015, 04:29 PM   #1
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Oct 2007
Location: Louisville, KY
Posts: 419
Total Cats: 9
Default Track car wiring???

I'm on the fence and I need a push. I'm building a dedicated autocross/track car using a MSM driveline and wiring and MSPro. With the bare bones build I am doing, there is a lot of wire in that harness that will not be used.

So, do I.....

1. Buy a MSPro PnP for a MSM and take everything out of the existing harness that is not needed.

or

2. Buy a generic MSPro and start from scratch and wire the car myself.

or

3. <insert a better option>


I am technically and physically capable of either approach, but not sure which approach will be the least time consuming/frustrating.
fourwhls is offline   Reply With Quote
Old 12-04-2015, 06:13 PM   #2
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,999
Total Cats: 1,466
Default

If you have to ask, pick #1.

#2 only if you like pain.

Why are you using the MSM wiring? Is it going in an MSM car?
aidandj is offline   Reply With Quote
Old 12-04-2015, 06:39 PM   #3
Hug Life
iTrader: (3)
 
Monk's Avatar
 
Join Date: Apr 2014
Location: Huntington, Indiana
Posts: 2,803
Total Cats: 494
Default

Buy the megasquirt that goes with whatever year your car is.
Run extra wires as necessary.
You don't want to do a harness swap.
Monk is offline   Reply With Quote
Old 12-05-2015, 09:38 PM   #4
Junior Member
iTrader: (1)
 
Join Date: Jan 2012
Posts: 115
Total Cats: 9
Default

While it is possible to do it, I've done two harnesses, messed up 1, the 3rd harness I didn't even bother with.
JSpeed6 is offline   Reply With Quote
Old 12-05-2015, 09:53 PM   #5
Supporting Vendor
iTrader: (3)
 
Join Date: Jul 2006
Location: San Diego
Posts: 2,864
Total Cats: 491
Default

If you want to compete with the car, there are bigger fish to fry. Leave the harness alone as much as possible, do what you need to do to get it to work.

If you want an eternal project, hack up the wiring. Or worse in some ways, do it all over from scratch.
ThePass is offline   Reply With Quote
Old 12-06-2015, 11:59 AM   #6
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Oct 2007
Location: Louisville, KY
Posts: 419
Total Cats: 9
Default

Use the MSM harness it is! Thanks for the feedback.

The wiring was much easier in my V8 build. The GM harness was just an engine harness.
fourwhls is offline   Reply With Quote
Old 12-06-2015, 12:16 PM   #7
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,999
Total Cats: 1,466
Default

Is it an MSM chassis?
aidandj is offline   Reply With Quote
Old 12-06-2015, 12:23 PM   #8
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,107
Total Cats: 518
Default

Please note, for a Miata wiring harness, you'll need the battery harness, engine harness, and chassis harness for the car to work. If it's a stock ecu, you'll need the dash harness with the immobilizer as well.
curly is offline   Reply With Quote
Old 12-06-2015, 04:02 PM   #9
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Oct 2007
Location: Louisville, KY
Posts: 419
Total Cats: 9
Default

Quote:
Originally Posted by aidandj View Post
Is it an MSM chassis?
Yes and no....The MSM chassis is rusted too bad so I'm using a clean 99 tub. The driveline, subframes, harness etc are coming from the MSM.
fourwhls is offline   Reply With Quote
Old 12-06-2015, 04:32 PM   #10
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,999
Total Cats: 1,466
Default

Quote:
Originally Posted by fourwhls View Post
Yes and no....The MSM chassis is rusted too bad so I'm using a clean 99 tub. The driveline, subframes, harness etc are coming from the MSM.
So use the 99 harness.
aidandj is offline   Reply With Quote
Old 12-06-2015, 04:33 PM   #11
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Oct 2007
Location: Louisville, KY
Posts: 419
Total Cats: 9
Default

99 harness went with the 99 drivetrain and will be installed in an Exocet. I only have the MSM harness.
fourwhls is offline   Reply With Quote
Old 12-06-2015, 04:38 PM   #12
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,999
Total Cats: 1,466
Default

The engine harness isn't the hard part. It's the rest of the chassis harness that is annoying.

I personally would use the 99 harness and put the msm harness in the excocet.
aidandj is offline   Reply With Quote
Old 12-07-2015, 10:54 AM   #13
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Oct 2007
Location: Louisville, KY
Posts: 419
Total Cats: 9
Default

Quote:
Originally Posted by aidandj View Post
The engine harness isn't the hard part. It's the rest of the chassis harness that is annoying.

I personally would use the 99 harness and put the msm harness in the excocet.
Not an option for me, the 99 harness and driveline belongs to someone else. The only harness I have is the MSM.

Why is the 99 harness a better option when paired with a MSPNP?
fourwhls is offline   Reply With Quote
Old 12-07-2015, 10:56 AM   #14
SADFab Destructive Testing Engineer
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 17,999
Total Cats: 1,466
Default

Quote:
Originally Posted by aidandj View Post
The engine harness isn't the hard part. It's the rest of the chassis harness that is annoying.
because
aidandj is offline   Reply With Quote
Old 12-07-2015, 11:27 AM   #15
Hug Life
iTrader: (3)
 
Monk's Avatar
 
Join Date: Apr 2014
Location: Huntington, Indiana
Posts: 2,803
Total Cats: 494
Default

You may as well build your own **** now for all the headache you're going to run into making that harness work.
Monk is offline   Reply With Quote
Old 12-08-2015, 09:52 AM   #16
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Depends on the nature of the car. A scratch built race car gets a scratch built harness.
Ben is offline   Reply With Quote
Old 12-08-2015, 10:12 AM   #17
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Oct 2007
Location: Louisville, KY
Posts: 419
Total Cats: 9
Default

Quote:
Originally Posted by Ben View Post
Depends on the nature of the car. A scratch built race car gets a scratch built harness.
Well, here's the current state of this project. I don't think it gets much more bare bones, hence the question.







Attached Thumbnails
Track car wiring???-80-shell1_1551437c717e5ee5216cf9b54a9ba6344432be73.jpg   Track car wiring???-80-shell2_7f45f1247714d6782396c826e4f1d2009ff91a64.jpg  
fourwhls is offline   Reply With Quote
Old 12-08-2015, 10:58 AM   #18
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,107
Total Cats: 518
Default

Remember how many clips there were when you removed the 99 harness? They all take 5 times longer when you're putting them back in for orientation, location, access, etc.

But remove every trace of wire in the 99, and install every wire you have from the msm. If you can get the cars side by side, you could probably use the msm for a rough reference. If it's a race car, strip the harness of wrapping and carefully cut out what you don't need.
curly is offline   Reply With Quote
Old 12-08-2015, 11:01 AM   #19
Supporting Vendor
iTrader: (1)
 
OGRacing's Avatar
 
Join Date: May 2014
Posts: 1,764
Total Cats: 46
Default

i ran the holley efi for the engine, for the chassis harness i made my own. everything works but the DIY harness came out heavier then the stock one.
OGRacing is offline   Reply With Quote
Old 12-08-2015, 12:21 PM   #20
Elite Member
iTrader: (5)
 
Join Date: Dec 2010
Location: Raleigh, NC
Posts: 1,970
Total Cats: 49
Default

We rewired the lexus. It took a good 4-6 weeks with 2 of us working on it and countless hours scouring over the wiring diagrams.

If you don't have the wiring diagrams, I would pass on rewiring any car. It will be really complicated and frustrating and you won't do as good a job as factory.

Rewiring from scratch is maybe ok, but its really unnecessary. Factory wiring on the Miata is pretty good. My biggest suggestion for anyone undertaking this is to do your best to keep the factory connectors and de-pin any wires you don't need anymore. The Lexus had locks on the pins which we didn't realize until we had cut some of the wires already. This ended up being a pain since we made a few mistakes.
Seefo is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
94 LE VVT Build shuiend Build Threads 31 06-04-2016 05:15 PM
Extended Lower Ball Joint Group Buy--FIRST shipment cordycord Miata parts for sale/trade 98 03-25-2016 02:02 AM
Help! Ignition timing on MX5 Turbo, MS2PNP PendleMotorcycles MEGAsquirt 27 01-08-2016 06:58 PM
Time for a new chapter timk Insert BS here 1 12-03-2015 10:24 AM
MS2PNP & Sequential Injection HexRX MEGAsquirt 4 12-02-2015 02:56 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:58 PM.