justaguy

Hey Guys
I am trying to hook up the RPM feature on my traqmate where is the best or easiest place to attach the blue traqumate wire to the car to get a good signal?

Is there a possibility of damaging the traqmate if this is done wrong? Can I check the out put with an electrical meter befor I attach to the traqumate?

What should I check for amps? volts? Cycles?

Thanks
Sean

Jim Morton

Sean:

For logging RPM, I recommend using the MSD 8918 GMR pickup. You can use one of the low side coil wires for the MSD trigger.

I prefer the isolated sensor for logging as opposed to using the signal from the LH... especially if racing where a short could cause you a DNF.

Mike Frye

For the RPM signal off of the LH you could tap into pin 1 of the harness (Thanks to Ken- Porken one of our resident inventors for these pinouts):

Ken sells a plug you can put in between the plug and the LH so you don't have to hack the harness. It's called the 'Bridge-it'. I've got one that I use to pull the RPM signal and some other things (like idle and WOT) with my innovate setup.

32v

16v

76FJ55

I contacted Ken about a month ago about getting a Bridge-It, but he siad he is no longer making them. I believe he lost his salvge yard connection, and he indicated the time required to make one as cost prohibitive. So I ended um making one for my self, by salvage yarding a Saab computer and connector as the doner.

Mike Frye

CRAP! I forgot he said that Saab had the same connection. I just scrapped my daughter's Saab. I wonder if they still have it...

Sorry for the misinformation. It's still on the website so I thought he was still making them.

76FJ55

Select Saabs and some Volvos. there is a list of models in a thread. if you seach for LH2.2 and Saab I think you should be able to find it.

Bill Ball

What about using pin 14 on the round diagnostic plug, if this is an 89?

Brett928S2

Hi

I run 4 rev counters from Pin 1...lol , seems good to me....

All the best Brett

123

A thread on making one maybe?

76FJ55

I should have taken pic's of the process but didn't think of it till afterwards. I can take pic's of the finished product and try to describe the process, but it would have been much better to have taken pic’s along the way. I suppose I could salvage another computer and make a second one but without a hookup at a yard they're not cheap. When I got mine from the local yard I made sure to cut off the harness plug and leave it on the computer as it is necessary to make the adaptor unit. I also picked up a 25 pin D-sub connector from radio shack so I would have a organized interface to the adaptor. I then just put crimp D-Sub pins on the loose ends of my data cable so I can plug in or switch signals conveniently. By the way making one is a bit time consuming as well. If I can come up with a cheap computer I may consider making a second one and documenting how to make your own.

Hilton

+1 - this is where I currently have my WBO2 logger getting rpm signal from in my 89.

Although I do have the parts on my desk to assemble a 35-pin "bridgit" with pigtails off the LH.. so I will have a solution thats more easily portable (i.e. can use it in my 87's easily).

Z

If it's an '87 or '88 car, it would be pin #3 of the rectangular diagnostic connector.

If it's a 5-speed car, you should have an empty relay socket where the kickdown relay would be on an A/T equipped car. Terminal 31b of that empty relay socket is usually a quick and convienient place to just plug a male spade terminal into and get a tach signal from.

justaguy

Guys
The car is an 89 5spd with a motor form an 87.
I will explore the options
Thanks for all the suggestions
Sean