HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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LS1 Tach mod

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LS1 Tach mod

Post  cfgioja on Thu Sep 09, 2010 1:59 pm

Curious, People have figured out the LT1 tach mod.

Does anyone have a way of modifying a Tach for a LS1/LS6 motor?



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Re: LS1 Tach mod

Post  Porch on Thu Sep 09, 2010 4:57 pm

Step 1: Strip 944 tach wire
Step 2: Twist wire together with LS computer tach output
Step 3: Cover with electrical tape
Step 4: Drive.
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Re: LS1 Tach mod

Post  944-LT1 on Thu Sep 09, 2010 5:41 pm

Laughing Laughing Laughing

Solder too maybe? Laughing

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Re: LS1 Tach mod

Post  cfgioja on Thu Sep 09, 2010 7:22 pm

there is nothing else to it? I was under the impression the tach need modifying too for an ls1. Guess I need to keep up with you guys alittle more.
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Re: LS1 Tach mod

Post  cfgioja on Sun Nov 21, 2010 10:41 am

Back on this subject as I will be putting my dash back together. Which wire on the cluster is the tach wire? I have a wire from my PCM that says tach, I just need to hook it to the right wire on the car now.
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Re: LS1 Tach mod

Post  cfgioja on Sun Nov 21, 2010 7:36 pm

Anybody know what wire to splice into for the tach. I have the cluster out and am looking through the chilton, any help would be nice.
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Re: LS1 Tach mod

Post  944convert on Sun Nov 21, 2010 8:59 pm

for the late dash cluster, looks like plug "B" pin 3 GN/BK...is the tach input.

it comes from an 8 pin connector by the original DME (with 3 pins wired/used) pin # 2

at least per the schematics.

probably just a pulsing ‘ground’

surprised nobody with better knowledge has jumped in yet.

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85.5 is Easy

Post  xschop on Sun Nov 21, 2010 9:08 pm

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Re: LS1 Tach mod

Post  cfgioja on Sun Nov 21, 2010 9:15 pm

I know there was a post out there some where but it didnt pull up when searching for it, thanks guys.
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Re: LS1 Tach mod

Post  cfgioja on Mon Nov 22, 2010 12:45 am

I hooked up the wire and my tach works but I wonder about the accuracy of it. At idle like a chopper bike it says it is running a 2k. I doubt that very much But it revs up as I hit the gas and when I put it in first the speedo started kicking up alittle. Since it is still on stands I didnt want to go crazy with it.
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Re: LS1 Tach mod

Post  Porch on Mon Nov 22, 2010 10:07 am

Has your computer been monkeyed with? Stock, the computer outputs a 4-cylinder tach signal. If someone has modified the computer, they might have set it to output an 8-cylinder tach signal. That's what happened to xschop...

Glad it's running though!
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Re: LS1 Tach mod

Post  cfgioja on Tue Nov 23, 2010 10:58 pm

It has been modified, I will ask John at speartech if that is what he did. Thanks for the info.

Thanks for the support too.
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Re: LS1 Tach mod

Post  cfgioja on Wed Nov 24, 2010 12:42 pm

John Spears got back with me:

Collin,

1) 202 on, 197 off. (temp for primary fan)

2) Yes, Tach set to 8 cyl output.

3) No cam changes made to your PCM program. No cam specs provided. (figuring out if it needs a tune to match my new cam)

Thanks,

John
Speartech Fuel Injection Systems, Inc.

so when I go to get a dyno and tune run I can reset the tach signal right?
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Re: LS1 Tach mod

Post  Porch on Wed Nov 24, 2010 1:29 pm

Egg-zackary!
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Re: LS1 Tach mod

Post  cfgioja on Wed Nov 24, 2010 8:13 pm

now I have to keep it under 3500 rpm so I dont break the Tach at 7k. lol
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Re: LS1 Tach mod

Post  the951racer on Tue Jan 24, 2012 10:44 am

So what is the best way to set up the tach on a 88 951?

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Re: LS1 Tach mod

Post  the951racer on Tue Jan 24, 2012 10:50 am

Disregard the above ^....I found that the LS1 runs on the 4cyl. tach. signal just took me a minute to find it.

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Tach

Post  fliermike45 on Tue Jan 24, 2012 10:56 am

On my 88 NA I connected the PCM tach output to the green/black wire on pin 2 of the 8 pin connector under the passenger side of the dash. This connector originally went to the Porsche computer.
Porsche Tach works fine.

To confirm this, Page 8 of the 88 turbo wiring schematic shows the same hook up.

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Re: LS1 Tach mod

Post  the951racer on Tue Jan 24, 2012 11:57 am

fliermike45 wrote:On my 88 NA I connected the PCM tach output to the green/black wire on pin 2 of the 8 pin connector under the passenger side of the dash. This connector originally went to the Porsche computer.
Porsche Tach works fine.

Thanks for the info. Although I'm not ready for wiring quite yet, I'm gathering all the info I can.

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