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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Rich's LS powered 944 track car

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Re: Rich's LS powered 944 track car

Post by Rich L. on Sun Mar 02, 2014 3:14 pm

I've got everything wired-up and connected. I've edited my prior post having learned that the ANTI-LOCK light in the dash actually wants switched ground, making the relay unnecessary. So now it lights prior to start-up and I'm ready to put wheels on and take it out for a drive. It's raining steadily today so not a bad time to hit the city streets and see if I've got ABS.

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Re: Rich's LS powered 944 track car

Post by Lemming on Mon Mar 03, 2014 11:45 am

Let us know if it works!
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Re: Rich's LS powered 944 track car

Post by Rich L. on Tue Mar 04, 2014 11:31 am

Okay, from new information on Rennlist I have to revise things to apply power to pin 10 once the engine is running. I wondered how the pump would know to turn off the abs light after startup like you see on other cars. Unfortunately, this kills my VSS idea as I only left that one extra long wire in my harness which I'll now move to pin 10 so I don't have to redo the entire thing.

I hadn't gotten around to a test drive anyway. Perhaps today after these changes.

Rich
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Re: Rich's LS powered 944 track car

Post by Lemming on Tue Mar 04, 2014 12:13 pm

Keep us posted, I'll need to correct 10 based on your last post.
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Re: Rich's LS powered 944 track car

Post by Rich L. on Tue Mar 04, 2014 4:42 pm

Hmm... I'm seeing 16 volts on the dash gauge anywhere above idle. This even with the new ABS wiring disconnected. With the ABS connected, the new pump doesn't like the high voltage and pops the ANTI-LOCK light. But even with new connections for pins 10, 15 and 21 unplugged it doing it.

So, this must have to do with the new Odyssey battery. I also swapped out the 4 gauge wire from the battery to the disconnect switch for a 0 gauge wire. And I replaced that battery disconnect switch with a brand new Lokar one. Any ideas?
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Re: Rich's LS powered 944 track car

Post by Rich L. on Tue Mar 04, 2014 6:09 pm

ABS !!   It worked !!

So the voltage problem was me trying to leverage the battery's chassis ground point for the ABS pump. Apparently the voltage regulation didn't like that. I moved the ABS's ground wires to another spot on the chassis and normal charging voltage and normal ABS light behavior.

Then I started down my steep, wet, cold hill with the bias would all the way rearwards, stomped on the brakes and the car stopped. I could feel the pump pulsing in the pedal and heard a groan that was more subtle than I was expecting. But the car stopped quickly with no lockup. I've not gotten the front channels into ABS and don't want to right now as I've got new rotors on the front that need some seasoning.

ABS !!    Hurray !!
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Re: Rich's LS powered 944 track car

Post by docwyte on Wed Mar 05, 2014 8:37 am

And your ABS warning light on the dash works and it's wired as you have it above? Time to get mine installed...

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Re: Rich's LS powered 944 track car

Post by Lemming on Wed Mar 05, 2014 4:05 pm

Rich,

Any reason that I cannot just hook 10 into my painless switched fuse box? I would then just turn on the ABS system after starting the car each time to get around the alternator delay. I ask because this is easier than tapping into the alt trigger (no original porsche wiring in my car).
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Re: Rich's LS powered 944 track car

Post by Rich L. on Wed Mar 05, 2014 4:30 pm

The reason I read that it's wired to the alt is to delay the ABS' internal check sequence until after startup. This because of a higher failure rate of the checks when done during starter cranking. I don't know about you, but I tend to key over and wait a few seconds before hitting the starter anyway. A habit leftover from driving boats for years when you needed to let the fans clear the bilge before cranking.

I'm thinking about revising my wiring anyway as now I'm getting no charging. With the grounds messed up I was overcharging, seeing 16 volts on the gauge. But now I'm only seeing 10 volts and the battery is under 50% on the charger after only 30 minutes of driving around. Is this more ground problems? Perhaps the system isn't liking the ABS on the alternator trigger. Or maybe I killed my voltage regulator in 3 minutes of idling at 16 volts. Dang!

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Re: Rich's LS powered 944 track car

Post by Lemming on Wed Mar 05, 2014 4:46 pm

Ok, abs light is hooked up and when I put 12v to 10, I get no light, that's hopeful.

Better have your alternator checked.
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Re: Rich's LS powered 944 track car

Post by RS Technic on Wed Mar 05, 2014 10:21 pm

Hey Rich,
I'm sure your aware of this, but just incase...
Odyssey does make a 16 volt battery for racing.

When you mentioned the 16volts you were receiving this popped into my head as a friend of my did indeed get a 16volt instead of a 12volt by accident.

It smoked the regulator on his alternator.

Replaced it (regulator) and the battery and was good to go.

As I said, I only mention it as I have experienced it before.

Best of luck tracking it down.
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Re: Rich's LS powered 944 track car

Post by Rich L. on Wed Mar 05, 2014 11:47 pm

Interesting. This PC925 is a 12v though. Thanks for the idea.
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Re: Rich's LS powered 944 track car

Post by Rich L. on Thu Mar 06, 2014 4:13 pm

Tested the alternator and it was a bad voltage regulator. Replaced and normal charging is restored. The ABS light comes on with the ignition, stays on through engine cranking and then goes out right after the engine starts. Sweet!
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Re: Rich's LS powered 944 track car

Post by RS Technic on Thu Mar 06, 2014 6:12 pm

Good to hear it was something simple (and reasonably inexpensive).
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Re: Rich's LS powered 944 track car

Post by docwyte on Mon Mar 10, 2014 3:57 pm

Rich,

I just ordered the plug/harness from Oklahome Foreign. Does the new Boxster unit have it's own control unit? Or are you reusing the 944 ABS control unit?

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Re: Rich's LS powered 944 track car

Post by Rich L. on Tue Mar 11, 2014 7:52 pm

My car didn't have an existing ABS brain. As Tim told you, the Boxster pump has the brains included.

I've just finished adding new rear shocks with 100 lb helper springs. The rear I raised an inch and the front half an inch. Corner balance and alignment is in the morning at my race shop. Track day Friday if the weather holds.  Cool 

Rich
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Re: Rich's LS powered 944 track car

Post by Rich L. on Wed Mar 12, 2014 12:42 am

Off to the alignment shop in the morning. Will ride the bike to work from there and then back when the car's done. No 911 racer is gonna get his bike in his race car. Wink

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Re: Rich's LS powered 944 track car

Post by Rich L. on Sat Mar 22, 2014 12:59 am

Ran the car on track today, beautiful sunny day in the PacNW. The ABS worked great and made a big difference. The car feels much more solid and confidence inspiring under braking. And the new rear shocks and raised rear spring rate worked well, found a nice balance with only a single tweak of the front swaybar. Happy. Tired.
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Re: Rich's LS powered 944 track car

Post by docwyte on Fri Apr 04, 2014 4:35 pm

Rich, how did you bleed the brakes/ABS pump once in? Is there a way to manually force the pump to cycle? Either with a OBD2 tool or by jumping one of the wires?

Since it's bone dry I know I'm going to have to get it to cycle a few times to suck in fluid and get all the air pockets out of it. I've got the old pump and controller out. I'll be saving a few lbs with this conversion, the old pump weighs a ton!

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Re: Rich's LS powered 944 track car

Post by Rich L. on Sat Apr 05, 2014 1:53 pm

Hey Doc. From my research, these pre-PSM pumps don't require a cycle to bleed. The later ABS/PSM systems are more complicated internally and have "secondary" fluid paths that require an OBD tool to cycle. My experience matches, the pedal feels good with only a thorough pressure bleed.

Rich
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Re: Rich's LS powered 944 track car

Post by docwyte on Sat Apr 05, 2014 1:57 pm

Ok, that makes life easier. Did you leave the check valve on that one line on he pump alone? Did you then also run the check valve that's on the chassis brake line?

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Re: Rich's LS powered 944 track car

Post by Rich L. on Sat Apr 05, 2014 2:04 pm

Check valve? Are you maybe looking at a proportioning valve? You'll for sure need only one and I'd stick with the 944 one and not switch to the Boxster one. I don't use one at all as mine has dual master cylinders with a balance bar.

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Re: Rich's LS powered 944 track car

Post by docwyte on Sat Apr 05, 2014 2:26 pm

I've got a tilton adjustable pro portioning valve, so I don't need any of the porsche ones. I'm not sure what this thing is, but it's connected to a line coming out of the abs pump and is mounted on the side of the pump.

Then on a hard line mounted to the inner fender of my car there's another check valve looking thing...

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Re: Rich's LS powered 944 track car

Post by Rich L. on Sat Apr 05, 2014 4:54 pm

The way my Boxster pump came was with a hard line from the rear input down to the side where a prop valve was clipped into a white plastic deal. It was 3-4 inches long, about 1/2" diameter metal cylinder. Delete that, you don't want the Boxster prop valve.

You've got the Mustang master, right? You might have the 944 prop valve in addition to the adjustable one. If you're happy with the front/rear balance right now, don't change anything. Just insert the new pump in place of the old one leaving everything else alone. Standard practice in race car development, change only one thing at a time.
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Re: Rich's LS powered 944 track car

Post by docwyte on Sat Apr 05, 2014 6:30 pm

Gotcha. Ok, I'll definitely be removing that. Brake bias is challenging, I think I have too much front brake bias, but I can't more more to the rear without issues. I don't know if I have the 951 prop valve in place or not. Where is the stock 951 prop valve?

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Re: Rich's LS powered 944 track car

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