944Hybrids: 924/944/968 and 928 V8 Conversions
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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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Proportioning valve  Empty Proportioning valve

Post  jpkinerk Sun Jul 12, 2015 6:48 pm

So the car is almost sorted and I'm looking for my first track day Aug. 1st at Putnam! Last thing to address is the brake bias. Currently I'm running a 5/18 proportioning valve, but it's still trying to lock up the front brakes under hard braking. Should I try a 5/33? 

I'm running turbo calipers in the rear, and LS430 in the front with BMW hydroboost.
jpkinerk
jpkinerk

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Join date : 2013-02-13

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Post  Rich L. Mon Jul 13, 2015 10:31 am

Well, locking the front first is what you want. But 5/33 is the next step so trying it would be good. But if it wants to lock the rears then, you've gone to far.

For myself, I tried the 5/45 and it locked the rears. Then I tried the 5/33 and it was good, locking the fronts first. This was with m030 brakes and the stock 944 master cylinder. I've since gone to dual masters with a balance bar.

Rich
Rich L.
Rich L.

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Post  jpkinerk Mon Jul 13, 2015 3:55 pm

Thanks, Rich. And you're right, I'd definitely rather have the fronts locking up than the rears. I guess it just seemed like they were locking up just a little too soon. Or perhaps i just don't have an aggressive enough tire. My research indicated it might be worth trying the 5/33 as well, so that is helpful. 

Cheers,

JP
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Post  Rich L. Mon Jul 13, 2015 4:19 pm

Yeah, you should be able to feel the rear hunker down under braking. If you car is nose diving and not really stopping yet when a front locks, definitely try the 5/33. I've also gone to a square setup, same size front tire as rear, to get more front grip.
Rich L.
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Post  jpkinerk Mon Jul 13, 2015 8:27 pm

Awesome. That's good to know, I wasn't sure what the characteristics of the car should be under that hard of braking. I've wheeled some fast cars, but I'm new to the track. +1 on the square setup though, I'm running 255's all the way around. 

Thanks again. Now to hunt down a 5/33.
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Post  jpkinerk Wed Aug 26, 2015 8:19 pm

OK. So I swapped out the 5/18 for a 5/33 and it's definitely better, however, when I give the brakes a good tap heading into a tight turn, I'm still locking the fronts. Obviously, I'm not totally standing on them since I don't have ABS, but they still feel like they're locking pre-maturely. 

Should I go up yet another size with my proportioning valve? Perhaps just try plugging the rear line right into the master cylinder?
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Post  jpkinerk Sat Sep 12, 2015 9:01 pm

Bueller? Bueller? 

I'm running out of ideas here. Is it maybe just the fact that i don't have ABS? They slow the car down really well, but I just feel like I should be able to step on the brakes harder than I am. I'm afraid on track when I go to stab the brakes heading into a turn that I'll just lock them up.

Shocked
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Post  docwyte Sat Sep 12, 2015 9:36 pm

Install a Tilton adjustable proportioning valve. I have a spare 7 position one if you want it and I think I'll have my infinitely adjustable one available soon too, once my 951 MC gets installed...

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Post  jpkinerk Sun Sep 13, 2015 8:48 pm

Thanks, doc. I'll definitely take you up on that. PM me with details and I'll paypal you. With that I can also hopefully diagnose if perhaps there's something wrong with my rear calipers.
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