944Hybrids: 924/944/968 and 928 V8 Conversions
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HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 1:56 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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Post  xschop Tue Jun 09, 2009 7:50 pm

We need a good discussion on this. Anybody have a GM hydroboost to measure up?
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Post  Johnny Johnny Tue Jun 09, 2009 8:21 pm

Two other options to Hydroboost are:

1. Brake pressure multiplier - http://www.ecihotrodbrakes.com/brake_pressure_multiplier.html

2. Remote brake booster - http://www.parts123.com/parts123/yb.dll?parta~dyndetail~Z5Z5Z50000042b~Z5Z5Z502202~P429.95~~~~S2LI0KNEZV20913986950b~Z5Z5Z5~Z5Z5Z50000042b

Both are remote units, so we can mount the MC on an aluminum plate in place of the stock booster, and locate the supplemental unit in a more convenient location.

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Post  golfduke Wed Jun 10, 2009 5:24 am

awesome topic. I am currently running manual brakes w/ wilwood fronts and 951 rears... I'd been looking into Electric brake boosters, but they are damn expensive.

I would be willing to guinea pig the brake pressure multiplier at that price for sure.
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Post  golfduke Wed Jun 10, 2009 5:34 am

ok, just talked to ECI about the brake pressure multiplier, and he kind of steered me away from it. He said that the primary use for the BPM is for systems with a volume style brakes as well as pressure style on the same vehicle. He said that there had to be a pretty significant volume source for the unit in order to increase the pressure for braking. He said in his best suggestion, to go remote booster or electric booster....


Is this conflicting with what others are being told?
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Post  coctostan Wed Jun 10, 2009 6:25 am

Is there a reason why you guys are looking for alternatives to the BMW hydroboost setup?

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Post  golfduke Wed Jun 10, 2009 6:42 am

I'm not running power steering.
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Post  coctostan Wed Jun 10, 2009 6:46 am

Ah, that makes sense.

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Post  Dawgz83948 Wed Jun 10, 2009 7:21 am

golfduke wrote:I'm not running power steering.

Niether am I but the hydroboost works really well.
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Post  golfduke Wed Jun 10, 2009 7:55 am

Are you just running a PS pump for the hydroboost setup only?

I just hate to have to add it back to the car again, but I'll definitely have to address the problem before any serious tracking is done.
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Post  Dawgz83948 Wed Jun 10, 2009 7:58 am

golfduke wrote:Are you just running a PS pump for the hydroboost setup only?

I just hate to have to add it back to the car again, but I'll definitely have to address the problem before any serious tracking is done.

Yes, I put the pump back in just for the brakes. No leaks yet (although I probably just cursed myself). Do you have an LT1 or LS1?

NOW I DONT WANT YOU STEALING MY IDEA WHICH I STOLE FROM SOMEONE ELSE!!!!! I'll have to get my lawyers on you. Laughing
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Post  golfduke Wed Jun 10, 2009 8:01 am

neither, LS6 :p


I'll think about it. it might be my easiest play. Speaking of, we need to yank the hydroboost threads and put them over here somewhere.
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Post  m73m95 Wed Jun 10, 2009 2:34 pm

I was just going to say that.

I'd like more detail on the BMW setup. (That seems to be the best setup for our cars)

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Post  Johnny Johnny Thu Jun 11, 2009 3:56 am

golfduke wrote:ok, just talked to ECI about the brake pressure multiplier, and he kind of steered me away from it. He said that the primary use for the BPM is for systems with a volume style brakes as well as pressure style on the same vehicle. He said that there had to be a pretty significant volume source for the unit in order to increase the pressure for braking. He said in his best suggestion, to go remote booster or electric booster....


Is this conflicting with what others are being told?

OK, good to know. These options were just what I had found from doing research. I haven't tried either of them, since I'm still working on the motor side of things.

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Post  Johnny Johnny Thu Jun 11, 2009 4:04 am

m73m95 wrote:I was just going to say that.

I'd like more detail on the BMW setup. (That seems to be the best setup for our cars)

I keep getting conflicting opinions about hydroboost. Some say it's great for the street/track, some say it sucks. I wonder if it has something to do with specific models/years for the hydroboost unit? In the PH threads I don't think anyone specified a year - perhaps some had more problems than others?

Using a remote vacuum booster like the one from Parr allows you to do away with the PS pump (if you have manual steering) and plumbing. Of course, it is a little pricey.

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Post  golfduke Thu Jun 11, 2009 5:16 am

Johnny Johnny wrote:
m73m95 wrote:I was just going to say that.

I'd like more detail on the BMW setup. (That seems to be the best setup for our cars)

I keep getting conflicting opinions about hydroboost. Some say it's great for the street/track, some say it sucks. I wonder if it has something to do with specific models/years for the hydroboost unit? In the PH threads I don't think anyone specified a year - perhaps some had more problems than others?

Using a remote vacuum booster like the one from Parr allows you to do away with the PS pump (if you have manual steering) and plumbing. Of course, it is a little pricey.


Yeah, but when you consider the Electric Brake booster as it's only other option (hydroboost aside), the remote booster is less than half the price of the EBB Laughing

Re: Vacuum- Would the LSx produce the required 14lb vacuum if plumbing off the large source at the back of the intake? You know, the one that 90's to the drivers side that we all plug? If so, I'd be interested in trying it out.
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Post  coctostan Thu Jun 11, 2009 7:06 am

I don't think the PARR setup is what we need. I believe it boosts the brakes after the MC. That seems like a disaster to me. It would require significant effort to get it to work right.

The way I see it, you either hydroboost or engineer a complete manual setup. Hydroboost will be the best option for most and likely cheaper than an appropriately engineered dual MC manual setup. For ultimate braking performance, a dual MC manual setup with balance bars would be the way to go.

In fact, a great track setup would use XSCHOPs Lexus calipers up front, 951 front calipers for the rears, appropriately sized dual MCs, balance bar, and an ultra stiff pedal assembly. That thing would be very fast, but would obviously cost more than a hydroboost setup with stock brakes.

I have a feeling the BMW hydroboost is the best route for most though. $200-500 in parts and you don't have to reengineer the pedal or brake hydraulics. Given the BMWs use similar MC sizing and assuming their pedal has a typical 4:1 leverage ratio, the boost should be similar to the Porsche vacuum setup.

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Post  m73m95 Thu Jun 11, 2009 10:25 am

The problem I have with any vacuum boost setup is I don't think I will have enough vacuum to operate it.

I plan on a pretty hefty cam in my car. I MIGHT get close to 14in at sea level, but defiantly not if I take a trip to Denver.

I want to use the BMW hydroboost setup on my car, but the details are fuzzy (or I couldn't find them).

As was already said ... what specific years and models of BMW can be used? I've seen 80's 6 and 7 series cars. Does it need to be more specific, or did BMW use the same system on both series of cars for 10 years?

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Post  Dawgz83948 Thu Jun 11, 2009 11:15 am

m73m95 wrote:The problem I have with any vacuum boost setup is I don't think I will have enough vacuum to operate it.

I plan on a pretty hefty cam in my car. I MIGHT get close to 14in at sea level, but defiantly not if I take a trip to Denver.

I want to use the BMW hydroboost setup on my car, but the details are fuzzy (or I couldn't find them).

As was already said ... what specific years and models of BMW can be used? I've seen 80's 6 and 7 series cars. Does it need to be more specific, or did BMW use the same system on both series of cars for 10 years?

80's bmw 535 or 635. You will need the bomb and all the lines.
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Post  m73m95 Thu Jun 11, 2009 12:24 pm

Can you post some pics of your setup Dawgz?

And, thank you for the info.

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Post  Dawgz83948 Thu Jun 11, 2009 12:31 pm

Sorry about the speed. If you have an LT1 you want the high pressure line from a 95 Impala or Caprice v8.
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Post  m73m95 Thu Jun 11, 2009 2:50 pm

WOW ... I have a 26" widescreen monitor, and I still can't see that pic all at once LOL..

Thanks for it though.

Any changes for a LS engine? I know I need the pressure spring from a corvette pump, but anything else?

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Post  Dawgz83948 Thu Jun 11, 2009 2:56 pm

m73m95 wrote:WOW ... I have a 26" widescreen monitor, and I still can't see that pic all at once LOL..

Thanks for it though.

Any changes for a LS engine? I know I need the pressure spring from a corvette pump, but anything else?

I don't know, I have an LT1. I did not change my pressure spring but I also am not running power steering.
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Post  xschop Thu Jun 11, 2009 3:34 pm

does the BMW stuff match the 944 master?
I thought someone mentioned that.
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Post  Dawgz83948 Thu Jun 11, 2009 3:38 pm

xschop wrote:does the BMW stuff match the 944 master?
I thought someone mentioned that.

Apparently it depends. I'm using the stock one from an N/A 944. I think someone was having a problem with the turbo model.
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Post  coctostan Thu Jun 11, 2009 6:38 pm

I think a late turbo model was causing issues.

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