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Dutch924-racer · Joined: 23 Jul 2007 Posts: 1081 Location: The Netherlands

I converted my 924 turbo to 944 turbo calipers.

Is the 944 turbo brake booster bigger ?

I also saw a 928 one that is 10 inch. Will this fit ?
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937 trackday car
Series 2 engine
951S turbo and intercooler
Fast road camshaft
Forge recirculation valve + boost controller

924RACR · Posted: Sat Feb 05, 2011 7:24 am Post subject:

I'd be more worried about the size of the master cylinder than the booster (though I'd take the whole thing, of course)...

I don't have any data about the sizes, though...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

peterld · Posted: Sat Feb 05, 2011 7:27 am Post subject:

Never had a problem with the std. booster, but as said above, the 951 master cylinder is essential......you now have 16 pistons to control.
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80/81 932/8 ROW

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Dutch924-racer · Joined: 23 Jul 2007 Posts: 1081 Location: The Netherlands

I now using the two step aloy 924S/944 master cylinder, it is 23,8mm (and rear 19mm)

If i look up the 944 turbo one, it is also 23,8mm but 20,6mm rear. So the difference isn't very big.

I use the car for trackdriving, so most brake power has to come from the front. So I doubt the turbo master cylinder is a upgrade for me.

(I will be using a bais valve to adjust the brake balance)
_________________
937 trackday car
Series 2 engine
951S turbo and intercooler
Fast road camshaft
Forge recirculation valve + boost controller

924RACR · Posted: Sun Feb 06, 2011 2:03 am Post subject:

Ah, OK then, it's good - the extra volume for the rear should help give you more to work with to adjust the bias... stock M471 setup doesn't really need any adjustment of the bias, in my experience - doesn't put enough pressure to the rear to need it reduced... even juggling the pad compounds a little...
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype