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Join Date: Oct 2012
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turbo proof gearbox bmw s14,s38,m30,m88
I was looking for a long time for a good and sheap replace gearbox for the high power s14/m30/m88/s38 engines.
the normal getrag ones are strong,but when starting with heavy turbo's,and high nm outputs the stress on the boxes is to high after a time.
the older type getrag are more and more difficult to find.and prices go up.
its cheaper to find a other zf,then rebuild youre getrag.
so after long looking 2 type boxes are very strong.knowed for very high power output and are sheap to find.
the boxes must be used with a single mass flywheel and a sachs 765.the rest keeps Original bmw
the diesel box gs5-39dz with 1 gear 5.24 and 2 gear 2.91 not bad to a little long gearing.
the petrol box s5d320z with 1 gear 4.20/4.21 2 gear 2.49 a little better gearing.
I know from my new gearbox specialist that the internals are allmost the same,only other ratios.
the problem is,it will not fit together to a s14/m30/m88/s38
I found a man that have build a special jig,that the 2 bellhousing are cut with cnc,exactly are centered on the crankshaft.
and then welded together with zero play.100% center balanced welded.
the center jig keeps the center exact(0.01 tolerance).and the 2 bellhousing are bought so machined that they laying on each other with a hear fraction between.perfect for welding.
my box is under construction.I post all the pics here.and test it on my turbo M88/s38
on the same moment I am building a transaxle gearbox for the bmw m60,with a audi box.for a rear engine project.
that man have more jigs to build them on other engines to.
but I have promised him.first mine box,and test it.and then put his email info on this post.
when somebody needs more info please mail me.