x_atlas0
Well-Known Member
Howdy!
A while ago, I acquired a S38B35 to put into my E9. It's been sitting, waiting, on an engine stand for a bit while I gather all the requisite conversion parts to switch from my current M30B35 / Motronic 1.3 / Getrag 265 setup. One of the things I noticed is the S38B35 E28 implementation used a hydraulic brake booster system, so there is not an equivalent intake vac source comparable to the one located on the intake manifold of the M30B35. I checked out the later implementations of the S38 (B36 and B38) and they have modified castings on the throttle body pair for 2 cylinders (looks like 5 + 6 physical, 1 being at the front) that includes a ~12mm vac line barb, which then goes to a unique dual-intake one-way check valve, then to the brake booster as normal.
I'd like to get the group's feedback on if it is better to go through the cost and expense of getting a later set of throttle bodies or if I should modify the ones I have by drilling + tapping the same post-throttle runners as on the later units.
Thoughts?
Here's a pic of the points on a S38B38 set of ITBs. You can see the 2 brass fittings on the upper right of the ITBs.
Here's the older set mounted on a M30. Notice it does not have those brass barbs.
A while ago, I acquired a S38B35 to put into my E9. It's been sitting, waiting, on an engine stand for a bit while I gather all the requisite conversion parts to switch from my current M30B35 / Motronic 1.3 / Getrag 265 setup. One of the things I noticed is the S38B35 E28 implementation used a hydraulic brake booster system, so there is not an equivalent intake vac source comparable to the one located on the intake manifold of the M30B35. I checked out the later implementations of the S38 (B36 and B38) and they have modified castings on the throttle body pair for 2 cylinders (looks like 5 + 6 physical, 1 being at the front) that includes a ~12mm vac line barb, which then goes to a unique dual-intake one-way check valve, then to the brake booster as normal.
I'd like to get the group's feedback on if it is better to go through the cost and expense of getting a later set of throttle bodies or if I should modify the ones I have by drilling + tapping the same post-throttle runners as on the later units.
Thoughts?
Here's a pic of the points on a S38B38 set of ITBs. You can see the 2 brass fittings on the upper right of the ITBs.
Here's the older set mounted on a M30. Notice it does not have those brass barbs.
.