Let’s talk 850 N/A Throttleplate Modifications
Easy way to check is the diameter of the TB. NA 850s and the 960 have a 65mm throttle plate. If the S70 is the same then you’re in business. Any 960 throttle plate should work.
Ben850 » I’ve collected a couple 850 N/A throttle bodies and a few throttle plates over the months I’ve been pulling parts. I did this mostly in case of mistakes, and to be sure I had the right parts. I figured I would eventually do this modification.
Last week I found a ’94 with VVIS like my ’93 So the throttle body had the same vacuum attachments as mine. I brought that home, but never came across a 960 donor throttle plate. The extra throttle body was in case I did’nt like the mod, my original one is still in tact.
So I had a couple throttle plates to experiment with. Luckily I took my time and did a pretty good job of hand filing the obstructive area. I actually used a hand file that I had previously used to finish Formica edges. It was a little time consuming, less than two hours, but no mistakes.
So I did the battery disconnect reset and drove about twenty miles, city and highway. It felt like the ECU had learned the new setup by then.
What I can say, is that it has given it a consistent throttle feel whithout the flat spots it had before.
And my early N/A , having the VVIS manifold, had extremely noticeable peaks and valleys in the powerband.
It’s almost like a normal car now, ha.
Anyway I was never in a rush to do this mod, but I am not disappointed. I see no problems with it.
Have Fun.Replaced a few vacuum lines while I was there.VVIS type with vacuum tubes.This is all the material that was needed to be removed.I tapered the leading edge smoothlyI seem to be doing a lot of things manually lately.