Originally Posted by JFairman (Post 5014365)

I left both vacuum lines on the '87 USA distributor and turned it clockwise advancing it as far as the adjustment slot allows without pulling the distributor out and reindexing it one more gear tooth.

I'm scared to remove the vacuum retard line so far because I don't know where the timing would go under boost then. Just too risky.

I need to get some kind of degree wheel or tape that can be attached to the crank pulley and has the degree marks on the edge so it will be visable when pointing a timing light down at it before I experiment with timing safely.

At the moment I have the MSD 8762 set to retard timing 2 degrees for each psi of boost starting at 5psi but I will probably change that a little with more experimenting. I run maximum boost 1 - 1.1 bar or around 15 psi with street gas, usually chevron high test.

The motor has stock 7:1 pistons and cylinders, 964 cams, Garretson long neck half bay intercooler, and B&B headers.
It has fuel enrichment with a modified IA fuel head and Brian Leask adjustable WUR to control it.

Originally Posted by DDDD (Post 5014421)

My third gear is the factory third. The overall ring and pinion was just changed to the 8/41 from stock. I think you would have 9/38 ring and pinion stock....

I can tell you that my 3rd redlines at 115 or so and that is as short as you would ever want to go. I think 120 mph might be perfect for full acceleration.

Bruce anderson's 911 performance handbook has all the possible gear ratios and mph in the back.

Looking at the book a 26/26 gear at 6800 rpms gives 120 mph with a 9/38 ring and pinion. That would be devestating acceleration and just a touch taller than what I have. A 27/26 would put you at 126 mph and stock I think is about 134 mph at 6800 rpms. The 126 mph gear seems like a very nice compromise because your gear would not seem too short either.

You would want to double check those gears numbers yourself...

Originally Posted by JBL930 (Post 5011534)

Tom, that second run gives you a 60-130mph of 17 seconds!! That's really slow! You can hit about 132-134 mph in 3rd with stock wheels and a stock 4 speed, you need to hit the rev limitter but you'll get there.

Originally Posted by tj930 (Post 5016567)

Mate, I know you moan about me 'short-shifting' but the car had a rotor which was too small for the Distributor cap (and sparking and shorting out at high RPM), SC Cams (which have nothing left by 6k), fuel pumps which weren't delivering enough fuel, an engine that hit 12.0+AFR by 6k, and a Distributor wasn't Advancing/Retarding by the full amount... Also to find where 0.16Bar Boost Pressure is leaking.

And that drag may have been run slightly up hill (I don't remember) - think I was more concerned with 0-60, 0-100 and standing 1/4. But, with reference to the original postee's 60ft time, that was done in ~2.2 seconds (and not 2.5 minutes! ;))

Originally Posted by wjfk32 (Post 5000321)

60-130mph--Is the real test...
Walt