Timing and Spool rate

[JFairman]

Originally Posted by Porsche 935

I also noticed that the shift times are way too slow. Sat in car and realized the shifter is too low and arm is fully extended when trying to shift to 3rd. Anybody cut and extend their shifter arm? It has a short shift. I could change to aftermarket shifter but do do want to loose access to e-brake or throttle arm.

Previous owner had a Weltmiester short shifter installed in my car and the shorter shift is nice but 3rd gear was still farther away than I like.

I removed the shifter and removed the JB weld and then brazed the short shift rod on with brass rod. Then I heated up the steel shift rod where it bends back red hot with an acetylene and oxygen torch and bent it back a little farther and a little to the left so the shift knob was a little more to the left but didn't hit the right front corner of the driver seat when in second gear.
I put an old wet towel on the driver seat first so it wouldn't catch on fire.
It worked well and I like it much better now.

After all that the leather boot covers the burned up paint area on the shift rod or you can remove it again, sand it smooth with 320 or 400 grit, and spray it satin black so it looks nice.

[quattrorunner]

Originally Posted by Porsche 935

No, I'm not sure. Only other alternative is more sticky tire or programmable boost based on gears. Pulls were made in 2nd since car pulls 108mph in 2nd, small runway not long enough for third(180mph).

OMG! Your gears are tall.

[Porsche 935]

Sorry, Thanks Tippy. Want to talk to a friend of mine who runs a stroker Grand National. I think he pulls timing in first and second. I can't do it gear by gear though. This gear box was set up to run the standing mile. Still works good on the street, like a 3 speed. 2.25 1st,1.25 second, .76 third, .51 fourth.

[Porsche 935]

Pulling timing has not worked. Next option is race tire or programmable boost controller. Any one using a programmable controller?

[smurfbus]

dont you have efi? if there is no boost for gears or speed then you need to get a controller that has its own speed sensor.

[Porsche 935]

Mine is a manual knob right now. I really want to keep the power in the car and work on getting it to the ground.

[GJF]

Where is your AFR's before boost onset?

[Porsche 935]

12.8 -13.0 : 1

[GJF]

I would fatten it up a tad. Typically less timing will boost faster but make less power. A little less timing and lean not so much. Leave the timing alone and give her just a hair more fuel before boost onset.

[Porsche 935]

Thanks, I tried that. With the longer gears, the faster it spools the quicker the wheel speed and the more traction loss. Trying to take another route now with either variable boost per gear or really sticky tire. Loosing traction at 20 lbs boost now, so turning it up to 22- 24 lbs will be impossible if I can't get it to hook. Going to add more wing at higher speed to see if more down force helps also.

[gumba]

Second for the Wevo w/tall shift knob. He was developing a "tall boy" shifter, not sure of the status, but may be worth a call.

[smurfbus]

I think for drivebility you need to control boost before stickies. has anyone installed speedsensors on front hub?

[Porsche 935]

Anyone using the turbosmart electronic controller?

[GJF]

Understood,
Greedy use to be the controller of choice. But ever since boost control was added to just about all EFI systems it put a hurting on their parade.

[Porsche 935]

Sent a message to one company. I think I found one where boost can be changed with a switch with 6 settings. Can hook the switch to shifter or clutch pedal and change up as conditions permit and use lower setting in poor conditions.