PorKen

I was just comparing the stock specs against your chart, and I figured it was 3°, given the peak has gone from 6000, to 6300ish. I've found roughly a 100rpm:1° shift when advancing, but I'm pleased to see proof that it appears to work for retard, too!

I'd like to squeak my '86.5 over 300RWHP (even if by using STD) by only tuning what I have now.

Z

The cam timing change was done a few years ago. Not long ago I did some simulations of different cam timing changes with the Engine Analyzer Pro software. Coincidentally the the 3 degree cam timing retard gave the power curve that I most would have wanted of the ones in the simulations.

IcemanG17

You gotta take me for a ride at SATL!!!

Wade T

Guys please don't flame me, but posting G-tech logs as actual 1/4 mile runs? What about taking the car to real 1/4 mile track and getting a REAL time slip? I only ask because this type of thing would be laughed at in other car communities.

mark kibort

Got it. Thanks.

But, it doesnt explain the totally different curve. even the final rpm is different. (ie 7000rpm vs 6500) . SAE vs STP wont change the shapes of the curves, or the rpm colllection points. I think that was my main point there. the re calculated data and creation of the SAE curve was dramatically different in shape.

MK

fabric

Not sure if you ascribe to the attitude of the other car forums, or are just bringing it up.

AFAIK, all the car magazines use these types of tools nowadays, although probably the higher end models. After running these devices along side the actual real world tests, they found they were getting the same results with the electronic testers. Both Car & Driver and Road & Track wrote about when they made the change.

If you consider that new commercial airplanes can take off, navigate to a destination, and land without any human involvement, it's clear the technology exists to accurately measure the performance of an automobile.

Tony

Put your suit on, as i have ran my GTECH PRO RR simultaniously on 1/4 mile dragstrip with " a tree" here in Vegas (LVMS). The times are always within appx 1/10sec and 1mph of one another and very consistant. Ive i have nearly 2 dozen runs Id guess? Compared against a known it has proven more than accurate enough for measuring performance in my book. Now, the dyno feature, yes, i would agree with you. YMMV

Tony

Hey now!! SOMEBODY has to push the buttons,program it, engaged the autopilot and drop the gear and flaps...and who sets the temp back there in the cabin Thats a lot of work between various articles in Excellence and the Wallstreet Journal!




back on topic..i wonder if this thread will lure some Turbo numbers out of the woodwork

Shane

OK I'll play.

I have yet to see these numbers beat by any other '85-'86.5 boosted sharks:

402rwhp 383 rwtq
1986 928S auto, x-pipe, Andy Keel setup with Whipple 2.3 twinscrew intercooled @ 7psi of boost. Airfuel set at 12:1



And for the stock or non-boosted numbers, Porken has me beat here, along with some others.
281 rwhp 278 rwtq
1986.5 928S 5sp, aftermarket chips, all stock otherwise, with cats smog pump, and all the other power robbing goodies.

Tony

Darien's nipping at your heels Shane.

The weeker run was when his cams were WAY out of sync. We used the Porken tool to set them ....producing the better run.
Running lean on top so the operator backed out early. He now has the 044 pump and the Fuel pressure to keep things going...havent dyno'd it since.

fabric

You forgot looking dapper in a nice uniform and providing soothing messages and anecdotes from the flight deck.

Shane

What boost level is he at now?

I forgot Darien was getting close!! But still no cigar, lol!

I plan to resurrect that system off of Heidi and plant it on one of my 5sp 928S. I'd like to incorporate some of the new subsystems that DR has brought to the table and slap a custom Sharktuned chip in there and see if I can get that elusive 500rwhp mark that I was all set to get when Heidi burned.

PorKen

Using SAE, my numbers were 9ish HP/TQ less. With an X-pipe, your point five would probably make similar numbers.

Shane

True but you have more loss through your slushbox then my 5sp, so me thinks they would be pretty close.

PorKen

With the five speed and proper exhaust, you should pull over 300 with some tweaking.

'86.5 is the dominator!