Charley B

There goes Jim, always spoiling our fun with logic and responsibility.

Jim bailey - 928 International

I have very little emotion about other people's decisions

pagani

Very nice car whit some proper engineering i really dig your car.
Congrats

Panzer9

I've got my copy... fascinating engineering & superb execution! Not to look @ the "glass- half- empty", but it almost seemed to me to point out several inadequacies of the 928. Kinda like- look at all the **** this guy had to do to the 928 to make it a real BADASS. No negative reflection on Mr. Ott whatsoever.

atb

Not entirely true Panzer. Basically, the 928 has a lot of defeciencies for hard track use. Louie investigated those and remedied them. At face value, as a GT cruiser, the 928 is totally overbuilt. We expect a lot out of our sharks, much beyond the parameters of what the engineers designed for, so in that respect I'd admit there are inadequacies, but if you're just commuting a stock 928 is going to be more than enough.

H2

This issue of Excellence is well worth having the ORIGINAL article. It's still on some newstands. Buy while you can.

H2

Black Sea RD

Hi Panzer,

Have you read about all the re-working and tweaks the 911 guys do to their cars of the same general vintage to make them "BADASS?" Talk about having to overcome inadequacies and in the end most of them would be eaten by Proffessor Ott's monster.

Adam hit it on the head with his reply.

Regards,
Constantine

Carl Fausett

Congrats, Louie.

Getting published in Excellence is no small feat!

I completely agree with those who have said the more positive press we can get on the 928, the better it is for all of us (and our car's value).

I look forward to getting my copy too!

Dave H.

nice work Louie. it should'a been on the cover...

Panzer9

True Dat! Like most things- we scrutinize what were closest to. Tons of 911- have undergone similar upgrading- Not trying to hate. Mr. Ott is an innovative, practically-minded genius. I plan on utilizing his Lomas x-pipe!

Louie928

Thanks guys. I think Adam was right on. All the stuff I did isn't necessary. However, once headed down the road toward the goal of max performance N/A, it seemed like it all of a sudden was necessary to make those changes to have a reliable package. I like to solve problems too, even if they are small ones. I took a 700 mile trip last weekend and it sure is fun to drive. I should change a couple things though. I'm convinced I did go too far with the cams in the effort to reduce torque and I think the exhaust cam has too much duration. The engine really isn't happy in any gear when under 55 mph. The engine characteristics are that it wants more open throttle. It should have the 2.2 rear axle ratio rather than the 2.73. It's a bear to drive in traffic. The clutch is not forgiving and keeps you alert in requiring rev matching on downshifts and wants quick upshifts too. Other than those changes, it is working out fine and I think well worth the drive even at 16-17 mpg. I'm still tweaking the tuning even after a year and a half and countless hours. The only trouble spots left are heat soaked hot start, and quite a lot of popping out of the exhaust when backing off the throttle. I added a fuel rail temp sensor and modify mixture based on fuel temp to fix the heat soak problem. I can cut fuel under deceleration for the exhaust popping, but it is then very difficult to get a smooth transition back when slightly opening the throttle. It tends to come back on with a jerk. Timing changes help with that too, but for now it is still pops and crackle when under 2500 rpm. No problem on the highway, but should be quieter in the city. The very loud brake squeal from the Hawk Blue pads sort of drowns out the exhaust sound. I didn't make it to drive in traffic so it's all good overall.

Carl Fausett

You're not alone: our white track car also had trouble with heat-soaked hot starts. A separate fuel pump switch helped. Before turning off the ignition, we shut off the fuel and let it die. Then hot starts are much less a problem. Maybe that would work for you too if you are not already doing it.

I'm sorta glad to hear the Hawke Blues squeel like nuts in city driving. Glad its not just me...
But they do perform like throwing out the anchor!

Tony

If its vapor lock wouldnt you want to keep the pump running to circulate cool fuel through the rails and back to the tank. On many fuel injected airplanes(especially flying in the hot SW) it was my practice to shut the motor down then run the fuel pump for 20-30 secs to cool the fuel rails/lines..never had a problem with vapor lock or hot starts doing this.

Carl Fausett

I should have mentioned the car I am refering to is CIS, not EFI.

Louie928

Hi Carl,
Turning the fuel pump off before shutdown may have worked for me. I wanted to keep the operation as normal as possible so I didn't try that. Running the fuel pump before a hot start for about 2 minutes would cool the fuel rails & fuel enough so I could get a normal start. That wasn't too convenient either. My fuel rails are large aluminium and take a while for the fuel to cool down. Gasoline doesn't conduct heat very well as compared to water. After experiencing this, It was readily apparent why the Porsche engineers used the thin steel (insulated) rails to keep thermal mass minimum and better control of fuel temperature. For me, the AFR would go to 18-19:1 shortly after starting and the engine would die. The DTA ECU I use does have a start enrichment program to provide more start fuel at different engine temps, but it is only effective to a max of 1000 engine revs after a start and that wasn't long enough. It isn't needed at all for a hot start when the shutdown period is less than 5 minutes. Since it was fuel temperature that was the root cause, I fixed a temp sensor to the fuel rail and fed that into one of the unused inputs of the DTA. Then I figured out a fuel temp compensation table to add fuel vs. fuel temp. It's surprising how long the underhood temp stays high after a shutdown on a warm day and how much fuel has to be added for fuel temps above about 60C.