BC

Which digital brand do you use? I'm going to set up so not much info is always shown, after all the tuning is done, but I will still need some stuff like boost level, trans temp, oil temp, AFR.

Just to see if parameters are not being met, like in a software or hardware problem in the EFI.

bd0nalds0n

I got my digital gauges from Nordskog but they look a lot like Cyberdyne. I was able to order them in Amber which I think is a softer color and more fitting with the dash lights.

Also, there should be a separate power feed you hook up to the lights (I think I pulled from the cigarette lighter lamp), so that the gauges dim when the headlights are turned on.

Cameron

Started playing with the SharkTuner on Sunday. My initial feedback is that it is a tool that the 928 performance crowd will love.

We were able to immediately resolve the limp-home mode issue on the GT. The afr was too rich at idle and the SharkTuner enables you to modify the fuel map on a field by field basis (manually or using a feature called Autotune). In my case, by running Autotune at idle, the main fuel map fields that are referenced at idle were modified to yield something much closer to an AFR of 14.7 stoich.

If I chose to make no other changes to the fuel map, I will consider this adventure and the use of the SharkTuner a success by addressing the idle limp-home mode issue in the TS Supercharged GT's.

Jim_H

That makes sense. When I was at Louie's a few weeks back and he was playing with the tuner he had said the factory idle setting was way rich and he had leaned it out some.
Were you doing this solo, Cameron? The Tuner seemed a bit intimidating to me.

mspiegle

I wonder if the factory idle was set that way to keep the cats heated and functioning properly? hmmmm. There are different maps for cars with/without cats, right?

John Speake

Hi Mike,
No, the same mapping is used, cat or non-cat. They are two seperate maps, which opens up the option of having selectable maps while you drive, by a simple switch on the code plug. You would have to run open loop on the non cat map of course, but could be useful for track or road options.

Cameron's car is running closed loop. The problem was that with 30# injectors and the 85/86 FPR, the O2 loop can't quite keep the loop in control and hence the mixture at the required 14.7:1. The ST has allowed him to adjust the mapping so that the O2 loop is well within its control range, instead of being off one end of the range.

Louie was running closed loop as well, I believe, on his stock '87 S4. He was adjusting to get well into the O2 loop range.

Regards

Bill Ball

Should help me too, as I just popped in a RRFPR and I have 30# injectors. Probably rich at idle.

Rick Carter

Idle fuel pressure 37psi with 30 lb injectors, fuel pressure about 50 lbs at WOT, 1985 32v with Eaton M112 6.5 pounds of boost. A/F was about 11.8:1 at WOT.

The chart below shows amount of fuel taken out using the SMT-6

RPM

-2, -2, -2, -2, -2, -1, -1, -5 6010

-2, -2, -2, -2, -2, -1, -1, -5 5634

-2, -2, -2, -2, -2, -1, -1, -3 5279

-2, -2, -2, -2, -2, -1, -1, -3 4903

-2, -2, -2, -2, -2, -1, -1, -2 4542

-2, -2, -2, -2, -2, -1, -1, -1 4170

-2, -3, -3, -3, -2, 0, 0, 0 3805

-3, -3, -3, -3, -2, -1, -1, -1 3437

-3, -3, -3, -3, -2, -1, -1, -1 3068

-3, -3, -3, -3, -2, -1, -1, -1 2706

-2, -3, -3, -3, -2, -1, -1, -1 2334

-2, -2, -2, -2, -2, -1, -1, -1 1970

-2, -2, -2, -2, -2, -1, -1, -1 1601

-2, -2, -2, -2, -2, -2, -2, -2 1235

-2, -2, -2, -2, -2, -2, -2, -2 867

69 73 77 81 86 90 94 98 Percent load deflection







The chart below shows timing taken out or added using the SMT-6, no timing changes above 2706 RPM

RPM

0, 0, -1, -1, -1, -1, -1, -1 2706

0, 0, -1, -1, -1, -1, -1, -1 2334

0, 0, -1, -1, -1, -1, -1, -2 1970

2, 1, 0, 0, 0, 0, 0, 0 1601

4, 3, 3, 3, 0, 0, 0, 0 1235

4, 4, 4, 4, 0, 0, 0, 0 867

69 73 77 81 86 90 94 98 Percent load deflection



There is more fine tuning to do as I get time.

Cameron

John,

Correct. 30# injectors, 85/86 FPR, no other RRFPR, Innovate LC-1 Wideband O2 system, 6.7psi boost pulley (makes a tick over 6 psi boost on the GT). I have the Eaton M112 blower, known as the Jag/Eaton setup that Andy was selling.

James,

The initial installation of the SharkTuner was a bit intimidating due to the fact that you have to be willing to open up the LH. Once you get your head around that, the installation / setup is actually quite simple and straightforward. The provided instructions are very clear. It probably took me 50-60 minutes end to end and I was moving slowly. I am including everything from disconnecting the battery as step one, to firing up the car with the SharkTuner running as the final step. If I was to do it on another car having done one, I could do it in 30-40 minutes easy.

I did the physical installation and setup solo. Sebastian participated in the initial drive testing and autotuning. We had limited time yesterday for drive testing / tuning / playing so we will be at it later this week. I will provide more feedback and opinions then. I will tell you that one of the key steps in autotuning the cruise map is to be very smooth on the driving. I failed that one, I was driving too aggressively so I really needed to restart the process but we ran out of time.

Bottom line is that you shouldn't be intimidated. Easy and straightforward setup so far.

Bill Ball

So, Cameron, you have an eprom burner too?

Cameron

Bill,

Nope. I drove my car to work today with the SharkTuner running. I will drive home that way as well. I am working with John on getting an eprom when complete.

Cameron

Rick,

Your WOT AFR went from about 11.8 to what after your tuning?

Rick Carter

Cameron,
The WOT was tuned to be 11.8:1. I've talked with Louie and he suggests leaving it there above 3000 or 4000 rpm but it can be changed to 12.5:1 at lower WOT rpm. A recent 4 hour freeway drive averaging about 70 mph gave me 21.7 mpg.

Bill Ball

Oh, I see. I thought maybe you had burned a chip already.

mspiegle

Wow, I find your timing setup very strange. I did exactly the opposite. Any reason why you decided to pull back timing in the upper RPMs?