NewToPig

Hey all,

Hans passed along an original first gen Sharktuner for use on my S2. His recollection of the exact usage is from sometime ago so I reach out to John Speake who said I was missing a break out board and intercepter cables (wiring harness in and out). From looking the guts, I suspect this only reads and emulates the eprom and does not read sensor data. If anyone remembers the good old days and can point me to a basic use scenario that would be super helpful.

jcorenman

What parts did Hans pass along, besides the box itself? You are correct, that the original "Sharktuner-Classic" (for '85-86 cars) is connected to LH2.2 or EZF (one at a time) via a ribbon cable and adapter. Some sensor data is available via the break-out box which connects the harness and ECU. I've inherited the Sharktuner project from John, and provide sales and support for Sharktuner Mk2 (ST-2) but can provide only limited support for the original Sharktuner. The new website is Sharktuner.com. I am slowly adding support info, but that is pretty much all ST2 at this point.

You want to start with the manual for the original ST, which I just uploaded to the website-- click on "Downloads" in the menu bar and scroll down to "Downloads for original Sharktuner (’85-86)", the manual is just below that. There are photos in there for all of the parts that you should have. I would contact Hans and see if he has any of the missing bits. I also have some limited spares for the ST-1, there is a contact email on the website, or PM me here.

My experience with 928s is deep but narrow, with only the 87+ S4/GT/GTS models. So the best source for "how the heck does this work" for the original Sharktuner-one will be the manual and the folks here who have actually used it.

And the other option of course, which some folks here have done, is to swap '87+ ECUs and harness and use ST-2. Connection is much simpler-- via the diagnostics connector-- and you pick up knock sensors which really helps with ignition timing. But the boxes and harness parts aren't cheap.

Cheers, Jim

NewToPig

Jim,

You are a god send. I had been to the website before so thanks for throwing some older info up on it. These are the other connectors that were sent but John said some go to 87+ cars. Because it is an S2, I'd rather not swap the harness or anything else permanent. Because there is no O2 feedback and just the MAF signal, I want to just check the car once a year so to speak and tweak AF is needed and or be able to see the MAF has clearly lost its mind.

NewToPig

Jim was there a version before the AUX board version? Like a 0.9 to the 1.0. There is no provision for the break out. My total connections are:
Front DB9
Rear PS2
Rear ribbon cable
Rear 1/8" Stereo plug

jcorenman

Yours doesn't have the 12-pin "Aux" connector shown in the manual (not there on the PC board photo), so it must be an earlier version. Unfortunately, I don't have any info on that. The earliest manual I have shows a "New" Aux connector for a break-out box. What is confusing is that your photos show the 12-pin Aux cable connector (empty), but no place to plug it in. That same connector is also used on ST-2 for Aux inputs, so it may have gotten into the wrong box.

The front DB9 is a serial connection to the computer (you can use a USB/serial adaptor);
If "PS2" means 9-pin mini-DIN connector, then that is the power connector for the ST box-- which can also connect to the diagnostic plug on an '87+ 928 (and the cable shown is for '87-88).
The ribbon cable connects to the EPROM socket;
And the 1/8" stereo plug connects to the WBO2 controller (plug-in for the Innovate LM1, adapter needed for others). That rubber 3-pin connector is for getting power from the NBO2 harness connector.

I believe the additional "aux" inputs for ST1 are for display and diagnostics, and that the signals required for the fuel and ignition maps-- engine load and RPM-- are pulled via the ribbon cable. That would be enough to check and correct AFR, but you would still need a Wideband O2 sensor to know what the AFR is doing. The simplest/cheapest might be the Innovate LC2 (ballpark $180 with sensor).

Jim


To make use of it, even for simple AFR checks and possible tweaks, you would need either a factory NBO2 sensor or a Wideband O2 sensor/controller-- otherwise

NewToPig

Thanks Jim, for the run down on connections! I believe Hans included some other parts just from his collection which threw me off a little because like you said there is no AUX. What does the 14-pin style connector do?

For AFR, its a catless S2 so there are no factory connectors, but I can pull power out of the fuse box. I already have a LC2 installed and powered. I have tuned in Megasquirt since the original group buy in 2001 as well as tuned drag cars by edit in HEX . So I think I can get a handle on Sharktuner once I am able to fire it up with the connections.

I just got a new DB9 to USB so I will try to get it working this weekend. Thanks so much!

hacker-pschorr

Here's everything you need. In addition to the ST1, breakout box and associated cables. You also need a chip burner, chip eraser, and some chips.

With the ST1 you can only tune one ECU at a time. Save that file, burn the chip, install in the ECU, then connect the ST to the other ECU and tune that one.
I always wanted to try tuning both at once with a pair of ST1's, but never had the chance.

The USB to Serial adapters can be troublesome, reason why I have a specific laptop with a serial port just for the ST1.

NewToPig

Thanks so much Hacker, it helps to see it all laid out. I suppose the larger issue is this is a preST1 or at least what Jim, John, JDS refers to as a ST1. There is no provision for the Aux break out board so you cannot pass through on the ECU connectors. I guess the most I can do is get it hooked up and see if I can at least see AFR vs RPM/Load/MAF coming from eprom socket. That will allow rudimentary tuning at least. I used to have that same Pocket Programmer. Did a lot of chips on it. I will have to see if its still made.