Lizard928

Fair point on that Z about using other things to tweak the car without the shark tuner.

I never think about those things as I would never use anything like that.

Warren928

Hacker,

I did not mean to make the process of tuning too simplistic. I understand that there are many hours needed of testing, analyzing data and making corrections to get the tuning right.

And its possible that using sharktuner's software is not as easy as using a late model tuning software made for newer engines. The brains are obviously not as advanced as todays EFI brains.

Is there a really well done write-up on the various steps to sharktuning a supercharged engine? A general DIY manual on the subject that explains all the details?

EDIT: I did find one link:
http://www.jdsporsche.com/faqs/PEM%2...0Issue%201.pdf

I am sure people would be interested in how the baseline calculations are figured, how the initial inputs are entered, and how the continuous process works until its completion.

Guys who go the MS route are definately going to also be a great help to all 928r's if they can share alittle knowledge about the process.

John Speake

There is also more information here
http://www.jdsporsche.com/faqs/User%...0EZK%20211.pdf

and here

http://www.jdsporsche.com/faqs/LH2.2...Issue%202b.pdf

Have you read all three ?

Warren928

Not yet, thanks for the links John.

What is the latest news and products on Sharktuner(s) for the 86.5 US engine, as far as cost and these instructions go? Something was mentioned about a $500 after conversion, but I wanted to make sure what you were talking about.

hacker-pschorr

I have everything I need to convert one of my cars to 85 EruoS LH / EZF. I'm going to try and MS my replica Cobra before spring. Assuming that goes good (Z is on board to help, I think) I might just MS the two 928's instead. I would like to keep those two cars on the same system. Sourcing all the parts for a second LH / EZF will most likely cost more than a 2nd MS.

Seeing these MS threads is getting me motivated. I'm taking the "easy" route since DIYTune sells a PnP box for the 302 in my Cobra.

Lizard928

They should change your name to "slacker"

Knowning both systems I would recommend the MS over the LH2.2

John Speake

AT present, the only option for '85/86 cars is an upgrade to the existing SharkTuner. Prices are now lower due to exchange rate movements.

The Mk2 St will initially be for PEM equipped 87-95 cars. If sufficient demand we will develop PEMs for the earlier cars as well.

Didn't mean to hijack the Megasquirt thread - sorry.....

wildwestsydney

I finished my IAC vavle. It is working great on the bench. This is a direct bolt in replacement for the bimetal OEM unit, it will also use the stock hoses. My stepper IAC will let me set any amount of air bypass based on coolant temp. A picture is below.

tydriver

I assume you make use of the knowledge over on the various MSEFI forums. I found this thread of interest, although if you go with 36-1 it may not apply :
http://www.microsquirt.com/viewtopic...orsche#p147305

I'm in the midst of MSing a motorcycle.

hacker-pschorr

Thanks for the link - I've been wondering if MS would work with a 100 thooth flywheel.

Haha, look what I found

http://www.microsquirt.com/viewtopic...21554&p=136740

T_MaX

A few questions to the 928 pioneer’s who are using the MS systems.

Who bought their units pre-built and who bought and soldered it up from kit form?

What is the difference between the stock IAC and the one being used with the MS system?

Could the stepper IAC be used in a stock 928 without use of the MS system?

Cheers, T_MaX
Porsche Car Underground

Lizard928

I have done both, soldering it up takes about 8 hours the first time if you are good with soldering.

Which year are we talking about here?
from 78-84 they are completely different, not even close to the same.
from 85+ from what I can find they are completely different.
Could MS run them, yes it probably could, it is open source after all, but you may have to modify the internals for it.

No, not without some form of aftermarket computer to control it.

T_MaX

So I'm guessing that Porsche used two diferent IAC valves. I'm asking because I don't have my PET loaded.

Lizard928

1978-1984 are what is known as an AAV (auxilary air valve) it is more a mechanical valve that has a bi-metallic strip which is heated by both the engine and a power source. When heated to stops extra air.

1985+ are stepper motors (1985/86 are slightly different I believe from 87+). These are completely electrically controlled with 3 wires.

T_MaX

Very good info thanks!

I have a 89 and from purchase, I could not figure out why they stuck it under the intake (of all places)!