Hello Ken
Thanks for the pictures. It looks as though the board design was gradually upgraded and changed through the three US 85/86 versions from /3 to /04 to the final /05 interation.

They are all functionally the same.

The Euro boards do have many holes where components aren't fitted - O2 loop and ISV loop.

 

John:

I have just a general question for the 85/86 Model year.

At some point in the future I'll be able to rent or go in on a purchase for one of your tuners.

My question is what effect will the low octane loop plug have if plugged together after the tune. Right now when I am doing track events, I plug the loop together in order to pull a little timing out of the equation. I also went back to the stock chips over the Auto Authority just to be safe.

Will the loop still function in the same manner? It would be interesting to have a spot on profile built and then be able to add some safety margin for those high ambient heat days and 40 minute run groups by simply going to the low octane loop.

Thanks for your hard work and development.

Ken

 

The EZ-F octane loop shorts the (airbox) air temperature sensor input to ground, which causes the EZ-F to retard by 3° at full load. Unplugging the air temp sensor does the same thing.

It would be nice if the 3° were adjustable.

I'd like to know what the octane loop on the LH does, if anything.

 

Hello Ken + PoKen,
At present the EZ-F SharkTuner will retain the standard 3 deg retard.

Not sure if it can be reprogrammed. There is bugger all code space left.

How would you use such an adjustable retard for PorKen ? I assume for knock related retard ?

The EZ-F SharkTuner has made excellent progress in the last few weeks, perhaps I should re-name this thread...

We have found a larger than expected variation in the MAP sensors in a sample of EZ-F units which of course affect the igntion timing. At least the ST will sort out those issues. We have a calibration feature which resets the zero vacuum figure and also allows for altitude when making that correction.

 

[QUOTE=John Speake]Hello Ken + PoKen,
At present the EZ-F SharkTuner will retain the standard 3 deg retard.

Not sure if it can be reprogrammed. There is bugger all code space left.

How would you use such an adjustable retard for PorKen ? I assume for knock related retard ?

The EZ-F SharkTuner has made excellent progress in the last few weeks, perhaps I should re-name this thread...

We have found a larger than expected variation in the MAP sensors in a sample of EZ-F units which of course affect the igntion timing. At least the ST will sort out those issues. We have a calibration feature which resets the zero vacuum figure and also allows for altitude when making that correction.[/QUOTE]

Also boost?

 

John,

I should have said 'programmable' bad sensor/octane loop retard. Possibly knock sensor retard, but I might also need it for a future variable valve timing system.

You missed my query, above, about the octane loop wire for the LH2.2, pin #19. Does it do anything?

The MAP sensor trim is a cool feature.

 

Hi PorKen
Sorry I missed your LH2.2 octane query (pin 19). We haven't investigated how that bit works yet. I suppose I assumed that with better fuel quality no-one uses that octane loop in the USA now ?

I had better set up a LH2.2 and ground pin 19....to see what it does.

On the question of changing the amount of retard on the EZ-F when the octane loop is enabled from 3 degrees - the Air temp sensor compensation map is available in the EZ-F SharkTuner, so you can just go in there and change the number of degrees retard you require :-)

We would have to find a relaible after market knock sensing system to use with this. I have bought a KnockLite but fitting this to a stock Euro S2 is going to need some effort on my part.


Hello Rick,
The standard MAP sensor doesn't register any useful manifold pressure readings when under boost. To achieve that would require the use of a more suitable MAP sensor, and then interface it to the
EZ-F. The main cruise map would then need some modification to work with this option.

But it could be possible......

 

John,
I was holding on to the slim thread that vaccuum input could also serve as positive pressure input.
Thanks,

 

Can you advance too?

Right now, as I understand it, the TempI map use is not used very much, over 50°C, infinite, or open, there is a 3° retard. For that matter, the TempII map is pretty basic, too, over ??°, there is also a 3° retard, when the engine is warm.

If there was a need, you could set the desired additional retard (/advance) at specific values, using fixed value resistors as the input?

 

The Standard MAP sensor won't indicate boost, but an aftermarket one could possibly be integrated into the EZ-F

 

As it is at present, the air temp sensor map will only go retard (up to 29deg)

Yes, temp 2 maps are basic , but can also be modified.

For temp 1 there are two maps, high load cruise and WOT

For temp 2 there are 3 maps, idle, cruise and WOT

 

I have a question. I have looked into the pin 19 octane loop issue.

As far as I can see, the input goes to a transitor driver, but there is a resistor ommitted from the circuit board so the link would not switch anything.

On my Euro S2, there is only the octane loop for the EZ-F. Do the US 32v cars have both loops, including the LH one ?

 

John, the US 85/86 32V cars, have a bypass for both LH and EZF yes

 

OK thanks for that information. Of course I have never seen a US 32v car......and the Euro version of the early 32v is very rare in Europe.

I will investigate the pin 19 circuits more tommorrow. I just need some time...

 

This is what I think I traced from pin 19 on a 04 board...YMMV!