Lizard928

with block off plates like Louie's

Carl Fausett

We are just a little backed up at the moment, but the next project waiting to get into the shop is installing a TecGT system on a 1991 928 GT. If you can wait a little bit, I will be able to locate a sweet spot for you and take pictures of it.

Mongo

I have a while before I get the system. House first, then Electromotive.

Love to see pictures soon though!

Mongo

a big large fake engine cover

Mongo

Hey Carl, with your TecGT kit, will you be including a wiring diagram taylored to installing and splicing the system into some of the wiring already in the 928, i.e ignition?

The diagrams I've been looking at on the Electromotive site's install manual are very universal. Makes sense, but universal.

Mongo

After looking at the book again, TecGT has provisions to use both the crank sensor and the hall sensor at the cam on the 928. Are these both used still in this new setup?

Mongo

hmm... something tells me I'm the only one that actually still looks at this thread now..

BC

Its a big step for people Andy. People look at the current system and feel as though the myriad of tradeoffs you must consign to are acceptable - if you don't need to rewire the whole engine bay. That's a big learning curve. They are also very big tradeoffs as well.

Mongo

It's a big step for me too. Not afraid of it though, more like anxious to accept the challenge

Carl Fausett

[/QUOTE]

We designed our application to use the stock crank reference trigger, because it is an excellent design and located in a good spot. Much better than a crank reference sensor mounted on the nose of the crank.

BTW: it is not a Hall sensor. On a Hall sensor, you wave a magnetic material under it and it pulses. They are usually not powered. On a Mag sensor (what the 928 has) the sensor has the magnet and inductive pickup in it. You only need to wave ferrous metal beneath it. The 928 uses a Mag sensor, not a Hall sensor.

A crank reference sensor mounted as close to the clutch is optimal and better than mounting on the nose of the crank. This is because of the torsional twist in the crankshaft, which can make a crank reference sensor mounted on the nose delayed by as much as 10 degrees on some engines. The load on the crank is at the flywheel, and by mounting the crank reference sensor at the flywheel, they have removed the torsional twist (and the delay and the inaccuracy) from the sensor's measurements.

Yes the factory tach works with the Electromotve TechGT installed. Mine does.

Yes, it will read and respond to a knock sensor, and we are using the stock knock sensor mounted in the stock location.

We finished mounting the Electromotive system on the 1978 engine, and our next step is to mount it on the 1991 928 GT. Our plan is to write an installation supplement tot he Electromotive installation manual that is Porsche 928-specific.

As you can see, we now have the pinouts and wiring specifics to use the stock crank reference sensor and the stock knock sensors and the tach. The stock throttle position switch on the throttle body has to be swapped out for a different TPS, but we supply the switch and have manufactured the adapter plate to mount it up.

Mongo

It's good to hear the tach works with the TecGT still. I have seen some applications (such as TecGT on Ferrari 308s) where people have used an aftermarket tach adapter (usually made by MSDS Ignition) to correct the signal. How convenient and easier this will be.

I'm glad that the hall sensor on the passenger camshaft will not be used in this application for S4's, GT's and GTS'.

dprantl

It won't? I didn't see Carl saying that... ?

Dan
'91 928GT S/C 475hp/460lb.ft

Ben Allison

The TecGT unit won't do 8 cylinder sequential injection, therefore there is no need for the cam sync sensor. If you want 8 cylinder sequential injection, you'll need the Tec3r system.

Mongo

Yup - hence why Carl went with the simpler TecGT for street applications.

dprantl

So... the TecGT is unable to retard ignition for a specific knocking cylinder then?

Dan
'91 928GT S/C 475hp/460lb.ft