3T GTE Tech

[RAAAH23]

Here are some photos of the setup. One day I'll get around to milling up a nice shiny cover plate with the TEQ logo on top.





To save a bit of money it was easier to mill the 2TG shaft without the fixing hole and just use a clamp. I found the Holden 253-308ci clamp to be pretty close to what was necessary. I did have to put it in a vice and just ever so slightly put a slight angle on the two forks.



http://www.speedproshop.com.au/index...mart&Itemid=93

[RAAAH23]

Didn't realise 2TG and 3TG had different distributor positions. So take what you need from the information above.

Does the 3TG distributor get its drive from the upper timing chain?

[TA22 GT]

The 3TGTE dizzy drives direct from a gear on the cam.

[RAAAH23]

Ok a few questions. Do 3TG blocks have a hole to mount the distributor off the oil pump shaft like 2TC/2TG/3TC motors are?

Would there be a benefit of running it this way?

I was told the closer to the crank shaft a distributor/CAS is the less chance there is of timing chain slop/slack retarding the ignition with wear.

[73GTV]

Ok a few questions. Do 3TG blocks have a hole to mount the distributor off the oil pump shaft like 2TC/2TG/3TC motors are?

Would there be a benefit of running it this way?

I was told the closer to the crank shaft a distributor/CAS is the less chance there is of timing chain slop/slack retarding the ignition with wear.

Yes, you can install a normal distributor to the 3TG block, I was looking for the modification for the 3TG distributor, Thank you for the look at your RX-7 Crank angle sensor.

[TA22 GT]

Ok a few questions. Do 3TG blocks have a hole to mount the distributor off the oil pump shaft like 2TC/2TG/3TC motors are?

Would there be a benefit of running it this way?

I was told the closer to the crank shaft a distributor/CAS is the less chance there is of timing chain slop/slack retarding the ignition with wear.

Yes, that hole is there but plugged off on the 3TG. Personally i think running from the cams is better. Firstly it allows a TDC position and second it runs at half the speed of the crank and its less likely to have vibration issues. Being chain driven i doubt it will move much at all. if you use the crank you need to have another sensor on the cam anyway if you want sequential injection....

At the end of the day, both work and its best to go with what youre most happy with

[NME308]

Now to clarify up front I am playing 3TC not twin cam - but - shorter chain drive to start with.
The effort to mount a crank trigger PLUS a cam sync is well worth the exercise in my opinion!
Using cam trigger only my timing used to flicker around say 3 to 5 degrees on the balancer. Now using crank & cam it is rock solid. It probably only matters if you plan to live on the edge but that's where I spend my time so I was seeking the most accuracy.

Cheers,
Jason

[WDE_BDY]

The 3T-GTE still has a dummy dizzy fitted to drive the oil pump like a standard T series, manifold/head clearance is the biggest issue.

Callum

[TA22 GT]

Yeah, you could use a modified dizzy and run from the dummy drive on the 3TGTE. It does have a shorter chain but as you say it would depend on having enough space...

This would be easier if using a 2TG head on 3TGTE bottom end. Otherwise a fair section of the 3TGTE mount for the dizzy would have to be cut away to make room to get into the hole to the dummy drive..

[AE25]

agree with NME308, anyone that hasn't adjusted their chain tensioner properly will know that the chain hits the cam cover. then there's guide/sprocket/chain wear that will move base timing over time. The stock dizzy position (off intake cam) will never be as accurate than direct off the crank.
Can still run wastespark ignition with a crank trigger and missing tooth trigger wheel.
yep need to chop away some of the 3tg dizzy mount to fit a 2tg dizzy into the block. (and tweak the 3tgt turbo oil feed line slightly).

[73GTV]

So, again nothing in print! Hybrid engine modification suggested (I like that upgrade using the RX7 CAS) and Crank trigger with duel sensors suggested. Thank you for the input. I've been working and building 2TG and 18RG since 1983 so it is time that I updated the ignition setups.

This will be the actual first go round with the 3TG, but I have collected plenty of spare parts to make it a good go of it. But I still want to check with someone who has modified the original distributor.

[TA22 GT]

But I still want to check with someone who has modified the original distributor.

The mod I did uses the stock 3TGTE dizzy base with it grafted onto a 4AGE dizzy which inside has a 24tooth wheel and TDC reference like te Mazda set up. Full details and pics on my page if youre interested.

[73GTV]

The mod I did uses the stock 3TGTE dizzy base with it grafted onto a 4AGE dizzy which inside has a 24tooth wheel and TDC reference like te Mazda set up. Full details and pics on my page if youre interested.

Thanks, I just saw the pictures of your setup. I'll head to the bone yard to see if there are any parts I can use to fabricate a setup, we have a imports only yard so sourcing parts are a small effort on my part. Even though the 4AG's are drying up here in SoCal. MR2 seems to be the only car left with them still installed in the car, AE86's get swarmed as soon as they arrive so slim picking on that end.

Thanks for the update and input. Oh cool, my parts from Australia just arrived. Two each, 3TG full gasket kits.

[TA22 GT]

73GTV,
Yeah, see what you can find, there are lots of ways of doing this mod. You could run a 24 tooth and trigger wheel ike I did or you could run a toothed wheel on your crank and then a single trigger from a dizzy to locate TDC. A late model 2TG dizzy should have this trigger and I think it would be a direct fit in a 3TGTE besides having to cut away from of the mount on the head to make room for it. Maybe someone else can confirm this?
A spoke with Microtech a while ago when I was looking at options and they mentioned that virbration is sometimes a problem when mounted to the crank and recommended running off the cam, which is the way I went.

[73GTV]

73GTV,
Yeah, see what you can find, there are lots of ways of doing this mod. You could run a 24 tooth and trigger wheel ike I did or you could run a toothed wheel on your crank and then a single trigger from a dizzy to locate TDC. A late model 2TG dizzy should have this trigger and I think it would be a direct fit in a 3TGTE besides having to cut away from of the mount on the head to make room for it. Maybe someone else can confirm this?
A spoke with Microtech a while ago when I was looking at options and they mentioned that virbration is sometimes a problem when mounted to the crank and recommended running off the cam, which is the way I went.

You make a good point and i am looking at following your advice. Hopefully will have sometime off next week to follow up on this.
I was just looking through my old Carboy magazines from the early 80's which features the 3TG and compares the difference between the 2TG and the 3TG.


Again Thanks