3T GTE Tech

[Cuts]

Im currently using a twin entry turbo on a single entry housing (with the exhaust housing die ground out a bit, but the manifold not ground) and performance is poor, massive bottle neck. Its only for a couple more days till i finish the twin entry steam pipe manifold im making now.

[YelloRolla]

I trust that you are making the manifold with 1&4 grouped and 2&3 grouped.
Do you have programmable management?

[Cuts]

yes i am and no i dont.

EDIT: observe.





Its now fully welded up, a bit of die grinding on the head ports, and a machine of the faces and its done.

[YelloRolla]

Looks good - did you use 1-1/4" steam pipe or 1"?

[Cuts]

1", was going to go 1-1/4", but its only a daily and so smaller diameter, keep gas velocity up.

[YelloRolla]

this is good!!!

[3jcelica]

With the australia/USA dollar the way it is I am looking at buying some pistons.

The wiseco pistons have a 2cc valve relief, and I have calculated an approximate static compression ratio of 8:1,

BRD also do custom pistons, so I am wondering whether a custom piston with a flat top (no valve relief) is worth the trouble. I calculate a flat top would result in approximately 8.2:1 static compression ratio at 87mm bore. Is this worth it? and does the 3tgteu need a valve relief (never had my head off) ?

Thanks

Roger

[YelloRolla]

I have used about 12 sets of the Wiseco piston - the ~8:1 comp ratio is up on what the factory spec of 7.8:1.
I have a set of pistons (2nd hand) SPS that are 86mm with the 6cc dome on them, c/w pins and rings for sale if you're interested. These use the RB30ET turbo rings.

[turbotoy]

Depending on bore don't the flat top pistons give about 7:1 CR?
The factory pistons have a dome and they are 7.8:1 CR. I also had my 3tg head cc'd and it was 65cc combustion chamber volume. It has been milled a couple of times so yous might be different. I personal recommend the valve relief. When I checked mine the exhaust relief gave us an almost non-interference fit. The intake does interfere but has plenty of room. From what I understand the turbo 3tc pistons are very close but I have never personally clearanced them. May be a cheap alternative.

[7t5-27]

I try to do as much research as I can before buying parts and after talking with the folks at BRD and other places here stateside i ended up with Arias 87mm pistons with the 8.8 compression ratio for the 3tc. I was told they would work with the 2tg head with no problems, As I am still collecting parts I have yet to start building the motor but once I get around to it the piston to valve clearance will be checked and double checked. The crank is 3t and the rods are eagles, time will tell if it fits/works or not. Be safe
Greg

[steeko]

i have my ta63 on the way to me now.

Some questions as I haven't played with these cars for a few years.

I am looking at a SA63 celica donor car for replacement panels.
Can the aircon bits fit to my 3tgte? The SA63 has a 2S-C motor, manual, needs battery.

Should I salvage any other spare parts that I may need that will suit the 3TGTE?

btw i have also ordered new head bolts from Performance Wholesale as I'm doing the head gasket.

Also interested in what's involved to put the bigger turbo (CT26b or something?)on it but I'll hold off on that until i get the car. This will be my first turbo car so am still green to it all.
Approx how much does the bigger turbo cost? Do you have to run an intercooler with bigger turbo?

thanks in advance

[Diz44zy]

Hi all

I have a quick question in relation to pistons. I am looking purchasing some forged Arias and would like to know whether high or low compression pistons would better suit my 3tgte. My understanding is that low compression pistons are better for forced induction (can run more boost without the risk of detonation) and high for naturally aspirated. Any help would be much appreciated.

Cheers

[fade-e]

i believe that to determine which type to get is dependant on the amount of boost you want to run

for example,

if you run 9-12psi, then the relatively high comp pistons will be fine, but if you run 20+psi then you will need to look at low comp pistons

if you search the forums or google, you will find a number of engine type programs that should be able to help you out...

cheers

[YelloRolla]

To grossly simplify it, it is going to depend on cam choice, boost pressure and fuel type (combustion chamber efficiency will largely limit what you can achieve and since your most likely not changing that then there is not much point in harping on it).

Cam timing influences the dynamic compression ratio, if you reduce the dynamic compression ratio by longer duration cams, then you will need to increase your static compression ratio, or wind up the boost (or both).

Given that you are modifying a stock engine, I would stick with pistons that keep your static around where the factory has it, (that way you won't be getting too far off track, assuming that you use stock cams) at 7.8:1. I use the 87mm Wiseco flat tops to come back close to that figure.

[Javal]

Hi all

I have a quick question in relation to pistons. I am looking purchasing some forged Arias and would like to know whether high or low compression pistons would better suit my 3tgte. My understanding is that low compression pistons are better for forced induction (can run more boost without the risk of detonation) and high for naturally aspirated. Any help would be much appreciated.

Cheers

Sorry champ, but if you have to ask these kinds of questions, you shouldn't be the one ordering your pistons.