Maxt

I have a 46 mm now, I need a 60mm.

j9fd3s

thats a big trombone!

1Revvin7

I think you just need to start with a base of 20



60mms are spendy...

Maxt

Yeah, I had it up to 25 psi with the haltech last year, the problem with it, is its just not predictable though for any kind of safety margin with my injector duty cycle.

I like to start at 8-10 psi base boost, then sit on the dyno and just go one click at a time on the boost controller through the map, it limits the amount of cells you have to pay attention to and manipulate all at once. Right now its travelling different diagonal paths through the map in each gear, which even with map trace, makes it a messy process.

I know 60's are spendy, but if it makes the car work, it has to be done.

TYSON

add a second wastegate.



WHat did you have to replace in the tranny when you took it apart?

Maxt

yeah thought about that, but then any guarantee the 2 springs will be the same?, More lines, etc etc. I think a nice big 60 is the answer. I am actually thinking about installing my T51 kai on the HKS vband manifold with a 60mm gate, and retiring the T51s with its T4 setup.

The transmission actually had nothing broken in it, the 5th and 6th gear got pressed together after a set of jam nuts came loose. It was basically stuck in 2 gears. I was told it had to be overhauled every 5000 km by HKS, but after I saw inside of it ,I don't think thats the case. The thing is built like a brick **** house on the inside, and the transmission mechanic called the innards "f'ing exquisite". The gear that had the most wear was reverse strangely enough.

TYSON

they don't have to be the same, you might have to buy a 7psi spring just to get the boost to stay at 9 sometimes anyhow. Your boost controller will just target a certain boost, it doesn't matter if one gate is flowing a little more than the other.



Maybe they didn't harden the reverse gear. Did you tell your tranny guy how much it cost? lol

Maxt

I could see that being a bit of hassle with getting stable boost, plus running one off each runner, If you had one gate opening before the other, it would do weird things to the flow in the turbine as exhaust tried to bleed back down a port to the opening point. Bleeding through one gate from the merge point reduces a lot of variables. Its best to stay away from systems that don't guarantee the same VE between rotors. Unless I did a wye pipe of my existing branch, but then space becomes an issue..

I think I am sold on the HKS GTII gate, its 60 mm, and its adjustable crack pressure, with a T51K manifold, about 1900.00 for the two.

The reverse gear was heat treated, it's probably because its always a low speed shift into that gear, the more speed the gear sets have, the cleaner the shift is.

I didn't tell him how much it was worth until he had it all apart, he was ok with it, he just seem to have the parts organized a little better after that.

j9fd3s

adjustable crack pressure!



um having taken apart a bunch of stock transmissions, reverse is always beat, especially in the pre 87? boxes, they have no synchro on reverse

Maxt

Thats the holy grail right there.