The 2H/12H-T/1HZ/1HD-T/1HD-FT Gturbo Alternative Tech Thread (5 Viewers)

[Dougal]

Bearing failure, I guess. Possible due to too much boost down low? (20-25psi before 2k rpm) Maybe early but hard to see. Shaft broke and bearing housing snapped. Hard to tell these days if it wasn't a chinese replica.
Was effeminately spooling faster than the Gturbo but cant compare very well because did the pump, injectors and turbo in one go.

Do you have any photos of the broken turbine shaft? They'd tell a lot. Including whether the turbo was a genuine/reputable or cheap copy.

 

[troopie]

Not a lot informative to add, but here are a couple of pictures of my finished and ready to install Forealboreal hybrid CT26.

 

[ForealBoreal]

Hope she works well for you!

 

[troopie]

Hope so too. It'll be six to eight weeks before the 45 is driveable i guess. I'll update this thread when the time comes.

 

[ForealBoreal]

What boost are you planning on running?

 

[troopie]

15 psi without intercooler. After i fit one i'm planning to run up to 18 or maybe 20.

 

[remy]

Looks very nice Troopie. Did you use the ct20 or ct26 with 58020 housing?

For Dougal some pictures of the ct20 shaft. Would be nice to find a 16G wheel with smaller bore to fit the shaft of the ct20.

 

[Dougal]

Wow, thanks for sharing those photos. With the blades plastic enough to bend over like that I'm suspecting extremely high EGT. Did you check A/F or have a particularly short (even post turbo) EGT probe?

 

[gerg]

Yeah serously. It looks like melted chocolate. That shaft saw some serous heat with discolouration like that.

 

[serenity]

A little bit of progress here too, got my chra back rebuilt and balanced with the mamba comp wheel. Just waiting on the turbine housing to arrive then I can start to fit it up. Have yet to decide on waste gate actuators/boost controllers, do I go stock actuator with a separate controller or buy one of the adjustable mamba/kinugawa actuators?

Ok so since this thread is about finding a value for money alternative to Gturbo I'll list my costs so far: All costs are in AUD, 2nd hand Supra turbo $300, mamba wheel $130, rebuild and balance $420, turbine housing $125. If I hadn't damaged my comp wheel it would have saved me $550, however the mamba wheel may be a better performer anyway. Total cost so far is $975 but I still need to sort out the boost controller.

The smaller diameter hub makes for a significant increase in blade width, about 3mm over stock.

 

[remy]

Nice, you could swap the turbine housing for a 58010 of 58020 with smaller A/R for faster spool.

I've a EGT probe pre turbo, never seen it above 600+ degrees but it is just what the sensor reads. Just a puff of black smoke until the turbo spools. Didn't had have the change to hook up the logger for measuring a/f
The previous turbo (Grunter) has seen a lot higher temps and smoke.

 

[serenity]

Nice, you could swap the turbine housing for a 58010 of 58020 with smaller A/R for faster spool.

Yeah I have a new 58020 on its way as I don't want to separate my current turbo, I just had it resting in the supra one to take photos.

 

[ForealBoreal]

Whoa, that chocolate turbo was a grunter?!?
Better contact Graeme, he was offering a huge discount to people tmwho helped him get started

 

[troopie]

@remy i used a ct26 with the 58020 housing.

I had an early grunter too that failed. Have been in contact with Graeme about it, but i never got a replacement that's why i got the package Forealboreal offered.

 

[ForealBoreal]

What did g have to say out of curiosity?

 

[troopie]

He offered me a replacement for a very very nice discount. At that time i wasn't sure if i was keeping the 12ht or start building a 1hd (f)t. I asked him some time to make up my mind. When i got my act together i emailed him again, but got no replies after that.
Since i'm not the kind of guy to post sh#t all over the web and Facebook i decided to go with your diy package.

 

[remy]

No it wasn't the grunter. The grunter failed first (Shaft is in the picture as well), needed my car back running so I put on a CT20B with supra comp housing. That's the one with the melted parts. Didn't contact greame about the turbo yet.

 

[mudgudgeon]

Ok so since this thread is about finding a value for money alternative to Gturbo I'll list my costs so far: All costs are in AUD, 2nd hand Supra turbo $300, mamba wheel $130, rebuild and balance $420, turbine housing $125. If I hadn't damaged my comp wheel it would have saved me $550, however the mamba wheel may be a better performer anyway. Total cost so far is $975 but I still need to sort out the boost controller.

That puts your outlay almost in the new Mamba price range.

any idea if they removed any material to balance it? Or was it good to go? I'm assuming you had the assembly balanced, not just the comp wheel?

I bought a kinugawa waste gate. It looks well made an will fit up without having to modify the link rod or the mounting bracket on a standard one.

 

[serenity]

That puts your outlay almost in the new Mamba price range.

any idea if they removed any material to balance it? Or was it good to go? I'm assuming you had the assembly balanced, not just the comp wheel?

I bought a kinugawa waste gate. It looks well made an will fit up without having to modify the link rod or the mounting bracket on a standard one.

Yeah if hadn't bent a blade on the genuine comp wheel and if I used my existing turbine housing I could have done it for $300. I made a mistake though and paid for it, at least now I know I have a fresh rebuilt turbo that's ready to go.

The mamba wheel came balanced, had minimal material removed from it. I had the whole assembly balanced as well, not sure how much it took to balance.

I've been looking at the turbotech boost controller, I may go that as it's a 3rd of the price of a new actuator.

 

[mudgudgeon]

Yeah, I guess we roll the dice doing stuff on the cheap. doesn't always come off cleanly.
Still a good low cost result.