Pro Stock John

iTrader: (34)

Thanks Zach, now I feel better. You should be a motivational coach.

Not much more to say at this point. Block is tired or broke, turbo is broke. Formula > PSJ.

NA$TY-TA

iTrader: (21)

U still going to Memphis if the car isnt up John??

Pro Stock John

iTrader: (34)

Yeah Kyle, see you there.

I have some pics to post, some of the internal cast iron structure of the turbo is broken.

Pro Stock John

iTrader: (34)

Pics:

Pro Stock John

iTrader: (34)

DrTurbo

iTrader: (3)

Have you talked to Jose about it yet? Might want to send him the pics.......something doesn't look right. I'll let him make the final call though.

Pro Stock John

iTrader: (34)

PM me his number.

DrTurbo

iTrader: (3)

Just call our main #. 256-796-1230

Pro Stock John

iTrader: (34)

We talked and he said it's the older design, and they are known for having the stub shafts break. Given the damage, and the $1000 cost for a new cartridge, I don't plan to fix it out of my pocket.

lt170chevelle

iTrader: (2)

dont forget also that if the oil pressure is high enough that it will bypass the filter and could let contanimates through and into the turbo...just a thought

Pro Stock John

iTrader: (34)

True, like if I had broken something and material went through the engine, it could wreak havoc on the turbo. I know of someone who lost a few turbos that way one weekend.

In the end it looks like the issue is the turbo not taking the power. Thanks guys.

tomz28

iTrader: (20)

wow that sucks john i hope it works out

Pro Stock John

iTrader: (34)

Well it makes sense, everytime I tried to run big boost I broke it, both times.

Oh well life moves on, I have an LSX block here and 6 bolt TFS heads. I'm waiting on some rule clarifications from a local racing series, and then I will make my move. If they allow twins I'll do that, if they only allow a single I'll focus on that.

I guess the lesson learned is watch out, there are a lot of gt47-88's out there and some are for 800hp and some are for 1200. looks like i was trying to make 900rwhp or more with the 800hp one.

I'll start a new thread when I decide what I'm doing.

Pro Stock John

iTrader: (34)

Was talking to one of the PTE guys for a while, he felt that the turbo croaked from being over spun and that the backpressure might have been way too high. Given that I was only running a 348ci, I'd say those guys running GT47-88's with 348-408ci setups might want to call over there and see what they say regarding backpressure. Seemed to be saying that I would have been okay with smaller cubes but heck that's like running a darn 5.3 truck motor.

DrTurbo

iTrader: (3)

348 and a 92mm UHP turbine does not have unreasonable backpressure problems, not at 800rwhp. Heck the small turbine units we build for alot of the V8 guys don't break like that.

Pro Stock John

iTrader: (34)

I'm not following you, can you add more comments.

veee8

iTrader: (40)

Not sure if you answered before, but is yours a T4 or T6?

Pro Stock John

iTrader: (34)

T6. Check your part number and make sure you can push that one hard.

stevieturbo

So have you removed the turbine shaft ??

Has it seized ?? Are there signs of lack of oil ??


Or has the shaft simply broken at the compressor wheel ?

DrTurbo

iTrader: (3)

Easy way to know.......

If you can see the shaft through the top of the compressor wheel your fine. If not, then your running a stub shaft.