Polished or un-polished turbo?

[L18M]

can you not take ur new tubby apart n mate it with ur current stock tubby to make a hybrid?
i have no idea about tubbys so nt sure if thats possible

[m1tch]

Hmm well I already have a T4 manifold to fit the larger hot side, I mean the reason why I got it is cause the hot side was large so that I could upgrade the compressor and keep the larger hotside I will have 2 check, I guess it might work as I would have the same exhaust as the OEM turbo hot side would still be used, hmmm

[meddy]

Great Wish I never bought it now

Dont worry about it. Its the route Im going, as I dont think you can justify the cost of the Garrett performance car units. I dont know about garrett housings, but Holset ones (which I plan to use) are peanuts, so if/when it cracks I\'ll chuck on another.

[L18M]

Dont worry about it. Its the route Im going, as I dont think you can justify the cost of the Garrett performance car units. I dont know about garrett housings, but Holset ones (which I plan to use) are peanuts, so if/when it cracks I\'ll chuck on another.

are you not worried if it cracks n some fragments go through the ic and end up in the rotor. could do more damage than you think..?!
plus will mess up not only the housing but the compressor also..

[m1tch]

are you not worried if it cracks n some fragments go through the ic and end up in the rotor. could do more damage than you think..?!
plus will mess up not only the housing but the compressor also..

Zactly im worried now if the hot side goes it gonna throw off the compressor wheel and when its spinning at how every many thousand RPM its gonna be damaged

What is the difference between the two? if its off a diesel truck its going to be high temp anyhow as its always going to be working at maximum load, it would be different if it was off a diesel golf lol

[Prof]

What do Garrett say - might be worth an email to them to find out what they think.

[meddy]

Zactly im worried now if the hot side goes it gonna throw off the compressor wheel and when its spinning at how every many thousand RPM its gonna be damaged
 
What is the difference between the two? if its off a diesel truck its going to be high temp anyhow as its always going to be working at maximum load, it would be different if it was off a diesel golf lol

Ok first off the wheel isnt the problem. Its the housing itself. It will crack through thermo mechanical fatigue, bits however wont just start dropping off. First thing you will see is what I can only describe as a furring up of the housing. Then after an unknown amount of time (maybe 1 heat cycle I dont know) tiny cracks will form initially and will then slowly propogate through the housing. Eventually you will start to see leakage, but I would guess you\'ld have noticed them by then. Plenty of guys in Norway/Sweden and even the US have run them but generally on drag cars. I cant speak for Garrett, but I can for Holset and we quote 660 degrees as the safe working temp for our housing material. In a petrol engine temps will be well above this.
 
Possibly the tone of my first post was a bit inflamatory and I apologise for that. Basically what Im saying is its OK to use a Diesel unit as long as you except the risks and keep an eye on things.

[m1tch]

Yeah its ok, I am looking for a solution, can\'t find any spare housing though the RX will run at 900C exhaust temps lol add on to the fact I will probably be running high octane race fuel....

[Prof]

I think 900 is a bit high - more likely if you keep it rich you\'ll be looking at mid 700\'s.  Leaner mixtures or retarded timing will likely push up the EGT\'s.
 

• Keep it Rich:
• Wrap the tubby to reduce rapid cooling
• Insure good oil feed into the CHRA, or consider swapping it for a water and oil cooled one to get temps lower
• Have it checked for cracks before you put it on

[rx7pat]

yep 1000cc injectors are a direct swap with the stock ones