Chage back from my GT 3071R to my K04

[Booster]

My Garret ball bearing started to make a strage "hizzing" noise, so I took it out and intalled the factory snail in. No easy task!

Well I though that if my motor has not blown in 40,000 miles with the GT, what the hell, lets install the factory K04 and play it safe, may be this is a message from the Mazda god.

I went to my local TURBO repair facility and only to find out this GT turbos are not reparable, and a NEW center section has to be bought.

To do a long story short the diference between having the GT with a conservative tune vs havin the K04 with an agresive tune is day and night.

I feel my car lost 3 of its 4 cylinders, it feels completly anemical.

I ordered the new center section for the GT today. Cant wait to have my GT turbo back!

 

[bova80]

man that sucks. thats awesome that you were able to run it for so long though without any problems.

 

[opt_ms3]

wow nice catch dude. let us know when you get that gt30 back!

 

[LBV]

Thx for the post Booster comparing the 2 turbos ... are you sure you're boosting fully on the K04 (ie. 15-16 psi)?

Also, how much sooner in the rpm does the K04 spool?

 

[InlineTwin]

This is my assumption about your install but it is commonly overlooked because turbos have traditionally been unaffected by engine oil pressure. In the recent development of ball bearings supporting the work shaft (as opposed to journal bearings) it has been largely overlooked that the turbo requires a limited oil inlet pressure.

Several people have posted the center section shot in their BB turbo. There is a glaring oversight in the installation of these turbos be it a kit or diy fabbed. The oil pressure in this engine is much too high for the bearings. In a journal bearing it doesn't care what the pressure is, but the ball bearings are sensitive to oil pressure. Put a restrictor upstream of the turbo to limit pressure to 40 psi. The turbo will last much longer.

If you do have a restrictor installed you may need to check the pressure at the oil inlet to ensure it is correct.

 

[Booster]

Re:

Thx for the post Booster comparing the 2 turbos ... are you sure you're boosting fully on the K04 (ie. 15-16 psi)?

Also, how much sooner in the rpm does the K04 spool?

Well the K04, has instant response but it will fall short very quick.
My current tune I am boosting 16 to 17 psi.

The difference is that the GT keep working overtime. I don't have the Trottle flash yet.

And with the GT I don't feel the power cut-off.

 

[Booster]

This is my assumption about your install but it is commonly overlooked because turbos have traditionally been unaffected by engine oil pressure. In the recent development of ball bearings supporting the work shaft (as opposed to journal bearings) it has been largely overlooked that the turbo requires a limited oil inlet pressure.

Several people have posted the center section shot in their BB turbo. There is a glaring oversight in the installation of these turbos be it a kit or diy fabbed. The oil pressure in this engine is much too high for the bearings. In a journal bearing it doesn't care what the pressure is, but the ball bearings are sensitive to oil pressure. Put a restrictor upstream of the turbo to limit pressure to 40 psi. The turbo will last much longer.

If you do have a restrictor installed you may need to check the pressure at the oil inlet to ensure it is correct.

It make sense, I will look in to that.

 

[LBV]

. I don't have the Trottle flash yet.

.

Be careful with the full throttle flash as many who've done that and have a big turbo have gotten boost creep ... if it's working for you as is I'd say leave it alone.

 

[Booster]

Re:

This is my assumption about your install but it is commonly overlooked because turbos have traditionally been unaffected by engine oil pressure. In the recent development of ball bearings supporting the work shaft (as opposed to journal bearings) it has been largely overlooked that the turbo requires a limited oil inlet pressure.

Several people have posted the center section shot in their BB turbo. There is a glaring oversight in the installation of these turbos be it a kit or diy fabbed. The oil pressure in this engine is much too high for the bearings. In a journal bearing it doesn't care what the pressure is, but the ball bearings are sensitive to oil pressure. Put a restrictor upstream of the turbo to limit pressure to 40 psi. The turbo will last much longer.

If you do have a restrictor installed you may need to check the pressure at the oil inlet to ensure it is correct.

You know if there is actually a recomended restrictor for this aplication and where to get it?

JC