Stock Turbo capabilities

[93T3R/T]

This may have been discussed in the past but here goes... what is the approx' WHP capabilities of the stock TD06 and at what psi does it begin to become inefficient. Can anyone give some approx' size #'s for the stock, compressor/exhaust wheels and housings in more of a Garrett style comparison??? Any and all help would be immensely appreciated!
Thanks,
Dan

 

[AXXE]

I can run up to 18 psi with good results. Once it goes over that, the truck noticeably lays down up top. I lose about 5 mph with 20 psi.

 

[Tooky]

I think it will depend tremendously on the motor behind the turbo. But for reference and comparison, my (stock turbo) truck makes tremendous increases in power going from 18 PSI to 20-20.5 PSI. At the 21-22 PSI range it loses enough power to feel it "fall on its face". So even among the same motor, there are differences. FWIW my turbo is not in the best of condition and is what I would consider "may need rebuilding", i.e. shaft doesnt seem to spin as free as I'd like but at the same time doesn't seem to be effecting power output.

 

[Daron]

I think it will depend tremendously on the motor behind the turbo. But for reference and comparison, my (stock turbo) truck makes tremendous increases in power going from 18 PSI to 20-20.5 PSI. At the 21-22 PSI range it loses enough power to feel it "fall on its face". So even among the same motor, there are differences. FWIW my turbo is not in the best of condition and is what I would consider "may need rebuilding", i.e. shaft doesnt seem to spin as free as I'd like but at the same time doesn't seem to be effecting power output.

To keep it in context, Tooky's motor is an L-35 replacement motor so your results may vary.

The map for a stock turbo shows it goes way out of its efficiancy range at 18psi. I ran mine at 20 psi, but the difference in MAT's at 20psi and at 17psi were dramatic...

 

[just a 6]

Somebody told me after looking at the 17C turbo map that the stock turbo looses efficency (spelling) over 18-19psi. Correct me if i'm wrong here?

 

[Methuselah]

http://www.tragacs.com/turbo.html
________
TOYS LESBIAN

 

[Daron]

LOL your comment is laughable! If my motor flowed better by virtue of having "magic heads" or whatever, don't you think the turbo's efficiency would be reached at that much LOWER of a boost level??? Think about it, boost is also a measurement of restriction! I think you suggested evidence supporting the complete opposite point you intended to. :wink:

I only said your motor is not stock syty issue and that your results may vary, nothing more nothing less. Do not attempt to turn this into a flame fest tooky, you will be slapped down.

I also mentioned the difference in MAT readings I experienced at different boost levels, which BTW are an indicator of where the turbo is operating, efficiency wise.

Again, take your attitude elsewhere. I suggest you take your recent sabatical as a opportunity to start over and conduct yourself appropriately in the technical area's.

 

[Buster]

Just because the efficiency is dropping off by 18psi doesn't mean it won't make more power at 21-22. It may not make as much power per psi (gain wise) but its very possible to push the stock turbo way beyond its efficiency and make some gains. I think the power loss people are see above 20 psi is ignition, your blowing out spark and losing major power.

My 70mm seemed to lose power up high too, the turbo should support 28-29 psi, but that was not the case. Another example is the buick guys, they seem to have considerable gains with high boost, unlike us, I'm guessing it has something to do with their ignition.

 

[Daron]

Just because the efficiency is dropping off by 18psi doesn't mean it won't make more power at 21-22. It may not make as much power per psi (gain wise) but its very possible to push the stock turbo way beyond its efficiency and make some gains. I think the power loss people are see above 20 psi is ignition, your blowing out spark and losing major power.

My 70mm seemed to lose power up high too, the turbo should support 28-29 psi, but that was not the case. Another example is the buick guys, they seem to have considerable gains with high boost, unlike us, I'm guessing it has something to do with their ignition.

I didnt see a ET gain by going from 20 psi to 22 on the stock turbo, it actually ran the same ET with a lower MPH, consistantly. The variables are just too numerous to got into , but maybe the lesson here is to slowly approach max boost vs. knock and find out where the limits of your setup are... Preferably without hurting something.