JZ 97 SS 1500

iTrader: (2)

Just another turbo update for the community and some info we collected. The (01) wheel and GT40 wheel were tested and put head to head a few weeks ago. We didn't want to post anything till we had something other then SOTP. Keep in mind these wheels are not made by us.

Anyhow both units were tested with NO wastegate. So what it blows is max for what the compressor wheel can make. The margin other then peak #'s was still on average 30rwhp/70rwtq.

The test unit is a custom unit we built for a 03 5.9 Cummins diesel. All we changed are compressor wheels. GT40 wheel came straight from GT703457-2 and both wheels are same basic size on inducer and exducer.

498rwhp/1088rwtq@31psi- GT40 wheel

570rwhp/1280rwtq @57psi - (01) wheel

BTW, the (02) wheel is next up on swapping in. I fully expect to see 600+/1350rwtq broken by a single turbo. Keep in mind this is on a diesel which requires a much higher volume of air and is the ultimate test for a turbo. EGT's were reaching ~1750 deg.



Jose

69firebird

iTrader: (14)

WOW

John Wilde

I will be looking for something more than than the GT4067 in a twin application.
What do you think your turbos could make in a twin application???

JZ 97 SS 1500

iTrader: (2)

Well on a gas application I have no idea yet. Judging by the numbers, looks like these units could get darn close to 900-950hp with only a 63mm. Insane stuff....but until we get the turbocharger test stand working properly I won't know.

BTW, give me a call tomm, I have seen you on some other boards....you seem to know your stuff. We can discuss a few options.

Jose

W8N2SQZ

iTrader: (6)

Looks good Jose. I can't wait to see more results.

Glenn

JZ 97 SS 1500

iTrader: (2)

Long way to go and alot more testing to do.

Jose

JZ 97 SS 1500

iTrader: (2)

One thing I forgot to mention was the MP-GT45's are next. We have one already in testing phase. Looks like they will make some STUPID amount of power and spool pretty quickly compared to the other large units.

John Wilde

Jose,

I got slammed at work today. I will try getting on the phone next week.

Best regards,

JimmyKash

I don't get it....what were you comparing? One wheel was tested at 26psi higher than the other.

were you trying to show how much more efficient the GT40 wheel was at 26psi less?

JZ 97 SS 1500

iTrader: (2)

Jimmy, re-read it again. The GT40 wheel would not make anymore boost....it was done. The 01 wheel continued all the way to 57psi. I stated this was done with NO wastegate. Thats the maximum way to get max flow out of a unit.

Jose

Nine Ball

iTrader: (38)

is the GT40 a 59mm inducer inlet diameter? Does this new wheel just replace the regular GT40 wheel and keep the same housing?

JZ 97 SS 1500

iTrader: (2)

These were the larger wheels from the GT40. We do have the 60mm versions as well and would fit in the GT40's compressor wheel location. . BTW, the GT40 comes in a 60mm and 64mm. If you get techinical the 60 is actually a 58.05mm.

Jose

JimmyKash

aaaahhhh.....

ok, i'm a moron.

Makes more sense

99SS-T

iTrader: (5)

Lemme tell ya if i put 26 more psi in there and got only 72 hp adn 192 tq out of it id be sad. lol jk jk. If i get this right, though, arent you saying that you are pushing 26 psi of hot air? I know it made more power but is it power you woudl want? I can only imagine the flame thrower of a compressor housing after a run liek that. GL man


John

JZ 97 SS 1500

iTrader: (2)

The wheels made more power in the low end, mid range and top end as well. As for heat in the system....its all relative. The GT40 wheel at 30psi outputs the same ~ heat as the 57psi 01 wheel. Remember these are nonwastegated tests. So the wheels are reaching super heated levels equally.

Jose

JZ 97 SS 1500

iTrader: (2)

Ok guys the new 02 wheel is being fitted in and will be testing it. Also we now have new Titanium compressor wheels we will be working into some of our higher boost units. I should have pics of them soon.

Jose

JETmn

You used the same compressor cover for both wheels? How did you think that was even close to fair, unless they were both ground exactly the same? I really doubt the profiles of the wheels are the same.

Also, like was mentioned before, did you have a thermocouple on the outlet of each turbo? I am willing to bet the 01 was blowing much hotter air than the GT40. To only produce less than 20% more power at 85% higher boost is pathetic, unless there was some other bottle neck in the system. Assuming there was no bottle neck, then the 01 has a higher flow capacity, but is not nearly as efficient. Also, what GT40 wheel was it? Check out the GT42 series for the flow you are looking for if you want to test a Garrett.

JZ 97 SS 1500

iTrader: (2)

First of all no thermal probes, and they were not needed. We are testing max output of the wheel. This has been stated several times. A compressor wheel at choke line will have similar superheating properties. Their is some additional heat added due to the additional compression of air. Next the compressor cover is mearly machined differently for the profile of the wheel. Also this is a diesel, not a gas engine, if you know anything about turbos, then you'll know why the difference is not huge (~2:1 consumption vs gas). Also as for 20% more power in relation to higher boost, once again if you have turbocharged enough vehicles you should know as your efficiency drops , hp per psi is not linear. Where we may have been gaining 25hp/psi at the peak efficiency, as we reach the superheated choke line, you may gain .5-1hp/psi for that last 5-10psi. Same principle going from 15-20 psi with a T88, then 20-25psi with the same turbo. Also the GT42 uses a larger inducer...not a fair comparison. You need to run wheels with same basic inducer/exducer. The difference is in the profile, pitch and tip height.

BTW, our EGT's for both are around 1650-1750.

Jose

JETmn

I have been modifying turbo cars for 14 years, so I am not a turbo newbie. It would have been nice if you would have ran both turbo's at the max of the lower one. Then you could have seen in the Garrett was more efficient even though it was at max flow.

The compressor cover is also a huge difference. Maybe the Garrett had too tight of tolerances around the center portion of the wheel and caused a decrease in flow? Both wheels should have been in their native compressor covers to make this fair.

Which GT40 wheel was it? It is difficult to tell much useful data from your test, but to get a comprehensive test is very difficult. At least you are trying, which is more than I can say for a lot of companies.

JZ 97 SS 1500

iTrader: (2)

The 01 wheel made more power throughout the entire range. The GT wheels are nice, but their are better wheels out there. As for the compressor covers not making the test equal, actually that is what makes the test equal indeed. Machining the compressor covers for the wheels was minimal and you have to run certain clearences for the wheels to work. Both now use the same compressor cover to draw air through, compress and discharge the air. If you use different compressor covers you have now changed another variable since the compressor cover A/R may change. We have alot more testing coming soon.