can ANYBODY get ATT specs? comparison thread

[pacificdrumma]

I am torn between the ATT or a Chinese HX40. I have read several threads on the subject, and I would like to see if we can get a numerical comparison. I know that numbers are only relative, and street performance and dyno pulls, etc are the real judge, but still, can we get some numbers going on here just to see? Im thinking along the lines of inlet size, compressor wheel, exhaust housing, things like that. Just to see how they stack up on paper.

Also, I mentioned this in my meet my truck thread, but its more on-topic here: I have seen both a plain HX40WII and a CKO HX40WII. What are the differences? I read on DP that one has a 57mm compressor wheel and one has a 60mm. I have heard there is a 6 blade and an 8 blade. Whats up with that??

 

[Burning oil]

I just posted this same info in your other thread. I tried to list the "other" turbos attributes too, but in the format I used it just became a tangled mess.
I actualy dont know the numbers on the housing, but can get other messurements for you if you like.
Like you said to though I really dont care about the numbers in this case. I look at the results. To throw a bunch of numbers out there could confuse pepole even more?

These are just some things that came off the top of my head.
Im alittle bias so FWIW:
ATT
ATT has great customer support.
ATT is a complete bolt on kit everything you need.
ATT is quieter.
ATT does same work with less boost = less stress on engine.
ATT gives better MPGs, quickly paying for itself
Non wastegated.
Can be used with a diverter or QSV.
Support for custom tunes being developed by ATT developer.
Pick up the phone and get tech support.
Sales of ATT enrichen 6.5 community because as supporting vendors sales help us continue to develope new products.

These were just off the top of my head benifits of the ATT.

http://leroydiesel.com/Air_filtration.html
BTW!! just the fact that Im making this post on July 4th (of all days!, I should be drinking a beer) should show the level of customer support for the ATT. Where is the support for any other 6.5 turbo?

 

[WarWagon]

The Ebay turbo's vary in blade count and other dimensions as they please. The ATT gets recalled for an out of spec housing. The HX40II I tested had a different blade count and the seller pleaded ignorance.

The HX40II was a treasure hunt to get all the parts needed to make it work. The ATT kit is a few clamps short of a complete drop in kit.

The HX40II tops out around redline. The ATT has room at redline for load to drive boost up some.

The ATT with a BD Spool Valve is a completely different animal than either turbo alone. It gives you the low end and allows the top end to be there.

The ATT generates the same power on 14 PSI of boost that the HX40II does at 23 PSI. The backpressure to boost ratio is a relevant number.

 

[pacificdrumma]

Sounds like ATT for me

 

[Slim Shady]

I thought dyno numbers were the quintessential numbers? Now there was a thread that spelled out everything about the turbo, was a few years back. Been asked for a compressor map as well because they tell all. Fact is everything is a crap shoot until you run it and find out how the dam thing works in real life. That we have down pact, more than enough of the turbos out there and more than a few with close to 80000 miles on them. So not really sure that the numbers will help with any comparison that has not already been done on a truck, real life always trumps calculated. ANY turbo over the GM 4 will be an improvement. Good luck with what ever you go with. Oh and nice truck, welcome tot he forum, you will find a lot of good knowledge here.

 

[pacificdrumma]

I just wanna know specs for knowledge sake

 

[Big T]

I thought dyno numbers were the quintessential numbers? Now there was a thread that spelled out everything about the turbo, was a few years back. Been asked for a compressor map as well because they tell all. Fact is everything is a crap shoot until you run it and find out how the dam thing works in real life. That we have down pact, more than enough of the turbos out there and more than a few with close to 80000 miles on them. So not really sure that the numbers will help with any comparison that has not already been done on a truck, real life always trumps calculated. ANY turbo over the GM 4 will be an improvement. Good luck with what ever you go with. Oh and nice truck, welcome tot he forum, you will find a lot of good knowledge here.

I've done 44,000 miles on my ATT. Don't know how many miles the PO had on the ATT, but pretty safe to say there's at least 50,000 on it. The only problems I've had is the downpipe popping out of the band clamp and the silicone tubes connecting to the intake stretch out and blow off. Otherwise, it's been great.

 

[JayTheCPA]

I just wanna know specs for knowledge sake

Publishing specs opens the vendor to duplication by others, so holding back on the finer details is sometimes a method of self preservation to protect all the hard work and R&D.

I had a lengthy chat with one of the vendors (not naming names so as not to start anything) and asked for some details to help me decide why a specific part (not naming part) was worth ~$650 more than what I could get from RockAuto as folks here on TTS use the lower cost item with good results; reply was that his part was well tested / proven, was guaranteed to work as intended, and there was no interest to post more information lest others copy and steal the work.

So back to the original quest, the best the rest of us can do is research on the forum and go by real world results based from volunteer efforts of the community. Sure it makes comparison a little more of a challenge as the numbers are not available to drop into a spreadsheet, but it also allows for a richer understanding of how given parts are good, but might have sweet-spots which may, or may not, work toward personal goals for the truck and fit within budgets.

 

[littleboy]

I thought dyno numbers were the quintessential numbers? Now there was a thread that spelled out everything about the turbo, was a few years back. Been asked for a compressor map as well because they tell all. Fact is everything is a crap shoot until you run it and find out how the dam thing works in real life. That we have down pact, more than enough of the turbos out there and more than a few with close to 80000 miles on them. So not really sure that the numbers will help with any comparison that has not already been done on a truck, real life always trumps calculated. ANY turbo over the GM 4 will be an improvement. Good luck with what ever you go with. Oh and nice truck, welcome tot he forum, you will find a lot of good knowledge here.

Care to explain why you are the only person i know selling turbos that won't give out every spec on your turbo? Any other place i buy a turbo from will give me every detail about their turbo. I refuse to buy from someone who just says, my turbo is big enough. That doesn't tell me if the turbo is going to work in my specific situation ....

 

[littleboy]

The Ebay turbo's vary in blade count and other dimensions as they please. The ATT gets recalled for an out of spec housing. The HX40II I tested had a different blade count and the seller pleaded ignorance.

The HX40II was a treasure hunt to get all the parts needed to make it work. The ATT kit is a few clamps short of a complete drop in kit.

The HX40II tops out around redline. The ATT has room at redline for load to drive boost up some.

The ATT with a BD Spool Valve is a completely different animal than either turbo alone. It gives you the low end and allows the top end to be there.

The ATT generates the same power on 14 PSI of boost that the HX40II does at 23 PSI. The backpressure to boost ratio is a relevant number.

Hx-40II is very different from a genuine Holset Hx-40. Please do not compare the 2.

 

[JiFaire]

Let's see now...

The turbo specs will include number of blades, compressor diameter, turbine diameter, housing aspect ratio, housing volumetric flow spec, and a bunch of other variables and complex equations for working with those variables in a given atmospheric environment.

Suppose somebody gave you a bunch of numbers for the various turbos... are you guys trying to tell me that you are expert enough in the science that those numbers will let you make informed, qualified decisions?

All the vendors will tell you that their turbo is good. Dennis, Matt, Garrett, Holset, even people flogging the GMx. Here's the bottom line:

If you want to buy an ATT, go ahead. Lots of people will cheerlead your choice.

If you want to buy a CKO, go ahead. Lots of cheerleading there, too.

I even know people who think you should buy a GM-8. Have at it, if that floats your boat.

Whatever you buy, you can get help here from people who know lots about each specific turbo.

What you won't get here is a soapbox where you can bitch at people because they won't do what you want them to.
If Dennis doesn't want to post his specs, that is entirely his call.

If you don't want to buy something, don't buy it.

Jeez.