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Replacement turbo

skypilotj said:
I need to fill out my sig so you all know what I am working with. its a 98 K3500 CC DRW with lift,tires and bumpers. It represents my off road fabrication business. I got it with 96k on the odo last June and have done a complete resto. Its maiden voyage was round trip to Texas from Oregon with horse and trailer. Stock performance and fuel consumption was a dissappointment. I have planned all of the normal bolt on upgrades. But before I do the exhaust I want to do a better turbo in case I have to fabricate a custom down pipe. The ATT has good reviews and more. I like my waste gate. Its just a personal preference. If I could get the ATT trim with ball bearings it would increase the coolness factor. Coolness and performance is more of a priority than cost.
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Garrett makes the Gt 37 in ball bearing, i would go with the stage 3 kit for the Cummins as that is a nice size for the 6.5 and it is water cooled which is nice as this helps keep the oil temps down. Plus it sounds cool! You should be able to find a kit for around 1500, but keep in mind you will need to do a little adapting on the exhaust side.
 
littleboy said:
Att is not ball bearing. Wat you may think is acceptable lag the next guy may not like it at all. And yes a ball bearing turbo will definately reduce lag but whether it's worth the extra cost is debatable .
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I think people are mistaking lag for not seeing the boost gauge move. After buying one(ATT) I wood never go back. Truck accelerates better at 0 PSI of boost than the GM 8 did at 4 or 6 or 8. The truck accelerates better from idle to 1/8 throttle than it did with the GM8 idle to 1/2 throttle. And I'm thinking if the next guy has noticeable lag, he has something wrong with his truck.
 
Wow. Everyone gets hung up on the word LAG. What was the topic again? Oh yeah. Ball bearing turbos?
 
Generally, guys with 4.10s have plenty of off the line capability without boost. Some of us with 3.42s might not, but I would say it still works just fine but because of that I do have less launching power. Once it spools there is more power, and lites up real fast when already cruising on the highway, RPMs already up. ATT boost up past 1800rpm, other turbos lite closer to 1000rpm. That meets my definition of lag, even though its not a gasser that doenst boost until 4000rpm. Variations in idle timing, idle RPMs, transmissions, wheel height, gear ratio, ect....will all change how the truck feels at low RPM.

That GT37 looks pretty good, especially because available in T3 mount, and the ball bearings are a great thing for performance and reliability, although its a pricey turbo. I wish they would tell you the radius of the housings or just tell us the cross sectional area rather than A/R. Seems like its compressor housing is bolted on, so it will be shorter front to back than those with v-band compressor housings, but better than the snap ring type for adjustment.
 
JiFaire said:
No, actually, the topic was Replacement Turbos. Ball bearing turbos is a recent derail to the thread ...
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My mistake. Replacement Turbos. Can you get a replacement turbo with ball bearings with similar function to the ATT?
 
skypilotj said:
My mistake. Replacement Turbos. Can you get a replacement turbo with ball bearings with similar function to the ATT?
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PAGE 1 FIRST POST

REPLACEMENT TURBO

With shortage of GM-X turbos and wanting better boost production member Slim Shady found wholly by accident a turbo that seemed like a winner for the 6.5, a Mitsubishi TD07-22A used on Fuso trucks and some Mitsubishi heavy earthmoving equipment, he shared a source with me and I got one myself.

A Mitsubishi p/n ME 032938 or 6D15T, off of a piece of HD equipment with a larger engine than ours, needing lots of cfm rite off the line, & abililtiy to maintain cfm, it is non waste gated, description from Slim is that it does same work at 3 psi that the GM-8 does at 5-6 psi, no exhaust back pressure issues, and with an intercooler is about 10 deg above ambient on IAT, GM-8 with a large IC is about 30 over ambient.

He also found a Chinese copy which I will also test on my K1500, best of the 2 will go on the K1500 truck project engine, and worst of the 2 will go on the Burb.


The A-team could be manufactured with ball bearings but the cost would certainly not make the turbo useful for the 6.5 crowd. A few maybe but not many. So no, there will not be an A-Team with ball bearings, I cannot recover the cost of the re manufacture and since cost is the driving factor for most ( it aint going to happen). This was the A-Team replacement turbo thread. So your topic is out there You should start a thread solely on the turbo you are considering and discuss it at large.


 
Slim,
Sorry to bring back a dead thread that is nearly a year old. I have read almost all of your posts on the ATT. I have been lurking on this site for far longer than I have been a member. This site was key in my decision to buy and resurrect a 6.5 that would have been bound for the scrap yard. It turned out well and has an unbranded title. As much as I wanted a DMax I didn't want to work on one. Besides everyone has a DMax and the payments to go with it. I own my truck free and clear. That doesn’t mean I haven't spent a ton of money and time rebuilding tho.It gets complements everywhere I go.
Around here (My home) people will dump more money than I originally paid for my truck on a BB turbo to bolt onto a ricer that will never do what a 6.5 can do or last as long. So in my market BBs are king. So it seems to me if you build it they will come.
It seems that many members here are overly protective of the ATT and defend it if the slightest innuendo is spoken against it. In reading all of the ATT posts the honest truth is there are things the ATT can do and things it can't.
So that leaves me the option of buying an ATT and dissecting it to find out what makes it different than a Mitsubishi p/n ME 032938 or 6D15T. Or politely asking what a good BB equivalent would be.
I will now put on my fire resistant suit and you all may flame on.
 
No flame suit necessary, some of us are protective of it because many have flamed it, and never seen or run one. In some instances it is due to their own motives. Discussion about it is banned on another site.

I have never flamed another turbo but will defend the ATT, I have pulled 36,000 lbs gvw with it.
 
NVW said:
No flame suit necessary, some of us are protective of it because many have flamed it, and never seen or run one. In some instances it is due to their own motives. Discussion about it is banned on another site.

I have never flamed another turbo but will defend the ATT, I have pulled 36,000 lbs gvw with it.
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Exactly
 
NVW said:
No flame suit necessary, some of us are protective of it because many have flamed it, and never seen or run one. In some instances it is due to their own motives. Discussion about it is banned on another site.

I have never flamed another turbo but will defend the ATT, I have pulled 36,000 lbs gvw with it.
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Thats something it does well. I was one of the early buyers and am pleased with it. But I will describe it the way it works, which includes spooling at a later RPM, referred to as turbo lag, however acceptable it is. For me, where most driving is around town and short highway runs it makes it slower off the line, no economy advantage. Until I jump on the interstate or climb the rocky mts driving through Colorado on the interstate, in situations that it excels at. It also excels at 130mph, I can tell you that from experience.

So unless you know for a fact how it works for people with their configuration and use, you shouldnt say it has no lag. If I have less torque at 1500-1900rpm from less boost would you not consider that lag? If I have more black smoke, would that not be considered due to lag? So dont say it doesnt have lag, it has some, its not a lot, and it is acceptable to the majority of people. Its just an honest evaluation of its performance. Its honestly tons better than a GM8, but spools slower. Would I ever rather have a GM8, no. Would I ever rather have something else that is larger than a GM8, but still spools faster than an ATT, yes for my configuration and use, unless Im trying to set a speed record. Would I recommend the ATT to others, yes and I do all the time, its been a staple in my personal list of recommendations for a couple years. Might I recommend something else to people in certain circumstances, yes. Ultimately its a very good match to the 6.5, great for reliability and max power, that doesnt mean it cannot be compared to other turbos for differences in performance. And when it is, those people get told they are crazy or get a lecture.
 
Fair enough, I just report my own findings and with my heavy truck lag isn't noticeable, little black smoke.

It may not build instant boost like a GMx, but with less drive pressure it would be somewhat offset.

In my case 0-60 is quicker with the ATT.
 
Buddy, I have read many of your posts and respect your advice and knowledge. I looked at the GT 37 and with no wastegate I don't think its what I'm looking for. Like I said if I had to pay more to get the best of both worlds then I'm okay with that.
 
buddy said:
Thats something it does well. I was one of the early buyers and am pleased with it. But I will describe it the way it works, which includes spooling at a later RPM, referred to as turbo lag, however acceptable it is. For me, where most driving is around town and short highway runs it makes it slower off the line, no economy advantage. Until I jump on the interstate or climb the rocky mts driving through Colorado on the interstate, in situations that it excels at. It also excels at 130mph, I can tell you that from experience.

So unless you know for a fact how it works for people with their configuration and use, you shouldnt say it has no lag. If I have less torque at 1500-1900rpm from less boost would you not consider that lag? If I have more black smoke, would that not be considered due to lag? So dont say it doesnt have lag, it has some, its not a lot, and it is acceptable to the majority of people. Its just an honest evaluation of its performance. Its honestly tons better than a GM8, but spools slower. Would I ever rather have a GM8, no. Would I ever rather have something else that is larger than a GM8, but still spools faster than an ATT, yes for my configuration and use, unless Im trying to set a speed record. Would I recommend the ATT to others, yes and I do all the time, its been a staple in my personal list of recommendations for a couple years. Might I recommend something else to people in certain circumstances, yes. Ultimately its a very good match to the 6.5, great for reliability and max power, that doesnt mean it cannot be compared to other turbos for differences in performance. And when it is, those people get told they are crazy or get a lecture.
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That is weird. I can't believe it is that different from 3.42 to 4.10. But I am curious as to why. I had a suburban lifted with 36" tires and it had 3.42, I put 4.88 in it and really didn't notice much of a difference in power. I have way better acceleration from idle to say, 2000 rpm than the GM 8 ever did. No smoke, unless I really stomp on it and even then it doesn't smoke very much. I noticed 1-2 miles per gallon better on highway than the GM 8, but around town I haven't noticed really any. But I have been getting on it and I was dealing with a lack of fuel problem, so I have been checking fuel pressure under hard acceleration.
 
If you have a heath GLE, those programs I have seen limited you to stock fuel levels, except sustained it longer and bumped up timing a lot. So you wouldnt know necessarily the difference in performance that you could have. There should be a huge difference in acceleration and how fast your RPMs increase with 3.42 to 4.88 gears. Unless you swapped gears and put the tall tires on at the same time since that counteracts one another.

The lower your gearing the faster your RPMs increase, and more times the tire will spin for every engine revolution. So you have more tire spinning performance with less engine torque in NA, no boost mode.
 
I know how gears work. I've been a mechanic for almost 20 years. I had the 36 for a couple years before before I did the gears. I had to be doing 80 MPH before I could use overdrive because the RPM's were so low. But after I did 4.88 I thought I would notice a big difference in power, but it still didn't pull a trailer very well(power wise), it just didn't feel like it made much difference. That was my old suburban. Interesting on the GLE. When I did the reflash from Heath I really didn't notice anything much, it felt like it had a little more power, but not much. So I sent it back and they reflashed it again. Still didn't notice too much, then I called and asked him to reflash it to the GL4 program, but he really didn't want too because I use the truck to mainly tow and said I would get the exhaust temps too high and so I just kind of gave up on it. I should have told him to just refund my money, because even when I threw my stock computer back in to ship him the reflash, it didn't seem any different, other than it seemed to keep the converter locked a little longer.
 
I have the factory G80 option with 4.10 gears and 33inch tires. It gets me around muddy jobsites. Plus 4x4 once in a while if it gets too bad. Thought about 4.56s tho.
 
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