Att dyno results

[Big T]

My wife loves Cody. Very picturesque. It's got the Buffalo Bill Museum, rodeo, Sierra Trading Post, and that old whore house turned steak restaurant neat the rodeo.

 

[malibu795]

thats little more then stock lb7 rw power range

 

[6.5L]

just swapped housings. What a difference! This thing rips. Boost is now up and torque has improved just by the seat of the pants feeling. Turbo blanket is also on now. Will keept posted

 

[wyattearp]

It would be interesting to see what it dyno's out at. Good job.

 

[buddy]

just swapped housings. What a difference! This thing rips. Boost is now up and torque has improved just by the seat of the pants feeling. Turbo blanket is also on now. Will keept posted

That is what I expected. That low end torque is essential for some guys, and the extra air mass from boost might lower EGT if you werent getting a complete burn before.

 

[Slim Shady]

It will be interesting to see the differences in the torque curves and peak horse power. Guess the bad housing wasn't that bad to make those numbers stock. Maybe the guys with a 4:10 and lower gear set would benefit from the larger housing towing. I wonder if the mileage would be better towing with the larger housing? Maybe offer both housings?

 

[Edzzed]

It will be interesting to see the differences in the torque curves and peak horse power. Guess the bad housing wasn't that bad to make those numbers stock. Maybe the guys with a 4:10 and lower gear set would benefit from the larger housing towing. I wonder if the mileage would be better towing with the larger housing? Maybe offer both housings?

How would I know which housing I have.

 

[Slim Shady]

How would I know which housing I have.

Ed you have the normal housing that I originally intended for the A Team Turbo. The housing that made these numbers was the housing that was stated to be bad by some members here that now reside elsewhere. Guess it isn't that bad, the housing design you have will get some numbers as well. Kind of poetic justice considering how badly this housing was admonished by a couple of people.

6.5 L and his dad are real good people and never got excited about the issue. Sent him a replacement housing along with everyone else that wanted to exchange the larger housing for the original A-Team Turbo Housing.

ON that note I sent snail mail letters to everyone that has the larger housing asking if they wanted a replacement housing for their turbo. Only a few wanted to exchange the houisng they had.

Like I noted before the larger housing is running on a 35 foot motor home towing a 20 foot trailer out west and the guy states he went from 7 to 9.5 mpg and is very happy with his performance. That being said he probably has 4:56 or lower gears. Which I think would be a great match for this setup. Our 6.5 likes to run at around 2400 to 2500 rpm. This motor is a high speed diesel not a low rpm high torque motor.

 

[6.5L]

I think people that tow all the time might like the bigger housing. Like the guys with 4:10's and up. I know when I pull in 4th, doing 65 is at like 3300rpm. Where that turbo shines. I personally kind of like the smaller housing just because I do not tow a whole lot and my bottom end picked up a lot. I got to thinking about it earlier. I think the smaller housing will make peak torque sooner but won't carry it out near as far as the large housing did. I am not sure where horsepower would go. Guess I am just going to have to get it on the dyno. It should be within the next few weeks. I got to buy my friends water/meth and get it installed and dialed in and use to it and how my truck reacts to it then I am heading to the dyno.

 

[wyattearp]

I am interested in the changes as well. As I said I am doing a frame off restoration on a 85 Chevy CCSB. I have been getting a lot of arm twisting to put in a Cummins 12v. Though I am partial to keeping it all GM. That said I am looking at having enough hp for a daily driver with towing on occasion (10%) of the time. I am not looking to try and really tweak the motor. Thanks and look forward to seeing the results

 

[WarWagon]

I am interested in the changes as well. As I said I am doing a frame off restoration on a 85 Chevy CCSB. I have been getting a lot of arm twisting to put in a Cummins 12v. Though I am partial to keeping it all GM. That said I am looking at having enough hp for a daily driver with towing on occasion (10%) of the time. I am not looking to try and really tweak the motor. Thanks and look forward to seeing the results

You will have all sorts of clearance issues with the AC box and the 6.5 turbo setup. You would have to get a Banks manifold and other changes I am not 100% on. A custom exhaust and turbo relocated would be more efficient.

Make sure you have diamond precups for a turbo 6.2 build!!! I can't stress this point enough so learn from my experience. My 1995 has military 6.2 NA precups that are larger than civilian 6.2 precups. I had to have a custom tune made to get the ATT to work with them. The 6.2 precups with a turbocharger will make you miserable with smoke and limits on boost and fuel that you can use. They hold you back as they were designed for NA after all. You can only get so much air though the precup hole. So a larger hole will allow more air to move out of the precup. You know the burning and hot expanded air? It has to get out of the precup to push the piston at higher RPM and boost/fueling levels. This trades off the high MPG complete burn small NA 6.2 precups for power. Higher RPM and load the 6.2 precups smoke bad in NA use anyway. I read where the Banks sidewinder did not completely clear the smoke on 6.2's.

You remove the heads and injectors. Then the precup can be tapped out through the injector hole. New precups go in after cleaning the carbon out of the head and make sure it is flush with the head when fully seated. (There is a spec for this that can be looked up.)

You will also need turbo spec injectors. Also possibly short body depending on how you set the manifolds/turbo up.

Going NA to turbo will loose some MPG. Having your truck get out of it's own way is a plus. Staying with traffic while towing makes a turbo a good choice.

Make sure you pull the oilpan and check your 6.2 for mains cracks while you got everything torn down.

 

[buddy]

I think people that tow all the time might like the bigger housing. Like the guys with 4:10's and up. I know when I pull in 4th, doing 65 is at like 3300rpm. Where that turbo shines. I personally kind of like the smaller housing just because I do not tow a whole lot and my bottom end picked up a lot. I got to thinking about it earlier. I think the smaller housing will make peak torque sooner but won't carry it out near as far as the large housing did. I am not sure where horsepower would go. Guess I am just going to have to get it on the dyno. It should be within the next few weeks. I got to buy my friends water/meth and get it installed and dialed in and use to it and how my truck reacts to it then I am heading to the dyno.

Dont be too surprised if torque still holds on pretty long. Sometimes bigger isnt necessarily better, as long as the smaller option still flows well enough, and the extra boost can also help sustain torque if there is fuel you werent burning before. The faster spooling seems to have pepped it up nicely by the happy response, and you may have more max torque than you had before at lower RPM.

I can honestly say I personally would not like using the larger housing, it would be completely unacceptable to me. I can understand other people's frustration with it, as it would be sluggish, especially to those with 3.42 and 3.73 gears who may also have taller tires, and if you haven't tried it at 5000ft elevation you dont know what kind of black smokescreen that could be. The dyno results explain that completely, the loss of a lot of low end torque, considering the L65 was rated at 430 ft-lbs at 1800rpm, and you were around 300 ft-lbs there, which is a big loss even considering at the wheel to at the flywheel. How people handle their frustration is another story that doesn't need to be discussed. The larger housing and potentially a new set of injectors helped, but mainly shifted the RPM curve which is going to increase horsepower at higher RPM, because HP is a factor of torque and RPM.

You dont have to pull in 4th when towing when your truck makes enough power at lower RPM, it could be more efficient in 5th when towing at 2600-2800rpm.

 

[6.5L]

I can admit that being at elevation doesn't help much either. Where I dyno is at 3600ft but my hometown is at 5000ft and work is at about 6000ft, so I don't mind having the boost pressures up a little to help power at elevation. I am excited to see the difference the housing makes, and the difference the water/meth will make. Should be interesting.

 

[buddy]

I can admit that being at elevation doesn't help much either. Where I dyno is at 3600ft but my hometown is at 5000ft and work is at about 6000ft, so I don't mind having the boost pressures up a little to help power at elevation. I am excited to see the difference the housing makes, and the difference the water/meth will make. Should be interesting.

How would you compare the smoke accelerating from a stop or driving up grades from the GM3 to this ATT housing to the larger housing?

 

[6.5L]

GM-3 did not hardly smoke once it spooled but it didn't have any pull really. It was worthless above 2000rpm. The large ATT housing smoked a bit in 2nd gear but it cleaned most of it up, and that was onloaded. Loaded, it cleaned all the smoke up and pulled hard until redline. The smaller ATT housing smokes a little but once it spools, it cleans all the smoke up and pulls hard unloaded. have yet to put a load on it.

 

[iamdave0887]

I read where the Banks sidewinder did not completely clear the smoke on 6.2's.

It doesn't, trust me. I'm running a good bit of fuel on my K-5 with the Banks kit. Somewhere around stock 6.5 levels perhaps, with i'm guessing "C" code precups. It's a goodwrench crate, so i'm not sure if GM used one precup for all engines and just bolted EGR intakes on or what.

Under heavy accel the truck smokes gray, even with 4-6 lbs of boost on a turbo that breathes a lot better than a GM-x. It does pick up much better with the turbo, but there's always a big cloud until the charger catches up then a gray-ish haze when giving her a good bit of go-go juice.

It seems to be worse when the engine is cold, versus warmed up. I don't hammer the piss out of that truck much due to it's axle gearing. It gets driven like a old mack, below 2200 RPM 80% of the time. Highest it's been run with a load on it is about 2800 RPM in Low and 1st gears.

 

[buddy]

GM-3 did not hardly smoke once it spooled but it didn't have any pull really. It was worthless above 2000rpm. The large ATT housing smoked a bit in 2nd gear but it cleaned most of it up, and that was onloaded. Loaded, it cleaned all the smoke up and pulled hard until redline. The smaller ATT housing smokes a little but once it spools, it cleans all the smoke up and pulls hard unloaded. have yet to put a load on it.

I think you'll be happy with how it pulls with this housing. When youre at that elevation I suppose you expect some smoke when accelerating off the line with any diesel truck. Definately clears up once the turbo spools up. I think that was part of GM's decision to use a small turbo, preventing most any smoke and emissions, although they just went too small.

 

[6.5L]

Pulled a 8500lb trailer today. it was hard to get into it because I dont think the two horses in the back would have appreciated it, but it pulled great. couldnt complain. minimal smoke. Spooled quick. im happy with it

 

[wyattearp]

How many miles on your motor?

 

[6.5L]

Motor is a Teds Truck tearout. They pull them with between 10-40K miles on, according to their site. Optimizer 506 NA block. Was in good condition when we got it. A little rusty sludge on the inside but nothing flushing the system didn't clean out. I put that motor in at 371,000 miles. I am now at 382,000 miles, and between then and now I have put that motor through hell and it seems to be holding up just fine. I am really gonna try to shoot for the moon next dyno run. We will see how it holds up then.