Turbos & intercooling

[ak diesel driver]

I actually have a line on a used one here if I can make a good enough deal I might try it just for kicks. I'd mount it in place of my vacuum pump so it should actually clean up the engine bay a little.

 

[buddy]

Buddy -

Just to clean up a few loose ends:

2. Lower backpressure is not necessarily the reason for lower IAT's. As mentioned before, aerodynamic improvements to a compressor wheel, lower operating pressure (ratio), or improved operating conditions, these are reasons for lower IAT's.

Regards,

Yeah, all those efficiencies correlate to a lower backpressure needed, this turbo requires less pressure differential, and increased backpressure would cause the heat transfer to the intake air.

 

[Slim Shady]

So after my head kools down, are we all in agreement that there is a gain, and that given an unofficial reporting we can speculate with some certainty that the ATT A-Team Turbo is a plus for our motor???

 

[Turbine Doc]

benefit to our motors no that is a different set of calc's & theorums, with amperage, voltage drop, resistance etc, a mechanical benefit to the engine yes

 

[buddy]

Never been a doubt that its the best thing since the remote FSD.

I'd really like to learn more about the scavenging on the 6.5 or any IDI engine if anyone has any references. So we can make better calculations. I would prefer to have no overlap if anyone can fab a crank for that.

 

[ak diesel driver]

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So after my head kools down, are we all in agreement that there is a gain, and that given an unofficial reporting we can speculate with some certainty that the ATT A-Team Turbo is a plus for our motor???

Don't think there was ever any ? about whether or not the ateam turbo was a good set up. Mostly just wanted some clarity as to what all is affected and why things are effected as they are.

 

[Slim Shady]

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So after my head kools down, are we all in agreement that there is a gain, and that given an unofficial reporting we can speculate with some certainty that the ATT A-Team Turbo is a plus for our motor???

Don't think there was ever any ? about whether or not the ateam turbo was a good set up. Mostly just wanted some clarity as to what all is affected and why things are effected as they are.

I didn't do any math just looked things over and looked at other motors and how they functioned under load to no load. Figured an industrial motor loads and unloads more than any truck so started looking at how the industrial guys did it. Also looked at the RX-7 guys because the rotary motor makes more exhaust than most gassers, and scavenging on the rotary exhaust is paramount to making power. Just rattled it around in the empty space up there and kind of did a look see at what may work. Then read up on inducer,and exducer sizes how they affect the turbine wheel and how larger wheels take more drive pressure to work and clipped wheels make more boost with less drive pressure and so on. Then took a leap of faith when I saw the Mitsubishi Turbo and the dual scroll, humm just like a garden hose equal pressure smaller inlet higher velocity,spin it up faster then large side will take over at higher exhaust, sounded good but it was a hunch.

When I put it on, the first drive was odd, the truck ran much smoother and didn't drive much different as far as turbo performance, but the exhaust sounded much more throaty than it did before, the rest is history. Changed the compressor wheel slightly and the ATT turbo is the result. A few trips to NC, and a few more miles to the gallon of diesel and I knew it was a good turbo, hard part was getting anyone to beleive in it, enter Turbine Doc, Hank1948 for machining and we have our turbo. And it doesn't cost 2100 dollars like some other 6.5 performance turbos.

Wasn't in it for the money, just wanted to pay myself back and make a few dollars to have some spending money, not get rich. Thats not a crime last time I checked, but sure taken some heat at some other forums. :thumbsup:

 

[NVW]

It was a good hunch Slim:thumbsup:

Leo​

 

[ercaduceus]

When I read this I keep picturing the bear in your avatar talking. ):h Must be 70's or 80's flash backs. :sifone:

I thought it was just me Seems I always do that. Buddy is a talking camaro. I think I might be retarded.

 

[ercaduceus]

So if we were to use the belt driven turbo and have 0 or close to 0 backpressure we wouldn't have to run as much boost to see a comparable gain .

Is a belt driven turbo the same as a centrifugal supercharger?

 

[ak diesel driver]

Not sure there are alot of different terminologies out there. I simply meant one that looked like a turbo but belt driven.

 

[buddy]

I thought it was just me Seems I always do that. Buddy is a talking camaro. I think I might be retarded.

Maybe you should get a camaro, then you might not be so retarded ):h

Ive lost brain cells since I stopped driving mine, I need to do some serious T/S on it, hasnt been the same since some marmots chewed up a bunch of wiring. The truck runs perfect and gets better mileage so I just drive it.

 

[ercaduceus]

You guys are a bit ahead of me. I take from this thread that the ATT is better than the GM-X because...

There is less back-pressure on the exhaust side which allows the cylinder to empty more quickly and completely thus allowing more fresh air in. With the decrease in back pressure there is less stress on the motor. Therefore the motor and the turbo don't have to work as hard for the same performance requirement. The decreased work load on the turbo and the altered compressor decreases heat which saves energy loss to heat. Am I following correctly?

 

[ercaduceus]

Maybe you should get a camaro, then you might not be so retarded ):h

Ive lost brain cells since I stopped driving mine, I need to do some serious T/S on it, hasnt been the same since some marmots chewed up a bunch of wiring. The truck runs perfect and gets better mileage so I just drive it.

Does a black 86 fire-chicken with a seized V6 count):h. It even has the Knight rider light thingy on the front (bought it like that). Someday i'll get it runnin. Probably after I return from my space shuttle flight to mars

 

[buddy]

It doesnt empty the exhaust from the cylider more quicky but it compresses the exhaust left in the cylinder less (lower backpressure), therefore the exhaust left in the cylinder expands less on the intake stroke, so there is a little bit more air/oxygen getting in to mix with the fuel. additionally, because the turbo operates more efficiently the lower backpressure does not translate as much heat to the intake, so the intake air is more dense (more mass per cubic foot) with more oxygen to complete the fuel combustion.

And youre right, less backpressure reduces the cylinders resistance, so less wasted energy. all makes for more power and efficiency at lower/safer operating conditions.

Its also better because it costs the same as a GM-X, and you dont need an intercooler, so saves you all sorts of money.

 

[buddy]

Does a black 86 fire-chicken with a seized V6 count):h. It even has the Knight rider light thingy on the front (bought it like that). Someday i'll get it runnin. Probably after I return from my space shuttle flight to mars

No that doesnt count unless you drop a 350 in it, which was rare in that year. I had an 86 camaro with 2.8L V6, my first car, which I replaced the enigne and rebuilt the 700R4 tranny myself once and I dont know why I put another 2.8 in, probably becuase it was cheap and my first year in college with no job.

 

[ercaduceus]

No that doesnt count unless you drop a 350 in it, which was rare in that year. I had an 86 camaro with 2.8L V6, my first car, which I replaced the enigne and rebuilt the 700R4 tranny myself once and I dont know why I put another 2.8 in, probably becuase it was cheap and my first year in college with no job.

I have a 355 SBC for it. Just never seem to have time.

 

[ercaduceus]

Thanks, I think i'm learning. Shhh!! Don't tell anyone.
If this is a bigger turbo, why does it not have lag?

 

[Slim Shady]

Thanks, I think i'm learning. Shhh!! Don't tell anyone.
If this is a bigger turbo, why does it not have lag?

Because of the combination of turbine wheel, compressor wheel, and housing design. I wasn't stuck on PSI just efficiency. :thumbsup:

 

[ercaduceus]

Slim. I notice you have an 18.1 motor. Does it make a noticable difference running the ATT with lower compression? With 18.1 should you up the boost to make up for the drop in compression? I guess that would take a design change to the ATT since there is no wastegate. What compression would work best with this turbo?