kinda a twin turbo

MidnightBlade

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well just spent a whole night studying that thread and finally got some idea ofwhat it is all about. so accoding to your post, the T40B with a 62-1 compressor would be ideal for parallel turbos running 20 PSI of boost?
 

429idi

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two t04b's? Holy crap!:eek: That's more than 120lbs/min. max, that's almost twice what an hx40 will flow (depending on the model). Seems like that would be a better single.
 

82F100SWB

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The ATS/factory wastegated turbos are about the right size for a parallel twin setup compressor wise, single, they are already heading off the map at 12 psi. For a single, a 62-1 would be a decent charger, but, for much in excess of 18 psi, it's still on the small side. These are big engines, and need big chargers.
 

429idi

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The ATS/factory wastegated turbos are about the right size for a parallel twin setup compressor wise, single, they are already heading off the map at 12 psi. For a single, a 62-1 would be a decent charger, but, for much in excess of 18 psi, it's still on the small side. These are big engines, and need big chargers.

I have never been able to find a map of any ats turbo. Are you comparing wheel sizes to similar maps, or do you have one? I'd be interested to see one if you have it. The non gated ats I had had a 70 trim wheel.

The 62-1 would make about 18psi if you are figuring 75 degree iat. Most of us aren't luck enough to have temperatures that low. I usually figure 130 degrees for an air/air intercooler, and that would get us 21psi. Non-intercooled I usually figure 200 degrees which would be around 25psi. to flow the same amount of air. Some no cooled setups will run in excess of 300 degrees.
 
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MUDKICKR

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what about the turbo from a 92 mitz eclipse? its a tdo5h, would 2 of those make a good twin turbo system for a 7.3?
 

429idi

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what about the turbo from a 92 mitz eclipse? its a tdo5h, would 2 of those make a good twin turbo system for a 7.3?

Which version is the tdo5? I'm only finding a tdo4 came on the 92 eclipse. It also depends on how much boost you want to run. Are you doing it for towing, or max hp? If you are using them for towing, I wouldn't figure them for 3750 rpm if you aren't going to be revving there a lot.

I betcha DYoungs turbo was 400+ degrees at 28psi

Ya man, I got my money on 500. Probably doesn't flow any more air then at 20psi. I would have liked to see the drive pressure.LOL
 

mabc926

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429idi, I found some videos on youtube with the user name "429idi" I'm guessing that's your truck?


And if so, holy crap! That turbo sounds bad ass!

Way louder than mine, could be the stacks though.
 

MidnightBlade

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Which version is the tdo5? I'm only finding a tdo4 came on the 92 eclipse. It also depends on how much boost you want to run. Are you doing it for towing, or max hp? If you are using them for towing, I wouldn't figure them for 3750 rpm if you aren't going to be revving there a lot.

yea i will be using it for mostly as a DD and for some towing 5-6K at around a 7% grade
 

MUDKICKR

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Which version is the tdo5? I'm only finding a tdo4 came on the 92 eclipse. It also depends on how much boost you want to run. Are you doing it for towing, or max hp? If you are using them for towing, I wouldn't figure them for 3750 rpm if you aren't going to be revving there a lot.



Ya man, I got my money on 500. Probably doesn't flow any more air then at 20psi. I would have liked to see the drive pressure.LOL

reg tdo5h, the tdo4 came on the autos, the tho5h came on the 5-speeds. the engines i removed these from were the cyclone engines, but the turbos from them are the same as factory 5-speed cars. if you want, try the "Plymouth laser"
its going to be my daily driver, and it will be towing a 5th wheel toyhauler to and from the racetracks i race at. lots of hills here since this is WV, but i figure Barber or Daytona will be about as far as i tow.
 

429idi

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429idi, I found some videos on youtube with the user name "429idi" I'm guessing that's your truck?


And if so, holy crap! That turbo sounds bad ass!

Way louder than mine, could be the stacks though.

Thanks, it's good to know somebody else likes it.The stacks actually quieted it down.

yea i will be using it for mostly as a DD and for some towing 5-6K at around a 7% grade

If it were my truck, I would figure it for 3300rpm max.

Here is the equation I use for the preliminaries when choosing a turbo.


Wa= (MAP x VD x N/2 x VE) / (R x (460+Tm))

· Wa = Airflowactual (lb/min)
· MAP = Manifold Absolute Pressure (psia) =
· R = Gas Constant = 639.6
· Tm = Intake Manifold Temperature (degrees F) =
· VE = Volumetric Efficiency =
· N = Engine speed (RPM) =
· Vd = engine displacement in Cubic Inches

Lets say you wanted to run 15psi of boost at 3300rpm, intercooled, with 85% ve, on a 7.3 (444cid engine).

so,

wa= ((13.7+15) x 444 x (3300/2) x .85) / ( 639.6 x (460+130)) = 47.4lbs/min at a p/r of 2.09. So each turbo needs to be able to flow 24lbs/min, at a p/r of 2.09.

A garrett t-3 50 trim is what I would choose for that.

For 20 psi

wa=((13.5+20) x 444 x (3300/2) x .85) / (639.6 x (460+130))= 55.6lbs/min at 2.45 p/r. Each turbo needs to flow 25.3lbs/min at a 2.45 p/r.

I would also choose two garrett t-3 50 trim turbos for that

for 30psi boost

wa= ((13.7+30) x 444 x (3300/2) x .85) / (639.6 x (460+130))= 72lbs/min each turbo will do 36lbs/min at a 3.18 p/r

for that we will have to step up to two t04e 46 trim turbos.


The math 82F100 was using is probably better for your final turbo choice.

I'll do the same scenarios with a 6.9 (420)

wa= ((13.7+15) x 420 x (3300/2) x .85) / ( 639.6 x (460+130))= 44.7lbs/min
wa= ((13.7+20) x 420 x (3300/2) x .85) / ( 639.6 x (460+130))= 52.6lbs/min
wa= ((13.7+30) x 420 x (3300/2) x .85) / ( 639.6 x (460+130))= 68.2lbs/min

I would use a t-3 45 trim for the top, t3 50 trim for the middle, and you could probably get away with two 40 trim t04e's, but I would use the 46 trims.

I wouldn't use td04's myself since they have a t25 turbine.
The td05 would kind of work, but the maps look a little mis-matched to our motors. I found one map that would work around 25psi of boost, I'll have to keep looking.

I hope all my math is correct, I've been staring at the computer too long, I've got to get out of the house.
 

racer30

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Hey 429 ... have you had your truck on rollers? and what cam are you running in your engine? ..just wondering...
 
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