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Old 01-16-2014, 05:34 PM   #36
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Originally Posted by Ish416 View Post
After thinking it over, I don't think the HX30 would be a good turbo. You would be pushing it to get the numbers you want.

The HX40 is found in the Cummins ISC engines (8.3L). These are typically in large Buses, RVs, Firetrucks, etc..

These turbos have been known to break 600hp with a bit left over. This turbo would be a bit much I think.

The HX35 from DSMtuners,

"The 8blade hx35 has a 56mm compressor inducer. This is found on 1995-1998 cummins manual pickups. The compressor flows 52 lb/min according to the compressor map.

The 7blade hx35 has a 56mm compressor inducer. This is found on the 1999-2002 cummins manual pickups. The compressor flows 60lb/min according to the compressor map and logged results from a member here. The stock hx35 12cm^2 twinscroll turbine housing is a t3 flange housing."


I would really suggest the HX35. I've been doing some math and it looks like the HX35 should be in the middle part of it's efficiency around 450hp at the crank on a 3.8L.

Stock, the 3.8L should need around 322 CFM @ 6,000 rpm with 80% volumetric efficiency.

For 450 at the crank, your engine will need to flow around 675 CFM.

That should give you a pressure ratio of around 2.0 - 2.3 maybe slightly more depending on losses, efficiency and such.

Looking at the compressor map for the HX35, it looks like the 3.8L could be almost perfect for that turbo, almost.
You're awesome. I really appreciate the time you took to do those calculations. From what I calculated, I would need about 29 lbs./min. at 2.3 pressure ratio to reach the 450 mark, which is around 524 cfm @ 250F, which is why I was a little skeptical of the size of the HX35, and I'm willing to bet it's because my guess was off. I'd be making a little more than 300 HP with only 29lbs./min. going in the hole, based-off you and this site I found on the topic. Clint's Garage: Holset HX35 Turbo Install If he's pushing just a little more than 400 HP with that thing, that's a good sign.
Again, my biggest concern is the hot-side. Diesel engines don't run a 12:1 or even 14:1 Air/Fuel ratio, it's around 20:1 and the rotational speed is very much different. While the mustang redlines at 5200 stock (and mine will redline @ 6k after changing the valve-train), most diesel engines redline at about 2300 or-so. So, with less than twice the air, and a little less than half the rotational speed (still four-stroke), I worry it's going to be too restrictive for WOT @ 6k, maybe at 5.2k, but... Iunno. Do you know something about the hotside on those, or a way to calculate what I need?
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Old 01-17-2014, 09:14 AM   #37
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I had a nice big post that had some maths and other things but when I went to post it, the website stopped working and it timed out. I tried pulling it back up but I got nothing.

So, instead of a long drawn out scientific response, I will keep this simple.

A turbo does not care what it is connected to. All the turbo cares about is air flow.

As far as air flow, the stock 24V Cummins that the HX35 comes on, flows around 43lb/min @ 3200 rpm and 18lbs boost. The 3.8L in your car should flow around 42lb/min @ 6000 and 12lbs of boost. That setup on your car should produce around 450hp at the crank under perfect conditions.

So as far as air flow is concerned, your car won't be much different to that turbo than the engine it came bolted to.

It will be different in that your car doesn't produce the same pressure that the Cummins does but your car will still be in the lower end of the efficiency range with that turbo.
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Old 01-17-2014, 09:56 AM   #38
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Quote:
Originally Posted by Ish416 View Post
I had a nice big post that had some maths and other things but when I went to post it, the website stopped working and it timed out. I tried pulling it back up but I got nothing.

So, instead of a long drawn out scientific response, I will keep this simple.

A turbo does not care what it is connected to. All the turbo cares about is air flow.

As far as air flow, the stock 24V Cummins that the HX35 comes on, flows around 43lb/min @ 3200 rpm and 18lbs boost. The 3.8L in your car should flow around 42lb/min @ 6000 and 12lbs of boost. That setup on your car should produce around 450hp at the crank under perfect conditions.

So as far as air flow is concerned, your car won't be much different to that turbo than the engine it came bolted to.

It will be different in that your car doesn't produce the same pressure that the Cummins does but your car will still be in the lower end of the efficiency range with that turbo.
I'm glad there is somebody on here who actually knows what the hell they're doing with this sort of stuff
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Old 01-17-2014, 01:18 PM   #39
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All of this from a guy with an "all motor" Camaro.

Who knew?

Nice job Ish!!! ...
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Old 01-17-2014, 04:37 PM   #40
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All of this from a guy with an "all motor" Camaro.

Who knew?

Nice job Ish!!! ...
The Camaro was actually going to be an LQ4 6.0L with a set of turbo's on it, around 600whp on low boost, around 800whp on full kill.

Until I let a friend drive the Talon and he blew it up doing 150+ MPH, kept downshifting wondering why it had lost power.

So now it's getting some money thrown at it. Already have a built 6 block that should be capable of 800 awhp. Sad thing, it likely won't ever see anything over 450awhp.

I'm trying to decide if I want to stay with my 16G or step up to an HX35.
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Old 01-18-2014, 11:21 AM   #41
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Originally Posted by Ish416 View Post
The Camaro was actually going to be an LQ4 6.0L with a set of turbo's on it, around 600whp on low boost, around 800whp on full kill.



Until I let a friend drive the Talon and he blew it up doing 150+ MPH, kept downshifting wondering why it had lost power.



So now it's getting some money thrown at it. Already have a built 6 block that should be capable of 800 awhp. Sad thing, it likely won't ever see anything over 450awhp.



I'm trying to decide if I want to stay with my 16G or step up to an HX35.

The camaro sounds like a beast man! Annd damn your friend -.- is he atleast helping with the rebuild?? I say step it up with the HX35! Hope everything works out for you lol
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