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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 07-23-2008, 07:43 PM   #1
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Here is the compressor map for a Garrett GT1544, a small turbo which fits easily into tight spaces:



It flows ~11 lb/min @ PR=2.25 at the very tip of the 75% island.


A Chevy LS6 engine displaces 350ci. Thus, at VE=85% and 6,000 RPM, it breathes 5.2 lb/min through each one of its cylinders, or at a PR of 2.25 it breathes 11.7 lb/min through each cylinder.


Discuss.
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Old 07-23-2008, 07:45 PM   #2
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So 8 of these turbos on an LS6 could produce no boost at 6000rpm efficiently?
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Old 07-23-2008, 07:47 PM   #3
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the turbine is only good to 6 lb/min
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Old 07-23-2008, 10:25 PM   #4
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Quote:
Originally Posted by Joe Perez View Post
Here is the compressor map for a Garrett GT1544, a small turbo which fits easily into tight spaces:

It flows ~11 lb/min @ PR=2.25 at the very tip of the 75% island.


A Chevy LS6 engine displaces 350ci. Thus, at VE=85% and 6,000 RPM, it breathes 5.2 lb/min through each one of its cylinders, or at a PR of 2.25 it breathes 11.7 lb/min through each cylinder.


Discuss.
Octacharged Pownage

It should run out of breath on a miata at around 4000 R.P.M. and 6 psi. The turbo is spinning out of control at 4500, and at 5000 it hand grenades.

Last edited by TravisR; 07-23-2008 at 10:57 PM.
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Old 07-23-2008, 11:45 PM   #5
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I have seen 8 turbos before, it was on a show car 57 belair.
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Old 07-24-2008, 09:33 AM   #6
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Do it!!! ~$500x8=one or two killer turbos that would work better and have a lot of change left over.

This 1544 is good if you're gonna turbo your oldass Ninja 500. If you were so inclined I'd sell you mine for about what you can find a chinese ebay special for

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the turbine is only good to 6 lb/min
Right. I don't know exactly how to interpret the info in a turbine map (one line?) but yeah, two of these on a 1800cc isn't a recipie for a lot of power, but maybe 8 on 5700cc would be a better match. I think the 1548 is a better choice though, water cooled too and not a larger footprint.
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Old 07-25-2008, 11:59 AM   #7
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Originally Posted by Saml01 View Post
I have seen 8 turbos before, it was on a show car 57 belair.
Yeah, I didn't care for that design. They collect all four cylinders' exhaust into a single log (and a rather poorly built one at that) then distribute it to all turbos equally, which are mounted in front of the engine. Pictures, for those who care: http://www.lateral-g.org/sandlin/

I want one turbo per cylinder, hanging directly off the head, in a nice front-to-back row.

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Do it!!! ~$500x8=one or two killer turbos that would work better and have a lot of change left over.
Well, yeah. There is that.

Then, there's also this: http://cgi.ebay.com/T15-Turbo-Turboc...QQcmdZViewItem. Apparently someone over at M.net did some research and found that, spec-wise, it's essentially a GT1548. (yes, I realize it's not the real ETD.)
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Old 07-25-2008, 12:48 PM   #8
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Quote:
Originally Posted by TurboTim View Post
Right. I don't know exactly how to interpret the info in a turbine map (one line?) but yeah, two of these on a 1800cc isn't a recipie for a lot of power, but maybe 8 on 5700cc would be a better match. I think the 1548 is a better choice though, water cooled too and not a larger footprint.

well...

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Originally Posted by myself
well let's see, join me in math world. That turbine should be at full capacity at 6 lb/min (converting to CFM using garrett's standards of 88* and 13.7psi atmospheric) that's about 86 CFM for that wheel to be spinning at it's max efficiency.

in math world a 1.6L can flow something around 85CFM or so close to 2500rpm.
at 7000rpm we'd be closer to 195CFM give or take 195/2 = 97.5CFM

probably why you saw gains when you went up to bigger ones, the exhaust was flowing more volume than the turbines could pass efficiently.....something to that matter :insert gain of salt:
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Old 07-25-2008, 01:10 PM   #9
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Thanks Scott

But I don't do math, ever.
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Old 07-25-2008, 01:17 PM   #10
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Quote:
Originally Posted by Joe Perez View Post
Then, there's also this: http://cgi.ebay.com/T15-Turbo-Turboc...QQcmdZViewItem. Apparently someone over at M.net did some research and found that, spec-wise, it's essentially a GT1548. (yes, I realize it's not the real ETD.)
Isn't that someone over at m.net our very own markp? if it truly is a chinese (or not?) GT1549, or close to it, then that's awesome. Pretty close to the GT1548 that I'm using now, x2, and on my dad's Suzuki Swift GT (1.3) x1. Works awesome on that car, works ok on mine too. Should work ok on his ninja500, without doing the math. Same for your LS6 I guess. I'm at lunch and it's friday. Both mean no math.

Do it, those ebay specials are cheap enough x8 to try if you don't mind eating it if it sucks. you can probably get me to do manifolds for "cheap" cause it'd be a unique project.

This is about the 8th time I've edited this...I keep adding stuff.
That 8turbo 57chevy "axcer8tor" or whatever I thought was a pretty cool idea when I first saw it, I was very interested. Then saw their pisspoor design, with the crap-ly designed log manifolds and such. Probably felt that simple was better/cheaper than doing it fancy. Oh well, I'm sure it did it's job of wow-ing the owner and the old carshow crowd types. And the dyno results were sad. I'm glad they posted a dyno video of it though.
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Old 07-26-2008, 12:32 PM   #11
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Quote:
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I have seen 8 turbos before, it was on a show car 57 belair.
I moved in with my Aunty and Uncle there.
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Old 07-26-2008, 04:20 PM   #12
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while entertaining, I too find nothing cool about how that is set up. definitely form>function here
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