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 Turbo Output
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the.planetary.gear

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6 posts
1989 (08/88 no bullshit) Nissan 240sx S13 Fastback, 1990 Nissan 240sx S13 Fastback, 1990 Mazda RX-7
Panama City Florida
6-24-2008

  Turbo Output 7:04 AM 7/16/2008

Is there a way to know how many pounds per minute of air a turbocharger will output? I was told that my T25 can pump 22 pounds per minute of air. It was explained to me that a turbocharger can support 10 horsepower for every pound per minute of air that it outputs. According to this information my T25 can support 220 horsepower roughly which seems about right for such a small turbocharger. I want to get a turbocharger that will pump a greater number of pounds per minute of air, however I don't know how to find that information while shopping for my new turbo.
WDRacing
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14627 posts
1995 240SX, K5 Blazer
USA
11-25-2002

 « Re: Turbo Output (the.planetary.gear) 7:09 AM 7/16/2008

Where are you shopping? Most places list the cfm, unless it's ebay. Unless you're getting a GT series turbo, then a t25 is to small for the KA.
neverlift
brain fart



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PIGNOSE #19 turbo piggy
sunshinestate
4-24-2006

 « Re: Turbo Output (WDRacing) 7:38 AM 7/16/2008

yeah most turbo sites have the specs of the turbo....

a t25 ist too small wd, its more like its range is too small.
I loved the t25 setup, and already miss the early onset of boost. Dont get me wrong the t3 at half the boost owns the t25, BUT now waiting for boost while trying to drift is ghey, glad I can dew eet without hitting boost it kills my freind how a car with no power just wants to drift... he has an sr @15psi lol

also I get a hint off others with t3 that its hindering the speeds on a shorter track(auto x/ road race)




PIGNOSE SQUAD MEMBER # 19

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09/01/89~09/28/06

WDRacing
Super Grumpy Moderator



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14627 posts
1995 240SX, K5 Blazer
USA
11-25-2002

 « Re: Turbo Output (neverlift) 8:16 AM 7/16/2008

If you never want to increase the power beyond 180-200 whp then a T25 is fine I suppose. But if you want more power then it IS a restriction...period. Unless like I said, you're using a GT series turbo. But again, I'll use the T3/TO4 over the GT any day of the week and twice on Sunday. And I can buy anything I want with the left over $800 bucks...

Are you drifting at 2500 rpm? I don't see how your not in boost bro. This "waiting" for boost thing could be remedied with simply driving in a lower gear.

WD
the.planetary.gear

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6 posts
1989 (08/88 no bullshit) Nissan 240sx S13 Fastback, 1990 Nissan 240sx S13 Fastback, 1990 Mazda RX-7
Panama City Florida
6-24-2008

 « Re: Turbo Output (WDRacing) 12:26 PM 7/16/2008

Thanks for the information guys. Do you know how to convert Cubic Feet per Minute to Pounds per Minute? Or do you know how much horsepower is supported for every Cubic Foot per Minute? I'm building the crap out of the engine so that I can start with a low boost T25 set up but when I'm ready for more speed and power I'll know the engine is going to hold together. I just want to know what gains a certain turbocharger will give me over another.
C-Kwik
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7028 posts
2004 Nissan Titan LE Crew Cab, 2005 Honda CBR600 F4i
SoCal CA
8-2-2002

 «  4:25 PM 7/16/2008

The maximum rated flow rate for a turbo is not an accurate way of determining how much power a turbo is to map it out on the compressor map. The peak airflow for a given turbo happens at a specific amount of boost pressure and would have to assume the motor will be able to flow that much at that boost pressure. When using a relatively large turbo on a smaller motor will generally result in a motor that will hit redline before it can pump that much air at that boost pressure.


"Bad Driver's Famous Last Words:
Watch This!
nissanfanatic

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1314 posts
1992 Nissan 240sx SE
Gainesville Fl
11-1-2004

 « Re: Turbo Output (the.planetary.gear) 4:37 PM 7/16/2008

Quote, originally posted by the.planetary.gear »
Thanks for the information guys. Do you know how to convert Cubic Feet per Minute to Pounds per Minute? Or do you know how much horsepower is supported for every Cubic Foot per Minute? I'm building the crap out of the engine so that I can start with a low boost T25 set up but when I'm ready for more speed and power I'll know the engine is going to hold together. I just want to know what gains a certain turbocharger will give me over another.

CFM * .069=airlfow in Lb/min
(lbs/min)/.069=airflow in CFM


-Cory
Street racing fatalities: 0.21% of total fatalities in motor vehicle crashes.
FTC

1992 Nissan 240sx KA24DE-Turbo: The "Showcar"
Stock internals
532whp/486ft.lbs-30psi
12.6@122.3mph-22psi
http://ka-t.org/cory_b.php
 

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