Supercharger question (stealth)?
Re: Supercharger question (stealth)? Thanks for the responses. I was hoping to make mid 700's.
Cablebandit: I'm using the 2.75" pulley. I have never had any belt slipping problems. AT first I had the crank pulley spinning on the nose of the crank. But I had the crank keyed and have had no problems since.
Cablebandit: I'm using the 2.75" pulley. I have never had any belt slipping problems. AT first I had the crank pulley spinning on the nose of the crank. But I had the crank keyed and have had no problems since.
Re: Supercharger question (stealth)? Prostock john. I assume you got that number from Vortech's web site. It does say 825 hp for the t-trim. But if you look at the v-9 G-trim it says 575HP, Which is identical to what we put down with the g-tirm maxed out. 576RWHP.
Any thoughts on that?
Any thoughts on that?
TECH Enthusiast
Joined: Aug 2003
Posts: 596
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From: Downers Grove,IL
Re: Supercharger question (stealth)? 30thta436,
figure 1.4 cfm per hp at the CRANK for a rough estimate.
So 800cfm =571hp FLYWHEEL. 1200cfm=850hp FLYWHEEL.
You can use .069*Maf lbs/min for a ballpark cfm estimate also.
Vortechs numbers are conservative.
I am seeing over 67lbs/min which is at least 970cfm from my G-trim combo and somwhere around 690 crank hp.
Figure blower and drivetrain losses around 18% and that's about 575RWHP.
I would imagine if you over spun the t-trim it would exceed Vortechs posted flow number as well.
FYI, I am using a 2.5" blower pulley now.Big increase in midrange boost.
Steve
figure 1.4 cfm per hp at the CRANK for a rough estimate.
So 800cfm =571hp FLYWHEEL. 1200cfm=850hp FLYWHEEL.
You can use .069*Maf lbs/min for a ballpark cfm estimate also.
Vortechs numbers are conservative.
I am seeing over 67lbs/min which is at least 970cfm from my G-trim combo and somwhere around 690 crank hp.
Figure blower and drivetrain losses around 18% and that's about 575RWHP.
I would imagine if you over spun the t-trim it would exceed Vortechs posted flow number as well.
FYI, I am using a 2.5" blower pulley now.Big increase in midrange boost.
Steve
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Verdad Gallardo TECH Enthusiast
Joined: Aug 2003
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From: Downers Grove,IL
Re: Supercharger question (stealth)?
Vortech's numbers might be conservative for the G-trim, they admit that.
Have you actually had a conversation with somebody from Vortech about the G-trim?
TECH Enthusiast
Joined: Dec 2001
Posts: 553
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From: Columbia, MD
Re: Supercharger question (stealth)?
Have you actually had a conversation with somebody from Vortech about the G-trim?
TECH Enthusiast
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From: Downers Grove,IL
Re: Supercharger question (stealth)? I have taken my G-trim to 69,500rpm now.Risky? I am sure it is.
I have ported the blower outlet and inlet some also.
I am using a Mondo bypass AND a secondary throttle blade before the blower inlet.This is to elimininate as much load as possible from the blower when the throttle is shut.
It's evident the blower is maxed.I won't rev it any higher than this though.
The difference from a 2.85 to a 2.5 pulley was quite substantial.The 2.85 was operating the blower to around it's so called efficiency peak.
I plan on turning over 130mph with a stock 98 cam next year and the G-trim.
Steve
I have ported the blower outlet and inlet some also.
I am using a Mondo bypass AND a secondary throttle blade before the blower inlet.This is to elimininate as much load as possible from the blower when the throttle is shut.
It's evident the blower is maxed.I won't rev it any higher than this though.
The difference from a 2.85 to a 2.5 pulley was quite substantial.The 2.85 was operating the blower to around it's so called efficiency peak.
I plan on turning over 130mph with a stock 98 cam next year and the G-trim.
Steve
