Thinking of swapping to HSR, keep same heads/cam?
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From: Buford, GA
Car: 89 RS
Engine: 6.3L Megasquirted HSR
Transmission: T56
Axle/Gears: 3.70 Posi 9 bolt
Thinking of swapping to HSR, keep same heads/cam?
In all honesty, Ive never felt safe driving a carbeurated car, or at least Ive never had good experience with them. Either way, I want fuel injection for my 383, be it for dependability or tuning capability (I know you can do the same to carbeurators, but its not as easy as using a laptop). That being said, Ive been pondering the idea of taking off my intake and Holley 800 and piece by piece buying a HSR. Could I still make decent numbers with the HSR while keeping my long block the same (specs in sig)?
Joined: Apr 2006
Posts: 1,534
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From: Jacksonville, NC
Car: 92 Camaro
Engine: Dart SHP 406 HSR, LE heads
Transmission: Performabuilt Level 2, Vig 3200
Axle/Gears: S60 373
Re: Thinking of swapping to HSR, keep same heads/cam?
i tihnk you should be good....i believe there is another member running that cam and put down 320/355 on a mustang dyno...and those read lower than a dyno jet
Joined: Sep 2003
Posts: 25,895
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From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: Thinking of swapping to HSR, keep same heads/cam?
i dont see why you shouldnt run just as good as long as it is tuned.... thats the big thing. 110 lsa isnt generally a great choice for EFI tuning but it has and can be done just takes more time to perfect the tune.
HSR flows pretty good so it should match a carbed manifolds performance
HSR flows pretty good so it should match a carbed manifolds performance
Thread Starter
Senior Member
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Joined: Nov 2004
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From: Buford, GA
Car: 89 RS
Engine: 6.3L Megasquirted HSR
Transmission: T56
Axle/Gears: 3.70 Posi 9 bolt
Re: Thinking of swapping to HSR, keep same heads/cam?
Is it true that manual cars put down almost all flywheel hp, as compared to auto cars putting down like 70% or so? Like let's say my 383 as of now puts out 400 fwhp, is it possible for me to get 390rwhp?
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: Thinking of swapping to HSR, keep same heads/cam?
manuals do tend to put down more power than autos just because of how the power is transfered thru the trans. it takes more "power" to turn auto transmission gears/clutches/bands etc than manual transmissions
typical figures are 15% loss with manuals and 20-25% with autos but some will argue it doesnt work like that
typical figures are 15% loss with manuals and 20-25% with autos but some will argue it doesnt work like that
Joined: Jul 1999
Posts: 12,088
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From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: Thinking of swapping to HSR, keep same heads/cam?
How much overlap does that came have? I ran a CC306, and it was a short nightmare to tune, but I finally got it right. (in open loop).
-- Joe
-- Joe
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Senior Member
iTrader: (9)
Joined: Nov 2004
Posts: 996
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From: Buford, GA
Car: 89 RS
Engine: 6.3L Megasquirted HSR
Transmission: T56
Axle/Gears: 3.70 Posi 9 bolt
Re: Thinking of swapping to HSR, keep same heads/cam?
Im not sure how to figure out overlap, but the figures are as follows:
230/236@ .050", .490"/.490" 110LSA
Advertise dur. was somewhere around 274
230/236@ .050", .490"/.490" 110LSA
Advertise dur. was somewhere around 274
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Joined: Jul 1999
Posts: 12,088
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: Thinking of swapping to HSR, keep same heads/cam?
Overlap is the same as my cc306 was.. You'll have fun tuning it. 
I think you'll get it eventually.
-- Joe

I think you'll get it eventually.
-- Joe
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: Thinking of swapping to HSR, keep same heads/cam?
it will like abit more LSA to keep overlap down for tuning purposes
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