torque gains - ZR-1 Net Registry Forums

Kevin · 12-15-2011

I was looking at marc's site the other day to get a price on a 415 package, not that I'm considering it, i was looking it for an email on the list serv. and I saw that he has listed hp gains for porting, headers, exhaust, ect but not torque gains. does anyone have any ideas for what the torque gains are?

tomtom72 · 12-16-2011

I would think that you could get a feel for the T/Q gains from all the dyno sheets posted by the guys that have had various types of work done. Dominic comes to mind instantly as he posts some very interesting charts.

Generally I would offer this thought. The bigger the explosion, the more T/Q one would see to a limit. So a P&P job would be going in that general direction. However, T/Q is also influenced by how big the piston is, so bigger = more T/Q. Also along the same thought pattern, the longer the con rod the more the T/Q as it's a longer lever with which to do work. Those are my thoughts, JMHO.

Tom

Kevin · 12-16-2011

Quote:

Originally Posted by tomtom72

I would think that you could get a feel for the T/Q gains from all the dyno sheets posted by the guys that have had various types of work done. Dominic comes to mind instantly as he posts some very interesting charts.

Generally I would offer this thought. The bigger the explosion, the more T/Q one would see to a limit. So a P&P job would be going in that general direction. However, T/Q is also influenced by how big the piston is, so bigger = more T/Q. Also along the same thought pattern, the longer the con rod the more the T/Q as it's a longer lever with which to do work. Those are my thoughts, JMHO.

Tom

more coffee is needed before I can even begin to figure out this post.

1990 quasar blue · 12-17-2011

See Kevin......... nothing to it...............right?

Kevin · 12-17-2011

i'm going to go cry in the corner now

tf95ZR1 · 12-17-2011

Easy:

Torque (& HP) =

$$$

Paul Workman · 12-18-2011

The lines are kinda faint, but if you can make them out, here are some graphs to compare one of Marc's 415s to a "500" packaged 350 and a stock 90.

Compare one of Marc's 415s to a stock 350 with and without a "500" package 350:

The 415-

The "500" build-

The stock (90) w/ a Borla cat-back.

No replacement for displacement, as the saying goes! the 415 makes approx 27% more torque at 5000 and generally across the rpm range over a "500" package 350, and something like 46% more over a stock (90) at 5k rpm.

Hope this helps.

XfireZ51 · 12-18-2011

Pretty lousy fuel curve on the stock motor!

Kevin · 12-18-2011

paul,
thanks for the graphs but it's not really what I was looking for. as I said, on marcs site he has a break down of porting adds x hp, headers add y hp, flywheel adds z hp, I was wondering if there was a corresponding break down for torque gains

XfireZ51 · 12-18-2011

Kevin,

If you look at some of the sigs on the forum, you'll see as an example
3 5.7L motors in various stages of modification.

Pete 474hp/400tq Ported top end, heads and 242 cams + exhaust
Paul 432hp/377tq Ported top end and heads, + exhaust, stk cams
Dominic 430hp/385tq Ported top end and GVD heads,+exhaust,236 cams
Dominic 399hp/359tq Ported top end + exhaust, stk cams

Recently, Marc H had a 5.7L, stock cam/ported motor at 348hp.

Sure looks like the stock motor was "choked" coming from the factory. Imagine the furor a 5.7L putting out over 500chp
would have caused back in 1990!
All power and tq is quoted as rw here.

12-15-2011	#1
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,632	torque gains I was looking at marc's site the other day to get a price on a 415 package, not that I'm considering it, i was looking it for an email on the list serv. and I saw that he has listed hp gains for porting, headers, exhaust, ect but not torque gains. does anyone have any ideas for what the torque gains are? __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

12-16-2011	#2
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: torque gains I would think that you could get a feel for the T/Q gains from all the dyno sheets posted by the guys that have had various types of work done. Dominic comes to mind instantly as he posts some very interesting charts. Generally I would offer this thought. The bigger the explosion, the more T/Q one would see to a limit. So a P&P job would be going in that general direction. However, T/Q is also influenced by how big the piston is, so bigger = more T/Q. Also along the same thought pattern, the longer the con rod the more the T/Q as it's a longer lever with which to do work. Those are my thoughts, JMHO. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

12-17-2011	#4
1990 quasar blue Join Date: Feb 2004 Location: Ma Posts: 404	Re: torque gains See Kevin......... nothing to it...............right? __________________ 1990 ZR1 #2574 Medium Quasar Blue Metallic 1 of 19

12-17-2011	#5
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,632	Re: torque gains i'm going to go cry in the corner now __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

12-17-2011	#6
tf95ZR1 Join Date: Aug 2005 Location: Northridge, CA Posts: 1,461	Re: torque gains Easy: Torque (& HP) = $$$

12-18-2011	#7
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,493	Torque: No replacement for displacement!! The lines are kinda faint, but if you can make them out, here are some graphs to compare one of Marc's 415s to a "500" packaged 350 and a stock 90. Compare one of Marc's 415s to a stock 350 with and without a "500" package 350: The 415- The "500" build- The stock (90) w/ a Borla cat-back. No replacement for displacement, as the saying goes! the 415 makes approx 27% more torque at 5000 and generally across the rpm range over a "500" package 350, and something like 46% more over a stock (90) at 5k rpm. Hope this helps. __________________ Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry

12-18-2011	#8
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: torque gains Pretty lousy fuel curve on the stock motor!

12-18-2011	#9
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,632	Re: torque gains paul, thanks for the graphs but it's not really what I was looking for. as I said, on marcs site he has a break down of porting adds x hp, headers add y hp, flywheel adds z hp, I was wondering if there was a corresponding break down for torque gains __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

12-18-2011	#10
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: torque gains Kevin, If you look at some of the sigs on the forum, you'll see as an example 3 5.7L motors in various stages of modification. Pete 474hp/400tq Ported top end, heads and 242 cams + exhaust Paul 432hp/377tq Ported top end and heads, + exhaust, stk cams Dominic 430hp/385tq Ported top end and GVD heads,+exhaust,236 cams Dominic 399hp/359tq Ported top end + exhaust, stk cams Recently, Marc H had a 5.7L, stock cam/ported motor at 348hp. Sure looks like the stock motor was "choked" coming from the factory. Imagine the furor a 5.7L putting out over 500chp would have caused back in 1990! All power and tq is quoted as rw here. Last edited by XfireZ51; 12-18-2011 at 01:58 PM.