Dyno day for me...
Thread Starter
Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
Dyno day for me...
I've been curious, now I know.
221.9 RWHP... I suppose it's not bad, but a guy always wants it to be about 5,613,617,317,387.81
350, roller cam (I lost the damn cam specs), roller rockers, flat tops, Dart Iron eagle platinum heads (64 CC, 2.02 intake, 1.6 ex), Holley 650 spread bore, dual plane intake, ram horns, 2" pipes - no cats, 4 speed....
click to enlarge.
I found the torque curve (or lack of) interesting, and good imo..
this is off teh second run which was a little less than the first, but nearly the same.
what do ya'll think?
221.9 RWHP... I suppose it's not bad, but a guy always wants it to be about 5,613,617,317,387.81
350, roller cam (I lost the damn cam specs), roller rockers, flat tops, Dart Iron eagle platinum heads (64 CC, 2.02 intake, 1.6 ex), Holley 650 spread bore, dual plane intake, ram horns, 2" pipes - no cats, 4 speed....
click to enlarge.
I found the torque curve (or lack of) interesting, and good imo..
this is off teh second run which was a little less than the first, but nearly the same.
what do ya'll think?
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
Any guesses on the cam spec (lift, at least) and CR?
If you figure around 260HP at the flywheel I'm not sure it's WAY off if it's a mild cam and 8.5 CR or so...
MotorHead, what are you thinking the combo should see?
If you figure around 260HP at the flywheel I'm not sure it's WAY off if it's a mild cam and 8.5 CR or so...
MotorHead, what are you thinking the combo should see?
Pro
Joined: Aug 2005
Posts: 704
Likes: 2
From: Cincinnati OH
Generally by 15%.there can be some difference in this number because it depends how they set it up the day you are there. they entered your car weight right? do you know it exactly or did you estimate. it makes a difference on a mustnag dyno because they "load" the car on the rollers to this number for resistance purposes. Things like that plus number of other real world settings for the mustang dyno. I believe they also use a different standard pressure and temperature than other dyno people.
Pro
Joined: Aug 2005
Posts: 704
Likes: 2
From: Cincinnati OH
I found the torque curve (or lack of) interesting, and good imo..
this is off teh second run which was a little less than the first, but nearly the same.
what do ya'll think?[/QUOTE]
Did they do air:Fuel ratios during the run? Those would help. looks like you're losing power in the lower range...right where you'd feel it in the seat gage!
It also looks like there's still more to be had at 5500 rpm. getting close but the curve is still climbing. why'd you stop early?
this is off teh second run which was a little less than the first, but nearly the same.
what do ya'll think?[/QUOTE]
Did they do air:Fuel ratios during the run? Those would help. looks like you're losing power in the lower range...right where you'd feel it in the seat gage!
It also looks like there's still more to be had at 5500 rpm. getting close but the curve is still climbing. why'd you stop early?
Last edited by TheMongoose; Aug 17, 2007 at 06:36 PM. Reason: thought of something else to say
Thread Starter
Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
I'll dig around for the cam spec, I know I have it here somewhere on the reciept - but it's not a puss cam.
we did estimate the weight (3650)
Did they do air:Fuel ratios during the run? Those would help. looks like you're losing power in the lower range...right where you'd feel it in the seat gage!
It also looks like there's still more to be had at 5500 rpm. getting close but the curve is still climbing. why'd you stop early?
No fuel air ratios and I didn't get to drive it, some shop dude did.
Generally by 15%.there can be some difference in this number because it depends how they set it up the day you are there. they entered your car weight right? do you know it exactly or did you estimate. it makes a difference on a mustnag dyno because they "load" the car on the rollers to this number for resistance purposes. Things like that plus number of other real world settings for the mustang dyno. I believe they also use a different standard pressure and temperature than other dyno people.
Did they do air:Fuel ratios during the run? Those would help. looks like you're losing power in the lower range...right where you'd feel it in the seat gage!
It also looks like there's still more to be had at 5500 rpm. getting close but the curve is still climbing. why'd you stop early?
Thread Starter
Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
when we compared my specs to crate engines, we figured we had about 400 or a little more at the flywheel so I was a little surprised.
the car does run pretty decently....
the car does run pretty decently....
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
I believe that it’s a comp magnum – advertised duration intake and exhaust = 280, lift at .480 or at least it’s pretty close to that (I almost did a .502/.510 lift and went the next size down.)... I’ll keep digging.
Thread Starter
Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
it is a roller cam, roller rockers as well.
and yes, the exhaust does suck the big one...
i expected more, the car runs excellent, starts perfectly. I know my timing and shet are right...
and yes, the exhaust does suck the big one...
i expected more, the car runs excellent, starts perfectly. I know my timing and shet are right...
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Something wrong with that dyno.
HP = (torque x rpm)/5252. So at 5252rpm quess what? Yep torque = hp. Some how your motor has torque = rpm at 'bout 4400rpm!
Find a dyno that works myfriend. Someone don't know how to run to run a dyno or has a bad one as those graphs and number are worthless.
Sorry for the bad news but maybe you really have more power. My quess u should have 300hp & ft-lbs at the wheels.
cardo0
Find a dyno that works myfriend. Someone don't know how to run to run a dyno or has a bad one as those graphs and number are worthless.
Sorry for the bad news but maybe you really have more power. My quess u should have 300hp & ft-lbs at the wheels.
cardo0
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
.480's not a huge cam, especially for a roller. And yes...the exhaust ain't great - especially the 2" pipe. 1HP/CID at the flywheel is certainly within reason with that cam, still makes for about 290 or so at the rear...
Thread Starter
Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
HP = (torque x rpm)/5252. So at 5252rpm quess what? Yep torque = hp. Some how your motor has torque = rpm at 'bout 4400rpm!
Find a dyno that works myfriend. Someone don't know how to run to run a dyno or has a bad one as those graphs and number are worthless.
Sorry for the bad news but maybe you really have more power. My quess u should have 300hp & ft-lbs at the wheels.
cardo0
Find a dyno that works myfriend. Someone don't know how to run to run a dyno or has a bad one as those graphs and number are worthless.
Sorry for the bad news but maybe you really have more power. My quess u should have 300hp & ft-lbs at the wheels.
cardo0
That would be hard to take...
Le Mans Master
Joined: Jul 2005
Posts: 5,752
Likes: 4
From: Austin Texas
HP = (torque x rpm)/5252. So at 5252rpm quess what? Yep torque = hp. Some how your motor has torque = rpm at 'bout 4400rpm!
Find a dyno that works myfriend. Someone don't know how to run to run a dyno or has a bad one as those graphs and number are worthless.
Sorry for the bad news but maybe you really have more power. My quess u should have 300hp & ft-lbs at the wheels.
cardo0
Find a dyno that works myfriend. Someone don't know how to run to run a dyno or has a bad one as those graphs and number are worthless.
Sorry for the bad news but maybe you really have more power. My quess u should have 300hp & ft-lbs at the wheels.
cardo0
Thread Starter
Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Again HP = (torque x rpm)/5252. Thats it.
The engine torque may vary at different rpm and may not increase at a linear rate. But the truth is that at every rpm the HP is = (torque x rpm)/5252 and should be plotted as so. If u cannot understand that i cannot help you. HP is only a mathmatical relationship to torque at a specific rpm - lets not make it confusing like HP is some escoteric knowlege. Just do the math.cardo0
Race Director
Joined: Sep 2002
Posts: 10,362
Likes: 5
From: San Diego - Deep Within The State of CONFUSION!
Did they just do a HP test, or did they dyno tune it? Our engines sound similar except for the heads. I'm running 275 RWHP and I've still got the cast iron heads!
Le Mans Master
Joined: Jul 2005
Posts: 5,752
Likes: 4
From: Austin Texas
Non-linear? What do u mean? That graph only goes to 4966rpm where HP is = 220 and torque is already <160. If that graph did go to 5252rpm the difference would only get worse.
Again HP = (torque x rpm)/5252. Thats it. The engine torque may vary at different rpm and may not increase at a linear rate. But the truth is that at every rpm the HP is = (torque x rpm)/5252 and should be plotted as so. If u cannot understand that i cannot help you. HP is only a mathmatical relationship to torque at a specific rpm - lets not make it confusing like HP is some escoteric knowlege. Just do the math.
cardo0
Again HP = (torque x rpm)/5252. Thats it.
The engine torque may vary at different rpm and may not increase at a linear rate. But the truth is that at every rpm the HP is = (torque x rpm)/5252 and should be plotted as so. If u cannot understand that i cannot help you. HP is only a mathmatical relationship to torque at a specific rpm - lets not make it confusing like HP is some escoteric knowlege. Just do the math.cardo0