Do Dyno Numbers really mean all That??
05-07-2009, 12:50 PM
#1
Do Dyno Numbers really mean all That?? Just as title says and what about racing and what is under the curve. I know there are a lot of factors, but True meaning of Horsepower and torque would be racing correct or not? Does anyone know what I am talking about?
05-07-2009, 01:49 PM
#3
Every dyno reads differently. The shop that I use has the lowest reading dyno around. If I want to compare my car to any other car, I can usually only compare it to other cars that have been on their dyno.
All the tracks are a 1/4 mile. The length never changes!
All the tracks are a 1/4 mile. The length never changes!
05-07-2009, 03:18 PM
#4
TECH Resident
iTrader: (3)
Join Date: Sep 2007
Location: Holmes County (thats right Amish Country), OHIO
Posts: 896
Likes: 0
Received 1 Like
on
1 Post
And different set up and transmissions and gears and everything will make a dyno read different. Overall settle it in a race. It measures driver skill and car power.
05-07-2009, 03:34 PM
#6
TECH Enthusiast
iTrader: (4)
Join Date: Jul 2008
Location: Oklahoma
Posts: 540
Likes: 0
Received 0 Likes
on
0 Posts
to me dyno numbers are for bragging rights, theres a 11sec car that dynoed 298rwhp and 289rwtq in a dyno thread i seen earlier today. its not the numbers that make a strong car, its the set-up
05-07-2009, 03:34 PM
#7
'area (or power) under the curve' is a better indication of the amount of power you have across the rpm band. while large 'peak' numbers can certainly be impressive, a higher average horsepower value will yield a faster vehicle, all else being equal.
Here's a good explanation:
Here's a good explanation:
To make this easier to grasp, consider that a horsepower rating tells you only what the engine is doing at a single point in the powerband. This is great for impressing potential customers, but it is a poor indication of the acceleration potential of the vehicle. The average horsepower throughout the operating range is what matters. The average horsepower is directly proportional to acceleration. A high average horsepower rating is the result of a wide powerband, or "Area under the curve."
www.yawpower.com
www.yawpower.com
Trending Topics
05-07-2009, 06:07 PM
#10
chances are that's a stalled auto on slicks/skinnies with a bunch of weight reduction. the stall actually takes away some power on the dyno, another reason dyno numbers don't mean everything.
05-07-2009, 06:11 PM
#11
Launching!
iTrader: (2)
Join Date: May 2008
Location: Acworth
Posts: 257
Likes: 0
Received 0 Likes
on
0 Posts
oh man i crack my self up hahaha
05-07-2009, 07:46 PM
#12
dyno numbers are very valuable data points. Very important for new, or modified engines. Not important for stock. Good dyno sessions are coupled with ECU management and continuous AFR readings. Single pull dynos just to see what the car makes is useless.
Critical areas where the dyno gives good info is AFR, and power band. You want to know where the torque slopes are, where you peak power occurs and drops off, and when to shift. You want too know if your engine is going to live, or blow a headgasket
Dyno also lets you know that your combination of go-fast parts may not be working to what you expected--- ie, the cam or valve train combination is not right, fuel injectors are to small, too little or too much fuel, timing is off, ECU program is not right, you have an electrical ground leak, or coil malfunction, air temp sensor is shot, water temp sensor is not working, o2 sensor is offline... These may not occur until 4000 rpm
If you just installed a bunch of Go-fast widgets on your car, or just put in a rebuilt motor, at least you want to make sure the combination of parts you put on is worth the money you just spent and is not actually hurting, nor that you were cheated on the deal.
Critical areas where the dyno gives good info is AFR, and power band. You want to know where the torque slopes are, where you peak power occurs and drops off, and when to shift. You want too know if your engine is going to live, or blow a headgasket
Dyno also lets you know that your combination of go-fast parts may not be working to what you expected--- ie, the cam or valve train combination is not right, fuel injectors are to small, too little or too much fuel, timing is off, ECU program is not right, you have an electrical ground leak, or coil malfunction, air temp sensor is shot, water temp sensor is not working, o2 sensor is offline... These may not occur until 4000 rpm
If you just installed a bunch of Go-fast widgets on your car, or just put in a rebuilt motor, at least you want to make sure the combination of parts you put on is worth the money you just spent and is not actually hurting, nor that you were cheated on the deal.
05-07-2009, 07:50 PM
#13
The rear end ratio make a huge difference. Car Weight, air temp, tire choice, gas octane, clutch and flywheel weight...all those intangibles. Skill/reflexes, knowing where ones optimal powerband is, and when to shift, can't be underestimated also.
05-07-2009, 08:06 PM
#16
On The Tree
Join Date: Jan 2009
Location: Sherwood OR
Posts: 127
Likes: 0
Received 0 Likes
on
0 Posts
The 1st dyno run on my Wife's 06 V6 Mustang with only an exhaust upgrade was 487rwhp. Now that's branging rights!
After the correct cal was put in it dropped to 206rwhp. Still pretty impressive for a 6 banger. She runs 14s (lots of wheel spin) in the 1/4.
After the correct cal was put in it dropped to 206rwhp. Still pretty impressive for a 6 banger. She runs 14s (lots of wheel spin) in the 1/4.
05-07-2009, 08:37 PM
#17
That makes no sense. Lets clarify: stock V6 with 500+ engine HP that drops more than half after a proper tune? Bragging about castration?
05-08-2009, 02:24 PM
#20
On The Tree
Join Date: Apr 2006
Location: Trenton NJ
Posts: 189
Likes: 0
Received 0 Likes
on
0 Posts
Dyno's like mentioned above are for tuning even for mods they aren't the best unless you are installing them at the shop and then strapping it back on to the rollers. The numbers they give are just general and vary even on the same dyno on the same day.
Really the best indication of HP is trap speed even more so than ET. If you have two cars that have exactly the same hp and weight they'll trap just about the same. However, if one is set up for the 1/4 with lower control arms, slicks etc… that car can and will run much quicker times. A good example are all wheel drive cars some of them will run low 13’s while not even breaking 100mph.
Really the best indication of HP is trap speed even more so than ET. If you have two cars that have exactly the same hp and weight they'll trap just about the same. However, if one is set up for the 1/4 with lower control arms, slicks etc… that car can and will run much quicker times. A good example are all wheel drive cars some of them will run low 13’s while not even breaking 100mph.