Taking the XJR to the dyno...Guess what I will run
#1
![Default](/forum/images/icons/icon1.gif)
I'm taking my xjr to the dyno this saturday. I thought it would be fun to have a friendly competition and guess what I'll put down. Mods are in my signature. My guess...338whp and 394 ft lbs...I like to mix it up, lol
What's your guess?
What's your guess?
Last edited by budsang1; 10-01-2009 at 10:21 PM.
#7
Join Date: Sep 2008
Location: Damon /Houston, Texas
Posts: 7,254
Received 2,192 Likes
on
1,358 Posts
![Default](/forum/images/icons/icon1.gif)
depends on what dyno you use, Dyno Dynamics, and Mustang dynos are always lower that Dyno Jet, But they are much more realistic to actual numbers. So what are you gonna dyno on, real world, or overly optimistic?
And then what are the correction factors used for altitude, humidity temps etc..
And then what are the correction factors used for altitude, humidity temps etc..
Trending Topics
#8
![Default](/forum/images/icons/icon1.gif)
well, it was also my first time running a car at the track, and had a bit of wheel spin. That number will improve. I don't expect big gains from the mina exhaust and intake
#11
#13
![Default](/forum/images/icons/icon1.gif)
There can be a number of different factors that could result in a lower reading...
Assuming a 20% drivetrain loss from the automatic gearbox, you are sitting at exactly 380bhp to the crank and 387.5ft. lbs to the crank. These numbers are lower than stock which is why I think the weather and conditions may have had a huge influence on your numbers....
#16
![Default](/forum/images/icons/icon1.gif)
I wonder whats can be done to lessen the "engine heat soak" issue with these XJR's .
What were the ambient temperatures during this run? And do you know the elevation of the shop where these numbers were taken?
Last edited by budsang1; 10-03-2009 at 09:36 PM.
#17
![Default](/forum/images/icons/icon1.gif)
Well I took a closer look at the dyno chart and noticed that the dyno your car was run on is manufactured by Dyno Dynamics...which is widely known as the "Heartbreak Dyno".
The reason for this is that the Dyno Dynamics dyno reads significantly lower than a dynojet and even a mustang dyno.
Somebody correct me if I am wrong but the Dyno Dynamics dyno usually reads 10%-15% lower than a dynojet. If we take the average of these two, at 12.5%, your wheel horsepower on a dynojet may be around 342rwhp and 349ft. lbs.
These numbers sound about right for the modifications you have done to the car. That intake, when the hood is open, should give you a healthy gain...the exhaust may have helped as well.
My car, with just a 1.5lb upper pulley and oil that was run for 7500 miles made 340rwhp and 346ft. lbs on a dynojet.
Hopefully this makes you feel better about that 304rwhp reading!
The reason for this is that the Dyno Dynamics dyno reads significantly lower than a dynojet and even a mustang dyno.
Somebody correct me if I am wrong but the Dyno Dynamics dyno usually reads 10%-15% lower than a dynojet. If we take the average of these two, at 12.5%, your wheel horsepower on a dynojet may be around 342rwhp and 349ft. lbs.
These numbers sound about right for the modifications you have done to the car. That intake, when the hood is open, should give you a healthy gain...the exhaust may have helped as well.
My car, with just a 1.5lb upper pulley and oil that was run for 7500 miles made 340rwhp and 346ft. lbs on a dynojet.
Hopefully this makes you feel better about that 304rwhp reading!