347 Dyno Results Discussion

[Breecher_7]

3000lbs is a little light isnt it?

[Reverend Cooper]

why is that motor only being spun up to less then 5000rpms?

[Lash]

Both of them have a max RPM of just over 6K. It's printed at the bottom of the dyno sheets. Those are just the RPM's that it made max power at.

[2006wrxtr]

also it keeps pegging the meter.. Yes 3k is probably a bit light but that is the weight they use for all the cars they dyno. And hey they are just #'s right what really matters is how the car drives..

[Breecher_7]

also it keeps pegging the meter.. Yes 3k is probably a bit light but that is the weight they use for all the cars they dyno. And hey they are just #'s right what really matters is how the car drives..

Incorrect. If the correct weight is not selected the dyno will not read accuratly. If the weight is less then the actual vehicle weight the dyno will read higher then it actually is. Mustang dyno's take alot into account. There not like inertia type units that use a set 3000lb load. Odds are the car isnt making as much power as you think. Actual vehicle weight is taken into account and so is other things. The mustang software has the weights and the hp required to maintain 50mph on record for all cars. As you can see they are saying it takes 12hp to maintain 50mph with your car. (based on weight and wind resistance as well as other factors) That sounds about right but im unsure without looking at the software firsthand.

Point is, if the vehicle weight isnt right, the dyno isnt loading the car correctly. Therefore your a/f will be different on the street then it was on the dyno and your real hp numbers will be different as well.

The A/F being incorrrect would be my main concern due to improper load.

[Poncho]

Breecher is right but if you say
"Hey they are just #'s right what really matters is how the car drives.."
why even go to the dyno?

[2006wrxtr]

yeah well I wasn't really happy with the way they did the tune and won't be going back to them.

I figure the weight should be around 3400#'s

Also does everyone that goes to a Mustand dyno weigh their car before they go? I really doubt that. I am going to weigh the car and have another shop retune when I put the bigger meter in.

Just thought I would post up the sheets and get some feedback.

[Breecher_7]

yeah well I wasn't really happy with the way they did the tune and won't be going back to them.

Also does everyone that goes to a Mustand dyno weigh their car before they go? I really doubt that. I am going to weigh the car and have another shop retune when I put the bigger meter in.

Just thought I would post up the sheets and get some feedback.

No, they dont weigh it. The powerdyne software has the FACTORY weights of just about every car and motorcycle on the planet programmed into it though. And if its a modified race car that is significantly lighter, most people know what there race car weights and the numbers can be crunched to figure out hp@50.

[2006wrxtr]

No, they dont weigh it. The powerdyne software has the FACTORY weights of just about every car and motorcycle on the planet programmed into it though. And if its a modified race car that is significantly lighter, most people know what there race car weights and the numbers can be crunched to figure out hp@50.

yeah well that wouldn't work for the weight of my car considering all the mods. I do have some mods that lighten it but then put some weight back in with the cage and sub connectors. The car had a 1/4 tank of gas in it.

Lightning mods: Rear seat gone; Tube K member-40#, Tube control arms, Coil overs, Aluminum Heads - 40#, No spare tire or jack -30#, no radio, Fan gone, Aluminum Driveshaft, 17# fly wheel -10#. Also alot of the sound deadning was removed and the wheels are lighter than stock.

Now I did add: vortech +50#, Subs +25#, Cage +75#.
The way I figure it the car should be a bit lighter than it came form hte factory and me @ 175#
would make it right around 3k.


http://consumerguideauto.howstuffwor...-mustang-4.htm

When I weighed my 97 cobra with me in it it was 3250 #'s

This source says 2834#

[Poncho]

2800?? thats like integra/civic light!

[badass88gt]

That consumer guide site is WAYYYYYYY off.

[Windsors 03 Cobra]

My Ford book says a 90 LX Hatch V8 weighs 3102

A quick google put integras at 2664 and civic hatches at 2200

[BAD LS1]

Its been my finding since playing on the dyno the weight makes the biggest diff in how hard it loads the car, like my monte at the 3800lbs that was said it weighs by MD's chart it loaded the car so hard that it just sat on the converter and wouldn't accelerate.

So we dropped it to 3300 lbs which is much closer, then it made a full sweep and didnt take near as long to do it. So with the drop in weight input, it let the rollers spin like a dynojet pretty much.

[2006wrxtr]

the GVWR is 4230# on the door sticker. But that is the load the vehicle can carry fullu loaded. How do they figure that out? I thik they add 150# x 4 = 600 for 4 people and 200# in cargo I think. wich would leave 3200# probably about right.

I got this off reinhold racings site 3192# for my lx Weight savings
stock 87-93 K-member 58 lbs UPR K member 18lbs 40#
stock 87-93 A -arms (each) 10.5 lbs UPR A arms 05lbs each 10#
stock 87-93 heater assembly 28 lbs no heater 00lbs 28#
87-93 sound dedner 22 lbs removed 1/2 11lbs 11#
87-93 tar paper 23 lbs removed all 23lbs 23#
stock 87-93 driveshaft 19 lbs Alum Shaft 16lbs 03#
87-93 Smog pump & emissions 10 lbs Deleted 10lbs 10#
stock 87-93 front spring (each) 10lbs Coilover spring 05lbs 05#
Aluminum Heads -50lbs 50#
Rear seats -30lbs 30# Spare tire -30lbs 30#
A/C Delete -25lbs 25#
Total: -265#

Now I did Add the Vortech wich is about 50#
And the cage about 75#

So I probably shave about 115# off the car wich would leave me at 3052#
The car will adjust for any weight differences when I drive it on the road.
I would think the computer has the ability to do this or the car would never
run right because the weights wre constantly changing depending on
various factors.

Now I know these aren't exact weights and the car could go either way that is why I would
really like to put it on a scale. maybe 3000# wasn't that far off..

[07ROUSHSTG3]

why not just find a truck scale??

[2006wrxtr]

Its been my finding since playing on the dyno the weight makes the biggest diff in how hard it loads the car, like my monte at the 3800lbs that was said it weighs by MD's chart it loaded the car so hard that it just sat on the converter and wouldn't accelerate.

So we dropped it to 3300 lbs which is much closer, then it made a full sweep and didnt take near as long to do it. So with the drop in weight input, it let the rollers spin like a dynojet pretty much.

Weight really wasn't that far off..

[Breecher_7]

Weight really wasn't that far off..

a few hundred pounds make a pretty big difference.

[2006wrxtr]

a few hundred pounds make a pretty big difference.

Yes it does, mine was probably less than 100# off
If I was near and it wasn't snowing I would take you for a ride and
you could tell me if it doesn't feel like 500whp. It will break the tires
loose in 4th gear when the boost comes in. Sideways @ 90mph is a
bit scary.

I know where your coming from the #'s aren't exact because the weight isn't.

Yes I will get it on a truck scale. I have a broken poly lock right now so have to wait to get that before I do anymore driving.

[Poncho]

a few hundred pounds make a pretty big difference.

yea... my poor car...

[Poncho]

where do you get a few hundred? Probably around 100# or less few hundred would be 3300# or more.

If I was near and it wasn't snowing I would take you for a ride and
you could tell me if it doesn't feel like 500whp. It will break the tires
loose in 4th gear when the boost comes in. Sideways @ 90mph is a
bit scary.

I know where your coming from the #'s aren't exact because the weight isn't.

Yes I will get it on a truck scale. I have a broken poly lock right now so have to wait to get that before I do anymore driving.

in the cold or warm?