Effects on mods same dyno

**Stav** · 29-12-2006, 10:27 AM

Well here we go. I have decided to release my compilation of data which I have collected over the past few years which were recorded for various cars on the same dyno shop.
In the list you will see dev 5 .This is an auto au with dev5 unichip and 3.45 gears.
The crow is the same car with just a crow cam.
Dev 4 auto is my car with autotech tune dv 4 cam./histall and 3.73 diff
Dev4 croy is the croydon tune in my car 3.73 diff/histall
XR6ute from memory is a standard aitomatic xr6 ute /exhaust cai with autotech tune.
DEV3HL is an auto au wagon with unichip .
Dev 4 no diff is my car pre diff and unichip
Dev 4fort is my car ford tune no diff.
BMW 330CI is my brothers car..it blitzes all of our fords in power everywhere.
xr6auto is an xr6 with just xorst and no tune
stok+exha is a fairmont with just exhaust
xr6manu is manual xr6 with just xorst/headers

xr6chip is the same manual car with unichip.

dev5 is the same car manualxr6 with dev 5 /unichip

I based the graph on kmh as I am not sure about conversion for rpm and will let you guys decide.

Power in rwkws on left scale and kmph on horizontal reading.You will notice that my earliest kmph reading is 80.This is because most dynos dont record until this speed.The final speed on the scale is 150 because this is sufficient to show most sixes 1/4 mile 14 second et. Also first rwks is 50.

graph is here http://www.fordforums.com.au/photos/...cat=500&page=1

**Stav** · 29-12-2006, 11:06 AM

Any suggestions on improving this sheet or explanation please feel free to comment .

smiley · 29-12-2006, 11:15 AM

do you have the rpm range these cars were using to give the graphed results? Seeing as you have instantaneous power readings, it might be helpful to calculate the average power/rpm figure as this is far more important than peak. Obviously the BMW would have the highest average yet it could give better distinguished results between those cars who overlap each other a lot on the graph.

Other than that, your pre-existing graph is easy to read and a good comparison to go by.

**Stav** · 29-12-2006, 01:08 PM

Quote:

Originally Posted by smiley

do you have the rpm range these cars were using to give the graphed results? Seeing as you have instantaneous power readings, it might be helpful to calculate the average power/rpm figure as this is far more important than peak. Obviously the BMW would have the highest average yet it could give better distinguished results between those cars who overlap each other a lot on the graph.

Other than that, your pre-existing graph is easy to read and a good comparison to go by.

My car has a 3.73 diff,bmw has 3.7 diff as well. Apart from that the non xr stock car has a 3.23 diff ratio.All xr6's and the dev 5,3,crow auto have a 3.45 diff ratio.

it is unfortunate also that dynos do not show power from 0kmph onwards.It seems that the power below is just as relevant as power above.

xr8ute · 29-12-2006, 11:49 AM

Damn....look at the curve of your brothers 330ci compared to the rest.

BMW know their stuff.

**Stav** · 29-12-2006, 01:04 PM

Quote:

Originally Posted by xr8ute

Damn....look at the curve of your brothers 330ci compared to the rest.

BMW know their stuff.

Its true unfortunately. The dam bmw is quick and with a six cylinder 3 litre engine. I dont think I want to run him at all.

chief · 29-12-2006, 01:10 PM

You have to much time on your hands Stav. Looks very interesting for comparison.

**Stav** · 29-12-2006, 01:14 PM

Quote:

Originally Posted by chief

You have to much time on your hands Stav. Looks very interesting for comparison.

Hahha I am having a break and thought it would be intersting to see the differences.Typically and xr6 pulls 7-8 rwkws more in standard form over non xr cars in an auto or manual class. A manual box does give 10 to 12 rwkw moere power than an auto.

chief · 29-12-2006, 02:49 PM

Also I heard that a stall convertor will lose some kw on a dyno. Is that true or just someone trying to save face after not having the power they thought.

**Stav** · 29-12-2006, 03:27 PM

Mate personally I lost at peak only 2 rwkws with my stallie and gained .2 to.3 second down the 1/4.

If anyone really wants tips on going faster then most of their answers will be in this thread if they look carefully enough.

xr8ute · 29-12-2006, 03:38 PM

Quote:

Originally Posted by chief

Also I heard that a stall convertor will lose some kw on a dyno. Is that true or just someone trying to save face after not having the power they thought.

They say there is usually more "slip" in a converter that stalls at a higher rpm. More slip means less power to the rear wheels....but they more than make up for that during the first 60-330ft at the track.

poolkeeper · 29-12-2006, 03:42 PM

Quote:

Originally Posted by xr8ute

They say there is usually more "slip" in a converter that stalls at a higher rpm. More slip means less power to the rear wheels....but they more than make up for that during the first 60-330ft at the track.

yeah, at the end of the day if it gets you there quicker its better

poolkeeper · 29-12-2006, 04:12 PM

Seeing and knowing thats my car, makes me want to get a cam now

But 166000km's hmmm, is it safe???

xr8ute · 29-12-2006, 04:15 PM

Quote:

Originally Posted by D1XR2C

But 166000km's hmmm, is it safe???

bloody oath....do it!!!!

NOTE: I should add...if it was my car, I would change the valvesprings with the cam. They wont be as stiff now as they where 160,000 kays ago ;)

**Stav** · 29-12-2006, 04:16 PM

But do you ? You have more power to 140/150 kays than a tuned dev 5 kit. Why would you spend the money? Your car is very healthy as is.

HLC · 29-12-2006, 06:14 PM

what sort of power are you putting out?

poolkeeper · 29-12-2006, 06:15 PM

Quote:

Originally Posted by HLC

what sort of power are you putting out?

who me??

**Stav** · 29-12-2006, 06:36 PM

D1XR2C is the xr6 ute in my data. Mine is the croydon dev 4 tune one as current as recorded at autotech dyno day..Yours Henri is actually the non xr exhaust only example.Yes your dyno sheet was used.

HLC · 29-12-2006, 07:19 PM

Quote:

Originally Posted by D1XR2C

who me??

yeah mate, sorry for the confusion.

XRated · 29-12-2006, 09:22 PM

Is the Bimmer stock? Any chance you have the figures for an AU 200/220?

**Stav** · 30-12-2006, 12:04 AM

The bmw is stock..it seriously hauls.I have only got this data because I was interested in seeing the difference related to my car and its engine.

XRated · 30-12-2006, 12:07 AM

Fair enough. I'd just be interested how the Ford 5l compares to the 4l across the board.

The Bimmer should do the 1/4 mile in 15-15.5 stock I think. The next model (twin turbo) does it in ~13.5 seconds. Nice!

**Stav** · 30-12-2006, 09:19 AM

Im doing back to back 14.8s and one 14.7 so far.The bmw just leaves me for dead.It actually pulls away from stock xr6t's and ba xr8's.The bimmer has engine technology way ahead of ford. They have variable height cams for example.The lift of the cam is adjusted by the computer and hence a great power delivery.

As for figures on v8's I have photos of dynos on around 50 v8's and the cars themselves.Analysing that data will take a long time.

The other thing is that I have found an inconsistency between v8 dynos /six cylinder dynos and 1/4 mile times. V8 dynos show marvellous power curves while six shooters show much less power everywhere. Despite this I have seen 220 kw xr8's pull 180 rwkws and do 14.7's at the track!!I am pulling a max of 131 rwkws and pull similar times.Same as Casper actually. You would seriously have to say that despite gearing and the likes that both cars rear tyres must be putting out similar acceleration power to the ground to produce similar results. So when you objectively try to look at a comparison between v8's and sixes it is a bit misleading.Timeslips are a big help in that case.

If you would like to see the dynos you are welcome..just let me know.