Rolling road graph torgue tail off?
13-06-2006, 04:16 PM
#1
Advanced PassionFord User
Thread Starter
Join Date: Jun 2003
Location: Lancashire
Posts: 1,627
Likes: 0
Received 0 Likes
on
0 Posts
Rolling road graph torgue tail off?
Hi I was a guest car at a GT4 day on saturday here are the results.
The car made more power the first run but my exhaust set fire to the bumper and the sensor fell off
It was far too hot for my run (11.30 ) so I am happy at the power, but the torgue seems to fall off very quick.
do you think it is down to the heat?
Dave.
The car made more power the first run but my exhaust set fire to the bumper and the sensor fell off
It was far too hot for my run (11.30 ) so I am happy at the power, but the torgue seems to fall off very quick.
do you think it is down to the heat?
Dave.
13-06-2006, 07:46 PM
#4
PassionFord Post Whore!!
Join Date: May 2003
Location: Northants
Posts: 9,076
Likes: 0
Received 0 Likes
on
0 Posts
292@wheels seems to compare favourably with my 220@wheels when on greens 
IIRC, you're on a T4 & greys? How does it feel on the road, seems quite a narrow powerband from the graph, but RR graph's can be misleading.... Glad you've got it up and running okay after all the aggro you've had
Did you have any headwork/cams done in the end - could possibly be another reason for the drop off, if not?
IIRC, you're on a T4 & greys? How does it feel on the road, seems quite a narrow powerband from the graph, but RR graph's can be misleading.... Glad you've got it up and running okay after all the aggro you've had
Did you have any headwork/cams done in the end - could possibly be another reason for the drop off, if not?
13-06-2006, 08:53 PM
#6
Originally Posted by Billabong
Torque seems to tail off with the boost dropping off.....
Why did they run it up in 3rd?
Why did they run it up in 3rd?
The boost figure drops by almost 10psi by the end of the run, which probably explains the drop in Torque. Maybe the rollers weren't loaded up enough to allow the car to make full boost.
Trending Topics
13-06-2006, 10:00 PM
#10
PassionFord Post Whore!!
Join Date: May 2003
Location: Northants
Posts: 9,076
Likes: 0
Received 0 Likes
on
0 Posts
Any idea why Christian? Surely that just adds more 'calculations' into the mix when 4th is nigh on 1:1?
T34.48
I wouldn't really be happy with that if the RR run was accurate (powerband, not figures)
T34.48
I wouldn't really be happy with that if the RR run was accurate (powerband, not figures)
14-06-2006, 04:10 PM
#15
Advanced PassionFord User
Thread Starter
Join Date: Jun 2003
Location: Lancashire
Posts: 1,627
Likes: 0
Received 0 Likes
on
0 Posts
There chart doesn't seem right does it 69 horse power at 4000 revs
Thats wrong it starts pulling at 3000 then by 4000 its at full boost ( 30+ )
I want a refund
Dave.
Thats wrong it starts pulling at 3000 then by 4000 its at full boost ( 30+ )
I want a refund
Dave.
14-06-2006, 04:20 PM
#16
MAybe the rolling road operator didnt press the throttle down very far until over 4000rpm for some reason?
The tailing off is fairly typical of a .48 housing, although yours seems a little exagerated.
The tailing off is fairly typical of a .48 housing, although yours seems a little exagerated.
14-06-2006, 06:05 PM
#20
Dave - When i had problems with my turbo being very very laggy ended up the wastegate was slightly bent and not sealing properly....Didn't make any boost till nearly 4500rpm which really fucked me off as it's only a T34 .48 
When i had my cyclinder head repaired last year it was noticed and was sent to be sorted out by Vince @ UT.
He replaced the slightly bent parts and quickly overhauled it (Wasn't much needed) then when i got it back i made full boost (1.7BAR) by 3000rpm Made the car so so much better to drive 
Had the map/gueling checked and was ok... I was so happy, went like fook 
Do you use air injectors or an amal valve?
When i had my cyclinder head repaired last year it was noticed and was sent to be sorted out by Vince @ UT.He replaced the slightly bent parts and quickly overhauled it (Wasn't much needed) then when i got it back i made full boost (1.7BAR) by 3000rpm
Made the car so so much better to drive Had the map/gueling checked and was ok... I was so happy, went like fook Do you use air injectors or an amal valve?
14-06-2006, 06:23 PM
#21
Advanced PassionFord User
Thread Starter
Join Date: Jun 2003
Location: Lancashire
Posts: 1,627
Likes: 0
Received 0 Likes
on
0 Posts
I use air injectors which when it comes on boost goes straight to 30 psi and stays there to nearly 7000.
but the graph he gave me shows the boost all over the place
Dave.
but the graph he gave me shows the boost all over the place
Dave.
14-06-2006, 06:31 PM
#22
PassionFord Post Whore!!
Join Date: May 2003
Location: Northants
Posts: 9,076
Likes: 0
Received 0 Likes
on
0 Posts
Shonky run then, maybe the suitable RR setup for a GT-4 is way off for a Cossie (you said it was a GT-4 day), although a decent operator should have settings to suit.
(you said it was a GT-4 day), although a decent operator should have settings to suit.
14-06-2006, 07:59 PM
#24
I've found that life I needed.. It's HERE!!
Join Date: Jul 2005
Location: Cheltenham
Posts: 1,112
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by TF Rallyesport
mine doesnt drop off anything like that.and my god its making hardly any power even at 4k,bet its crap to drive.
16-06-2006, 09:31 AM
#27
Too many posts.. I need a life!!
Join Date: May 2003
Posts: 617
Likes: 0
Received 0 Likes
on
0 Posts
Mike I suggest you get your facts right before you make such accuations
something that people do not realise is that cars normally make more power at the wheels in 3rd gear than they do in 4th
surely you would want your car to be able to produce max power on a run ?
My opinion on the graph is this
The operator has not used the rpm pickup - getting a signal from an Escort Cosworth is very very easy - It looks to me the rpm is not fully correct (this will not affect the HP )
The torque does drop off quite rapidly - this is common on engines where the cylinder head is restrictive - does the car have a ported head on it ?
Remember at the end of the day it is power at the wheels that is important
I would recommend retesting the car in 4th to compare the boost pressures
something that people do not realise is that cars normally make more power at the wheels in 3rd gear than they do in 4th
surely you would want your car to be able to produce max power on a run ?
My opinion on the graph is this
The operator has not used the rpm pickup - getting a signal from an Escort Cosworth is very very easy - It looks to me the rpm is not fully correct (this will not affect the HP )
The torque does drop off quite rapidly - this is common on engines where the cylinder head is restrictive - does the car have a ported head on it ?
Remember at the end of the day it is power at the wheels that is important
I would recommend retesting the car in 4th to compare the boost pressures
16-06-2006, 09:45 AM
#30
Originally Posted by Mike Gurney
Mike I suggest you get your facts right before you make such accuations
something that people do not realise is that cars normally make more power at the wheels in 3rd gear than they do in 4th
surely you would want your car to be able to produce max power on a run ?
My opinion on the graph is this
The operator has not used the rpm pickup - getting a signal from an Escort Cosworth is very very easy - It looks to me the rpm is not fully correct (this will not affect the HP )
The torque does drop off quite rapidly - this is common on engines where the cylinder head is restrictive - does the car have a ported head on it ?
Remember at the end of the day it is power at the wheels that is important
I would recommend retesting the car in 4th to compare the boost pressures
something that people do not realise is that cars normally make more power at the wheels in 3rd gear than they do in 4th
surely you would want your car to be able to produce max power on a run ?
My opinion on the graph is this
The operator has not used the rpm pickup - getting a signal from an Escort Cosworth is very very easy - It looks to me the rpm is not fully correct (this will not affect the HP )
The torque does drop off quite rapidly - this is common on engines where the cylinder head is restrictive - does the car have a ported head on it ?
Remember at the end of the day it is power at the wheels that is important
I would recommend retesting the car in 4th to compare the boost pressures
. Irrespective of what gear it is running in, if it doesn't load the car up how it is loaded on the road, the figures will be WAY off.Unless of course, you're saying that the difference of 10psi wouldn't amount to much
.
16-06-2006, 09:55 AM
#31
Originally Posted by TF Rallyesport
and how can an engine make more power if your in a different gear?
16-06-2006, 10:00 AM
#32
Originally Posted by Stu @ M Developments
Originally Posted by TF Rallyesport
and how can an engine make more power if your in a different gear?
And then as power is a function of torque and rpm, the power should be essentially the same?
16-06-2006, 10:06 AM
#33
Originally Posted by chip-3door
Technically, the more torque not hte more power surely? And then as power is a function of torque and rpm, the power should be essentially the same?
16-06-2006, 10:12 AM
#34
Professional Waffler
i persoanlly think that we have performance cars all wrong,,,, we should vary the gear ratio and not the engine speed! 
the engine should be held at peak HP, and the gearbox should be adjustable maybe offset cones, or im sure there is another way i just havent thought about it enough
the engine should be held at peak HP, and the gearbox should be adjustable
maybe offset cones, or im sure there is another way i just havent thought about it enough
16-06-2006, 10:16 AM
#35
Originally Posted by GARETH T
i persoanlly think that we have performance cars all wrong,,,, we should vary the gear ratio and not the engine speed!
the engine should be held at peak HP, and the gearbox should be adjustable maybe offset cones, or im sure there is another way i just havent thought about it enough
the engine should be held at peak HP, and the gearbox should be adjustable
maybe offset cones, or im sure there is another way i just havent thought about it enough
16-06-2006, 10:18 AM
#36
Professional Waffler
sadly mate,, im too lazy someone else will nick my idea and be the billionair 
! ive tried to patent things before,, its just too hard and expensive 
! ive tried to patent things before,, its just too hard and expensive
.