4.5 SuperSport Power Run Graph -- Non Decatted
Discussion
I had my bespoke mapping today, followed by Power run with Jason and Dom at Power Performance.
Configuration Tuscan 'S' convertible,standard exhaust with cats, ACT airbox with trumpets,3:73 diff otherwise standard. Comparision with a "Good" Standard 4 litre non decatted Tuscan (there were alot much worse and not all Tuscans). Cats do degrade all performance considerably.
Configuration Tuscan 'S' convertible,standard exhaust with cats, ACT airbox with trumpets,3:73 diff otherwise standard. Comparision with a "Good" Standard 4 litre non decatted Tuscan (there were alot much worse and not all Tuscans). Cats do degrade all performance considerably.
Edited by glow worm on Wednesday 14th August 20:37
At the risk of getting flamed, that torque graph looks very good, but the power graph doesn't... After bespoke mapping of my 4.0 de-catted Sag at Powers Performance I got virtually the same BHP graph as you (in fact 369bhp max) but the TORQUE curve of the lower graph ...
Seems a bit wierd.
Seems a bit wierd.
We (Jason and I) reckonned the cats were causing a loss of between 40-50 BHP comparing various other power runs.
However looking at some 4 litre Decatted runs, not all gave good figures. So there are good and bad engines.
The standard exhaust on a Tuscan however does give better figures that a standard exhaust on a Sag .
Maybe one day I'll get the cats removed... but I don't want MOT issues with emmisions and I don't often hit 6000 revs
.
However looking at some 4 litre Decatted runs, not all gave good figures. So there are good and bad engines.
The standard exhaust on a Tuscan however does give better figures that a standard exhaust on a Sag .
Maybe one day I'll get the cats removed... but I don't want MOT issues with emmisions and I don't often hit 6000 revs
.Edited by glow worm on Thursday 15th August 12:37
glow worm said:
We (Jason and I) reckonned the cats were causing a loss of between 40-50 BHP comparing various other power runs.
However looking at some 4 litre Decatted runs, not all gave good figures. So there are good and bad engines.
The standard exhaust on a Tuscan however does give better figures that a standard exhaust on a Sag .
Maybe one day I'll get the cats removed... but I don't want MOT issues with emmisions.
You should use Racing Green Sports cats, they will give you 30 of these horses back without the MOT problem.However looking at some 4 litre Decatted runs, not all gave good figures. So there are good and bad engines.
The standard exhaust on a Tuscan however does give better figures that a standard exhaust on a Sag .
Maybe one day I'll get the cats removed... but I don't want MOT issues with emmisions.
RedSpike66 said:
At the risk of getting flamed, that torque graph looks very good, but the power graph doesn't... After bespoke mapping of my 4.0 de-catted Sag at Powers Performance I got virtually the same BHP graph as you (in fact 369bhp max) but the TORQUE curve of the lower graph ...
Seems a bit wierd.
My decatted Tuscan 4.0 non s with Power rebuild showed 366bhp, so very close to the top graph and to your Sag.Seems a bit wierd.
Cats are robbers of power
blueg33 said:
My decatted Tuscan 4.0 non s with Power rebuild showed 366bhp, so very close to the top graph and to your Sag.
Cats are robbers of power
Can you put the graph up on here ? a non S @ the wheels on Powers dyno? I saw one which didn't make 300 bhp.Cats are robbers of power
I suppose if you add 40 bhp to the 4 litre catted graph , you're at the same as mine. But you won't match the torque
.Edited by glow worm on Thursday 15th August 17:55
glow worm said:
blueg33 said:
My decatted Tuscan 4.0 non s with Power rebuild showed 366bhp, so very close to the top graph and to your Sag.
Cats are robbers of power
Can you put the graph up on here ? a non S @ the wheels on Powers dyno? I saw one which didn't make 300 bhp.Cats are robbers of power
I suppose if you add 40 bhp to the 4 litre catted graph , you're at the same as mine. But you won't match the torque
.Edited by glow worm on Thursday 15th August 17:55
I guess the thing I am not certain of if whether there were upgrades on the rebuild as it was done about 6 months before I bought the car. But I do recall the print outs to the extent that I can see them in my head. Dom also said it was pretty good
Decatting reduces torque ? Please explain.
I think comparing the two graphs is what you would expect when comparing two cars both with cats ... or are you saying both cars have cat problems ?
Having experienced the airflow and exhaust flows at 6500 revs I can't see my cats being blocked . Burning hydrocarbons with a 15:1 oxygen ratio creates a lot of exhaust gases.
I think comparing the two graphs is what you would expect when comparing two cars both with cats ... or are you saying both cars have cat problems ?
Having experienced the airflow and exhaust flows at 6500 revs I can't see my cats being blocked . Burning hydrocarbons with a 15:1 oxygen ratio creates a lot of exhaust gases.
Edited by glow worm on Thursday 15th August 22:46
glow worm said:
Decatting reduces torque ? Please explain.
I think comparing the two graphs is what you would expect when comparing two cars both with cats ... or are you saying both cars have cat problems ?
Having experienced the airflow and exhaust flows at 6500 revs I can't see my cats being blocked . Burning hydrocarbons with a 15:1 oxygen ratio creates a lot of exhaust gases.
I think comparing the two graphs is what you would expect when comparing two cars both with cats ... or are you saying both cars have cat problems ?
Having experienced the airflow and exhaust flows at 6500 revs I can't see my cats being blocked . Burning hydrocarbons with a 15:1 oxygen ratio creates a lot of exhaust gases.
Edited by glow worm on Thursday 15th August 22:46
http://www.pistonheads.com/gassing/topic.asp?f=10&...
Did you not do some RR runs at power with your old engine before the upgrade for comparison?
WolfyJones said:
spitfire4v8 said:
^^ and in any case the cats aren't that restrictive .. I've no idea where numbers of 40-50bhp gains come from decatted, try 7 or 8 hp!
That was also my understanding, and doesn't decatting also bring the torque down?Maybe its got a blocked cat????
Had my mechanic take it out for a test drive today... He was very impressed... driveability means a lot more to me than numbers.
Those standard 4 litre Sags are very poor . Loads more torque with a Tuscan .
Doms 5 Litre vs a 4 Litre Sag .. I think TVR told a few lies.
Those standard 4 litre Sags are very poor
. Loads more torque with a Tuscan .Doms 5 Litre vs a 4 Litre Sag .. I think TVR told a few lies.
Edited by glow worm on Monday 19th August 19:16
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