Post your dyno curve here
Discussion
N7GTX said:
Okay, thanks.
So it goes to show how different ECUs and tuners get their results. Take Sapper's figures for a 4.0 litre like mine with a turbo. His was done by Eann Whalley with a Megasquirt ecu.
Mine at Powers with an MBE ecu.
Sapper: 362 bhp and 422 torques.
Mine: 355 bhp and 481 torques.
And the graphs are completely different too. Any thoughts?
Cam, heads, ?So it goes to show how different ECUs and tuners get their results. Take Sapper's figures for a 4.0 litre like mine with a turbo. His was done by Eann Whalley with a Megasquirt ecu.
Mine at Powers with an MBE ecu.
Sapper: 362 bhp and 422 torques.
Mine: 355 bhp and 481 torques.
And the graphs are completely different too. Any thoughts?
ClassiChimi said:
N7GTX said:
Okay, thanks.
So it goes to show how different ECUs and tuners get their results. Take Sapper's figures for a 4.0 litre like mine with a turbo. His was done by Eann Whalley with a Megasquirt ecu.
Mine at Powers with an MBE ecu.
Sapper: 362 bhp and 422 torques.
Mine: 355 bhp and 481 torques.
And the graphs are completely different too. Any thoughts?
Cam, heads, ?So it goes to show how different ECUs and tuners get their results. Take Sapper's figures for a 4.0 litre like mine with a turbo. His was done by Eann Whalley with a Megasquirt ecu.
Mine at Powers with an MBE ecu.
Sapper: 362 bhp and 422 torques.
Mine: 355 bhp and 481 torques.
And the graphs are completely different too. Any thoughts?
Edited by N7GTX on Monday 7th December 23:50
N7GTX said:
I don't what Sapper's done to his. Mine's got an E0158 camshaft (shows as 4.0 cam on their website), ACT manifolds and decatted Y piece. So far as I know its all standard otherwise.
Standard engine, heads cam etc. Turbo and emerald ecu, act exhaust, tuned by Joolz.12psi of boost
Edited by sapper on Monday 7th December 21:25
M
N7GTX said:
Now I'm totally confused 
Without phoning up Dom, does anyone know for sure if the graph he does for his rolling road, shows the BHP and Torque at the wheels or at the flywheel?
All these different rolling roads and 18% drivetrain losses with some graphs at the fly, and some at the wheels, doing me head in
The graphs that Jay (not Dom) produce are at the wheels so your fly figure will be significantly higher. I have spoken to him about your car (and others) during our many technical chats and your figures are definitely wheel based as are all others off their dyno. And he does use 15% drivetrain losses which he admits are somewhat conservative. Your car is running high boost and the output figures reflect that. He (Jay) is a very talented mapper, he'll get what he can out of an engine but won't risk breaking it. Without phoning up Dom, does anyone know for sure if the graph he does for his rolling road, shows the BHP and Torque at the wheels or at the flywheel?
All these different rolling roads and 18% drivetrain losses with some graphs at the fly, and some at the wheels, doing me head in
Personally I'm comfortable with the 18% drive train loss figure, I did a lot of research on this at one point and for a host of reasons 18% kept coming up as the golden percentage.
As such last time 'Ol Gasbag' wheezed out her best on a rolling road she gave 211.5hp where her rubber met the rollers which applying the 18% rule is 249.57hp at the crank, this seems to me a perfectly respectable figure for a 4.0 litre Chimaera with zero head work running on LPG.
In the face of all the big horsepower quoted on these pages it's easy to feel inferior with such a number, but equally its all too easy to forget these are very light cars with a good torque to power ratio (even a standard 4.0 litre).
And while 'Ol Gasbag' caries a fraction more weight in her rump I feel she still makes for a fun classic to shlack about in, especially when you know she comes with 50mpg petrol cost equivalent fuel economy
Personally I think it would be better for us all to move on from the crank/flywheel figures and just quote the wheel/hub figure, of course that opens up a whole new "what rolling road did it make that figure on" argument. But just quoting the wheel/hub figure would at least eliminate the drive train loss percentage argument once and for all...
Of course doing things this way would ultimately mean people would need to quote a lower figure, so I can easily see how my suggestion might not be a very popular one...
As such last time 'Ol Gasbag' wheezed out her best on a rolling road she gave 211.5hp where her rubber met the rollers which applying the 18% rule is 249.57hp at the crank, this seems to me a perfectly respectable figure for a 4.0 litre Chimaera with zero head work running on LPG.
In the face of all the big horsepower quoted on these pages it's easy to feel inferior with such a number, but equally its all too easy to forget these are very light cars with a good torque to power ratio (even a standard 4.0 litre).
And while 'Ol Gasbag' caries a fraction more weight in her rump I feel she still makes for a fun classic to shlack about in, especially when you know she comes with 50mpg petrol cost equivalent fuel economy
Personally I think it would be better for us all to move on from the crank/flywheel figures and just quote the wheel/hub figure, of course that opens up a whole new "what rolling road did it make that figure on" argument. But just quoting the wheel/hub figure would at least eliminate the drive train loss percentage argument once and for all...
Of course doing things this way would ultimately mean people would need to quote a lower figure, so I can easily see how my suggestion might not be a very popular one...
KateV8 said:
M
Thank you very much, thought I was losing the plot with uncle Peter telling me otherwise. N7GTX said:
Now I'm totally confused
Without phoning up Dom, does anyone know for sure if the graph he does for his rolling road, shows the BHP and Torque at the wheels or at the flywheel?
All these different rolling roads and 18% drivetrain losses with some graphs at the fly, and some at the wheels, doing me head in
The graphs that Jay (not Dom) produce are at the wheels so your fly figure will be significantly higher. I have spoken to him about your car (and others) during our many technical chats and your figures are definitely wheel based as are all others off their dyno. And he does use 15% drivetrain losses which he admits are somewhat conservative. Your car is running high boost and the output figures reflect that. He (Jay) is a very talented mapper, he'll get what he can out of an engine but won't risk breaking it. Without phoning up Dom, does anyone know for sure if the graph he does for his rolling road, shows the BHP and Torque at the wheels or at the flywheel?
All these different rolling roads and 18% drivetrain losses with some graphs at the fly, and some at the wheels, doing me head in
phazed said:
Humbug!
Dam confusing turbos...........
Ah, yes, can you just remind me what your flywheel figures are?Dam confusing turbos...........
I'm off to find a calculator to see what my tiny little 4.0 litre is (I'll bet Mac is watching this thread
). Now what is 355 x 15%? 
Edited by N7GTX on Tuesday 8th December 08:39
phazed said:
N7GTX said:
phazed said:
Humbug!
Dam confusing turbos...........
Ah, yes, can you just remind me what your flywheel figures are?Dam confusing turbos...........
I'm off to find a calculator to see what my tiny little 4.0 litre is (I'll bet Mac is watching this thread
). Now what is 355 x 15%? Bloody luvly, like
Edited by N7GTX on Tuesday 8th December 08:21
Edited by N7GTX on Tuesday 8th December 08:38
ClassiChimi said:
^^^^^
,,,hi Iain,,you have the powers turbo,,, tell me more please..
How long you've had it
How many miles
Any issues
Is it fast
It's got some power I can see that,,
Do I detect some interest here Alun? Seem to remember just a month ago someone saying they had more than enough and they were happy and not looking to go any further? ,,,hi Iain,,you have the powers turbo,,, tell me more please..How long you've had it
How many miles
Any issues
Is it fast
It's got some power I can see that,,
Hmmmmm....the trouble is, as Dangerousderek said, once you start this power one-up-man-ship, there's no end to it
It was fitted in April this year. It was finally mapped after running in 3,000 miles just after the Chatsworth meeting (Mac gave me a right bollicking so got it done straight away).
No issues so far other than the petrol tank seems to have sprung a leak but only above 3,000 revs.
Its probably too fast for me. My other half shouts all the time, 'don't even try it' (overtake 3 cars at one go), 'slow down' (very predictable) and the two annoying local Cerb owners call her "handbrake".
You just have to be prepared for a huge ejaculation up the backside at 3,000 rpm
ClassiChimi said:
Really funny post Iain, nah I'm not interested in turbos but I have a mate that is,,,
What's it cost again
I have Mbe, I have a fresh engine,,,, Im at Powers tomorrow,,,,,,, Doms licking his lips as I speak,, haha
If I had an endless supply of cash I'd go for it
Enjoy it for what it is Alun!What's it cost again
I have Mbe, I have a fresh engine,,,, Im at Powers tomorrow,,,,,,, Doms licking his lips as I speak,, haha
If I had an endless supply of cash I'd go for it
The temptation to make ever bigger numbers can be overwhelming sometimes, but if all you want is a nice driving & reliable TVR that still gets up the road like a scolded cat it's worth remembering... you've already got that
I've just added up what I've spent refurbishing my new house this year and could have easily had an LS conversion plus change with that money, but making a new and even better home for the wife and I must take priority over car stuff.
My advice would be to spend your next block of spare money on another awesome road trip and leave the turbos to others
If driving your TVR is what thrills you, then just get in it and drive it lots more
ClassiChimi said:
Really funny post Iain, nah I'm not interested in turbos but I have a mate that is,,,
What's it cost again
I have Mbe, I have a fresh engine,,,, Im at Powers tomorrow,,,,,,, Doms licking his lips as I speak,, haha
If I had an endless supply of cash I'd go for it
The engine and turbo cost more than the bleedin' car in the end What's it cost again
I have Mbe, I have a fresh engine,,,, Im at Powers tomorrow,,,,,,, Doms licking his lips as I speak,, haha
If I had an endless supply of cash I'd go for it
COG is right, I could have had an LS for what I've spent now. Drat and double drat. 
Yep, watch out for Mr D
His parting words after the remap were, 'once you get used to the power, we can fit bigger injectors and get a lot more next year.'
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