Post your dyno curve here
Discussion
Discopotatoes said:
LongBaz said:
Running a little lean, so need to get it mapped as the was for the old engine.
I think theres a few more ponies to be had when its remapped and the fuelling is sorted.
Having ran 10.9 at Shakey I fear for my record this year.
Respect to Peter for those numbers 
I've resisted this post for years, but here goes... in for a penny and all that
, Somewhat different from me.... as usual!..... I'm going for the "best improver without bashing my wallet"... award
Here's 'Ol Wheezebag' (1996 4.0HC) on petrol 9 years ago with her flat cam and other issues
... and before I got to work 
And here's what she made a while back on LPG...
Basically a 35% increase in ponies burning half price taxi fuel all the experts in the pub will tell you means you lose loads of power, and I've made some significant improvements since this run. Better LPG injectors, better LPG vaporiser and better developed maps all serve to mean the car is noticeable stronger than when this graph was produced.
To be clear 'Ol Gasbag' is just 4.0 litre with the benefit of a Stealth cam from V8 Developments, a lightened flywheel, an ACT induction kit and a Canems engine management system..... but absolutely no head work
, I think it's fair to say she's hardly in a high state of tune compared with others. But I've still managed to push the horsepower from the sad asthmatic 188 ponies on petrol, to a healthy 249hp and 262ft/lbs on LPG..... while at the same time massively improving drivability, throttle response and engine refinement which to me was the biggest victory given how badly a good percentage of Chimaeras tend to drive.
Completely tearing up the rule book all the above power, torque and engine behavior improvements have also come with a huge improvement in the car's average fuel consumption (in cost terms), burning low carbon engine life extending LPG takes me from 23mpg on petrol to an average petrol cost equivalent of 45mpg on gas.
I know it's not 400hp so ridicule me if you want, but I hope you'll agree 249hp and 262ft/lbs still makes for a strong 4.0 litre on petrol especially given it's never had any head work, however... to deliver these HP & torque numbers on gas while averaging the equivalent of 45mpg transforms the already wonderful Chimaera into a truly practical classic to rival even the best 'improved for the modern age' traditional British sports car.
And if by some miracle there are any tree hungers out there
.... 'Ol Gasbag' kills way less dolphins than your petrol drinker too, you just wait till I get it on liquid hydrogen injection to create the worlds first zero emissions full fat V8 TVR 
I told you I was different
I've resisted this post for years, but here goes... in for a penny and all that
, Somewhat different from me.... as usual!..... I'm going for the "best improver without bashing my wallet"... award Here's 'Ol Wheezebag' (1996 4.0HC) on petrol 9 years ago with her flat cam and other issues
... and before I got to work And here's what she made a while back on LPG...
Basically a 35% increase in ponies burning half price taxi fuel all the experts in the pub will tell you means you lose loads of power
, and I've made some significant improvements since this run. Better LPG injectors, better LPG vaporiser and better developed maps all serve to mean the car is noticeable stronger than when this graph was produced. To be clear 'Ol Gasbag' is just 4.0 litre with the benefit of a Stealth cam from V8 Developments, a lightened flywheel, an ACT induction kit and a Canems engine management system..... but absolutely no head work
, I think it's fair to say she's hardly in a high state of tune compared with others. But I've still managed to push the horsepower from the sad asthmatic 188 ponies on petrol, to a healthy 249hp and 262ft/lbs on LPG..... while at the same time massively improving drivability, throttle response and engine refinement which to me was the biggest victory given how badly a good percentage of Chimaeras tend to drive.Completely tearing up the rule book all the above power, torque and engine behavior improvements have also come with a huge improvement in the car's average fuel consumption (in cost terms), burning low carbon engine life extending LPG takes me from 23mpg on petrol to an average petrol cost equivalent of 45mpg on gas.
I know it's not 400hp so ridicule me if you want, but I hope you'll agree 249hp and 262ft/lbs still makes for a strong 4.0 litre on petrol especially given it's never had any head work, however... to deliver these HP & torque numbers on gas while averaging the equivalent of 45mpg transforms the already wonderful Chimaera into a truly practical classic to rival even the best 'improved for the modern age' traditional British sports car.
And if by some miracle there are any tree hungers out there
.... 'Ol Gasbag' kills way less dolphins than your petrol drinker too, you just wait till I get it on liquid hydrogen injection to create the worlds first zero emissions full fat V8 TVR I told you I was different
Chimp that makes great reading, thanks for posting that. 
It's of particular interest to me as I have a 1995 400 that is currently standard in the engine department, but next week it is booked in for a Stealth cam and depending on the amount of any additional work required, subsequent Canems upgrade. Will be interesting to see how mine compares afterwards. I've been toying with the idea of the ACT induction kit, but might leave it until afterwards and see whether there are any meaningful gains to be had.
As a road car only, my aim is to get it to a proven 240bhp (as TVR originally claimed) if possible, with the added drivability/reliability of the Canems system. If I can achieve that I'll be a happy chap!
It's of particular interest to me as I have a 1995 400 that is currently standard in the engine department, but next week it is booked in for a Stealth cam and depending on the amount of any additional work required, subsequent Canems upgrade. Will be interesting to see how mine compares afterwards. I've been toying with the idea of the ACT induction kit, but might leave it until afterwards and see whether there are any meaningful gains to be had.
As a road car only, my aim is to get it to a proven 240bhp (as TVR originally claimed) if possible, with the added drivability/reliability of the Canems system. If I can achieve that I'll be a happy chap!
To everyone with a 4.0 litre, if I can achieve 249hp and 262ft/lbs on LPG then these figures should be your minimum goal if you're running your TVR on petrol.
This without any cylinder head work which in theory should be worth a further 25-30hp horsepower, essentially a set of decent heads would give me 275hp which would be in line with what TVR claimed an HC made. It would be interesting to see if I can achieve this on on LPG and I see no reason why I can't, whether I could get the engine to deliver the ambitious 305 lb⋅ft TVR claimed the HC made is another story altogether..... on any fuel!
Being realistic I'd be happy with 273hp and 285 ft/lbs as I feel this would be a
spot for me, I certainly wouldn't want to erode my very practical 320 mile touring range and average 45mpg petrol cost equivalent fuel economy.
This without any cylinder head work which in theory should be worth a further 25-30hp horsepower, essentially a set of decent heads would give me 275hp which would be in line with what TVR claimed an HC made. It would be interesting to see if I can achieve this on on LPG and I see no reason why I can't, whether I could get the engine to deliver the ambitious 305 lb⋅ft TVR claimed the HC made is another story altogether..... on any fuel!
Being realistic I'd be happy with 273hp and 285 ft/lbs as I feel this would be a
spot for me, I certainly wouldn't want to erode my very practical 320 mile touring range and average 45mpg petrol cost equivalent fuel economy.ChimpOnGas said:
you just wait till I get it on liquid hydrogen injection to create the worlds first zero emissions full fat V8 TVR
I told you I was different
I know a Belgian engineer (Olivier Vanhaelen) who got a Honda 1.6L VTEC engine to run on hydrogen at lambda=1 up to 4,500 or 5,000 (I forgot) rpm a few years ago usings some sort of pre-chamber design. Of course the goal was to achieve this for the entire rev range of the engine but I don't think he got there (yet). I told you I was different
Still, a lot better than the BMW and Mazda efforts, that achieved 2/3rds and half their engines' volumetric efficiency on hydrogen vs. petrol, respectively...
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