RE: PH Fleet: Tested On The Rolling Road

[Chris71]

Can you remember what sort of figures the various Rover V8s usually produce Vixpy?

Do any of the 500s actually get anywhere near the 340bhp or whatever it is they're quoted at? I presume all the figures quoted in this thread are estimations of the flywheel figure rather than rear wheel horsepower?

[Garlick]

grahamw48 said:

Where are the torque figures for the session, and where are the 'at the wheels' figures ?

Do you have these on file Vixpy (for all cars)? I have left my graphs at home.

[Vixpy1]

Chris71 said:

Can you remember what sort of figures the various Rover V8s usually produce Vixpy?

Do any of the 500s actually get anywhere near the 340bhp or whatever it is they're quoted at? I presume all the figures quoted in this thread are estimations of the flywheel figure rather than rear wheel horsepower?

Chim/Grif 400 : 190 - 230
450 : 250 - 270
500 : 240 - 290

As standard anyway, depending mainly on how worn the cam is

[Del 203]

Vixpy1 said:

Chris71 said:

Can you remember what sort of figures the various Rover V8s usually produce Vixpy?

Do any of the 500s actually get anywhere near the 340bhp or whatever it is they're quoted at? I presume all the figures quoted in this thread are estimations of the flywheel figure rather than rear wheel horsepower?

Chim/Grif 400 : 190 - 230
450 : 250 - 270
500 : 240 - 290

As standard anyway, depending mainly on how worn the cam is

[noclue]

Garlick said:

I'm wondering why mine seems to be producing so much power now?

Prehaps this is a good example of why its worth paying that bit more for older peformance cars from dedicated specalists.

[Chris71]

noclue said:

Garlick said:

I'm wondering why mine seems to be producing so much power now?

Prehaps this is a good example of why its worth paying that bit more for older peformance cars from dedicated specalists.

Or perhaps in the past some little bloke in a grubby garage who doesn't charge three times as much for calling you sir down the phone and making you a cup of coffee when you come to the showroom dropped a hot cam in?

I stress this is not a reference to whoever Garlick bought the car off, but I found secondhand TVRs varied hugely from one-to-another and not always with correlation to who was selling them or how much they were charging. Likewise for servicing, price is no guarantee that they won't leave the car out in the rain to fill up with water and then fail to tighten the wheelnuts properly (leaving them to come loose at speed) as one expensive and generally well-regarded TVR specialist did to me.

Edited by Chris71 on Friday 4th June 13:53

[ZeroH]

Vixpy1 said:

Couple of Points

1) Pauls Chim is the best standard 4L I've ever done, and I've done about 200 of them (thanks for the cheque Paul)

2) The 460/470 I quoted for the M6 was because it was running normal unleaded, On super the V10 almost always does 500bhp.

Vixpy, what did the M6 do at the wheels ? Thx !

[Vixpy1]

ZeroH said:

Vixpy1 said:

Couple of Points

1) Pauls Chim is the best standard 4L I've ever done, and I've done about 200 of them (thanks for the cheque Paul)

2) The 460/470 I quoted for the M6 was because it was running normal unleaded, On super the V10 almost always does 500bhp.

Vixpy, what did the M6 do at the wheels ? Thx !

I'd have to check chap, it was certainly over 400

[dele]

Vixpy1 said:

Oh, and for those that wonder what sort of stuff we dyno when not doing power runs:

http://www.youtube.com/watch?v=b4x4YIoZS1A&fea...

And if you look in the related videos

http://www.youtube.com/watch?v=3RxyNTMNG_0

Someone driving a bent up Golf on the road, then racing

[300bhp/ton]

Vixpy1 said:

ZeroH said:

Vixpy1 said:

Couple of Points

1) Pauls Chim is the best standard 4L I've ever done, and I've done about 200 of them (thanks for the cheque Paul)

2) The 460/470 I quoted for the M6 was because it was running normal unleaded, On super the V10 almost always does 500bhp.

Vixpy, what did the M6 do at the wheels ? Thx !

I'd have to check chap, it was certainly over 400

Suspect my question may have got missed:

"Kinda curious, but do you use correction factors or are all the figures STD? Also are they metric or Imperial?

Cheers "

[Silent1]

dele said:

Vixpy1 said:

Oh, and for those that wonder what sort of stuff we dyno when not doing power runs:

http://www.youtube.com/watch?v=b4x4YIoZS1A&fea...

And if you look in the related videos

http://www.youtube.com/watch?v=3RxyNTMNG_0

Someone driving a bent up Golf on the road, then racing

That's nothing to do with vixpy though.

[Vixpy1]

300bhp/ton said:

Vixpy1 said:

ZeroH said:

Vixpy1 said:

Couple of Points

1) Pauls Chim is the best standard 4L I've ever done, and I've done about 200 of them (thanks for the cheque Paul)

2) The 460/470 I quoted for the M6 was because it was running normal unleaded, On super the V10 almost always does 500bhp.

Vixpy, what did the M6 do at the wheels ? Thx !

I'd have to check chap, it was certainly over 400

Suspect my question may have got missed:

"Kinda curious, but do you use correction factors or are all the figures STD? Also are they metric or Imperial?

Cheers "

Sorry chap, missed it.. There are atmos correction factors, but to what standard i'd have to look up.

[300bhp/ton]

Vixpy1 said:

300bhp/ton said:

Vixpy1 said:

ZeroH said:

Vixpy1 said:

Couple of Points

1) Pauls Chim is the best standard 4L I've ever done, and I've done about 200 of them (thanks for the cheque Paul)

2) The 460/470 I quoted for the M6 was because it was running normal unleaded, On super the V10 almost always does 500bhp.

Vixpy, what did the M6 do at the wheels ? Thx !

I'd have to check chap, it was certainly over 400

Suspect my question may have got missed:

"Kinda curious, but do you use correction factors or are all the figures STD? Also are they metric or Imperial?

Cheers "

Sorry chap, missed it.. There are atmos correction factors, but to what standard i'd have to look up.

Coolio

Wasn't trying to pick holes BTW (encase it came across like that). Just I guess I'm a bit a geek and find this sort of stuff interesting...

[Silent1]

Gaz. said:

carinaman said:

Big fan?

There's a bit on the BBR (MX-5 turbo and tweaked BMW Mini tuners) website where they mention not to rolling road forced induction engines due to the lack of air compared to when the cars are rolling.

Rolling road forced induction engines isn't a good idea?

Do you think that could be a bit of face saving?

The only way to really know what does what is to take it to the strip but a dyno gives you a good indication if they have nothing to do with the tuner.

You mean BBR who haven't ever produced a MINI that puts down the power they claim on either a strip or rolling road, you should see the custom manifold they produced for the R53, one person described it as fking mess and he was the nicest.

Charlie has RR'd mine and the intake temps didn't get anywhere near silly.

Edited by Silent1 on Friday 4th June 15:33

[Garlick]

Is this thread still going? Good.

Two hundred and forty. That's right 240 from a 400

As you were......

[neil_bolton]

Garlick said:

Is this thread still going? Good.

Two hundred and forty. That's right 240 from a 400

As you were......

Shouldn't you be spending far too much money maintaining your car? Is it for sale yet?

[300bhp/ton]

Gaz. said:

carinaman said:

Big fan?

There's a bit on the BBR (MX-5 turbo and tweaked BMW Mini tuners) website where they mention not to rolling road forced induction engines due to the lack of air compared to when the cars are rolling.

Rolling road forced induction engines isn't a good idea?

Do you think that could be a bit of face saving?

The only way to really know what does what is to take it to the strip but a dyno gives you a good indication if they have nothing to do with the tuner.

Agree fully. Also a dyno should be used as a tuning tool to allow you to load the engine, monitor and adjust while measuring AF ratios more than just the torque/power curves.

[anonymous-user]

300bhp/ton said:

Agree fully. Also a dyno should be used as a tuning tool to allow you to load the engine, monitor and adjust while measuring AF ratios more than just the torque/power curves.

So which dyno isn't used as a 'tuning tool' exactly?

[300bhp/ton]

yonex said:

300bhp/ton said:

Agree fully. Also a dyno should be used as a tuning tool to allow you to load the engine, monitor and adjust while measuring AF ratios more than just the torque/power curves.

So which dyno isn't used as a 'tuning tool' exactly?

????

[anonymous-user]

300bhp/ton said:

yonex said:

300bhp/ton said:

Agree fully. Also a dyno should be used as a tuning tool to allow you to load the engine, monitor and adjust while measuring AF ratios more than just the torque/power curves.

So which dyno isn't used as a 'tuning tool' exactly?

????

300bhp/ton said:

Also a dyno should be used

You seem to be suggesting that some aren't which I have just never seen?