Griff 500 transformed!

[Scoobysnack]

Cheers Sgirl

J

[kevinday]

SimonSparrow said: Hi,

Are these power figures at the rear wheels? Or at the flywheel? (if so, how are transmission losses accounted for?)

I have an 'old-school' Rover V8 (5 Litres in size) that produces 220HP at the rear wheels (on LPG). Just curious if technical advances and petrol could have bumped that up to 300HP!

I would assume at the flywheel. Calculation of transmission losses is based on various factors but would normally be around 10% plus 10bhp in this configuration. On that basis your own is around 255-260 at the flywheel which I would think is pretty good for an early Rover on lpg.

[Podie]

shpub said: The cold temp is probably what helped you make the power as the denser air means more power....

That's one way to piss on the parrade...!

[2 Sheds]

joospeed said: 335lbs torque ..most cerbie owners would kill for that figure .. any std cerbie making anywhere near to the claimed 360bhp makes under 300lbs peak torque yuo do get that extra revs to pay with though
PS 8-45pm? .. pah! .. luxury

PPS cheque's in the post tim ..

Cheers joolz
Yep a well sorted 5.0L Rover can make this kind of torque without a problem. but to get 340 bhp (Cerbera power ?) would cost about 10K !!
Tim

[griff2be]

S Girl - did you have the chip changed to a Tornado one or did Mark just work with the standard set up?

Ta

Andy

[RichB]

shpub said: The cold temp is probably what helped you make the power as the denser air means more power....

Hmmm Tim, Mark and I were saying exactly that - what you want is a high-pressure day in winter. Rich...

[SGirl]

RichB said: Hmmm Tim, Mark and I were saying exactly that - what you want is a high-pressure day in winter. Rich...

Definitely! But then again, the car had no obvious problem with fuelling in the warmer weather, it's only since the temperature's dropped that its little quirks (!) became apparent. So it had to be tuned now! Just as well really.

I might be wrong here, but doesn't cold air only make about 5% difference anyway?

[2 Sheds]

RichB said:

shpub said: The cold temp is probably what helped you make the power as the denser air means more power....

Hmmm Tim, Mark and I were saying exactly that - what you want is a high-pressure day in winter. Rich...

Yes i agree, despite corrections there will be variation. SGirls was strong compared with others that day.
Tim

[shpub]

I might be wrong here, but doesn't cold air only make about 5% difference anyway?

It depends... on the 520 the air temp inside the plenum reached 80+ degrees on a very hot day and I lost around 100 bhp as the ECU went into self preservation mode. The other point is that the temp correction is not necessarily done where the air intake is and you can get a real temp difference between what the ambient is and what the intake air temp actually is.

Even 5% on 300 is 15 bhp which is around 287 so the differences are appreciable. The key point is that it is better than when it went in.

Steve

[SGirl]

shpub said: The key point is that it is better than when it went in.

Yes, I agree. I'd really only taken the car in to get Mark to sort out its obvious fuelling problem, so the fact that he managed to find some extra horses from somewhere was just a welcome bonus!

[steve-p]

SGirl said:I might be wrong here, but doesn't cold air only make about 5% difference anyway?

It's between 2.5% and 5% per 10 degrees Celsius.

[dazzzer]

How can we contact Mark?

[2 Sheds]

dazzzer said: How can we contact Mark?

email [e-mail] or phone him 01694 720144 best 9-11 am weekdays.
He is very busy so don't expect to "get through" every time.
Tim