C4 dyno location

Konstantin · Aug 20, 2008

hello there,
would any one could recomend a good and realistic dyno in UK ,I live in London and I am prepared to travel 2 to 3 hours
thanks for your coments

Konstantin C4

Alexander_Drobik · Aug 20, 2008

Hi Konstantin - as per email, the best I know of in this part of the world is Owen Devlopments - www.owendevelopments.co.uk/

I think they do a RR test without any other services eg ecu tuning - I would give them a ring. I would talk with their performance manager - Mark Harrison - who tunes my MOTEC installation.

Failing that there is surrey rolling road www.surreyrollingroad.co.uk, in Chobham, and they do RR test only for sure.

iangray100 · Aug 21, 2008

"Power Engineering" in Uxbridge ..they have carried out all my Dyno runs, 4 wheel and 2 wheel drive are possible.

its quicker to just google them.

Konstantin · Aug 22, 2008

Hi there

thanks for your help ,I end up at a place called quatro performance in Hayward Heath south to Gatwick, Kim is the man who run it, he tunes Audi turbo quattros to ridiculous figures the dyno is a German Maha made and it looks like it doesn't lie :
270 bhp , 301 Nm (crank) car has cup ,by pass, drill box + k&n ,Cartronic chip, air mass metring , LWF (no stalling issue with air con on once engine worm, 10 mm)
thank you for your help

Konstantin C4

PS do you think a C4 would have less power than a C2 ?

madmoog · Aug 24, 2008

All things being equal (the cheque is also in the post......[8|] ) yes, the power (at the crank) should be the same (unless a guru comes along to say that C4 had differant mapping), however it would not be at the wheels due to higher losses in the transmision; 2wd v 4wd.

Also there is DS Automotives in Aylesbury where the Turbo dynoday was back in May.

moog

Konstantin · Aug 25, 2008

Ian ,
impressive the rebuild, very interesting , did you had to grind the pistons and conrods for equal weight ?,did had the crank balanced as well ? the camshaft are sam profil now ,who did your ,I am thinking rebuilding myself as well.

Konstantin

Mark Elder · Aug 25, 2008

ORIGINAL: madmoog

All things being equal (the cheque is also in the post......[8|] ) yes, the power (at the crank) should be the same (unless a guru comes along to say that C4 had differant mapping), however it would not be at the wheels due to higher losses in the transmision; 2wd v 4wd.

Hope you don't think I'm bias! - but I think your measuring the power that the wrong point, therefore the loss is for the C2.

I'm talking about the 993 here (because I don't have the 964 figures), but Porsche state a slightly better 0-100km for the C4 over the C2. This is because, at the point the power matters, as it hits the road, you have more surface contact and better weight distribution. But we are only talking 0.1 sec and this is really the only point at which a C4 has any advantage!

iangray100 · Aug 25, 2008

Power figures from the C2 non RS, and C4 are the same, yes the C4 will absorb more transmission power than the C2, but the gear ratios between the two manual transmission are different to compensate for some of the transmission loss and also the extra weight etc etc . Only 5th and reverse have the same rations ....not really used on the 0-60 times ;-) .

But the official Porsche figures I have for 0-60 and 0-100 are the same for C2 (non Tiptronic and non RS) and C4 are the same ..at 5.5 and 5.7 respectively.

As for rebuilding the engine yourself ..go for it but:

1) Its not cheap in parts, and cost the same as a pro unit but you save the labour rate.. as a guide I spent £3500!! and over 100hrs, same as a pro on avereage.

2) Personally this engine its not for the faint hearted ....its an "engineers engine"..fully adjustable etc etc ..no dots to line up and off you go, you will need a few Porsche tools, in addition to a comprehensive set of workshop tools and quite of lot of "other" engine rebuild experience, before you tackle this unit. You also need to be comfortable in what your doing as it very easy to time the engine 180Deg out and you will only find this out when it its time start it ..the whole engine has to all come out again to fix it and hopefully you haven't bent the valves in doing it!!

Porsche OPC are no good for assistance and neither will the indipendants..you have to swim on your own for technical resource...its not a Mini or Ford Pinto ;-) but other than that I really enjoyed it and would do another one. But i'm mad and you might not be.

madmoog · Aug 31, 2008

ORIGINAL: Mark Elder

Hope you don't think I'm bias! - but I think your measuring the power that the wrong point, therefore the loss is for the C2.

I'm talking about the 993 here (because I don't have the 964 figures), but Porsche state a slightly better 0-100km for the C4 over the C2. This is because, at the point the power matters, as it hits the road, you have more surface contact and better weight distribution. But we are only talking 0.1 sec and this is really the only point at which a C4 has any advantage!

Mark,

Don't quite understand your first para, as at the crank power will be the same and due to transmission losses will be less at the road for the C4

However, having said that and as Ian points out gearratios even things out again, and in less than ideal grip situations the baence then could tip in favour if the C4.

For the purer driving experience a C2......... runs away to hide!

moog