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Head work

Toms968CS

Toms968CS

PCGB Member
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I picked up my Club Sport from EMC on Monday from having it's vario-cam over-haul and it was given a clean bill of health by Kevin and co. A couple of oddities were noted - the heater thermostat has been rmoved (weird!) and the engine had the wrong grade of oil, apart from that I seem to have purchased a remarkably good car. Oh, and the cam timing was way out - I thought it was quick before - but now WOW :)

Thanks EMC
 
White car by any chance ??

I also had my head off and 'tweaked' by EMC a couple of weeks ago, it was dyno'd before and after with interesting results.
Before - 228 BHP at the wheels at 6500rpm
After - 239 BHP at the wheels at 6100rpm

Figures seemed high and they suspected a chip upgrade, I wasn't aware of any upgrade, and haven't had a chance to investigate this yet.
 
Yes, white with red decals and wheels.
Interesting results from your dyno session, I think the standard car came with 240bhp and I assume this is the fly wheel reading, so yours does seem rather good. Definately worth investigating and informing your insurance company if you find anything untoward.

After the EMC treatment there was a definite improvement in performance, but can't say how well for sure as I don't have a "before and after figure".
 
Sandy

IMO those quoted power figures are almost certainly at the flywheel -- the only way to get that amount of power at the wheels is by forced induction.

Also, the fact that max power occurred at lower rpm suggests that EMC did some good work on the valve seating, this being the usual place where power starts to 'leak' from our engines.

NB an aftermarket chip usually does more to smooth out power/torque delivery as compared to it's rather minimal increase in bhp.
 
Paul,

To be honest that would also have been my thoughts, but I was with the car and Alex during the first dyno run and apparently the figure was at the wheels, I have the print out at home.
I can re-check with them, but it's the same guys they always use and I wouldn't have thought there would be any doubt where the figure was from.
You're right on the valve seating at this was one of the jobs they did on the head.
Anyway as I said - interesting results, I might take the car to a local r/road and have it checked again in a few weeks.
 
Hi Tech Motorsport? They have a very very good reputation for helping to set up race car engines, however I also have my doubts about the actual figures from that dyno. Do a search around the net and you will see similar comments to those on this thread. My guess based on my own power curves from that dyno is a flywheel figure several to 10% higher than their wheel readings i.e. the wheel readings are several to 10% to high. You could always try another dyno and see what you get but its all a bit meaningless really, the important bit is the fact you got a solid improvement from the head work.

BTW Bob Watsons dyno is the one used by PCGB to test the club championship race cars, if ever their was a 'dyno of truth' for our cars then that one is the one to go to.
 
Neil, yes it was Hi-Tech Motorsport.
I agree the important bit is the actual change achieved, which was the main reason for the before and after on the same dyno.
I do plan now to try another dyno run using a local place, just out of interest more than anything, although not sure it'll prove anything.
 
Hi Sandy, sounds like your mint 968CS is coming along nicely . . .

I too had HiTech fettle my 968 Sport, a fair while ago now. Due to a faulty fuel pressure regulator and an iffy fuel pump she only managed a miserly 198 BHP @ 5800 RPM, once the fpr and pump were replaced that figure rose to 215 BHP @ 6100 RPM - both figures at the flywheel.

I'm not a fan of rolling road sessions to get figures for bragging rights (seen a lot of turbo cars blow-up at RR days in the past) but I'm all for using them to sort out running problems and to fine tune fuelling/timing etc.
 
Cheers Paz, yes getting there - I think my only gripe now is the seats.
The ones fitted look great but are non standard, and a bit on the narrow side for me, so looking into other options soon.
 
RECARO SPG XL will probably be a perfect fit for you, I used to have the regular SPG's in mine, they're uber comfortable.
 
Well did another dyno run last week at a local place in Aberdeen, which is apparently pretty accurate or even a little conservative.
Previous figure was 239 bhp at the wheels on the Hi Tech Motorsport dyno which I thought was suspiciously high, the new figure was 195 bhp at the wheels, with 229 apparently at the flywheel.
This would seem more in line with expectations and happy enough with that, the ambient temp was 22 degrees - yes in Aberdeen !!
There were 20 other cars there on the day, including 2 x Audi RS4s which put out 389/391 (414 expected) and a BMW Z4M which had 315 (338 expected), so many were on the low side.
Highest of the day was a slightly tweaked Nissan GTR which put out 650 bhp !!
 
Well done on the quoted figure Sandy, any idea on torque?

The Audi RS4 (B7) has a known issue with the FSI system coking up the valves hence they lose power after a few thousand miles, you'd be hard-pressed to find one with anywhere near 414 BHP (420PS).
 
In which gear? You can get a raft of differing figures between 3rd, 4th and 5th (and 6th!) and the coastdown figures / 'transmission losses' will differ greatly too. You can make a dyno say what you want within reason.....hence the 'sales' power run!
 

ORIGINAL: 944 man

In which gear?  You can get a raft of differing figures between 3rd, 4th and 5th (and 6th!) and the coastdown figures / 'transmission losses' will differ greatly too.  You can make a dyno say what you want within reason.....hence the 'sales' power run!
Click to expand...

I only know it was 4th gear on the recent run in Aberdeen, can't say which gear was used at Hi Tech.
Max power was at around 6500 on both dynos, is that not a bit on the high side ??
 
on a std car 6500 is about where the rev limiter cuts in but a lot of us use chips with higher rev limts eg 7100 or 7700 for the Promax chips.

my road car with a 7100 Promax chip made max power around the 6300 to 6500 mark, so similar to what you have experienced.
 
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