Mk5 specific results from the JKM RR day on 7th March 09

[RobGTI]

I've since the original graph that I refer to added a Dbilas intake so that should see a better top end also, well as least it did on my butt dyno

[RedRobin]

Oh, and don't forget the other primary benefit of uprated intercoolers - check out the differences in the air temperatures between mine and Robins - and work out what I am on about. 

....On the printout, is "AT" the Air Temperature? Value 15 on yours and 13 on mine? What's it mean, please?

My AT was 11 in December and 13 in October - Both on JKM's dyno.

Thanks

Btw, T_T - I sent you an email (not PM)

[Mew]

No scanner, so unable to put up adequate scans. Anyway, here's mine:

They've been put up on the JKM site matey

http://www.jkm.org.uk/performance/GalleryGTI00309.htm

[RobGTI]

Forge themselves powder coated it I asked them to paint it black not powder coat it, they (John) claimed it wouldn't effect as he put it the "thermal efficiency" or warranty.

I'll might have to ask them about this bearing in mind what you say. 


I paid £650 all inc plus £50 for the powder coating.

With regards the S3 cooler, I'll see how I get on with this maybe I'll need one with all the powder on it

I reckon John (or you!  ) might have confused the powder coating vs paint.  When I initially spoke to Russell from Forge, he carefully explained to me that they will only flash spray a very thin coat of black paint on their coolers - and when they sent mine, the paint was very thin - but is standing up well to the winter without a single chip.  Maybe you ought to speak to Russell. 

Ok just had a phone conversation with John at Forge:
Here are the main points discussed:


1) The cooler is powder coated. Russel at Forge speciifes that powder coating is to be a min of 0.1mm and a maximum of 0.15mm.
2) The powder coating is offered in place of the spraying as a) it gives more of a uniform covering and b) it will not flake.
3) Forge (Chris) has run back to back tests with powder coated and non powder coated coolers and found no signifcant effect on the cooling. (less than 1 degree c loss)
4) Anodising was considered but not chosen as it would have weakened the weave of the aluminium.

[Egbutt Wash]

You never seem to get a duff engine, way below the norm.
VW's turbo 4 pot is a beaut.

[Hurdy]

There are one or two minor silver bits peeping through, but all-in-all it is holding up quite well

....Talking about your hair is bit off-topic isn't it Hurdy?

LOL

You're nearer the truth there than you think

[stealthwolf]

They've been put up on the JKM site matey

I know but I deliberately did them in excel. My car's been on the same RR twice, stock each time. The graphs from the second run are on a different scale to the first run so you can't adequately compare, which is why I did them in excel - for comparison reasons. Secondly, JKM have shown only the bhp/torque curves and not the bhp/afr:p plots which I've also analysed.

[Mew]

Touché!

[Teutonic_Tamer]

So does anyone have any comments on my second graph - particularly my air-fuel ratio?  Because mine does seem to drop off, yet still makes good torque and power at the top end?  

Only poser I can think of is whether or not the engine moves into stratified mode during a power run at some point

Huh - it shouldn't be doing that.  Stratified mode only happens under light engine loads at part throttle.  At WOT it should be on full 'rich' settings - and that is what is happening.  At the start of the run, the mixture is nearly stoich, but from 2,500rpm, starts to richen up - ending up at around 11:1.  Jim did confirm that our FSI engines run rich (as does my RS4) - but I just wondered what the 'blip' at 2,500 was about?

[Teutonic_Tamer]

No scanner, so unable to put up adequate scans. Anyway, here's mine:

I would still state that differences in temperatures and humidity can cause those knids of differences.  Take your 1st graph, for both the red power curve and the blue torque curve - on a cooler day, the dotted line is producing slightly more power slightly earlier in the rev range - but as the manufacturers stated maximum power is achieved - those two red lines meet up, delivering roughly the same max power.

The AFR (blue) on the second graph is more interesting - particularly at low revs.  Maybe it is a quirk of JKMs rollers which give a slightly unusual reading when first starting the power run.