AAN into Ur quattro, 400-450 Bhp Target

[DJones]

I was looking at a 7A exhaust cam, read all the threads and still not sure, a dyno graph of before and after and a before and after point of view from those that have done it would be good..

I have seen one somewhere but cant remember where....

I'm pretty sure that the summary was 7A exhaust cam introduced more lag with higher top end (which you would expect with more overlap) and the standard aan ex cam was obviously the opposite.

[20Vcqdriver]

I have seen one somewhere but cant remember where....

I'm pretty sure that the summary was 7A exhaust cam introduced more lag with higher top end (which you would expect with more overlap) and the standard aan ex cam was obviously the opposite.

I am amazed that just a few degrees and more lift has so much differnce, According to my data the cam opens at the same point but closes just 6 degrees later with I think it was 1mm more lift. Perhaps an adjustable gear on the exhaust cam could be designed to 'fine tune' for the best compromise

[prj]

Just stick with stock cams.
I've tried so many things, and always come back to the stock setup in the end for drivability.
At least under 500hp.

Yes, you might win some up top, but in reality, it's always a tradeoff.

[URquattroGus]

So, head is off and away for porting and reworking of the valve seats etc

Wagner manifold will be port matched too.

I am also going to look at having one of the intercooler end tanks re welded for a lesser angle to improve the inlet tract a little.

Once the head is fitted back on, should I go for a remap?

I was thinking about either buying an Innovate LM2 and checking AFR's or going to a local rolling road and getting them to do it. Presumably as long as AFR's look to be in order it should be ok and avoid yet another remap?

[quattrostyle]

to get the best out of the engine a remap is highly recommended after the headwork I'd say.

[URquattroGus]

Nice shiny head, now blasted, ported and skimmed, with valve seats given a multi angle cut too, cap caps polished also; thanks to JP aka JNL Racing He also ported and matched my wagner inlet manifold.















Can't wait to get to get this back on the car on and see what difference it makes

[diesel des]

Good lookin head. Will be interesting so see what difference it makes. But I still think there is a restriction in your inlet or intercooler system. I couldn't find a diff gauge that would be suitable for testing, the ones I had were 3 bar diff.

[URquattroGus]

Thanks for looking anyway des.

I have bitten the bullet and ordered an Innovate LM2 wideband logger (basic kit version with ODB), inductive rpm pickup lead and one map sensor.

This should allow me to log AFR's, rpm and boost.

If I add a second map sensor this will allow me to measure the pressure drop and actually log it.

something like that anyway

[newsh]

Awesome headwork, looks fantastic

[URquattroGus]

Well, I managed to get a differential pressure guage from ebay, it's a BMF at 6" accross, but looks like a quality item and should be easy to read!

Should allow me to get some easier measurements of the pressure drop between the turbo and inlet.

Surely air velocity come into it too?

[diesel des]

Sexy guage. Will be interesting what delta p you find.

[URquattroGus]

One last Jitter before the head is fully back on, how about lobbing in an RS2 exhaust cam??

I have searched on the subject, but still unsure!

I understand that a few other items need to be changed to do this?

[Jamo]

Are you having it remapped?

[diesel des]

I think stock cams work best for torque which is what you want I think? Rs2 or 7a exhaust cam helps up top, but hurts down low.

[Jamo]

RS2 exhaust cam does not hurt low down like the 7a cam

However the RS2 cam does seem to induce surge especially on garrett turbos, I would stick with stock.

You can confirm this with Doug at MRC