Originally posted by TaviaRS in this post

Thats why yours will be quicker

Whats yours geared to in 5th?

Question for you , 2 fans behind the rad, 1 little & 1 large. What are they (assume 1 cooling and 1 a/c) which is which or are they dual purpose? Had a problem this weekend that the large one packed up :( Damned cunning ecu though, if water temp goes over 100 it starts backing off the boost (if you keep it planted it will eventually deny you all boost, oh, and trigger the knock sensors).

Inlet temps are measured from the sensor on the cold side anyway. Measured with VAG-COM, I'll have a look and get the block number later (not near the car at the moment) and I've got a couple of piccies but can't upload until this evening.

5th gear i don't know or depends which box i put in it the fans do both colling and ac they are staged fans ie stage 1 big fan stage 2 little fan.

Losing .15 bar is huge in my opinion

I disagree. It was less of a loss than I was expecting. My car was mapped to take into account a bigger drop than that (more like 0.2 bar).

I have now checked and it is less than the .15 bar I thought it was, I have gauges which record the peak boost, it is actually a .12 bar (1.75 psi) loss. That compares reasonably to your loss of 1.5psi. Unfortunately, that figure may still not be accurate as I have a slight problem with cooling which I hadn't realised was there until this weekend. It would appear that I have no main cooling fan for the engine. May not sound like much but what I have found is that the standard ECU has the wonderful safety feature of reducing boost pressure when the engine temps rise ( I had max boost of 0.3 bar at one point). I'll need to recheck my figures once it is fixed on Thursday.

Yes, the core may be excessive, but my pipe runs are approx 1m lnoger than the standard ones in total length (0.4m outlet and 0.6m inlet) so they are short compared to the others currently available. I don't think its possible to get shorter pipe lengths than this. The core also flows incredibly well, considering the size of it (core excluding end tanks is 19.5 x 3 x 15). I think our initial guess of 0.2 bar was probably right for a "normal" core rather than this one. Doesn't seem to be any more lag than standard.

Also Speedy, you mention that you have a bigger outlet than inlet, but no pressure loss - you mention that expanding air cools - true, it does this because it is losing heat due to adiabatic expansion. If it's expanding, the pressure must be dropping - you can't have it both ways

Ok, you got me with the adiabatic expansion. However, I've always heard about that 25% rule. I can't prove it, but I needed to do this for fitment purposes anyway.

Regarding my initial loss of 1.5psi, it was a leak. I'd check all the hoses and clamps very well, since 2 of them ended up coming off at 1.4 bar. I also did some work to the 2" pipe to make it shorter.

I just hate pressure drops because I have 4-5 psi of it with just the altitude I have to deal with. You're losing more like 2+ psi which is the equivalent of 1000+m of altitude. It's also the difference between a T3 super 60 and a T3/T4E 46 trim at redline.

Speedy G