Conditions under which these runs were made: 94 Octane, no water misters, outside air temperature in the low to mid 80F.
This was the first run of the day. After the car was warmed up we did one pull to make sure everything was OK. This also had the effect to warm up the car further to get more real world numbers.
In this run the car was equipped with the standard OEM N 75 valve for a 2004 car. Furthermore the stock OEM rubber turbo inlet pipe was used. Temperature inside the dyno room was
87.6 F.

Now for the boost plot, peak boost was 23.09 psi.

Next was a pull done with the N 75-K valve but we left the stock OEM rubber turbo inlet pipe on the car. Now the temperature had risen to 91.1 F.

Now for the boost plot, peak boost was 28.74 psi.
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Finally we proceeded to change the stock OEM rubber turbo inlet pipe by the newly modified custom stainless steel turbo inlet pipe.
Again on this pull the N 75-K valve was retained. Now before I go on to the graphs, we had a technical brain fart from the computer running the dyno. As we tried to do the pull which was followed by several others, the machine's rear mechanisism would not allow the car to accelerate normally. So the computer was shut down twice and rebooted. Needless to say the car and especially the air intake (I/Cs) got really hot and heat soaked. So we feel these numbers could have been higher. I intend to go back soon and do a more normal run with these same components on the car to get a better feel for their numbers. BTW, the temperature inside the dyno room had now climbed to 99.5 F and we saw intake air temperatures in excess of 70 C during the run!

Now for the boost plot, peak boost was 29.12 psi.

In conclusion which may not be easily seen on these graphs is that the custom pipe will give you more torque, Hp and boost sooner in you RPM range. In other words the engine response time is faster and better. The N75-K valve is definitely more aggressive and will take the MTM Stage 3, 1.35 bar chip (20 psi) up to 29.90 psi (seen on one run) and stabilise it between 25 psi at 3300 RPM down to 15 psi around 6000 RPM. I'm not sure if I want to keep this valve on the car and risk burning up the K04. I will talk to MTM in Germany and get an opinion from them. I decide at this time to keep it on the car while we do a shake down of the inlet pipe for a couple of weeks. Maybe the software and N 75-K valve have to adapt to each other. In the mean time I will take it easy, unless I race the car again... in two weeks.
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