Previously I’ve shown a dyno chart provided by The Turbo Engineers of their TTE 550 turbocharger for the B5 S4 and RS4. The TTE 550 is on my candidate list as a potential replacement turbocharger for my B5 S4 and the dyno chart comparison of the TTE 550’s versus the same car (B5 RS4) with K04 turbochargers was encouraging.
While the dyno chart was showing encouraging performance from the TTE 550 I was skeptical of the K04 turbo results being representative of what a K04 equipped car would produce when tuned for performance, the comparison numbers on the chart are apparently for a stock RS4.
I came across a dyno chart from the same shop, MRC Tuning, that was of a K04 equipped S4 in a seemingly tuned state. Below is an overlay of the K04’d S4 torque and horsepower curves and the TTE 550 dyno’s. It’s evident that the base dyno chart does not illustrate well the performance differences between the TTE 550 and K04’s in a typical state of tune on a modified B5 S4 or RS4. The differences in performance for tuned cars are not as large as they appear on the dyno chart alone.
On the other hand, what is impressive is how well the TTE 550 can match the K04 in low end performance with nearly identical torque and horsepower numbers below 3000 rpm. Above 3000 rpm the TTE 550’s have a solid advantage over the K04’s all the way to redline.
You may have noticed in the lower right corner of your screen a small box that says “Poll”. I am in the process of deliberating over what turbocharger pair to install next on my S4. I have put some of my thoughts in these pages, but I was interested in learning what visitors to this site would seek in an aftermarket turbocharger if faced with some of the limitations I am.
Update:
I’m moving the poll to this post so that I can expand the use of the polling feature.
This is the initial results of wiring up the TorqByte WMI controller in my S4 and then running the Aquamist Flow Sensor off the WMI controller.
TorqTune Initial Settings Output
There will be a full write up on the TorqByte CM5-LT water-methanol injection controller coming soon, but for the time being I am working on getting it wired up and verifying that the wiring and configuration of the TorqTune software is correct.
What is illustrated in the chart above is the WMI pump duty cycle, as specified in the TorqTune settings, the pumps output current, and the resulting water-methanol fluid flow rate. This is using the TorqTune software to trigger the injection while the engine is idling with no boost.
As can be seen, a moment after the current increases the water-methanol flow rate also increases, what I was expecting to see with a properly setup system.
