As well as developing products for new performance cars, here at Direnza we also offer upgrades for older performance models. Iconic cars such as the Mk1 Audi TT Quattro (225bhp).
What better way to prove our expertise in the field than by testing our products on the dyno at Tuning Developments in Warrington? For the TT, we focused on the following Direnza items:
- Three-inch Cat Back Exhaust System
- Front Mount Intercooler Kit
- Three-inch Decat Downpipe
Establishing a baseline
Before installing any Direnza upgrades, we strapped our standard TT to the dyno and established the stock performance.
Having rolled off the production line 17 years ago, it was no surprise to see power was down on Audi’s figure, the result 199.3bhp. That meant an average of 1.5bhp lost per year.
The graph below shows the stock power run results.
Three-inch Cat Back Exhaust System
Now it was time for business. First up, we fitted the Direnza Three-inch Cat back Exhaust System.
Manufactured from T304 grade stainless steel, and featuring a three-inch bore throughout, this system allows gasses to exit the turbocharger faster than standard.
Following three runs back-to-back, the modified TT achieved an average of 209.4bhp at the engine – an increase of 10.1bhp over our baseline figure. The graph below shows the exhaust run in blue overlaid with the baseline run in pink.
Aluminium Front Mount Intercooler
With the standard exhaust refitted, we then installed the Direnza Aluminium Front Mount Intercooler, complete with full aluminium hard boost hose kit.
With the extra large front mounted core, our car produced an impressive 208.6bhp – a 9.3bhp improvement over our baseline.
The Direnza Aluminium Front Mount Intercooler Kit provides much cooler intake temperatures, forcing denser air into the engine to produce more power!
The graph below shows the intercooler run in purple overlaid with the baseline run in pink.
Three-inch Decat Downpipe
With our car reverted to standard once more, now it was time to fit the Direnza Three-inch Decat Downpipe.
This pipe mounts directly to the turbocharger and removes the restrictive catalytic converter from the system to maximise power gains.
The free-flowing design ensures exhaust gasses are able to exit the turbo much more quickly than they would with the catalytic converter in place. The effect is noticed particularly at the higher end of the engine’s rev range.
Another three back-to-back runs saw our car produce an average of 218.8bhp – a whopping 19.5bhp more than our baseline!
The graph below shows the two runs overlaid with each other.
The complete package
Individual product runs complete, there was only thing for it – to see just how much power we could muster from fitting all three products together.
With all three products mounted to the TT Quattro, the dyno was brought to life and we waited for the results.
With the TT revved up, it laid down three more consecutive runs, producing an average of 229.1bhp. That’s an increase of 29.8bhp over our baseline and a fantastic result, especially considering no mapping has taken place on this car.
The graph below shows the power run with all parts attached in orange overlaid with the baseline run in pink.