Turbo Questions Taken From Facebook
Recently we had a question on our Facebook Page from a four-wheel drive enthusiast looking at getting an aftermarket turbo kit.
He asked if basically a factory turbo could be worked to perform at the same level as an aftermarket turbo kit could, whilst in turn looking virtually looking the exact same as it was stock. Drew gave him a detailed explanation as to what our X11 program actually is as well as the benefits:
“This is what our X11 program is all about ! in short, the X11 series program identifies all the “weak points” of the factory turbo, and does a bunch of upgrades to make sure these are no longer a problem. The next step is to see what can be done to improve the flow capacity, without effecting the turbocharger longevity. The end result, is with the durability upgrades, and then the flow upgrades, we can typically gain a faster spool rate, and improve airflow up to 50% more over standard. On the vehicle, you can simply uses these as a standard turbo, but with much improved lifespan and reliability, or you can add all the other usual bolt-on type mods, such as exhausts intercoolers, and tuning, to really take advantage of the extra air-flow. The final “bonus” is that the turbo retains the full factory look, so it’s far less likely the fun-police will be causing trouble!
We can apply the X11 programme to pretty much every turbo, with usual mods like broader bearings, 360-degree thrust collars, turbine geometry and clearance changes and compressor wheel upgrades. Each model varies depending on exactly what is needed, but we have yet to find a turbo that cannot be improved !”
Phil then went on to ask about whether or not the turbo dosing sound will increase dramatically and this was Drew’s response:
“You might notice a bit more induction noise, but nothing extreme or annoying. Typically, the noise is dependent on the type of exhaust your running, so a straight pipe type system will allow a lot more turbo spool sound out, whereas the factory exhaust will keep it all dead quiet. One of the funny things we see is that people really like the whistle sounds from turbo’s but most of the time, the really loud whistles are usually because of a leaking system, or a turbo that’s out of balance.. Obviously this is not good for the long term reliability of the turbo, so as a manufacturer, we try to encourage people to fix these issues..
Occasional “Dosing” from the turbo is normal, especially when set at higher boost levels. This is the “flutter” type sound you hear on gearchange, or sudden throttle movements. This won’t hurt our turbos, but can cause very minor turbo-lag if you’ve got a large intercooler or pipework. A blow-off valve can help with this; which gives you the louder “woosh” type noise on gearchange / deceleration. For 4WD’s it’s usually better to route the blow-off valve output back to the airbox to stop any chance of dust or water entry, especially off-road..”
We encourage anyone to send AXT any questions they may have about our products or turbo’s in general!
We’re happy to help.