Ever wanted to add some extra hp's to your X5 diesel?

[M3_WC]

Originally Posted by JCL

I didn't have to look far to find a blown (non-diesel) engine using one of Terry's tunes. The details of one example were posted on e90post.com in the turbo forum, on the same day as your post, above.

Yup, one and only example.

Originally Posted by JCL

The users of various tunes have also had issues with broken half shafts, higher incidences of HPFP failures, injector failures, and so on. That isn't at all surprising to me given the amazing power they are getting out of the N54, and the resultant heat that power creates in the engine.

HPFP failures have nothing to do with tunes or piggybacks. Same can be said for injector failures. These are known problems on all N54's, including non-modified which the majority have no mods.

Broken half shafts are from people drag racing their cars. Drag radials plus sticky track can bust some half shafts.

Originally Posted by JCL

We could say that Terry was just unlucky that it was his customer that got so much attention. On the other hand, Shiv points out that Terry's tunes don't include ignition timing control, or the ability to read A/F ratio, or the ability to monitor timing/knock (other than using the standard knock sensor), and that Terry supplied a custom tune to an owner running 22 psi, 93 octane, meth injection, and non-stock spark plugs with a single electrode. Perhaps a blown engine isn't a surprise then.

You fail to mention. The car owner was running a prototype turbo upgrade, methanol injection. And was told to run higher octane gas, which he did not. Push the limits with 500+whp, then something can break with stock internals.