Duke

The only reason there's a power difference is obviously because of different boost levels during the runs.

jimbo1111

I believe the WG makes a difference only if the stock unit is bleeding. If a bleeding WG achieves a setpoint boost pressure while bleeding boost the turbo would most likely be out of it efficiency range doing it. The extra power from a new WG is coming from the added efficiency of a leak tight system. In this case there is a substantial differents.

lart951

Bingo, at leat someone got it right. In my first dyno sheet, I had setup my MBC at 18psi, the dyno was done with the shimmed stock wastegate (aka Ultimate guru pos). When the tial was installed and I went for the 1st test drive, my vdo boost gauge was showing 24-25 psi of boost and I had to do 3 more runs to adjust my MBC down to 18psi. My stock wastegate was bleeding 6-7psi I was running 24-25psi of boost in order to substain 18psi for a brief period. I hope that explanation helps.

schadenfreude

Yeah, I had a similar experience with my stock WG lart. I had heard about your experience, and so after installing the Tial (boost was 15psi beforehand) I wound back the Accuboost at least three turns, thinking I was being pretty conservative. After it got up to operating temp I started testing the boost level and the needle reached 18.5 - 19.0 before I had time to react and get off the gas.

I've noticed the turbo seems to be running a bit cooler now, I had so much heat soak before that my boost gauge would get very warm (as in almost warm enough to burn) after a couple of runs on boost. And after driving hard for a bit, or on a particularly hot day, the turbo would get just too hot and only start making 10psi. Now with the new WG it seems a lot better, haven't noticed any drop in peak boost yet and the boost gauge stays cool unless I drive it really hard

toddk911

So this was done on the exact same boost ?

Or you jsut did not make any adjustments and therefore the Tial was holding more to redline?

toddk911

"I've noticed the turbo seems to be running a bit cooler now, I had so much heat soak before that my boost gauge would get very warm (as in almost warm enough to burn) after a couple of runs on boost. And after driving hard for a bit, or on a particularly hot day, the turbo would get just too hot and only start making 10psi. "

Should certainly extend the life of a turbo being able to run much more effeciently.

GPF

lol

Do you really mean that you had a vacuum leak in the actuator side of the waste gate? If so that's not really an advantage of a Tial over a different type of WG, it's the advantage of having a WG in good condition!

Regards

Graham

docwyte

I had to turn my greddy ebc down from 48% to 30% when I swapped out my stock shimmed WG for a Tial WG...