Quote:
Originally Posted by LuckyX2
I'm no stranger to the simplify, then add lightness philosophy; just ask my missing radio, AC, PS and all the interior behind the front seats. I just don't see the 5lb saving as being as impressive as the increased performance of the turbo. I'll take a "free" extra 100hp over losing 5lbs any day.
I noticed you said similar performance again. I'll give it to you that performance was similar in steady state to the GTX line for the first gen EFRs like the 6758 but not with the 7163. The 7163 is like a 6758 that makes 100hp more at no cost in response. If the 6758 was similar to a 2871/2867/3071, then the 7163 definitely beats those by a significant margin and is not similar in performance.
Guess I'll just have to slap one on, make 400ft-lbs 4k to 7k and watch jaws drop  |
I don't know if it's that cut and dry, the 6758's spool up pretty damn quick. That said, I think the 7163's are pretty impressive. If this new turbine tech is a few (or more) percent improvement at low tip speed to flow ratio, then it might really push me to choose one.
The aluminum CHRA is available on all B1 framed EFRs now BTW, at about a $75 premium. I'll pay $75 to save 2 lbs off a turbo that's up forward and on the driver's side of the engine bay.
I'm still not a fan of the IWG. It's done well on the EFRs, but there HAS to be a power hit. Maybe it's small... but it's still there. In addition, there's been a ton of problems of running high boost consistently with an IWG, which is a classic problem since you have to give the WG flapper mechanical advantage over the canister so that you get enough flapper rotation for a limit amount of canister rod movement. Basically, the flapper is further out from the rotation than the WG canister as a general rule, so at high RPMs when turbine inlet pressure rises above boost pressure, your WG is pushed open even with your BC solenoid completely closed off. You can go push/pull, but it's kind of a PITA to tune around across a wide range of boost pressures since you're actively fighting TIP with boost in the canister but still need it to open and control boost.
EWG have much larger control areas, and thus higher spring pressure. They also have a 1:1 ratio of movement, so it generally takes A LOT of TIP to push one open when you want it closed with reasonable base spring pressure.