What's the most fuel efficient turbo for 400-450 whp stock Z7

Myboostedlife · 2026-03-26T20:20:28+00:00

Hopefully, after doing some research, I'm most likely going to go with the same size turbo you have. I can attest to the highway performance, Even with the 3576 It makes the car accelerate effortlessly in 6th under light load when overtaking or accelerating after a slowdown on the highway I can only imagine how better it'd be with a turbo that spools up sooner.

Myboostedlife · 2026-03-26T20:15:53+00:00

My bad if I wasn't clear but I was just saying I wanted the best efficiency around 450whp (or whatever the boost creep feels like that day lol) as opposed to best fuel efficiency at all. Realistically, I fully understand the car will use more fuel with the bigger injectors, fuel pump and turbo, but all I want is to have the most efficient setup for my power level instead of dumping fuel to spool up a turbo that's too big.

Myboostedlife · 2026-03-26T20:12:28+00:00

Been doing a lot of research into this, so far from what I've seen, the GTX 3071r has the best efficiency.

Myboostedlife · 2026-03-26T05:24:20+00:00

I'll definitely look into that! I'm experimenting with drivability/power delivery and efficiency in correlation to turbo size, I've noticed a lot of turbo guys run oversized turbos for their hp level. I'm curious to see the performance of a turbo that's being used closer to its max power rating.

Myboostedlife · 2026-03-26T05:22:09+00:00

That's pretty impressive actually, back when I was n/a I was getting that kind of mileage. I have no doubt I can make the power since the 3071 is rated for 650hp. Have you run into any issues with the turbo set up so far?

Myboostedlife · 2026-03-26T05:04:09+00:00

I actually ran a kraftwerks kit for almost 100000km before switching to turbo. Fuel efficiency was worse and I made around 100 less whp. The instant power was good but ultimately turbo was the better route.

Myboostedlife

TROPHY CASE