New Garrett Gtx2860R / 2863R / 2867R

[fatz]

6262 such a good turbo

[MagicMikeZ32]

New results from a fellowzedder with gtx2863's. First graph was previous. 2nd graph are the new initial dyno results.

Snapped intake cam (twice now) so he changed out all 4 cams for stock exhaust cams (solid, no VTC anymore). New mufflers also and even bigger throttle bodies (58mm to 62mm).

 

[iruvyouskyrine]

How does one snap a cam twice? Poor quality cams or improper installation/use?

[MagicMikeZ32]

Hollow

[afb312]

Any bent valves? Could be a very expensive experience... 

[MagicMikeZ32]

6 hours ago, afb312 said:

Any bent valves? Could be a very expensive experience... 

Survived both times luckily...

[Josh222]

A bit of a zombie thread bump but I seen these turbos being shown by Spectrum Motorsports Solutions here in Canada and though they were interesting. How much of a difference will having anti surge housing make vs just standard housings

[GTSBoy]

Besides reducing compressor efficiency?

[joshuaho96]

Seems like they do it on their single turbos for some reason. No idea why. Their smallest 42mm twin turbo setup for the RB26 doesn't use it and it has a compressor map that looks like this:

[Dose Pipe Sutututu]

Twins on a RB will always be shit, all of a sudden the Muricans and Canadians are experts with RBs.

[GTSBoy]

You should always have twin compressors on an RB. It's just that one of them should be a mechanically driven screw compressor and it should feed into the exhaust driven centrifugal compressor. Twincharge fo'lyfe!

[niZmO_Man]

You mean like BMW's TwinPower?

[GTSBoy]

On 2/23/2022 at 4:10 PM, niZmO_Man said:

You mean like BMW's TwinPower?

Um....no? That's just twin scroll single turbo, isn't it?

[hypergear]

The surge slot is not there to improve performance. It is because GTX28 comp wheel will bend its shaft in solid housings, the surge slot is made preventing that problem. It looks like a T51R style sort of a insert, should make some induction noises.

Anyway, Result from an earlier highflow we did. Red line is with solid housing, and blue is with antisurge slot. From a S15, internally gated on E85 fuel

 

 

Edited February 24, 2022 by hypergear

[joshuaho96]

On 2/24/2022 at 6:18 AM, hypergear said:

The surge slot is not there to improve performance. It is because GTX28 comp wheel will bend its shaft in solid housings, the surge slot is made preventing that problem. It looks like a T51R style sort of a insert, should make some induction noises.

Anyway, Result from an earlier highflow we did. Red line is with solid housing, and blue is with antisurge slot. From a S15, internally gated on E85 fuel

Any thoughts on the 42R compressor map they have? Seems pretty average to me but I haven't done a detailed comparison against others.

[joshuaho96]

On 2/23/2022 at 3:47 AM, GTSBoy said:

Um....no? That's just twin scroll single turbo, isn't it?

BMW in classic fashion decided that TwinPower could either mean a single twin scroll turbo or two turbos. I still have yet to figure out why they bother with twin turbos on the M3 when it seems obvious to just slap a bigger single turbo on the B58 and call it an S58.

[GTSBoy]

On 2/26/2022 at 7:55 AM, joshuaho96 said:

BMW in classic fashion decided that TwinPower could either mean a single twin scroll turbo or two turbos

Nah, they actually use both words, in both orders, to mean two different things. One order means twin turbo, the other means twin scroll single. They is classically f**ked over by marketeers. Engineers would tell them to go f**k themselves if they had the balls and the corporate power hadn't been usurped by the business school grads.

[joshuaho96]

On 2/25/2022 at 6:47 PM, GTSBoy said:

Nah, they actually use both words, in both orders, to mean two different things. One order means twin turbo, the other means twin scroll single. They is classically f**ked over by marketeers. Engineers would tell them to go f**k themselves if they had the balls and the corporate power hadn't been usurped by the business school grads.

From: https://www.bmwusa.com/vehicles/m-models/m3-sedan/overview.html

[Dose Pipe Sutututu]

On 26/02/2022 at 10:55 AM, joshuaho96 said:

twin turbos on the M3

Because it sounds cool on paper but in reality sounds aids (literally), a M3 with an exhaust sounds horrible. Kind of a reminds me of a stock turbo R32-34 with a loud exhaust, just sounds dreadful.

[joshuaho96]

On 2/26/2022 at 12:51 PM, Dose Pipe Sutututu said:

Because it sounds cool on paper but in reality sounds aids (literally), a M3 with an exhaust sounds horrible. Kind of a reminds me of a stock turbo R32-34 with a loud exhaust, just sounds dreadful.

The F80 even stock sounds awful even compared to an RB26. I don’t know how but BMW figured out the ideal exhaust setup to make that engine sound as terrible as possible.