astonmartian

So preference for 90’s slow spool nostalgia aside, what are you guys seeing as the new tech turbos? Who’s using good turbine tech? I was under the impression the gtx gen 2 were pretty top however I now understand that’s mostly a compressor side development as they still use older gt housings.

Borg Warner? That’s what the new p cars are running

TheRealSy90

Sure, you CAN do that. It's not the easiest option. You have to drive the car to a fab shop with no o2 housing/downpipe, or tow it with a truck/trailer. Just a lot more of a pain than a bolt-on option. Funny how the oem 5-bolt flange and exhaust seems to never have issues, only when people put aftermarket exhaust on with no flex pipe...

Also there's the risk of welding the v-band flanges and they warp and don't completely seal and leak exhaust. Which you won't know until it's installed then you're back to re-fabricating it again with another set of new flanges.

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TheRealSy90

BW EFR turbos, and Garret G-Series turbos (G25 etc)

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RalliartRsX

1) 5 20 min sessions in 100 degree heat WILL back out the 5 bolt turbine outlet bolts. They just simply do not have the thermal capacity to expand and contract and not loose clamping force after numerous heat cycles. Simple. Every single one of my exhausts have both a flex pipe and the tranny mount. That is not the issue. The not having flex pipe is manifested in pulling bottom mount turbos off the manifold, NOT the downpipe off the turbine housing.

2) If your welder is unable to weld a vband, then you have an idiotic welder. Buy a stepped v band. Clamp both v bands halves together. Weld. Zero concerns of warping as flanges will expand/contract at in the same axis and is constrained by the other vband flange.

Meh. I just think less things to clamp together (5 bolts with nuts and all sorts of headaches vs a single v band clamp). Simplicity is lost when you are fumbling around in the engine bay for 2-3 times the amount of time it would take to attach a single v band downpipe . That and I do not have to spend $2-$300 on Inconel hardware and fancy lock nuts and tabs.

QuickSpoolSR

I had one of those, wouldn’t even spool in 1st thinking there wasn’t enough load. Gtx2863r get that spool lol

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astonmartian

Yeah used boost quite low now I think it hits 12 lbs or so in 1st (looking at gauge on drift vid) without hammering it. Ballbearing > Journal bearing regardless

Def

I had stretched lots of M8 bolts on the 5 bolt turbine outlet housing. If you put a stronger bolt on it, it starts pulling the threads out of the turbine housing itself. Not much room to helicoil the threads either, which then makes the turbine housing itself just crack down the length of the threaded portion.

It's all fine on street usage, or even light track usage, but you start hammering on the car on track and the design shows that it's pretty marginal.

V-band outlets are way more robust. It's worth the effort to switch over if you drive your car hard.

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Mintyboy

Has anyone tried the new MX796?0 Comparison to the old M7960?

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e30gangsta

Sorry to bump and old thread. But the new ns400 from mmp seems to be what you're looking for.

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astonmartian

Very interested to see how these fair. Seems to be a mashup of the gtx chra and a few tidbits from other more modern (more than gt28) turbos.