Another turbo setup for the M54

[ZetaTre]

I called Metric Mechanic from some question on the spark plugs for my supercharged Z3 and we end up discussing about turbo setup for a Z4 2.5. Some of the features we discussed could be:
1) stroke the engine to a little above 3.0, change all internals and dropping compression to 8.6:1
2) a single (but even discussed twin) turbo setup pushing a "conservative" 20psi
3) custom 6 speed tranny off of a 3.0 (apparently the Getrag 250 stock on the 2.5i would go kaboom)
This would bring the little Z in the ball park of 500 ponys... Although we haven't yet got into the details of price about $25K should do it: $10K for the engine, about $7.5 for turbo & tuning, another $4K for tranny and driveline and $3.5 in various things...

 

[Mr Whippy]

Yikes thats expensive.

All said and done you could probably buy a good 3.0 Z4 and ESS TS3 it for 390bhp, in the UK, for the same price of just doing that work

I suppose you'd really want a turbo 2.5 to justify those prices :driving: :evil:

 

[ovrkll]

or just buy an //M oke:
And if you want the 500 ponies, add the ESS supercharger and software for an additional 8K :wink:

 

[ZetaTre]

Well, not that fast, killa...

Firs of all this is a fully turbo built motor: the ESS TS3 has only forged pistons used primarily to lower compression and accommodate the extra boost. The MM version of the M54 has new pistons, rods, crank (I think it's the same as the M54B30, but with custom oil galleys to support the bearings when under boost), valvetrain & cams... The head too is machined to improve flow. It can easily rev north of 7,500 rpm... It has revised cooling & blueprinted oil pump...
All this allows the M54 from MM to support up to 25psi boost (at least that's what they suggest their customers to stop at) while the ESS stops at 15psi: pistons aside it's stock internals and pistons, are not a highly stressed component when going boost.

The ESS for the S54 it's a centrifugal, which, personally, is more of a dyno queen FI... The S54 has two things that IMHO makes it unsuitable for a centrifugal SC: it has a high compression and the rev limiter is high (both very well appreciated quality for an NA motor, don't get me wrong). If you consider a centrifugal SC boost deliver increase with (roughly) the square of the RPMs it means you get now boost down low... The MM engine would actually deliver 20PSI of boost basically from 3000RPM to redline which translate in a torque curve that an SCed S54 can only dream of...

But then again, as always when it comes to FI engines, it depends what one wanna do about it...

 

[Mr Whippy]

The ESS for the S54 it's a centrifugal, which, personally, is more of a dyno queen FI... The S54 has two things that IMHO makes it unsuitable for a centrifugal SC: it has a high compression and the rev limiter is high (both very well appreciated quality for an NA motor, don't get me wrong). If you consider a centrifugal SC boost deliver increase with (roughly) the square of the RPMs it means you get now boost down low... The MM engine would actually deliver 20PSI of boost basically from 3000RPM to redline which translate in a torque curve that an SCed S54 can only dream of...

I'd agree that a positive displacement setup for the S54 would be much better, or turbo, for torque lower down, but the centrifugal setup actually works quite nicely in keeping the S54 delivery fairly flat. Ie, it keeps a similar delivery to OEM, just MORE :evil:

Afterall, it's not like the standard S54 is gutless low down. I suppose it depends what you want in the end

Road monster or track monster

Just for giggles with that much money for a road car, I'd be wanting to slot an S62 in there and get ~ 480bhp of NA grunt out of it, with that epic V8 roar... cheap Z8.

Dave

 

[tsuiesque]

You have a lot of options for that kind of coin. Were talking $25k plus lets say $13k for your car. For $38k, I would get another car... Thinking Vishnu 335i if you want to play boost.

 

[Topshelf]

You have a lot of options for that kind of coin. Were talking $25k plus lets say $13k for your car. For $38k, I would get another car... Thinking Vishnu 335i if you want to play boost.

While it's a cool idea, I'm thinking along the same lines here. For $25k I'd definitely just buy a different car. I can't even fathom spending that kind of coin on performance mods.

 

[anderson]

horsepowerfreaks has started working on their non m kit, I think it will be sub $15000 (plus you can do the 3.0 conversion with a short block)

 

[Smokin]

sub $15000? Heck for a little over $2K you could have moved up from a 3.0Si coupe to an M coupe. Do any of these folks also include larger brakes, etc to balance?

 

[anderson]

nope, you bring the lsd, brakes, and new wheels for the +/- 500 rwhp. It is not for everyone there was a member on z4um (x88racing) who was heavily into racing and he said that the z4 would be perfect with around 360 hp

 

[Mr Whippy]

nope, you bring the lsd, brakes, and new wheels for the +/- 500 rwhp. It is not for everyone there was a member on z4um (x88racing) who was heavily into racing and he said that the z4 would be perfect with around 360 hp

CSL mapping and intake onto a Z4M then :evil: