6 Port Supra B58 Big Turbo Options

[ChrisIsIced]

Do you have any pics of ETS installed or in the process of installing it on your car, I’m trying to get an idea of if and where a high flow cat can be placed along the DP.

This is important to me as well. Im leaning toward the p2uned vband kit with g35 turbo. In IG messages they say there's enough clearance to add a cat but Ill have to figure it out when I get my hands on it.

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[i3igpete]

, but is there a "massive" difference between equal vs non-equal length?

It's been awhile since I watched the full race manifold test video from back in the day...



Obviously, yes, you can crank up the Boost To overcome poor breathing on the hot side. But why would you want to stress the engine more than you need to? Personally, I wouldn't want a single PSI or degree of timing more than necessary, to achieve a given target power output.

Yes, the video here is on a honda engine which historically have the best VolEff in the business. And it's true that when you use the hydraulic-electric analogy, a circuit with lower resistance will "feel" additional resistors (like the log mani) more. So the net effect on a low voleff engine will be less. But again, why are you letting the cheap stationary thing (manifold) dictate the expensive moving thing (engine)?

 

[rottmore]

Agreed. I can't find any evidence whether equal length matters enough to be double the cost. I am thinking the turbo itself matters more in the end but am open to learning more if anyone knows.

Well, i still would want as close to equal length if possible just to avoid exhaust pulse interference, turbulence or reversion but might be better to focus on the collector design and gate placement.

 

[DVMKV]

why would you want to stress the engine more than you need to?

I'm not necessarily comparing log vs equal - I'm more so referencing something like - https://jncmanifold.com/supra-b58-6-port-gen-2-t4-divided-single-turbo-kit/ to equal length. Log is likely to add the most additional stress, but what about JNC vs equal? It's not perfect, but it's not a log. I would imagine that difference is marginal compared to log vs equal?

 

[McBobby Jr]

I’ll chime in here, but unfortunately it does not appear there are any equal length or “equal length” (not quite equal length by the runner to the mm but close enough) top mount kits let alone manifolds for both the B58 and S58 platform yet. The only kit that looks close to equal length is the Vargas kit but that’s it. Generally for turbocharged BMW inline 6’s that go to a top mount setup, it is most likely an unequalized runner setup due to clearance, strut tower, and slanted motor.

At the moment, the turbo kits in production for the B58 that are “equal length” are the 4N, Walton, and Cobb Developments kit. Gen 2 flange would be needed for those kits to fit on a A90. No other kits come to mind except 1 manifold.

 

[ChrisIsIced]

I’ll chime in here, but unfortunately it does not appear there are any equal length or “equal length” (not quite equal length by the runner to the mm but close enough) top mount kits let alone manifolds for both the B58 and S58 platform yet. The only kit that looks close to equal length is the Vargas kit but that’s it. Generally for turbocharged BMW inline 6’s that go to a top mount setup, it is most likely an unequalized runner setup due to clearance, strut tower, and slanted motor.

At the moment, the turbo kits in production for the B58 that are “equal length” are the 4N, Walton, and Cobb Developments kit. Gen 2 flange would be needed for those kits to fit on a A90. No other kits come to mind except 1 manifold.

Ets, p2uned, and klm are not considered close enough?

 

[Funkjaw]

Watching this thread.

Particularly interested in a twinscroll setup that comes as close as possible to the OEM response (or dare I say even better?) while giving a far greater engine output.

 

[McBobby Jr]

Ets, p2uned, and klm are not considered close enough?

ETS would be the closest of the three, but they are not close to equal length especially the KLM manifold. It’s not a bad thing, considering the KLM manifold has achieved over 1500hp. Just off sound you could tell they are not equal length, a lot of top mount manifolds have the distinct VQ/VR pitch and lose some of the inline 6 smoothness.

 

[McBobby Jr]

Watching this thread.

Particularly interested in a twinscroll setup that comes as close as possible to the OEM response (or dare I say even better?) while giving a far greater engine output.

Well, here’s something. A twin scroll setup with OEM like response that is capable of far greater engine output. For those interested or curious, the only true equal length manifold on the market. T4 divided with stepped runners, quite the sound. Not a kit, but the manifold can be purchased from Alunox.

 

[rottmore]

Watching this thread.

Particularly interested in a twinscroll setup that comes as close as possible to the OEM response (or dare I say even better?) while giving a far greater engine output.

I'm a bit of a fanboy for the Borg's, but that's where i would invest my money into


.. I've got my eye on the 8474 black. Just trying to size it properly to achieve the impossible 1:1 pressure ratio at a steady flow state of 90lbs/min. I'll be at around at 3:1

 

[Funkjaw]

I'm a bit of a fanboy for the Borg's, but that's where i would invest my money into. I've got my eye on the 8474 black. Just trying to size it properly to achieve the impossible 1:1 pressure ratio at a steady flow state of 90lbs/min. I'll be at around at 3:1

I too love Bw EFR series. I have an 8374 on my large ported 13B Rx7. Great turbo, hasn’t let me down. 20psi by 3800rpm (which is really good for a rotary engine that’s ported to all hell). Can only imagine what it would be like on a torque happy B58.

 

[Twisted Tuning]

tubular or log manifold? Mind sharing pics and deets?

Looked at the big boost kit for the efr, their description says mani has an external WG port. But the turbo very clearly shows a factory EWG attached and arm to the internal gate.
Yet I find another pic of that turbo on some other sites and I see a normal turbine exit, not internal gate. Guessing big boost’s pics or description is for a different kit / turbo.

The efr does look to be a good match for B58 overall.

but I’m more concerned with the details on the whole package quality, fitment, completeness. Without needing to hammer cut and rig stuff to fit or go make new lines & hoses, would like to bolt something on, keep torque spike fairly low, and not touch anything for years until building the motor then perhaps a larger turbo.

This is a Tubular manifold. original DocRace top mount kit. Been on the car since 2019. my kit uses factory wastegate orignially. nothing needed to be cut or modified, it was bolt on kit.

 

[rottmore]

Been looking at a lot of turbo kit lately. Fastest spool for the 700-800WHP turbo is the Pure800>CES XONA kit (currently in development. It's a Garret turbo around 100lbs/min flow. EOS billet log manifold) = BigBoost EFR 8474> DAW FLOW X = OMEGA 65. I have not seen a dyno of the EFR8474 from bigboost on a GEN2 B58, only GEN1 B58. The 4N EFR 8474 has a tubular manifold. In theory, log manifold should spool faster than tubular.

 

[ChrisIsIced]

Do you have any pics of ETS installed or in the process of installing it on your car, I’m trying to get an idea of if and where a high flow cat can be placed along the DP.

Forgot about this thread/comment. P2uned is able to add a gesi cat in their kit for a little more money fyi. I ordered mine with a cat and the g35 1050 turbo. Will probably take another 3 weeks to receive at this point.

 

[teal.supra]

Edit: added a dyno graph

Wanted to share for anyone who might be interested.

This is the P2uned Series 1 Turbo Kit with the EOS Intake Manifold and Port Injection. I’m running a Xona 9564s, with two turbosmart wastegates and a Tial Q50 blow off valve.

This setup on E85 makes between 800-900whp at ~40psi.

1/4 mile trap speeds between 140-150, ETs between 9.2-9.8, 60-130 between 4.7-5.5.

Total cost before drivetrain modifications: $12,800

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