Hey guys, how good is the K27 Turbo for a b18c4 engine?
The goal is to achieve 400-500hp (5xx if possible) on pump gas

I already own the turbo, it's just a question if it's worth repairing it or just go with a different model/brand!
If so, I intend to rip off the actual wastegate to go with one into the manifold
Here's some pics

 

Unfortunately, in order to be able to make that type of horsepower number to the wheels, you would need something a little bit larger. Pump gas is not an option to make that type of power, even at Peak efficiency of 2.0 PR.

Even at Peak efficiency, this turbocharger is equivalent to about 52lbs/min (similar to a GT3076R. ) I do believe that you have the possibility to make 350 horsepower to the wheels, at most with 93 octane fuel, however it is not capable of much more than that. Even with an increase in intercooler efficiency. The GT30R family would do better with less work, (both on the turbo's ability, and the work required to make the K27 fit properly, regardless of housing.

That isn't to say that the K27 should not be used, as Blitz Japan years ago, used this particular turbocharger in their Top Fuel EK9 design, (before going to a K3T), and, if you can effectively retrofitted, would make a fantastic platform for a b18c4 Engine. Especially if you're looking for a quick response and staying with the stock displacement. It would be a fantastic runner for a road race or rallycross condition, as well as the street.

But trying to make large amounts of horsepower with this turbochargers start something you should try and established with this unit that you already have. You'll definitely need to remove the internal gate, weld the flapper door shut, and go external for best results, (depending upon your location and availability of parts, of course)

The video below From Top Fuel used 450bhp (about 340-360whp). More than enough for even a B18C4. The Esprit used 465bhp (395whp-400whp) for its run on Tskuba


The Esprit EK9 went to a GT3076R to do something similar and had even better results.


I hope that was at least a little bit helpful.

 

Thanks for the tip!! I work at a junkyard, so that's how I get this turbo! I want the car for street, drag strips festivals when available but i can't get E85 or any high detonation fuel! Well saying that it's equivalent to a GT30, I would go with the Garrett, since it's newer compared to the KKK and has more support nowadays! It was very informative, thank you so much for you humble anwser!!

 

@TheShodan I see the new spec K27 with billet compressor wheel is being used a lot in the diesel world to replace the OE-fitted HX35. This variant uses a 60x83 compressor wheel so will be equivalent to a HX40/HX35 Hybrid right ? I'm assuming the cast wheel K27 pictured here has smaller dimensions i.e. more inline with HX35 or GT3076?

 

Yep this turbo is great for huge diesels engines, since it came from an Mercedes truck OM906LA Euro 2! This one is featuring a 60/83.7mm Forged Milled Wheel, but it has a broken wastegate, so it needs to be repaired! And my question was spending money on another turbo rather than rebuilding it! TheShodan and most everyone else are recommending and newer gen Garrett series, since it's more efficient, and have a lot's of support in terms of tunes, and repair kits! Since I tuned my dad's m-td "rabbit" (mk2 golf) with a k24 turbo on a 1.9L and it's a damn mad turbo!!! It can pull 145WHP and 312Nm (+- 230lb ft) at 22PSI I just wondered how this big brother will stand up against high reving petrol engines

 

It's possible. But you still have to take into account of how the turbine wheel's size and profile to see how well the compressor wheel can adapt itself to different platforms. Do i think its worth the switch? I can't truly answer that. But you can try it..