GheyrodX - bigger, fatter, gheyer!

[scheides]

Aww, no more baby turbo? Looks sexeh, I love the ef-series compressor wheels.

[Murlo26]

Originally Posted by scheides

Aww, no more baby turbo? Looks sexeh, I love the ef-series compressor wheels.

Still looks baby to me I guess mine doesn't "look" much different lol.

[goodhart]

How big is the EF2 inlet? 2.5"?

[Kracka]

Originally Posted by goodhart

How big is the EF2 inlet? 2.5"?

Right about that. The EF2 reuses the stock turbo inlet elbow.

[JET]

Ooooh, shiny!

[Kracka]

MAP EF2.5 installed and tuned by Cobb yesterday while I was in Austin, TX for an event.

426whp
393wtq
27.69 psig (peak) holding a flat 26 past redline.

Still on 93-octane pump gas and stock cams! Solid gains over the EF2, but definitely lost some spool and response. This is with the 3" anti-surge cover, but MAP also sent me a 3" standard cover so I'm thinking if I swap that one on I'll gain back some spool and response. I'll talk to MAP about it and go from there. The car is definitely a beast for a DD, and I believe this is the farthest Cobb has ever pushed the stock cams and it's getting up there for pump gas numbers too. My previous results on the EF2 were 413/384; peak boost was right about the same, ~27psi. I think this is yet another good turbocharger option from MAP. While not replacing any of the current models, it's a good fit between the EF2 and EF3 as intended.

small chart:


big chart:

[Halon]

So it's the EF2 wheels, just different housings?

[Kracka]

Originally Posted by Halon

So it's the EF2 wheels, just different housings?

No. EF2 turbine wheel, but with a different compressor wheel that allows for the larger 3" inlet. The EF2 compressor wheel isn't big enough to warrant anything but the stock turbo inlet

[Halon]

So what size is the comp wheel?

[Kracka]

It's the EF3's compressor wheel.

[goodhart]

Tell Kevin or Calvin to get that shit up on the database!

[Kracka]

I'm hoping Kevin gets it up tomorrow.

I just got back from a pretty good drive and the car really does rip and pulls hard all the way to rev-limiter! It drives really smooth throughout the RPM range, I'm giving thanks to the anti-surge for that. I would like to get a touch of response and spool back though, so I'm thinking it would be ideal to give up a bit of that smoothness in the name of response and swap over to the standard cover. I'm questioning whether this turbo actually needs the anti-surge ports.

[scheides]

Originally Posted by Halon

So what size is the comp wheel?

Originally Posted by Kracka

It's the EF3's compressor wheel.

Yea, probably ~56mm compressor about the size of an FP Red.

My BBX had a stock compressor cover on it and was even bigger than this compressor setup so going back to a non-antisurge should work just fine. You have mivec to take away any surge that might 'just happen' from the conversion. Should add another 1-2% everywhere powerwise so you might just hit 430

Honestly I'm a tish skeptical if it will really help down low though but I really don't think it will hurt to try.

[awd-drifter]

That kind of power on stock cams and pump is very amazing. Very nice!

[Kracka]

[Tachyon]

Looks like it needs more boost thrown at it to better illustrate the difference.

[93gtpeater]

Look like the ef2 is better. The spool up doesnt look all that great on the 2.5

[Kracka]

I'm discussing with MAP and we have a few ideas on changes to try. This is why it's called prototype testing I suppose

[Murlo26]

Yea I agree, for the "ultimate street turbo" you are after Kracka I don't see the advantage with the 2.5. Hell, my EF4 is only about 200rpms behind your turbo up to 27psi and I am not even on full mivec (obviously totally different setups, but still).

EF2 ftw on your car. /pray new cover helps.

[Super Bleeder!!]

Hughes you should run that thing down the 1/4 mile someday. I don't really care about the ET but i'm curious as to what sort of trap speeds it would pull.