I finally ordered the turbo I've had my eye on for a year...

[float_6969]

Any guesses on what my new toy is?

[tommey]

BW EFR!
Wich one is a little harder to guess, what's your power goal?

[float_6969]

Yup! The compressor cover is a dead give away, but that turbine housing is pretty distinct too. I bought the 7064. I wanted a smaller turbo, but that is the smallest T4 flanged twin scroll external wastegate turbo that they make in the EFR series. I also got the Full Race metal bypass cover (I guess the plastic ones have trouble at high boost sometimes) and I am having the turbine housing ceramic coated (2000°, silver, just like the picture). I'm aiming for about 400whp, but my standalone will limit me to less than 30psi of boost. I should still be able to hit that mark easily, but we'll see. I'm mostly worried about the 1200cc injectors I'm running w/E85 maxing out before I get to where I want. Detchwerks insisted they were big enough to get there, but we'll see.

[tommey]

I hope it performs as well as you hope, they seem to be really good turbos.

Regardless g the injectors I do not think you should worry.
As I mentioned in another thread my daily driver makes 472whp and 640nm at the wheels and that's on 1000cc injectors.

[float_6969]

Is that on E85 as well?

[tommey]

Yes, E85.

I personally think you should raise your power goal or go down in turbo size.

[float_6969]

Well down in turbo isn't an option, so I'll probably just make more power. I think the injectors will still be limiting for how much I can make, but it may be my MAP sensor. I plan on making as much power as I can, but 400 to the wheels and responsive is my goal.

[boost_boy]

Nice turbocharger Tuning will be key here, my friend. And actually with the SDS and those 1200cc injectors, you should be just fine for the power you desire. The responsiveness will be interpreted by you when you actually have all this stuff together and put some power to the pavement, but when you cross that point, let me know. A 400whp CA18DET is nothing to sneeze at and you are well on your way to such a set-up.

[dash]

As I mentioned in another thread my daily driver makes 472whp and 640nm at the wheels and that's on 1000cc injectors... on E85 ...on a little GT2871.

so that's not your monster ca21 build. What's the details on this one? No build thread?
ca18? cams? t2 manifold... stock? ext wg? stock intake? built block/comp ratio? ported head? ecu?

[tommey]

As I mentioned in another thread my daily driver makes 472whp and 640nm at the wheels and that's on 1000cc injectors... on E85 ...on a little GT2871.

so that's not your monster ca21 build. What's the details on this one? No build thread?
ca18? cams? t2 manifold... stock? ext wg? stock intake? built block/comp ratio? ported head? ecu?

No its actually an SR ( I tried to leave that part out so I did not get kickbanned from this section)

Stock cams, stock bolts, forged bottom and somewhere between 9 and 10:1 compression ratio.
Reinforced block (not sleeved).
Stock untouched manifold, GT2871R at 2 bar boost.
1000cc ID injectors.
Nistune.
Z32 gearbox modified as described iin another thread.

I have made similar power on CA also, and I am not a big SR fan anyways.


The diesel block CA will hopefull make more power, the turbo I'm using on that is a little bigger and should handle at least 3 bar of boost .

[float_6969]

Unless you come in here saying CA's are crap, we don't really care.

I'm too lazy to look, what's the OD on the turbine of the GT2871? Is it comparable to the 7064?

I'm mostly worried about it being too laggy, but we'll see how the HKS's deal with the top end. If I can rev it out and keep a decently wide power band (4K-8K) I'll be happy. If it's too laggy, I'll break down and have a twin scroll manifold built that places the turbo in a better spot so I can use a smaller turbo, but that's an extra $2K+ that I didn't want to spend if I could get the HKS manifold + this turbo to work the way I wanted.

[tommey]

53.85mm seems to be it, about 10mm smaller then the 7064.

[float_6969]

Hmm. And was that a single scroll turbine, or a twin? What flange? What was the A/R? It's hard to find good turbo performance history on the CA18.

Another thing I don't think I've mentioned is that i have a CPC plenum. He insists there is no loss in bottom end with this manifold and it helps spool time, so we'll see what effect that has as well.

[tommey]

T2 single scroll .86.
It seems that this turbo is not as common in the US as it is here.
Often, the reason why you get faster spool with a twin scroll is because they are smaller at the same A/R.

I look at the Evo guys when i try to find experiences with turbos, the 6466 wich i am going to run on the CD21 is making great results on those engines but there is almost no Nissans that run them.

[float_6969]

Yea, I've been looking at Evo and Miata info mostly to try and find documentation of effects. The Evo crowd has ZILLIONS of dyno's floating around. That's true about the A/R's as well. My understanding is that the A/R doesn't take the divider into account. If the divider took up no space, a 1.00 A/R twin scroll would behave like two .50 A/R housing, put together in a single housing. Since the divider DOES take up space, it's even less than two .50 A/R housings. When you look at it that way, a 1.05 A/R turbine housing doesn't actually sound that bad. My guess is it will behave more like a .48 A/R housing.

[tommey]

With correct tuning and playing with timing you should achieve your goals.
I don't think you should worry about that.

[float_6969]

Yea, with adjustable cam gears and a standalone, I think Ill be able to get it to spool in a reasonable amount of time.

[themadscientist]

Not an S300SX? Boo!

[float_6969]

LOL! That's a bit big. I was actually considering the S200SX w/the .83A/R twin scroll turbine housing, but the guy at full race said this would spool faster.

[mdb4879]

It's been a while since I've looked, but when I was on the hunt for the fastest spooling T2 to make 400whp I came across quite a few people running the 2871r with a 0.86 turbine. I did, however find one or two people running the 2871r with the 0.63 turbine housing. Most people make about 360whp with those, but this guy had the the stock manifold and the turbine housing extrude honed and hit a bit over 400whp on pump gas.

We've talked about extrude honing the stock exhaust manifold before. Why not take it one step further and extrude the turbine housing as well? I'm sure on E85 with the compression bump you'll have you could hit 400whp no problem. Although if you've already bought the other turbo it may not be worth it to back.

[float_6969]

I actually asked the guys at full race about it and they said the casting was so good on the turbine housings on the EFR turbo's that I wouldn't see any gains. I still might send the manifold off though. The HKS manifold is a pretty rough casting.