T3 vs. Mitsu housing

[turbotalon1g]

Can anyone explain the differences/ pros vs. cons of these?
i am looking at turbo's about 50 trim sized and I have the opportunity to go T3 instead of bolt on, just wondering if i should.
To me if i have the same turbo, by going T3 I would lose spool but gain topend.

[scheides]

Two primary differences. One, you'll have to go to an aftermarket manifold. This will usually be a tubular-style setup, cost a lot, possibly crack over time, and more specifically yield more top-end power and sacrifice a bit of bottom-end.

The T3 hotsides you'd go with either a .63 or .86. Smaller = better spool, less top end, and vice versa. On a 50-trim on a 2.0, the smaller hotside will likely be ideal.

The bolt-on hotides are usually small-ish to somewhere in between, comparable to a .74 or so.

[turbotalon1g]

To be exact, I am looking at an HX35 in either a bolt-on .55 a/r or T3 .70 a/r.
Spool in bolt-on is said to be comparable to E316G but top end has been reported 50lb/min+, a friend of mine is seeing 49 lb/min @26psi.

[At-Least-It's-An-Evo]

To be exact, I am looking at an HX35 in either a bolt-on .55 a/r or T3 .70 a/r.
Spool in bolt-on is said to be comparable to E316G but top end has been reported 50lb/min+, a friend of mine is seeing 49 lb/min @26psi.

Looks like a HX35 compressor wheel or whatever flows 55-60 lbs a minute is what the general info after googling says. Thats more than that evo16g will flow but I highly doubt it will spool as fast. You know there will always be a trade off for spool vs. more flow... right?

If you hated the sc61 or whatever you had, you'll probably hate the HX35 too.

[turbotalon1g]

Yes I understand that, I guess what I am trying to do here is gain more top end, but not so much lag that comes with it.
I can say that there are times when I miss the 61.
That is why I am going for this, its along the lines of a 50 trim, which I think I will be happy with on the scm61 I had 20psi by 4200rpm.
I guess I would like this a bit earlier maybe late 3000s (3500-3900).
The bolton housing on a HX35 has dyno'd 500whp on a few cars. (yes we all know dynos are diff, but I have a baseline of this setup and want to improve a bit)

[Shane@DBPerformance]

A/R is just a ratio like trim, they don't mean a whole lot unless you are comparing to other housing in the same family. A .64 A/R T25 housing is tiny compared to a T3 .63 A/R. A T3 .82 A/R probably falls into line some where between a .58 and .68 T4 exhaust housing for spoolup/power. The PTE Mitsu .63 A/Rs are a tad bit smaller than the PTE T3 .63A/R. A Garrett GT42R 1.01 A/R divided T4 housing sounds huge, but it's really comparable to a T4 .68 undivided.

Spoolup can often more come down to cams, exhaust manifold design(huge), intake manifold, boost leaks, ignition timing, etc. The worst looking pile of shit true log manifold will usually spool a turbo the quickest, but have a big performance hit in the upper RPMs. Long runner fancy top mount manifolds no matter how perfectly they are design are usually laggy, which is fine if you need to make power from 8000-10000 RPMs.

I did one car with 3 different kinds of exhaust manifolds on the same turbo and saw 1000+ RPM spoolup difference from the worst to the best. eBay manifold spooled ok, but power was blah. Tried a fancy top mount, gained about 40hp, but 500 more rpms of lag. Tried a short runner tubular and made the same power as the top mount but spooled 1000 rpms quicker than the top mount and 500 quicker than the eBay.

I haven't had any BW or Holset turbos on the dyno that really blew me away as spooling way faster or making huge amounts more power. Some of those turbos are quite good, but not anything magic. The huge BWs(S372 and bigger) do spool pretty good for their size, but we aren't talking worlds different than others. It's hard to compare different cars, dynos, setups, etc over the internet to each other. The FP setups are usually noticably quicker spooling than comparable Garrett setups, but a lot of people use the FP exhaust manifold with them too.

[turbotalon1g]

^Thanks man. You've been a lot of help with a lot of questions.

Well I am thinking about keeping the FP Mani I have and just getting the bolt-on housing. I think anything I can do to keep spool would be good plus I only log a max on 38 lb/min now so even if I do get to 49 lb/min I will love it.

[Halon]

What about something like a 20G in a 7cm housing? Might be able to find a used one around for a decent price. Should still spool decently, give you a little more top end, bolt up to your mani, just have to figure out a WG setup for it.

[sleepydsm]

I'm gonna sound dumb, the when referenceing the 6cm^2/7cm^2 they are talking about the area of the turbo exhaust housing inlet, correct? Like for example, the stock 14bs are 6cm^2 and cool people use that mitsu gasket and port them to 7cm^2. Or am I retarded.

[asshanson]

You're thinking of the diameter of the turbine housing inlet, 6cm across, not 6cm^2 area.