10 replies to this topic

[fischmama]

Just looking if anybody knows if the Holset HY35 or HX35 (12cm exhaust housing) can be mounted on a stock manifold (milled down or spacer for T3 compatibility) without hitting the rear mount?

If not, is there anybody that has modified the rear mount to make it work?

Now that I see that the 60trim is hitting it i figure the Holsets will too since their compressor housing is huge in comparison.

[lookforjoe]

Just looking if anybody knows if the Holset HY35 or HX35 (12cm exhaust housing) can be mounted on a stock manifold (milled down or spacer for T3 compatibility) without hitting the rear mount?

If not, is there anybody that has modified the rear mount to make it work?

Now that I see that the 60trim is hitting it i figure the Holsets will too since their compressor housing is huge in comparison.

If a 20g hits - I'd say without question a Holset of that size will probably need removal of the mount

Why go so large? You won't be making full boost at any streetable level, no?

[fischmama]

If a 20g hits - I'd say without question a Holset of that size will probably need removal of the mount

Why go so large? You won't be making full boost at any streetable level, no?

Yeah I figured, just wanted to see if anybody has done it.

I don't have any proven data but it seems that stock vw 1.8s can get them fully spooled around 3500-4000rpm which is fine for me.

Its not a daily driver neccessarly. Just looking to do something more unique and unusual. As you should know from my other thread I tend to go bigger than I should. I want this car to have a mean top end. The K24 gave me way too much low end grunt and I am just sick and tired of it. I don't expect the 60trim to last long and I always hear good things about the Holsets.

[T5wagon1717]

I am thinking of going the holset. They are good turbos, and can be gotten for under $100 in great shape where I live.
(humboldt) hella growers handguns diesels and sell their stock turbos on craigslist. Buddy got a brand new one for his 300zx for $70

[esundell90]

The HX35 is a mean turbo, but its big, I'd imagine you'd need to make more room.

They do have a nasty top end, I have a friend who had a MEAN hx35 setup on his 10v Audi 5cyl in a 88 5000. Thing spooled up 3-4k -ish in RPM's and would pull like a train. That motor is probably a better representation of what it would be like on a volvo 5cyl.

[URO_S60]

Just my two cents from using a 20G in the past on a stroked 4g63 (2.0L) to a 2.3L with 9.5:1 CR I still didnt reach full boost (22psi) on a built engine until ~4000 RPM's. I just don't see how these 5 cylinder low CR engines can build good boost like that with such a large turbo. I'm sure it can all work and all but by the time you meet full boost and it really moves the car you'll be shifting into the next gear. Why wouldn't you find something a tad bit smaller so you can get and use all the good effects of the turbo?

[fischmama]

Just my two cents from using a 20G in the past on a stroked 4g63 (2.0L) to a 2.3L with 9.5:1 CR I still didnt reach full boost (22psi) on a built engine until ~4000 RPM's. I just don't see how these 5 cylinder low CR engines can build good boost like that with such a large turbo. I'm sure it can all work and all but by the time you meet full boost and it really moves the car you'll be shifting into the next gear. Why wouldn't you find something a tad bit smaller so you can get and use all the good effects of the turbo?

I get your point and I would agree that a bigger turbo like a HX35 may not be a great turbo for these cars if you are trying to retain DD status; however, from a "racing/drag" perspective the turbo makes sense since evershift will bring me back to the mid 4k range in which the turbo will get back up to pressure in no time. Coming out of the hole is the only part thats gonna suck, but maybe not.

I don't want to start a topic whether this turbo makes sense for anyone to run. This is a pure project car, not a DD or anything of that nature. I am looking for a cheapish alternative to a GT30R-35R sized turbo.

[fastwagonhawaii]

I get your point and I would agree that a bigger turbo like a HX35 may not be a great turbo for these cars if you are trying to retain DD status; however, from a "racing/drag" perspective the turbo makes sense since evershift will bring me back to the mid 4k range in which the turbo will get back up to pressure in no time. Coming out of the hole is the only part thats gonna suck, but maybe not.

I don't want to start a topic whether this turbo makes sense for anyone to run. This is a pure project car, not a DD or anything of that nature. I am looking for a cheapish alternative to a GT30R-35R sized turbo.

Let me put it this way everybody forgets that they use this turbo in Sweden. With great success, granted there motors are BUILT and wit custom exhaust manifolds and what not. so just go for it but i would go with a custom exhaust manifold to lift the turbo up and out of the way of the mount. thats what they all do. actually there is a thread in this secton where they have a good example of how to use a big turbo.

Let me put it this way everybody forgets that they use this turbo in Sweden. With great success, granted there motors are BUILT and wit custom exhaust manifolds and what not. so just go for it but i would go with a custom exhaust manifold to lift the turbo up and out of the way of the mount. thats what they all do. actually there is a thread in this secton where they have a good example of how to use a big turbo.

http://volvospeed.com/vs_forum/topic/102822-t5-r-engine-build-next-one/

hopefully i did the link correctly.

[Fudge-Brownie]

I get your point and I would agree that a bigger turbo like a HX35 may not be a great turbo for these cars if you are trying to retain DD status; however, from a "racing/drag" perspective the turbo makes sense since evershift will bring me back to the mid 4k range in which the turbo will get back up to pressure in no time. Coming out of the hole is the only part thats gonna suck, but maybe not.

I don't want to start a topic whether this turbo makes sense for anyone to run. This is a pure project car, not a DD or anything of that nature. I am looking for a cheapish alternative to a GT30R-35R sized turbo.

If the Turbo will fit, go for it. These things can take a beating also. Being the car is a project car, you'll always have your foot into anyways when you driive it

I also have to add that its a seems to be an exciting time here on VS as so many of us are now going to the big aftermarket Turbos. Makes for good comparos of what turbos seem to be the best for our engines

Edited by dublin14, 07 February 2011 - 11:46 PM.

[Wagoneer855]

One of the main reasons I decided against a holset was slow spool characteristics with the huge exhaust housings. You'll have to find the smaller housings (9cm^2?) to make it at least streetable, but then the huge compressor is kind of put to waste.

But on a plus side, they're available to super cheap and they're extremely reliable turbos that with proper wastegates are happy at 5psi to 40psi.

[fischmama]

One of the main reasons I decided against a holset was slow spool characteristics with the huge exhaust housings. You'll have to find the smaller housings (9cm^2?) to make it at least streetable, but then the huge compressor is kind of put to waste.

But on a plus side, they're available to super cheap and they're extremely reliable turbos that with proper wastegates are happy at 5psi to 40psi.

looks like I had some wrong numbers stuck in my head. Yes I would be looking at a 9cm^2 housing (~0.65AR) instead of the 12cm^2 (~0.82AR), unless the bigger one is a better deal.

Well see, I'm not really interested to do a custom manifold right now. Thats why I brought this up.