Holset Turbos, PART 3

[Slippi84]

Originally Posted by ceedawg

Man your question is hard to make out,is it even a question at all because the grammar is hard to understand!

Sorry I sent that last one from my cell phone. Which do you think would spool faster a divided housing with undivided manifold or if both were undivided?

[dsm-onster]

Undivided exhaust housings of the proper area will result in a faster spool in almost every case using a non-divided runner manifold versus using a divided housing. As I said, The exhaust gases see the sum of the turbine scrolls with a non-divided runner manifold. Almost always (especially in the case of holset) the divided housings sum up to a much bigger area than the other options for housings like the bep housings or cutting standard garrett t3 housings to fit.

A divided runner manifold with a matching twin scroll turbine of the same flow/power potential reaches boost threshold much faster though.

Match manifolds to turbines.

[Slippi84]

That's what I figured but it was worth asking before hand. I'm not in love with full boost around 5k na car that will see the street but I'm not gonna be able to run that much boost on pump. The small hoing seems o really like boost but I think the .70ar v-band may be the best trade off.

[JWoodley]

Whats the turbine wheel diameter on the HX40? I just need to verify this. I'm trying to find us a few more housing options.

[dsm-onster]

HX35/40 & HX40

[ceedawg]

Originally Posted by JWoodley

Whats the turbine wheel diameter on the HX40? I just need to verify this. I'm trying to find us a few more housing options.

The garrett divided housings should work well with some maching.

[andy4g63]

Originally Posted by dsm-onster

HX35/40 & HX40

I forgot, but HX-40 has a damn big turbine wheel. Especially compared to a GT35R. No wonder in a big housing spools a little later.

[Slippi84]

Originally Posted by andy4g63

I forgot, but HX-40 has a damn big turbine wheel. Especially compared to a GT35R. No wonder in a big housing spools a little later.

Andy bottom line for the street 95% of the time which housing would ou rather have?

[andy4g63]

Originally Posted by Slippi84

Andy bottom line for the street 95% of the time which housing would ou rather have?

Honestly, now probably I would consider 0.70 AR/T3. On the other hand, recently I noticed that my speedo is off by 7-8 MPH less than actual and that sometimes made me think the car was not moving as I expected.
Keep in mind I am old and lazy and sometimes definitely I should've kept the car a gear, even two lower. I think T3 0.70 AR, would be nice for you.

[Slippi84]

Originally Posted by andy4g63

Honestly, now probably I would consider 0.70 AR/T3. On the other hand, recently I noticed that my speedo is off by 7-8 MPH less than actual and that sometimes made me think the car was not moving as I expected.
Keep in mind I am old and lazy and sometimes definitely I should've kept the car a gear, even two lower. I think T3 0.70 AR, would be nice for you.

Yeah I got caught up in the spool craze of the .55ar but I forgot I'm high compression like you and that's why your rpms don't drop because transient response is crazy with hih compressio. So it might take me longer to get to a certain rpm but I wil stay in the weet spot the whole time after that.

[andy4g63]

Originally Posted by Slippi84

Yeah I got caught up in the spool craze of the .55ar but I forgot I'm high compression like you and that's why your rpms don't drop because transient response is crazy with hih compressio. So it might take me longer to get to a certain rpm but I wil stay in the weet spot the whole time after that.

Tyr and talk to TimG/I think. He is a N/T MODERATOR. The other day Dsm-onster was saying somewhere that he /TimG/ was getting 22psi @ like 5200RPM or so. Only I am not sure if his car isN/T or turbo. I am pretty sure you know him.

[Slippi84]

View Profile: TimG - DSMtuners.com
Tim has a 1g awd now

[ceedawg]

Originally Posted by Slippi84

Andy bottom line for the street 95% of the time which housing would ou rather have?

I would like to think that a divided 14 or 16cm housing(bigger than both a .55 and.70AR

housing) with a divided exh mani would spool up faster than a .70AR housing,would

spoolup almost similar to a .55AR housing and will most of all have more top end and

better power all thru the rpm range than both the .55ar housing and the .70AR housing.

The 14 and 16cm housings I believe will be better all around.

[Slippi84]

Originally Posted by ceedawg

I would like to think that a divided 14 or 16cm housing(bigger than both a .55 and.70AR

housing) with a divided exh mani would spool up faster than a .70AR housing,would

spoolup almost similar to a .55AR housing and will most of all have more top end and

better power all thru the rpm range than both the .55ar housing and the .70AR housing.

The 14 and 16cm housings I believe will be better all around.

Forgive my ignorance but I noticed that sometimes people reffer to housing by ar and t3/t4/bolt on but where do the 14/16cm housings come into play. IS that what holset puts on there to begin with?

Bythe way I already have a manifold and it's not divided. I could weld a dividerin there but just doesn't seem worth it.

[dsm-onster]

Welding in a divider is not really an option. Because the 1 & 4 runners need to be coupled to one side. Then the 2 & 3 runners need to be coupled to the right. The whole manifold will have to be butchered for you to do this. Better to start off with a new manifold altogether.

TimG runs a 1g turbo now. And he runs the stock 12cm holset housing with an undivided manifold. That is why his spool is slow. But because the housing is in effect larger, it has good topend from the logs.

I still say go for the small bep housing, if you can get it with a t3 inlet flange. The hx40 turbine is just so efficient. The flow is there and the spool is leaps better than a gt35r with a similar undivided turbine housing. Remember 650whp, hx40, small bep housing!

But, the .70 a/r housing is likely going to yield higher pumpgas numbers.

[Slippi84]

Originally Posted by dsm-onster

Welding in a divider is not really an option. Because the 1 & 4 runners need to be coupled to one side. Then the 2 & 3 runners need to be coupled to the right. The whole manifold will have to be butchered for you to do this. Better to start off with a new manifold altogether.

TimG runs a 1g turbo now. And he runs the stock 12cm holset housing with an undivided manifold. That is why his spool is slow. But because the housing is in effect larger, it has good topend from the logs.

I still say go for the small bep housing, if you can get it with a t3 inlet flange. The hx40 turbine is just so efficient. The flow is there and the spool is leaps better than a gt35r with a similar undivided turbine housing. Remember 650whp, hx40, small bep housing!

But, the .70 a/r housing is likely going to yield higher pumpgas numbers.

Exactly and I am limited as it is. I want good pump gas numbers. To be honest a street car that makes crappy pump gas numbers and grest race gas numers is useless. I run 93 93% of the time why tune and build for the 7%. I'll probably only be able to tune for like 15psi and I don't think a .55ar will yeild enough power at that boost level.

[1gDSM4g63]

Originally Posted by Slippi84

Exactly and I am limited as it is. I want good pump gas numbers. To be honest a street car that makes crappy pump gas numbers and grest race gas numers is useless. I run 93 93% of the time why tune and build for the 7%. I'll probably only be able to tune for like 15psi and I don't think a .55ar will yeild enough power at that boost level.

What are you saying and why are you deadbeating on a 0.70 A/R housing? Everyone has their own purpose for what they want to do and if the 0.55 A/R is not up to your standards then the HX35/HX40 is not the turbo for you.

[Slippi84]

Originally Posted by 1gDSM4g63

What are you saying and why are you deadbeating on a 0.70 A/R housing? Everyone has their own purpose for what they want to do and if the 0.55 A/R is not up to your standards then the HX35/HX40 is not the turbo for you.

WHose debating? If you check my profile and read what I have said you will understand. The .55ar comment is just rediculous and closeminded. There are a bunch of housing options as many have shown so you saying everyone without a .55ar should sell their turbo The .55ar isn't a good option forme because 1 I don't have a 4g63 so the whole bolt on thing isn't a advantage to me. Two even though I can get a t3 version the smaller ar housing takes more boost to make the same amout of power as a .70ar housing. I am high compression 10:5:1 and I can only run so much boost on pump before detonation because of this so the .70ar is a little better a choice I think for my setup. If I had a divided manifold I would do what ceedawg said with the 14cm divided housing but shoulda coulda woulda.

[ceedawg]

Originally Posted by dsm-onster

I still say go for the small bep housing, if you can get it with a t3 inlet flange. The hx40 turbine is just so efficient. The flow is there and the spool is leaps better than a gt35r with a similar undivided turbine housing. Remember 650whp, hx40, small bep housing!

But, the .70 a/r housing is likely going to yield higher pumpgas numbers.

Not saying that it is'nt but where is your info on the spool being so much better than a GT35r turbo with (XX A/R) divided housing? Are we talking about divided mani or an open mani as well?