Help me decide on what HX40 to find

[JayRolla]

Im looking at getting an hx40. My profile is up to date. I will be running the bolt on housing with an o2 mounted wastegate.

I was going to get the 8/12 blade since its the easiest to find. But if I find a 7 or 6 blade Im wondering if I would loost a lot of spool speed or does it not madder. From what I see even the higher flowing hx40's spool about the same as the 8blade.

So should I look for the 6 or 7blade billet or just go with the 8 blade. Thanks.

 

[1gDSM4g63]

The non-billet have the same spool rate no matter if it's a 6, 7, or 8 blade. And as far as the lighter billet compressor it shouldn't make a noticeable difference. They are using the same A/R housing. What are your main intentions? The 6 and 7 blade compressor has 9 more lbs/min of flow if you want to take it to the limit on power.

 

[need2boostpsi]

billet equals durability not really spool, its not much lighter than the cast, i have been playing around with my setup for awhile but currently am running a t3 7-blade billet hx40. love the T3 housings btw.
to answer your question a little better, the 8-blade will be the fastest spooling hx40. there are some 56mm hx40s that come in 6 blades as well as a 60mm that comes in a 6-blade and 7-blade compressor inducer. if it says volvo on it chances are its a 56mm hx40. the 8-blade is easly found and has been proven to put down plenty of power. how far are you wanting to push your setup? 60 lbs/min is good for about 600whp on a dsm.

 

[JayRolla]

Well I will be making a little less HP per lb/min since I have a stock longblock, intake mani and I live in high altitude. Im flowing 38-40lb/min and would most likely dyno 330-350 uncorrected whp. Just cant make the power in altitude.

So my plans are to flow 55-60lb/min and push this long block over 500whp uncorrected and hope she holds together. So I will just look for the best deal and I dont think I need anything over 60lb/min really. But I wont hesitate to buy a 7 or 6 blade If I happen to find one.

 

[dsm-onster]

Spool speed is MOSTLY independent of compressor characteristics. They all spool in the same ballpark. The 8blade probably a little faster because of the wheel design, not the smaller inducer diameter. More blades is more efficienct. Higher efficiency converts more turbine work to boost instead of heat.

The 56mm 6blade hx40 isn't what you should be looking at. The flow potential is debatable. It would make sense that it flows about the same as the 8blade. But there's no map around here confirming. I personally believe it flows in the same ball park as the 58mm 8blade. I would really like to get a hold of one and actually run a temp sensor before/after the compressor to generate a real compressor map. Should be something that can be done in under 10 runs. . . But in your case get the proven 8blade it's common, and we KNOW it can flow over 800cfm.

If you're after 55-60lb/min. . .

You should be concerned with CFM ratings not airflow ratings. Everything you're doing has an airflow penalty in your atmosphere. 60lb/min will net about the same hp up there as down here. But, getting to 60lb/min will take MUCH more. I can see the 8blade hx40 pushing 55lb/min in your air. You'll of course need more boost than every one else, like with any other turbo. Seeing 60lb/min may be a little harder. You're atmosphere is about 11.5psia up there. The hx40 compressor map is rendered in 14.425psia. That's a 25% difference in density assuming you can get the same ambient temp into your compressor. I suggest the larger compressor wheel. You're getting only 36lb/min with an evo3 16g with the flapper held shut. I think you'll be right on the edge of what the 8blade hx40 can do. The 6blade or 7blade compressor would be good insurance.

If you're after 500whp . . .

The 8blade hx40 should be fine even up there. 500whp with decent cams and a good tune should require about 53-54lb/min.

 

[JayRolla]

Spool speed is MOSTLY independent of compressor characteristics. They all spool in the same ballpark. The 8blade probably a little faster because of the wheel design, not the smaller inducer diameter. More blades is more efficienct. Higher efficiency converts more turbine work to boost instead of heat.

The 56mm 6blade hx40 isn't what you should be looking at. The flow potential is debatable. It would make sense that it flows about the same as the 8blade. But there's no map around here confirming. I personally believe it flows in the same ball park as the 58mm 8blade. I would really like to get a hold of one and actually run a temp sensor before/after the compressor to generate a real compressor map. Should be something that can be done in under 10 runs. . . But in your case get the proven 8blade it's common, and we KNOW it can flow over 800cfm.

If you're after 55-60lb/min. . .

You should be concerned with CFM ratings not airflow ratings. Everything you're doing has an airflow penalty in your atmosphere. 60lb/min will net about the same hp up there as down here. But, getting to 60lb/min will take MUCH more. I can see the 8blade hx40 pushing 55lb/min in your air. You'll of course need more boost than every one else, like with any other turbo. Seeing 60lb/min may be a little harder. You're atmosphere is about 11.5psia up there. The hx40 compressor map is rendered in 14.425psia. That's a 25% difference in density assuming you can get the same ambient temp into your compressor. I suggest the larger compressor wheel. You're getting only 36lb/min with an evo3 16g with the flapper held shut. I think you'll be right on the edge of what the 8blade hx40 can do. The 6blade or 7blade compressor would be good insurance.

If you're after 500whp . . .

The 8blade hx40 should be fine even up there. 500whp with decent cams and a good tune should require about 53-54lb/min.

Thanks for the info. My goal is 500+whp but without cams. I wont be upgrading cams for a bit.

 

[dsm-onster]

Well. You'll need more boost to make up the difference . If the turbo can flow the volume for your goal then it can flow the volume. Cams or larger motor nets you more at lower boost. I think you should definately THINK about cams with a 50+ whp goal. You can get something like Delta regrinds for $200. There's another company mentioned in that thread that can grind crower 64413 (272/272) cam specs for you for $140.