[boostkingMatt]

Not sure if any of y’all have seen these bad boys. Makes me want to pop my compressor covers off and paint them.

 

[GearHead_1]

Never known of a paint or coating that would stand up to the exhaust side temps of a turbo. Be interested to know how it holds up.

 

[boostkingMatt]

Never known of a paint or coating that would stand up to the exhaust side temps of a turbo. Be interested to know how it holds up.

Yeah true. I would be curious too. 11 blade compressor though? Golly. CRP said 6 blade is the best for what they’ve tested.

 

[GearHead_1]

I dunno, JetHot has held up very well on my headers but don't know that it's rated at turbo temps.

 

[Trav16]

Yeah true. I would be curious too. 11 blade compressor though? Golly. CRP said 6 blade is the best for what they’ve tested.

there’s a lot of options for the 3.5. Think I seen a 12 blade one a while ago.

 

[boostkingMatt]

there’s a lot of options for the 3.5. Think I seen a 12 blade one a while ago.

I think More blades have more transient response and less top end flow.

 

[Trav16]

I think More blades have more transient response and less top end flow.

Usually more than 7 blades will lower the amount of boost you can top out at but will spool much faster. They also can surge the easiest. I thought more blades meant less air. At least that’s what precision turbo taught me.

 

[boostkingMatt]

Usually more than 7 blades will lower the amount of boost you can top out at but will spool much faster. They also can surge the easiest. I thought more blades meant less air. At least that’s what precision turbo taught me.

Yes, that’s exactly right I believe. More blades means less air, but, more transient response. I mean, CRPs Powermax upgrades are 5 blade. There’s a reason they used a 5 blade instead of a 11 blade. 5 blade is going to have a ridiculous top end flow. They’re race only turbos pretty much. Also, less blades means they are louder. More blades are quieter with spooling sound.

 

[mass-hole]

I believe the blades on 11 blade(Which is what the Garrett GTX turbos have) get in the way of each other. The blades are so tight that the air can't backfill before the next blade passes once the turbo is flowing a lot of air.

But garrets new G-series turbos run 9 blade on the small end and what looks like 13 blade at the top end and they flow a good amount of air for their size. 50 lbs/min out of a 48 mm/60mm compressor.

It depends on the size of the compressor. If you have a huge diameter then the blades will be spaced farther apart and the turbo will spin at a much lower RPM. They always target a compressor tip speed of 540 m/s, so a larger diameter wheel will reach that at a lower RPM.

 

[boostkingMatt]

I believe the blades on 11 blade(Which is what the Garrett GTX turbos have) get in the way of each other. The blades are so tight that the air can't backfill before the next blade passes once the turbo is flowing a lot of air.

But garrets new G-series turbos run 9 blade on the small end and what looks like 13 blade at the top end and they flow a good amount of air for their size. 50 lbs/min out of a 48 mm/60mm compressor.

It depends on the size of the compressor. If you have a huge diameter then the blades will be spaced farther apart and the turbo will spin at a much lower RPM.

Exactly. CRP said 6+6 blade was the best. On my stage 4s, there’s a lot of room between each blade, allowing it to really cut that air and grab it.
Like I said with CRPs Weekend Warrior and Garrett Powermax upgrades they are 5+5 blade, 52mm inducer, which is just insane. That must flow a ridiculous amount of air up top. If I had a 3.5L I think I would buy the Weekend Warriors just cuz.