Turbo HP Ratings

[qws2000]

I wanted to know if you put a turbo on your car, but your motor is not putting out the horse power that matches the rating? Will it effect spolling or anything else.....

 

[coach]

How much bigger? It can affect a lot of things.

 

[qws2000]

intrested in the 6466..... on my current motor/with a the bottom end is a stroker?????

 

[coach]

Need more info.
PM Bison. He can match your combo.

 

[bison]

Turbos support mass flow. They dont make power. If they made power you could put a bigger turbo on and make more power every time. The cea 6466 supports a lot of mass flow. Way more than the TA66 which is a huge mismatch of compressor cover/wheel anyway. If you try and run a turbo that supports way more mass flow than your engine then you will usually wind up having boost control issues and you will be running the turbo closer to the surge line than if the engines mass flow potential was raised or you went with less compressor. Also the compressor, turbine, and ex. a/r have to complement the compressor/cover or it will leave potential on the table. If it were me id be running more cam, spring, and pushrod if i was going with a turbo like a 6466. Raising the engines efficient operating range will increase mass flow more than running higher pressure ratios with a turbo like a 6466. 70lbs/min @5400/28psi or 75lbs/min@5700/26psi after a new cam and other valvetrain components. Which would you rather have? What if you went up to 28psi like with the smaller cam and the engine is now at 80lbs/min? Thats the effect of more turbo/cam. About 110hp in that instance. Thats assuming you obviously have an engine that can take it and no hangups in the intake or exhaust and the car was actually tuned for it. Id be happy with a TA66 if it pushed my car to 132-133mph in the quarter under any operating conditions on just about any build. Thats about 64-65 lbs/min. With a 6466 it would take almost no effort to run that mph with what you have now and require a lot of wastegating but by switching cams and making the engine efficient at 5800-6000 rpm it would allow the potential of 6466 to really show and require less wastegating.

 

[qws2000]

Brian, I will email you direct I would like you to do a few things for me if you have the time....thanks

 

[turbojoe1]

Interesting. I see lots of different cover option out there. If I were to upgrade from a Ta49 to a 5858, with supporting mods, and with no loss of low speed power, with the right AR.

which compressor cover or hybrid would be most beneficial for a tall D/R tire street/strip 3400lb car that drives to and from the track? Of course with a custom stall to match.

Thanks Joe

 

[bison]

Interesting. I see lots of different cover option out there. If I were to upgrade from a Ta49 to a 5858, with supporting mods, and with no loss of low speed power, with the right AR.

which compressor cover or hybrid would be most beneficial for a tall D/R tire street/strip 3400lb car that drives to and from the track? Of course with a custom stall to match.

Thanks Joe

That wheel performs fine in a cover with a 5" diffuser. On an unopened engine it will keep making power with the boost well over 30psi. Garrett .63 would be the quickest spooling.

 

[turbojoe1]

I'm learning, but I have to ask what does mean via E cover vs S or H cover? I don't really care about stock appearing.

Thanks, impute?

 

[coach]

I'm learning, but I have to ask what does mean via E cover vs S or H cover? I don't really care about stock appearing.

Thanks, impute?

It's the inlet and outlet hose size. E cover is standard 3 in/2 out. S cover is 4 in/ 3 out.
I'm not sure what the H cover is.

 

[bison]

It's the inlet and outlet hose size. E cover is standard 3 in/2 out. S cover is 4 in/ 3 out.
I'm not sure what the H cover is.

There's more too it than the inlet and outlet sizes. "s" is usually 4"in 2.5" out. H is a Holset or a copy of a Holset 4" in 3" out commonly used by Precision on 67-76mm inducer compressor. The diffuser and nozzle area is largely responsible for how well a certain wheel will perform. There are 4" in 2.5" out that have large diffusers which was originally used by Garrett for t76 compressors. Most have smaller 5" diffusers that limit have limitations with larger wheels. The best t4 covers for larger wheels have 5 5/8 diffusers like the t04s04 and t76 covers. These covers have been to 1000hp with cast 76 wheels.

 

[JP112_89]

S is 4" in 2.5" out

H is 4" in 3" out I think

Joe

 

[turbojoe1]

Thanks, I saw that, but as far efficiency and effectiveness would one be more optimum over the other? If so the S cover makes more sense and would easily then mate to a 3" intercooler neck

Thanks Joe, *Input*?

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[bison]

Thanks, I saw that, but as far efficiency and effectiveness would one be more optimum over the other? If so the S cover makes more sense and would easily then mate to a 3" intercooler neck

Thanks Joe, *Input*?

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There needs to be a smooth transition exiting the housing and entering the intercooler plumbing. The long tapered transition hoses are the best. Like the old black ones that came with the Precision front mounts 14 years ago. If your intercooler is a flow restriction itself it will limit the potential of the compressor regardless of the cover.

 

[turbojoe1]

There needs to be a smooth transition exiting the housing and entering the intercooler plumbing. The long tapered transition hoses are the best. Like the old black ones that came with the Precision front mounts 14 years ago. If your intercooler is a flow restriction itself it will limit the potential of the compressor regardless of the cover.

I was thinking that work great with a stretched stock location intercooler with 3" inlet/outlet

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[turbojoe1]

What is the purpose of the holes around the inside of some inlet bells?

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[jasjamz]

They are called ported shrouds. They help reduce compressor surge.

 

[turbojoe1]

Ok thanks, so that would be an anti surge cover I take it.

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[bison]

What is the purpose of the holes around the inside of some inlet bells?

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They move the surge line left and up on a given compressor map.

 

[turbojoe1]

Thanks, I'm really digging the S covers, been reading, and I feel there is a little left on the table for more current ta49.

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