Rotrex C38-91 Power Expectations - K20A.org .:. The K Series Source . Honda / Acura K20a k24a Engine Forum
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Old 11-08-2011, 02:44 AM   #1
Benson03
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Default Rotrex C38-91 Power Expectations

What are people thoughts on the power gain from a C38-61 to a C38-91?
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Old 11-08-2011, 11:45 AM   #2
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Default Re: Rotrex C38-91 Power Expectations

The max HP is raised from 550 to 650.
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Old 11-08-2011, 12:24 PM   #3
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Default Re: Rotrex C38-91 Power Expectations

Do you think there will be an 100hp gain from just changing charger on the same motor?
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Old 11-08-2011, 12:28 PM   #4
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Default Re: Rotrex C38-91 Power Expectations

at same speed,passing from a -81 to a -91 give you about 25WHP ;)
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Old 11-08-2011, 12:50 PM   #5
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Default Re: Rotrex C38-91 Power Expectations

Any guesstimates of the power gains from a 61 to 91 at the same RPM?
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Old 11-08-2011, 01:00 PM   #6
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Default Re: Rotrex C38-91 Power Expectations

Quote:
Originally Posted by Benson03 View Post
Any guesstimates of the power gains from a 61 to 91 at the same RPM?
i think around 75WHP if the engine,and the head,can accept the amount of air flow ;)
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Old 11-10-2011, 05:27 AM   #7
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I made 451std @12psi on a returnless fuel system on e85. On a 91.



I will be doing a return this time around.


Oh yeah it was on a k24 too
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Old 11-10-2011, 12:56 PM   #8
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Default Re: Rotrex C38-91 Power Expectations

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Originally Posted by ImportRacer2123 View Post
I made 451std @12psi on a returnless fuel system on e85. On a 91.



I will be doing a return this time around.


Oh yeah it was on a k24 too
Stock K24?

Would a motor make more power with 12 psi on a 61 or 91?
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Old 11-11-2011, 05:26 AM   #9
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No it was on a built hi cr k24. But maxxed out 2000cc injectors due to no return. I was running stock base FP.
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Old 11-11-2011, 04:47 PM   #10
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Talking Re: Rotrex C38-91 Power Expectations

Quote:
Originally Posted by ImportRacer2123 View Post
I made 451std @12psi on a returnless fuel system on e85. On a 91.



I will be doing a return this time around.


Oh yeah it was on a k24 too
sure you did..... lets run!!
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Old 11-11-2011, 06:45 PM   #11
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Default Re: Rotrex C38-91 Power Expectations

I would say yes, you should see a 100whp gain maybe more from upgrading from a 61 to a 91
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Old 11-13-2011, 03:04 PM   #12
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Default Re: Rotrex C38-91 Power Expectations

Cool, ill let you guys know the results when we get this car back together!
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Old 11-13-2011, 04:35 PM   #13
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Default Re: Rotrex C38-91 Power Expectations

has anyone tried one on stock k24a4/a8/a1?
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Old 11-13-2011, 07:54 PM   #14
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Default Re: Rotrex C38-91 Power Expectations

Quote:
Originally Posted by Benson03 View Post
What are people thoughts on the power gain from a C38-61 to a C38-91?
check out my video's on youtube stage2auto
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Old 12-18-2011, 09:12 AM   #15
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Default Re: Rotrex C38-91 Power Expectations

Quote:
Originally Posted by ImportRacer2123 View Post
I made 451std @12psi on a returnless fuel system on e85. On a 91.



I will be doing a return this time around.


Oh yeah it was on a k24 too
just how built is this k24? i was wanting to build something similar but probably using the c38-81 instead. Have you tried anything over 12psi yet? that should be crazy power!? Are you running a bov or wastegate?
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Old 06-27-2014, 10:00 PM   #16
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Default Re: Rotrex C38-91 Power Expectations

I'm running a c38-91 on a stock k24a2
And it maxed out at 420hp on 91 octane at 7,800 rpm

I was hoping to hit 550 on pump but probably not going to happen
Currently setting up the car for flex fuel

If you want big power then go turbo
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Old 06-27-2014, 10:52 PM   #17
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Default Re: Rotrex C38-91 Power Expectations

Quote:
Originally Posted by aztec1382 View Post
I'm running a c38-91 on a stock k24a2
And it maxed out at 420hp on 91 octane at 7,800 rpm

I was hoping to hit 550 on pump but probably not going to happen
Currently setting up the car for flex fuel

If you want big power then go turbo
Well there's got to be something holding it back somewhere.. The fact is rotrex say the c38-91 can flow enough air for 700hp. What's the rest of your spec?

There will probably be power to be had in other areas like fuel lines/pump/head/exhaust/camshafts/better fuel etc
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Old 06-27-2014, 11:11 PM   #18
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Default Re: Rotrex C38-91 Power Expectations

I think there numbers are exaggerated

My set up is a bone stock 06 k24a2
2 bosch 044 ran to -8 feed and a -6 return
And I'm using a pwr barrel air to water intercooler

But better fuel is a good start
That's why I'm trying e85
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Old 06-27-2014, 11:34 PM   #19
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Default Re: Rotrex C38-91 Power Expectations

Quote:
Originally Posted by aztec1382 View Post
I think there numbers are exaggerated

My set up is a bone stock 06 k24a2
2 bosch 044 ran to -8 feed and a -6 return
And I'm using a pwr barrel air to water intercooler

But better fuel is a good start
That's why I'm trying e85
What size barrel are you using? They are hard to size properly. It may be costing you some power too.

I also think the numbers are exaggerated to an extent.. Whatever I see as WHP I take a flywheel hp over here in the uk.
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Old 06-27-2014, 11:34 PM   #20
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Default Re: Rotrex C38-91 Power Expectations

Quote:
Originally Posted by aztec1382 View Post
I'm running a c38-91 on a stock k24a2
And it maxed out at 420hp on 91 octane at 7,800 rpm

I was hoping to hit 550 on pump but probably not going to happen
Currently setting up the car for flex fuel

If you want big power then go turbo
What PSI was that? and what SC pulley are you running?
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