"BADNEWS" makes 865AWHP @40psi

3SDNA

New member
Pipedreams":3c1vsekz said:
That gain would require alot more than raising the boost. 930whp at 36psi would equal ~267whp N/A. Then 40psi would equal ~1004whp. 1140whp is more like 315whp N/A. On gas on a 2l engine :-?

Cool story bro. You did see the graph and the HP numbers right? Why are you bringing N/A engines into this?
You are comparing your "calculations" to real world HP numbers that a car put down to the wheels on a Dyno Jet setup. :?
 

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BADNEWS

Member
Well my buddy just asked Vituned who tuned the car. They said it maxed the 9180 out at like just over 900whp.

Maybe he changed turbos.
 

Pipedreams

New member
3SDNA":1o7iqrtn said:
Pipedreams":1o7iqrtn said:
That gain would require alot more than raising the boost. 930whp at 36psi would equal ~267whp N/A. Then 40psi would equal ~1004whp. 1140whp is more like 315whp N/A. On gas on a 2l engine :-?

Cool story bro. You did see the graph and the HP numbers right? Why are you bringing N/A engines into this?
You are comparing your "calculations" to real world HP numbers that a car put down to the wheels on a Dyno Jet setup. :?

Because boost works as a multiplier on the power the engine would make at ~14psi (N/A) and it is pretty linear up to a point when it drops off. So a 200whp gain from 4psi is just not possible on that engine, it would need alot of changes to VE if it´s the same displacement, not just more boost.
I´ve seen alot on the internet but I just don´t believe everything is true, bro.
 

BADNEWS

Member
3SDNA":3civwohc said:
Have you ever thought about going with the EFR, maybe the 9180? :D

I know there is a K20 powered Mr2 in town making 1140whp at 40psi with that turbo. The K20 cant be that much better than a 3s can it?

Im not experienced at all with the Honda engines. I did not know the K series was that much more efficient than the 3S. This guy made 930whp at 36PSI, and 1130ish at 40PSI with the 9180 on the K20. I was just wondering where the 200HP difference was coming from. I guess there is no way a turbo would make up that difference, im :crazy:

I didn't even catch that you said the 1126whp was at 40psi. There is no way possible for that to happen. Especially knowing he made 930@36psi. Something had to change with his motor setup.

Pipedreams is correct that boost is a multiplier of power, and it does it on a very linear scale. I know that the MRS made 480@10psi. So with that knowledge you can calculate estimated HP for certain boost levels.

10psi=480
15psi=577
20psi=674 (Actually made about 700)
25psi=771
30psi=868
35psi=965
36psi=985 (Actually made 930)
40psi=1063
45psi=1160

You can see @36psi he made 930 which is down 55hp from where he should of been based off his numbers @10psi. If you use his 700@20psi numbers he should of been at 1020whp@36psi. That is a sign of something is getting maxed out. Usually it's the turbo. But you can see one of two things need to happen for that car to hit 1100+whp on just a EFR9180 turbo.

1- Fix the restriction from the day he made 930whp
2- Run more than 40psi of boost.

But based on what other cars like Evo's and STI's make. That turbo doesn't like to be higher than 900whp. That is usually when the compressor wheel gets to it's limit. The K series just gets there with less boost compared to other motors.
 

3SDNA

New member
This has all been very informative. Thanks for explaining it all to me. I'm curious then what he did to the engine since that last pull. I see what you are saying about that EFR maxing out at about 800. Your turbo must be pretty trick then for your setup to make this much power. These power levels are a bit over my head.
 

BADNEWS

Member
Well 3SDNA now it comes out that the dyno graph you posted wasn't Andrew's car at all. It was a 7285 precision turbo which is a much larger turbo than the EFR9180.

9180=67mm turbo (94lbs of flow)
PT7285=72mm turbo (110+lbs of flow)

So that turbo flows about 20% more

Now a 1126whp makes sense. And it also took 45psi which was also estimated before also.

Now for my motor. Let's say I loose and extra 5% with AWD. So 1126 x .95 = 1069awhp

Now for me to hit that number will take a minimum of 50psi.
35psi=835awhp
40psi=919awhp
45psi=1003awhp
50psi=1087awhp

Even if the bigger turbo would net me more power @35psi I still think 50psi would be required due to the efficiency of the turbo declining with that much boost.

So you can see how much better a K series motor is.
 

3SDNA

New member
Oh okay, my apologies, I guess I'm a knucklehead. Those are some pretty intense numbers! I'd still rather take an 900whp Alltrac over a Honda powered MR2 any day! Thank you for the explanation!
 
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