B18C1 Turbo help

[AlexD]

It makes more power than going lower compression and its better for driving when out of boost.

 

[AlphaWolf1993]

It makes more power than going lower compression and its better for driving when out of boost.

Would 10:1 boosted be usable up to/over 550hp, with sleeved block and complete build? Or would it be smarter to at least drop it to 9.5:1? I understand the drivability vs. max power and the low end vs high end concept and how less compression can allow more boost, but high compression like 10:1 and high boost 20+ psi would need race gas would it not? If it sounds dickish, I don't mean it to be, I am sincerely asking because your knowledge > mine on this.

 

[AlexD]

9.5:1 will allow room for more tuning error than 10:1

If you have a good tuner, there isnt a reason why 10:1 should be an issue.

Eventually, when you raise the boost, you will need race gas to avoid detonation.

 

[AlphaWolf1993]

But lower compression would allow for more boost before race gas is needed correct?

 

[AlexD]

Technically yes, but look at it this way.

You will make more power with less boost with high compression
you will make the same power with less compression and more boost

Its a give or take thing.

What Ive learned is, build the car to how it will suit you best, and by that I mean, if your car is seeing 90% of city driving, dont put a large laggy turbo on it or 8:1 compression pistons. you are only making it worse off for yourself in terms of driveability.

10:1,10.5:1 I dont see there being an issue with, I mean people out there are boosting stock S2000's and those have 11.5:1 CR ratios. The owner of full blown motorsports in apple valley MN made 800+whp stock engine s2k last year. MONSTER

 

[Prozon]

S2K motors are a little more stout from the factory then ours are lol.

 

[AlexD]

But we are speaking in terms of compression not strength. If an 11.5:1 compression s2000 can be turbocharged without issues then 10.5:1 or 10:1 isnt a problem. And if your tuner cant do that, then find a better one

 

[Prozon]

Oh I know, I was just saying I can't see an Integra having 800whp stock lol.

 

[AlphaWolf1993]

So, say the block is sleeved. Approx. 10:1 CR and decent boost can make 600hp? Or would it strain the motor too much in tuning on pump gas? That's kinda what I was shooting at earlier.

 

[Prozon]

I've seen builds hit 500whp on pump gas. I'm not sure if it was 10:1 or 9.5:1 though.

 

[AlphaWolf1993]

Yeah, I've seen GSR motors hit up to 600 and I think a little over on pump gas, but they all ran 9:1 and just boosted like 25+ psi. I only ask because I'm looking into making at least 550whp boosted and I want to pick a good enough CR so it doesn't lag on the street...

 

[Prozon]

I think you could manage 10:1. I'm aiming for 500whp on 10:1/pump gas on my next build. I really feel like I should just hit 600 so I would actually be satisfied with it. I think with 500hp i'll still be aching for more, I just set up the build sheet around 500 so I could avoid swapping out some things, but $20,000 into a build, i'm not sure it will matter much.