Hello, I'm getting ready to build the motor in my Si to make some real power for the street. I am looking to have a 400whp street car but something that is able to take a distanced drive for some meets and handle getting ripped on every now and then, but not a daily driver.

I was debating on doing a 9:1 motor or a 10:1?

It will be a 81mm B16 with a Peakboost/35R set-up.
most likely 1000cc injectors and some E85? Maybe pump gas? unsure.

All opinions needed.

 

E85? Go with 10:1. You have the fuel to run the compression. Pump gas though, I would stay with 9:1.

 

Well I don't have E85 at the pump and I am limited on when I can get it.

 

What is at the pump where your at? A buddy of mine was using 10:1 turbo lsvtec but when he daily drove it with 91 octane, he had to pull his timing way back to keep it from blowing up. Made only 330ish horsepower due to retarding the timing so much. But did break 600hp with C16.

 

i was just gonna say your going to have trouble making 400 whp on a b16 on pump gas (91or93) octane...but on e85 you should make that easily

 

The type of fuel isn't the most important part. Yes, it can determine whether or not one can reach "400whp" on your SI, but it doesn't explain with HOW that power is reached. You're saying that you want 400whp, which is fine, but be advised with the B16, many turbochargers of larger size that can do 400whp on pump gas (it is very possible) kill a lot of the "fun" factor in it because the b16 will take over 4600rpms on most possibilities to reach that peak power. In many cases, you'll be fighting to control the car (yes, even with an LSD) than you would enjoying the drive. Ask yourself what the true purpose of the car is. If it is a "street/strip" car as you have stated, then you need to look at the budget that you're willing to spend on the turbocharger, your level of mechanical inclination to put it all together, and if you understand the pros and cons of the types of turbochargers that can be used to make that power in the WAY you want the power. Many here will have you install very large turbochargers that have a limited torqueband in an effort to satisfy your "400whp" criteria. They're not necessarily wrong, they're just concentrating on the number; not HOW the power comes in.

If you haven't already, or if you have the ability drive a honda or two with 400whp (I mean a TURBO HONDA, not just any 400whp car) you'd be surprised on how much power that really is to control on the streets.

There are a lot of possibilities, you just have to determine your other equipment choices to make sure that the turbo is right for you.

Sorry for being philosophical, but sometimes, that what it comes down to. PM me with questions and/or suggestions.

 

Thanks for the input.

I already have the turbo set-up though.

 

Well, then you're at a point where you need to bolt it up, tune it, and try it out. At this point I don't think you want opinions from us, I think you want validation. So give it a shot.. tell US what YOU think..

 

Good advice. If 400 is your goal, why did you go with a 35r? So overkill. Full boost at 5000rpm FTL

 

build it right the first time