High comp sr20

So I’m building an sr20de for my n15sss pulsar, I’m going with traum forged high comp pistons, race bearings, nitto head gasket kit and head studs. Comp for the pistons are 13.0.1 and I’m wondering what type of power people have pulled from a high comp sr. And I’m wondering if there’s anything else I could do to it to keep it safe and reliable? It’s just gonna be a daily which I’ll be taking to the hills and track every now and then. I’m hoping to get around 240hp if that’s even possible. Also if you’ve got any tips for building an sr that would be very helpful, thank you

Never heard of this engine making that much power. 13:1 CR for daily requires high octane fuel especially if you want to make 200+ hp. It will definitely have to have ported head, aggressive camshafts for very high RPM range and well calculated and designed intake and exhaust systems. That doesn't sound much like a daily...

CR is kinda high, unless you've a good pump fuel available, might get away with it with a wild enough cam'setup, but that raises othr issues.

At a minimum, I would expect you to need TBs or twin side-suckers with a good cold air induction, head work, cam's, a good exhaust and some careful setting up.

I certainly think it's do-able, but there's going to be a lot of work and development involved.

If taking it "to the hills", don't forget to uprate the brakes as well, as you'll be hitting them MUCH harder on the downhills!

There’s an e85 pump not too far from my house so I’ll be going to e85 now. I’ve been getting quotes on getting the head ported but just didn’t know if I needed too, I will be now. I’m looking at an itb setup for it with 550cc injectors I’m just not sure if that’ll be enough for it. I’ll also be making a cold air intake which will direct air towards it.

I’ve found a set of cams for somewhat of a good price I just don’t know if they’ll work well or not I’ll post the specs below if you could have a look and help me out a lil bit.

I’m going for a full 2.5” exhaust with a 100cell cat, resonator and a cannon which should be enough air flow to get out.

im also gonna be getting good brakes and 8” wide ar1s so braking and grip shouldn’t be a problem

I’ve got a Nistune and I’ll be taking to to dynoaus as I’ve heard good things about them so far

Also just quickly thank you so much for the help

E85 will give you 5-6 percent of additional power but I believe 550cc fuel injectors will be not enough for your goal with that type of fuel as you need almost doubled volume of E85 comparing to pump gas.

The camshafts you selected are very mild and it looks like they are for turbo conversion. For very high reving engine you will need something like 290-300 degrees, not 260.

Geometry of exhaust system must be calculated for your specific goal (primary and secondary tubes diameter and length).

And as already said for 250 hp you will need ETB installed and (most important) properly tuned.

Should I go for 1000cc injectors to be safe?

I’ve found a camshaft set with 294in and 300ex that would be a better option for what I want right

I’m not sure how to do etbs on a pulsar but I’ve head itbs can give quite a bit of power

Yes, something like 1000cc will do the job with E85.

With 86mm stroke you will be able to safety rev up to 8000 RPM on stock internals which isn't enough for making 250 hp with aggressive camshafts. You'll need additional 1.5-2 thousand RPM to get which will get you to piston mean speed well above 25 m per second meaning you need to upgrade pistons and rods with bolts- you'll need lighter and stronger rods and pistons. As well as valves and springs with retainers.

Like I said with your goal it doesn't sound like a daily but like a whole project...

Just out of curiosity I went online to find out how much power those engines make and the most powerful NA engine I found was making 190+ whp with DE head whilst the same engine with VE head was making 210+ whp. It's very significant difference for such a small engine.

Check it out...

https://www.sr20-forum.com/tuning/!10146-the-most-powerful-engines-thread-dyno-thread-for-powerful-cars-and-tuners.html

I’ll have a look at that Ina sec, I’d just like to say thank you so much for the help but I’ll be putting this motor aside for now as I have another motor that needs to be rebuild and will be done a lot quicker and cheaper. I have got some questions about that which I will be making another post about if you could help me with that.

thank you

Very wise decision...