cbr600rx7

iTrader: (12)

Just like the topic said where do i go from here with building power. I have the traction and a RPM built stage 5 waiting on the stocker to bust so where should i be looking to pull more out of the old girl. The engine has around 95K on here now and other then the mods listed below is bone stock. I had planed on swamping out the LS1 manifold and TB to a FAST 90mm but now i am not so sure.


TTI 60 trim, 60lb injectors, snow meth kit, patriot springs, mild LSA 115.

67Firebird455

iTrader: (27)

You tell us, do you want to go 402+? You should be able to get decent boost with that setup on a larger-displacement motor that is forged. With those injectors, depending on what's feeding them, you'll be tapped at 600whp with 100% duty cycle. What kind of fuel setup do you have?

Shoaf85

iTrader: (9)

With enough pump and a boost referenced regulator you can easily make over 700 rwhp w/ 60 lb injectors!

67Firebird455

iTrader: (27)

You're right, if he can keep the fuel pressure up there.

67Firebird455

iTrader: (27)

Isn't it something like:
(Horsepower) * (Brake Specific Fuel Consumption)
(# of Injectors) * .80 (Duty Cycle)

I thought turbo cars BSFC were somewhere around .65, may be wrong...

67Firebird455

iTrader: (27)

And then:
Injector Size (lbs/hr) x 80% duty
.65 BSFC

67Firebird455

iTrader: (27)

So with 60lb injectors, he'll be right at 600bhp, now that's not to say he can't get more than that, that's not what I'm saying, but depending on AFR, etc will determine when he's out of fuel.

cbr600rx7

iTrader: (12)

Right now i am trying to get as much as i can out of the little 60 trim and keep her close to stock cubes. Some day in the future i will go throw and rebuild and beef her up a bit but right now my goal is to break the 500 mark on pump gas while still keeping her on the mild side.

67Firebird455

iTrader: (27)

You should be able to easily do that then bud. Get a set of #317's with larger chambers to drop the comp down a bit, and run a hair more boost, I'd imagine you'd be able to break 500, maybe get close to 550 with that setup and still be reliable!

67Firebird455

iTrader: (27)

BTW - Are you intercooled or no? I see meth, but are you running an IC also?

cbr600rx7

iTrader: (12)

Right now i am sitting some where in the 450-470 range so i am getting close but not there just yet.

cbr600rx7

iTrader: (12)

Yes i am running a TTI FMIC and to support the injectors a 255 fuel pump.

67Firebird455

iTrader: (27)

Well, install a set of stage 2 #317's, add a couple psi, and call it a day. Let it breathe! =)

67Firebird455

iTrader: (27)

Not sure what you've got as far as a cam, but I know with turbo applications, a cam can go a LOOONNNGGG ways! Something with a bit more duration, with very little overlap will get you there. Just look for something in the upper 220's, low 230's on a 114-116LSA. Will still spool like a madman, and will make a grip more power.

cbr600rx7

iTrader: (12)

228/234 115LSA from texas speed and RPM.

67Firebird455

iTrader: (27)

#'s are just a hair low then if you're running 8psi.

cbr600rx7

iTrader: (12)

10 on the street and 12 on meth every where else.

67Firebird455

iTrader: (27)

And you're only pushing 450-470rwhp?! You should be able to do that on somewhere around 7-8psi with your setup.

cbr600rx7

iTrader: (12)

The TTI 60 trim only put down around 420hp 510torque on 10psi with only the 60lb injectors. Its a great kit if you hate lag but as you know its a very small turbo for the size of a LS1. I dont think i will pick up 80 horses from 2 more pounds of boost with the meth and the mildish cam and springs.

67Firebird455

iTrader: (27)

Maybe not, look at swapping turbos to make up for it. Working it's poor little *** off, and not very efficient then. A 76GTS will solve that.