Thread: Went to the dyno today

geez i was just gonna say now dude. I stay in kbly and we at 3300FT ASL.


Great numbers think you should post a vid up i wana hear them itb's

I'm running 11:1 with 20V pistons.

The N1 is a lot better below 6,000rpm. From 7,000-9,000, the FS4 felt better. The N1 runs out steam after 7,500. Each has it strong points so I wound up mixing them up.

On a side note, the sound from the FS4 is crazy as you know. Some people think the N1's are loud but they have not heard the FS4. Not even close.

Your intake runners are close to the factory length, which is 8.5". The factory length are meant for 7,000-7,500 rpm. You need to shorten the air horns. You should be aiming for 7" for the runners, that will put you at around 8,000 rpm for peak power.

Too much reading internet misinformation and not enough first hand experience.

who me or someone else? And which point?

Can you or someone further explain that and what it does please. Im a little lost i don't know if im reading wrong or if i don't know what that means. Thanks in advance.

It plumbs your pressure/blow-bye oil out of the intake and into the exhaust stream. Keeps oil out of the intake, and relieves crank case pressurizing.

Yes 5 speed is correct fs4 makes good power but the problem is its out of the range for the average folk, 8500-9800 rpm type of camshaft .Also about itb's are too long as stated .I wish you can do one mod at a time to see what actually hurting your #'s.



Google it buddy! most likely it wont help the average motor setup unless you have a serious setup.

yeah i would probably shorten them about an inch

Yeah man those FS4's certainly POP! Especially with the ITB's it sounds like a fighter jet when they kick in. And then the rev counter spins like it's gone crazy. If I'm not carefull I run into the 8500 limiter every gear.

On a side note, let's assume with dialing the cams a bit there are a few hp more to be had. Would it really be such a terrible thing if these cams peaked around 7500-8000rpm? Personally I think not. I know it sounds nice to tell your friends you make power to 9500rpm but if you can make that power without revving the tits off your motor then the motor will be saved for longer. It's different if they made great numbers from 7500rpm and held it all the way thorugh to 9 or 9.5k. That I could see the benefit in.

If you want peak power to be around 7500-8000, then I say go with the N1. That's where they were designed to run. The FS4 above 8,000.

There's no such thing as a "perfect cam". Each camshafts was designed for the desired rpm range. Here's an illustration, lets look at the stock camshaft. The low cam, with it's short lift and duration, was meant to run below 5,000 rpm. It's not going to make more horsepower than the high cam above 6,000 and vice versa, the high cam won't make more hp than the low cam below 5,000. Each was designed for the desired rpm range. That's why we play around with the activation points.

Now back to the N1 and the FS4. The FS4 is a lot bigger in duration than the N1, so it naturally wants to run higher up in the rpm range. If the engine package(header, intake manifold, compression ratio) doesn't match up with the cam, the engine will underperform.