I was just wondering if one runs say stage 3 or 4 cams, gets the heads ported and does long tubes if it is still safe to run 100 shot of n2o? I know that with the proper tune, blah blah blah...

and if one goes this route what e.t. can be expected without weight reduction, etc. And rwhp?

I appreciate your time, I am looking at alternatives to power adders, mainly Turbos.

- Jesse

 

You nailed it, the tune would be everything. I'd say with a 100 shot you're pushing it. Our bottom ends are weak at about 450rwhp +. With LT's cams and ported heads you should be up above 350rwhp (that's a complete estimate), so add a 100 shot from N/X, and you'd be around 450 at the wheels. If you have a great tuner, he could probably work out the lean spike, but he'd have to be a really good tuner. My buddy blew up his bottom end due to not being able to work it out. Made a few dyno passes and disaster ensued. Pictures upon demand. I can get you a stand alone fuel system and then you wouldn't have to worry about a lean spike and help from blowing up your bottom end. On top of that this system would support all the nitrous you could throw at it. I would really look into N/X plate kit for the 3v's. I was there last week and their plate kit looks amazing. I'd say if you do all that and get a dead on tune you SHOULD be alright.

 

Thanks man, and yeah SHOULD... ha ha. Do you have a link to the plate system> I know when the one came out for the 2 valves in 2002 I really liked it.

 

http://www.nitrousexpress.com/Pages/3v_platesystem.htm

 

Has anyone done tests on the 3V camshafts?

Several people on Modular depot did tests on the 2V cams (I believe MMFF also did tests) and the best cams to get were the Stage 1 cams since they boosted hp/torque at the RPM regions where you'd normally operate in while drag racing. Stage 2 cams were pushing it and you lost even more low end torque. As you progressed to Stage 4 cams, you lost a LOT of low end torque and the boost in hp/tq came at the very high end region (6000+ RPM) making it quite useless for a daily driver and less than useful for an engine with stock internals.

 

Checkout www.brenspeed.com for a review of the Comp Cams stage 3 cams.

 

Here's the direct link: http://www.brenspeed.com/tech/compcams.html

It looks like you lose quite a bit of torque until 5000 RPM, when it crosses over (Stage 3 produces more torque from this point on). I see the same trend with horsepower. The stock cams produce more hp and torque up until ~5000 RPM. Assuming the 4.6 3V uses the same stock crank as the 4.6 2V, it is balanced to 6200 RPM and anything faster is playing with fire.

I would like to see Stage 1 and 2 cam data before considering the Stage 3 cams for my car. If the trends are the same as the Comp Cams 2V cams, then the Stage 1 cams would lose less low end torque/hp than the Stage 3, while providing noticeable gains above 3000-4000 RPM, allowing 2000 RPM of playtime with more hp/torque versus 1200 RPM.

 

I too would like some more info on the Comp cams stage 2 for the 3V. I am still gathering info on our cars and cam selections. It seems like most are going w/ stage 3 and then plan on adding a blower in the future, but I plan on staying N/A and perhaps adding an AL driveshaft/flywheel combo. I already have all of the normal bolt-ons so these are the next in-line to add performance (as well as brake upgrades and more suspension). Has ANYONE (or know of anyone) that has the stage 2 Comp cams? The Comp website states the stage 2 are a good selection for street set-up w/ excellent mid-range torque.