turbo cam vs. nitrous cam: what if I run both power adders?

[AZ3.8Camaro]

ARe you using a supercharger or a turbo?
It sayd either or at verious points in this post.

If you run super/nitrous get a a cam with more exhaust duration, and maybe a bit extra lobe sep.

If you run a turbo/nitrous, get a cam with close to the same intake and exhaust durations, and maybe a bit more lobe sep.

[ February 02, 2005, 02:31 PM: Message edited by: AZ3.8Camaro ]

[WickEdSix9838]

Originally posted by AZ3.8Camaro:
ARe you using a supercharger or a turbo?
It sayd either or at verious points in this post.

If you run turbo/nitrous get a a cam with more exhaust duration, and maybe a bit extra lobe sep.

If you run a super/nitrous, get a cam with close to the same intake and exhaust durations, and maybe a bit more lobe sep.

You've got it backwards in your post. A supercharger and nitrous BOTH require more exhaust duration to get the extra gases out of the motor. A turbo requires less exhaust duration to keep the velocity up in the exhaust track to spool the turbo. Both however would require extra lobe separation.

[T-Punk]

i really think the better option is what james and i mentioned because it would allow you to choose a cam that matches the system perfectly.

[AZ3.8Camaro]

Originally posted by WickEdSix9838:
You've got it backwards in your post. A supercharger and nitrous BOTH require more exhaust duration to get the extra gases out of the motor. A turbo requires less exhaust duration to keep the velocity up in the exhaust track to spool the turbo. Both however would require extra lobe separation.

Damn, I wasn't paying attention, your 100% right, I switched it in the original post.

Anyway, I think the problem with most turbo cams is than people THINK they need a WAY bigger turbo cam than they do. The effects become way exagerated.

EXAMPLE: This guy runs 8s with an all turbo car. He runs only ONE degree less exhaust duration, and slightly lower exhaust lift on his cam.

I see guys on here all the time with goals of 11s, maybe even 10s who are trying to run 10+ degrees more exhaust duration. Not good. Just add some LS on an almost symmetric cam.

[ February 02, 2005, 02:37 PM: Message edited by: AZ3.8Camaro ]

[malice10985]

Originally posted by 12secondv6:
Ok.... why not just get a turbo cam... up the boost.... and use the nitrous as an Nter chiller style set up and spray the intercooler?

Focus on one power adder...... and use the nitrous to compliment it.....

Keep in mind... for me to say... don't use nitrous.... as a dedicated power adder.... ESPES over a silly turbo.....that should mean something [img]tongue.gif[/img]

Please... keep us updated!

My n20 will primarily be acting as a cooling agent to the boosted air.... at first. I will start out with a 30 shot or so. (what size would that be?) I am going to get an intense turbo cam. The nitrous will work with the shorter exhaust duration without a problem.

I don't want to spray nitrous on the outside of the intercooler. That seems so wasteful. If I were to do that, I would use Co2 or some other cheap gas, not the superbadasspimpdaddy spray.

[00firebird]

Originally posted by WickEdSix9838:
Run a straight pattern cam. That way you have less exhaust duration to keep the velocity up for the turbo but you still have more duration than a turbo cam for the nitrous.

listen to this man.
lol.

[Arctc Wolf]

Something else I'd like to point out, turbo and nitrous application, to me, should require a hard look at the exhaust side of things. The idea is to keep velocity up to spool the turbo, backpressure down to reduce reversion, and high flow to get the burned boost/NO2 charge out of there. Some suggestions to you:

definitely a cut-out right after the turbo. less backpressure will spool it up quicker, evacuate the cylinder of the charge quicker, and reduce reversion.

huge piping after the turbo. unlike NA, turbo's enjoy the least backpressure possible, so there is no such thing as overkill exhaust pipe size in a turbo app, especially since ur gonna run nitrous as well. 3.5" or bigger sounds optimal.

header size and design. I'd suggest short, equal-length, custom headers. shorter means quicker path to the turbo, and ultimately, out of the exhaust system. equal length helps separate the exhaust pulses a bit, providing more flow and squeaking a little more power and spool-up from the turbo. I'd say 1 3/4", or even 1 7/8" primaries would be good, giving good flow as well as high velocity, as long as ur on the juice. the 1 7/8" would be overkill w/o the juice, and prolly reduce velocity at lower rpm's on the street.

[WickEdSix9838]

Originally posted by Arctc Wolf:

header size and design. I'd suggest short, equal-length, custom headers. shorter means quicker path to the turbo, and ultimately, out of the exhaust system. equal length helps separate the exhaust pulses a bit, providing more flow and squeaking a little more power and spool-up from the turbo. I'd say 1 3/4", or even 1 7/8" primaries would be good, giving good flow as well as high velocity, as long as ur on the juice. the 1 7/8" would be overkill w/o the juice, and prolly reduce velocity at lower rpm's on the street.

1 3/4" primaries are way to much, much less 1 7/8" primaries. 1 5/8" is as big as he needs to go. The primaries need to be more on the short side and definately equal length, no more than 4" difference between each tube for the best performance.

[malice10985]

My headers are just like Shanes old forward swept headers, except they are 1 7/8". They aren't really fancy, just enough to start with.

I won't be replacing my cam for a while now. I was about to get a set of used intense stage III CNC heads, but I found out at the last minute that L67 heads have fuel injector bosses in the heads instead of the intake manifold. [img]graemlins/slap.gif[/img]

There is no point in getting a huge cam now if I will still have stock heads. [img]graemlins/slap.gif[/img]

Needless to say, the guy that was going to sell them to me is furious because I called off the sale. I hope he refunds me my $1500. I wanted those heads sooo bad.

WIckedsix- Have you found any 98+ cores yet? I need a set of nice P&P heads without ****ing injector bosses in them!!!!!!!!! :mad: :mad: :mad:

[RedFrk13]

Stock heads and cam can take you into 11s with a good turbo. A couple fwd 3800 cars have done it. [img]smile.gif[/img]

I will be working on a turbo system soon and have a used intense stage 2 turbo cam, but I dont plan on using it for a while, if at all. I want to see what the stock engine can do. Plus it will be easier to tune with the stock cam.

If you are planning on getting heads, the abbots do look like a great choice.

[WickEdSix9838]

Originally posted by malice10985:

WIckedsix- Have you found any 98+ cores yet? I need a set of nice P&P heads without ****ing injector bosses in them!!!!!!!!! :mad: :mad: :mad:

Yea, we should have them in a week or two.