cam or intake manifold
 

Wondering if I should do cam and springs first or a msd atomic airforce intake? What would need a tune afterwards -baller on a budget

Both would need a tune. Cam/sprimgs you'll see more gains.

Intake 1st. The stock ls2 intake is not the best. I had an 06 A6 with similar mods, I did the ported fast 92 1st and the car ran great. You would want to upgrade the manifold when doing a cam anyway. Get it out of the way now.
Unless you decide to go FI.

It's a 07 a6. I got longtube headers,high flow cats, exhaust, cai. Would the fast require a tune to function? I plan on getting a tune just don't want get a tune and a month later put in cams and springs and need a retune. I'm looking at then new msd atomic airforce manifold

I did a dyno overlay of all my mods from headers to heads. See below.

It's wise to remove airflow restrictions in the proper order, which is headers, then cam, then intake, then heads. Going out of order doesn't make sense, for example, Trickflow heads are great but on a stock cam they aren't the bottle neck so you won't notice the difference.

See how they stack up on the dyno, and note the last three only matter from 4500 rpm up. There is other good discussion in this thread as well so read on if you care to.

https://www.corvetteforum.com/forums...ast-heads.html

Thanks I will Def check that out

It doesn't matter what order you do your mods. Keep in mind that a cam will have a lot bigger gains on a stock motor than an intake swap would on a stock motor. I can't really see the MSD Atomic giving you much until you have other mods to make it shine. Granted there might be a slight increase but you will need a dyno sheet to tell it. You will feel the powerband extended the first time you hammer down with a cam swap.

Personally, I would go with a stall first. Then cam, then heads, then Atomic

Guys he said LS2 MOTOR...intake stocks is junk! Yes cam will net more power but a fast will still net 20hp on a LS2.

Damn that MSD intake is a nice piece of work. A little too expensive for me though. I gotta stick with the FAST 92/102. Go with the intake before the cam, but if you can afford both, get it done, tune it and be done with it.

Or track down a LS3 intake and buy a cam.

What i would do.
 

Buy a 3,400 stall headers ls3 heads and intake manifold appropriate cam port throttle body slap it all in at ones and tune it.

You can just swap out LS3 heads and intake onto a LS2? Is that the difference between the LS2's 400 hp to the LS3's 430hp?

Yes, LS3 heads and intake will swap over.

Edit-Misread.

Yeah I just changed my heads on my LS3 today to Prc 260cc, I forgot about the intake/head difference. Guess I should sell my old heads.

unless you have other mods like headers & CAI, I would do the Intake 1st. The gains will be marginal, but the swap will take an hour or so. If and when you do a cam swap, the added volume of the intake will yield higher gains. Think of an engine as an air pump, the faster you get air in & out the higher output it will have.

:ack: I don't agree! FACT 90MM WILL suport 1200HP. you have to butcher your fire wall to install the fast, 20hp? you WILL have to tune after you install, your right I've seen 20hp gains too BUT was it the fast or the tune? IMHO if you want to get the BEST HP for the buck SUPERCHARGE IT! 7-8 grand 200 HP. if you just want to get over 400 hp to the ground, cam it and tune, my 2006 MN6 LS2 Z06 exhaust system, roller rocker arms, K&N intake, just tuned 381 HP 378 TQ

DUH? the LS2 is 6.0 L and LS3 6.2 L thats the diff

Thanks for all the responses :thumbs: currently thinking cam spring install with torque converter and maybe gears with tune. Any thoughts ? I'll do intake later in year or next?

You don't have to butcher the firewall to install a FAST 102.

No?

No....you do not have to....the "102" fits...

no the Fast 102 fits and properly ported will pick up 25+ rwhp

With an automatic the converter is the killer mod. Do it first, it might be all you need. Gears aren't that important with an automatic, subfloor did a back to back test and the difference wasn't that great to warrant the expense.

If I was you I'd start with a converter, then when you are used to that go to headers. When you install headers your exhaust will smell so be ready for that. Later when you want another boost put in a cam but cam has some drivability downsides. Intake is much later as it won't be really noticeable unless you drag race a lot.

Also, keep in mind that if you want a supercharger/turbo someday that upgrading the intake will be a waste of money and you'll have to go back to the stock one.

Guys use blowers with a FAST all the time. It's not as critical as it is on N/A applications but it still works.

Plus if you pick up a used FAST you can always sell it for what you paid. They hold their value.

can I see the BEFORE&AFTER dyno sheets from an LS2? just the fast thats all

I already got BBK intake , kook LT headers and high flow cats with corsa cat back exhaust. Think mild cam/spring combo with a intake manifold and a tune would compliment the other upgrades no? It's mostly driven on the street with a few drags here and there on test and tune nights.

Ditto, it fits nicely:thumbs:

Yes it would complement it and you'd have gains across the whole rpm range. I haven't seen independent dynos of the MSD on a mild motor, but on a typical cammed LS2 the FAST would produce 20 HP and have similar torque gains in the mid range compared to the stock manifold.

As mention by others, the TQ converter is a great mod for drag racing. Most of the gains are in the launch though. The cam/intake swap will give nice gains from a roll too.

If you do it in stages, talk to your tuner. Many do not charge the full price for a second tune when you come back to them with a new mod. If you do the cam first and then add the intake later, some will charge only $100 - $200 to tweak the tune. Varies by shop and whether they are doing the install and/or supplying the parts.

A stall can be felt through every part of a pull. Not just the launch. The rpms stay in the sweet spot. You have less rpm drop between shifts. Just ask yourself, do I want to make more power on the dyno or do I want to be quicker. I am with you guys 100% that the Fast is better than an ls2 intake. I just don't believe it will make you significantly faster. I would love to see some track times of mods to go with the dyno sheets that have been requested.

I was going to suggest gears, but I see you're already there.