Here's my goal
 

Hey guys,

I'd like to get your input on how to reach my goal of 400RWHP.

Dynoed 315.4RWHP with:
FIPS, Catback, 2.73s

Current and upcoming mods:
ARH LTs, LS6 intake, Cutout, Lid (FIPS is gone), 3.93s

I'll loose a bit of HP due to the 2.73->3.93 swap, but the rest of the mods should more than make up for it. However, I'd be surprised if it puts me at (or even near) my goal of 400.

Question is.. Would a cam be enough to hit 400, or do you guys think I'll need to do a head-swap as well?
Or, is there another way that I've overlooked?

As for spray, that'll come later (not trusting my 10bolt)

With the mods you have and the mods you are going to do Im going to say it will get you around 350-360rwhp. You are an M6 right?

Cam only should be able to hit 400rwhp without any trouble. A TSP 228R or really any cam with a high 220 or low 230 duration should get you right in that range.Throw an underdrive pulley on there too.

If you want to be sure you get over 400rwhp you could either port your heads or buy an $1100 set or PRC 5.3 or even the LS6 stage 1s.With that you should be in the 420rwhp range, all you will need is a good tune.

Actually, it's an A4 (for now).

And a good tune is being taken care of by CMS. They're hopefully installing the LTs next week.

How loopy is a 228 duration cam? I've heard the 224s, and they're not too bad. I need the car to pass for stock when I eventually bring it back to Sweden.
UD pulley you say? I thought that was mainly a m*stang thing.. :)

25% ud pulley will do i got one on my ss runs you about 160 bucks after shipping as long as you get one with not to big of a lift on a high lobe seperation it shouldn't lope too much that ls6 intake with a cam will get you some pretty good pull on the top end... i'm happy with my 221/224 cam on a 112 lsa not to big but enough power for what i wanted i'm sitting on 370 and will get some stage 2 ls6 heads next year will be hitting 400 at least by then

Well as long as its an A4 your rwhp numbers will be low so if its numbers you are after an M6 swap is needed, but those mods on a stalled A4 with gears will be quick.

Its not so much the duration of the cam, its the LSA you want to look at to not be loopy. A 228R on a 114 LSA would be enough that a few people could tell it has a cam, a 116 LSA would be stealthy where as a 112 would be more of a rough idle.

UD pulleys are nice and not just a stang thing for sure. I picked mine up with belts for $190 I think, and I really cont tell a difference in the driving as far as power steering goes. It s said to be good for 10 rwhp or so.

Well your tune will be great from CMS...talk to Ryne about your goals and see what he suggests and what he can do for you, Ryne knows his shit.

its going to be pretty hard to get tp the 400 with just a cam and those bolt ons on ur a4 ur probably going to need some better heads to get there, u could also do the 90/90 and some pulleys

i made 436rwhp @ 6200 rpm, cam only no underdrive pulley and full accessories...this is with a restrictive 78mm air lid and MAF, nitrous plugs and lower compression than stock...its not hard to do, just as long as the cam has the right valve events...

stock heads are good enough to make decent power without modification...

believe it or not the percentage loss between an m6 and a 4l60e is marginal at best...

I thought you ran a 90mm setup with your Victor junior intake with an 85mm maf? How could you even run a lid with a vic jr?
I don't remember ever seeing any pics of a vic jr with a lid, do you have any?

My blue car laid down 432rwhp cam only through the 10 bolt, and then 423rwhp through a 9in, and that was with no aftermarket intakes manifold, or throttle body

it can be done!

your right i made a mistake...i did have an 85mm MAF meter on it...and yes i do still run a 78mm mti air lid on it...in stock form the lid wont fit...it must be modified to work...i think i got a pic somewhere...

oh yeah i forgot my numbers were made through a 12 bolt with 4.10s...not that it really matters...you barely lose any power going from a 10 bolt to an aftermarket rear end...

curious, what rpm did you make your peak power at with the blue car?


heres the only pic i have of the setup...you cant really see the air lid, but i am ditching the maf and going SD...then doing a ram air deal instead of the lid... the 78mm restriction in the farthest reaching point of the induction system is killing me on the top end...w/ an underdrive pulley and the right sized intake piping that thing would have made over 450 rwhp cam only...

My blue car peaked at 6250 as well. I tried running bigger piping on mine, but it didnt pick up anything. Not sure if the piping was a whole lot of restriction, but either way, thats some solid cam only power! I wonder what mine wouldve made with a FAST or a Victor setup.

what happened to your car? "would have made" 450+? You got a new setup on the way? when's it gonna be done man?

im sure you would have picked up a lot with a better intake manifold...one of these days when i have a chance i want to port the vic jr. just for kicks to see if it picks up anything...but im probably gonna ditch the sheetmetal elbow setup in favor of a accufab 4 barrel TB

where in the exaust path did you enlarge the piping? a common misconception is 3 inch piping from the header collector back is necessary...we did a stock bottom end h/c ls1 a few months back that made 475@6400 rpm 410 tq...this was through pacesetters and 2.5 inch true duals over the axle...m6 car with a 12 bolt as well
if your talking about enlarging the header primaries, that will move your peak powerband higher....but if you dont have the intake flow to support it, it will work against you...

i blew my t56, and i found a fresh built braked t400 with jw bell for less than what it was gonna cost me to rebuild the t56 the way i want...im still waiting for my converter which is taking FOREVER! and i got a couple clearance issues with the motor and bell housing...but thats no biggie...mostly its just me not having time to work on it...

i still think the engine had more power left in it, we didnt finish the tune since it locked up the tranny on the dyno and the car has sat since...shit man its probably been 7 or 8 months since the car went down...since then ive gone back to tr55s, since i wanna dial the car in on the motor before the unit goes on and put on an underdrive pulley...so with a t56 in it im sure it would break 450 no problem...now with the t400 it might make 400 rwhp lol but that fckers gonna move..

No, not the exhaust, I was talking about the intake tubing stuff.

I see now, well let me know when it's done, we gotta run em!