Adam Cifonelli

SO been saving over the winter. Starting now to plan what to spend the money one. Right now I have it planned to do Hinson Headers with catted x pipe(800$)..Vararam Intake(375$). I had stock exhaust, purchased some NPP mufflers for $300. Got a Diablo tuner(300$). Not sure how much a custom tune threw DiabloLew would be. But will get a custom tune.

How much HP do you think it reasonable to expect?

Dano523

6hp with the NPP gates open.

About 25HP from the long tube headers,

About 15hp more from the re-tune.

The Vararam intake is not going to gain you any more power, but will prevent loss of power from the engine pulling in hot air that can cause the engine to start to retard the spark advance timing from the hotter air instead.

Adam Cifonelli

Well the intake helping to full timing from the tune should add some HP. The Vararam website says:

"So now the how much power will you get question- standing on a dyno without using any special programming you should expect 10-15hp from any cold air kit,but once moving the VR will put all the lost MAP pressure back into the plenum yielding another 17hp by 60mph 19-20by 90-100mph"

So in a 1/4 mile should add 20ish HP? Adding that, thats around 490HP at the crank.

Turbo6TA

The A6 cars will lose about 15% HP at the rear wheels ... The M6 cars will lose13%

My stock LS3 / A6 made 371 RWHP (SAE corrected) ... with 15% loss, thats 435 Net HP

Adding Pfadt long tube headers with cats and a dyno tune, it made 405 RWHP (SAE corrected) ... with 15% loss, thats 477 Net HP

So, I got a 34 RWHP increase.

Note: This was using the same DynoJet.
___________________________

I don't have the 'before' dyno sheet, but this is the 'after' dyno sheet:


Attachment 48338516

Turbo6TA

If you look at the RWHP curve on my dyno chart above, you will see that the HP stopped increasing at exactly 5,500 RPM.

I can't explain that ... I would think that it would still increase slightly on up to about 6,000 RPM.

It just hit a 'wall' at 5,500 revs.

? ? ? ?

.

irok

30rwhp

Boomer111

My MN6 2008 whnet from 375 rwhp 381 rwtq to 422 rwhp/rwtq with catted ARH headers and Vararam and a tune.

47 rwhp gain.

Remember all dynos are different.

I saw 400 rwhp/rwtq with just a tune with 800 miles on the car.

cadyshac

Not to single out Vararam here but all these companies are in business to do what? Bingo, sell you a CAI! It's your money do what you will. Many on here will tell you your stock intake is more than sufficient and their claim of 17HP is pretty lofty IMHO.

HOXXOH

The only way you can determine how well a CAI performs vs stock, is with a timeslip from the dragstrip and adjust for DA.

Convincingly, Vararam is the CAI used on the quickest cars on the performance list more than all the other brands combined.

Not So Fast

I believe my car is almost identical to Turbo6TA on mods, headers, intake shroud, new plugs & wires, Npp and you see his dyno results at 405 rwhp on a DynoJet. Mine was done on a Dyno Dynamics machine, rwhp was 363.1, so don't get hung up on numbers as I did, because I would wager that our 2 cars in a drag race would be within a fender of one another on any given day
You should get a before and after baseline to really know what you improved with the mods.
NSF

Adam Cifonelli

Seems the average is around 40 rwhp. Thats not bad for around 1800 in parts.

J3TVETTE

I say 400-410whp is what you will see.

Adam Cifonelli

I think thats enough work done to dip into the 11s. Im shooting for 11.7s Got to stay ahead of them new Mustangs.

Dcasole

Adam, I have the exact mods and tune and I agree it should go 11.7 but now the problem is launch .... our track leaves a lot to be desired at the starting line and the best I have done on street tires is 12.0X with a 1.9 - 2.0 60 ft times , which is not to shabby but ...

Factor in a 3200 converter and drag radials if you are really looking for a 11.7 ...
Dave

Adam Cifonelli

I did ditch the runflats. I have brand new Conti Extreme Contact sports. They are much grippier. When warm on normal street I could WOT and just barley squeek the tires. Very grippy.

Dano523

Peak HP at 5.5K is because the AF and timing was not played with. Hence GM has the stock tune to peak short of the red line, so you shift early instead.

Get these two correctly tweaked and the motor should be pulling hard to bounce off the rev limiter.

All stock LS-2 motor with such above tweaked, so the motor bounces off the rev limiter with vengeance still pulling hard.
Attachment 48339858

Back to a Cold air intake, and it does not add more power, only preserves the motor from taking it much hotter air engine bay air than the outside temp air, to prevent timing retard isntead.

So when the air cleaner is pulling in hot air from the engine bay, depending on the engine bay temp its pulling in, it can cause the timing to be retarded to reduce the HP levels.
Attachment 48334173

So again, with the parts listed and the tune, here will be his gains,

6hp with the NPP gates open.

About 25HP from the long tube headers over the stock exhaust manifolds.

About 15hp more from the re-tune.

As for C6 base stock motor crank HP,
LS2 makes 411 at the crank,
LS3 makes 436hp at the crank.
I bring this up, since if you dyno the car stock, should be coming up with the correct HP numbers to start with at the wheels, and not someone short pull Dyno'g to make the adds on look like they are making more HP than they really are from the stock motors numbers isntead. Hence if you have a LS2 M6, and is dyno'd stock, the dyno should be showing that the RWHP should be 350hp at redline ASE corrected.

As for Crack HP to wheel HP numbers,
if a M6, then about 61 HP loss from crank to wheels through the drive line.
If a A6, then about 80HP loss through the drive line to the wheels instead. The added loss in about 19HP is due to the torque converter in the automatic transmission.

We know the amount of loss through both drive line systems compared to what the stock motors put out/to what is will dyno at the wheels, and these are fixed numbers losses through both C6 drive lines/trans.

If you add HP to the crank, then the loss through the drive line does not increase, but remains a constant instead (unless you do mods the drive line or gearing, which changes the know constant lose numbers of both the M and A drive lines.

So LS3 / A6 making 371 RWHP (SAE corrected), has the power at the crank about about 451HP (371hp +80hp drive line loss for the A6 drive line).

Adam Cifonelli

All these numbers and such aside.. Vararam does claim to cut .2nths off a 1/4 mile run. For 375$ thats pretty damn good.

http://www.vararam.com/sc1.html

Dano523

Agreed, since they are pulling air from outside the car, instead of from inside the hot engine bay, so from the launch and down the strip, you are only saddled with the outside air temp timing retard (if any) alone.

On intake system that are pulling the air from inside the hot engine bay, your dealing with the timing retard from the launch, until the Maf sensor (has a air temp sensor in it as well) registers cool air being drawn through it maybe half track or more, and then the ECM stops retarding the timing from that point forward.
Note, if you are hot lapping, then may not be enough for the MAF/ECM to see cooler by the end the run , with timing retard the entire run instead.

Dcasole

11.7 on stock tires is optimistic at best ....especially after adding headers , CAI and a tune which is going to reduce or turn off torque management

Dave

Adam Cifonelli

So with ruffly the same mods but with DRs 11.4 is pretty damn impressive.