MRC still at it...I guess the PnP intake can add some value...

B6/7 S4/RS4
#1

This post talks about PnP intake and timing number…

This RS4 B7, with Milltek catback, did 372ps 420nm which is about average for an untouched RS4. Flowing 144 gs on the MAF, this was slightly lower than average

We did a full Carbon Clean, Stage2 inlet manifold with locked runners and deflapped (original runners had play and not fully opening), a cold air feed with high flow air filter, gutted the precats and a stage 2 MRC Remap.

Now this does 442ps and 484nm, with quiet start, linear throttle response, sec air disabled and full throttle in all gears.

How does a normally aspirated car make such big gains? Flowing 178gs, a 20% gain in airflow alone. Running 31 degrees timing stock with 5-6 degrees retard, this went upto 37 degrees timing with no retard. The graph shows the gains in timing advance and airflow.

#2

here is da link:

https://www.facebook.com/media/set/?set=a.719171671458423.1073742300.154822821226647&type=1

sheeit this look like my PnP intake sitting in da garage.

#3

For the lazy

372ps 420nm = 366.90hp 309.78lb/ft
442ps 484nm = 435.94hp 356.98lb/ft

#4

MRC is still at what?

Also, interesting that a respected tuner is showing the stock tune making 31 degrees of timing, when we have these AMD monkeys saying JHM is aggressive for running 30 lol.

Anyway, that says almost nothing about the PNP ‘gains’.

Before 372
After 442
Delta 70 hp

Now…was there any part of that attributed to other changes? Loads.

  1. guttted precats - MRC have said the precats are worth 20hp
  2. Carbon clean - on their dyno is traditionally 20 hp
  3. MRC tune - who knows because it’s always buried in. 5? 10 hp?
  4. cold air feed is basically worthless on these cars. Not sure what they’re doing there.
  5. the car had other problems…the intake manifold flaps weren’t working. Vac leak? Vac can be 30-50 on these cars on that MRC dyno.

So all in all, the PnP continues to be a debatable modification. I really can’t see the point. JHM did a manifold modification on the B67 S4 and made 10-15 whp for $1000 and it was a good seller. On the b7 Rs4, they didn’t bother because the manifold is very well designed.

Bottom line? I would skip it. Swesna, sell that polished manifold.

#5

But keep the car for about 6 more months…

#6

50 told me da PnP was a good mod.

I got the PnP manifold and since I have it sitting in da garage next to my new front rotors and 4 esco jack stands I say it is time to put it on da car and see what happens.

I also have additional plugs for the (da) manifold bc I have the flaps in at this point. But can remove which means removing the plugs and putting new ones in.

Just like I took my engine/trans out of my 964 porsche. I will install this manifold bc it will be fun doing it. At least if I can do that I will be a little confident if I go with the AMD SC I can install that as well. I still might go with JHM not sure which I will go for. Probably will not be doing either for a year bc I am spending way too much money on my new house in Raleigh.

#7

gibberish.

the port and polish ‘gains’ are supernumerary. Sell the manifold to someone who is uneducated on the subject (now that you are up to speed…)

#8

…and don’t put an AMD supercharger on that damn car.

#9

How about a PnP with a supercharger? Wouldn’t the gains possibly be more substantial given the additional air being ingested and smoothed (and a tune to compensate for this)?

#10

One great way to test this is on a supercharged car. In theory you should be able to install the ported intake and see a drop In boost. The boost should drop due to a less restricted intake. That is if the port work made that big of a difference

#11

I think it’s grossly overstated

People who come from the japanese scene often expect simple mods they’re used to there to apply to these S and RS Audis however we often find they’re disappointed.

On a $28,000 Subaru, cost effective design and engineering is a pretty big key. They leave lots on the table for obvious reasons.

On an RS Audi, that sold for $75,000 when new like the RS4, Audi has turned over many of these stones already in a search for power and efficiency. This is why a few adjustments to the B67 S4 manifold yielded a quick 10-15 whp and on an RS4 the manifold work yielded close to 0 gains.

#12

still probably going to put it on anyway.

then i will let you know what my butt dyno says ;D

#13

Swesna make sure you do before and after 1/4 mile runs/pbox or something tangible like that.

#14

It’s maybe 2-3 hp in a perfect world. Won’t show up on a 1/4 mile or anything. Which is why he should sell it for a stocker+cash.

#15

swesna who did PnP on that IM?

#16

He already has it so why not lol
Let him do before logs/dyno/quarter mile/etc… and after PnP IM install same exact thing

#17

trying to save him some money. People pay a pretty penny for P&P RS4 manifolds. For some fucking reason lol.

He could always do the work/install and then test it but I haven’t seen a frigging thing from Swesna, testing wise, other than a fabricated story about a 1/4 mile timeslip that never existed…so I’m not holding my breath.

#18

my fabricated story was for entertainment purposes. i can tell you one thing the car is running very well in raleigh, nc the last few days. the conditions must be just right as it is pulling hard. one day i do need to buy a vagcom to actually take some type of measurements but just too lazy. i think i personally would suck at the 1/4 mile but maybe one day.

i have to arrange some things in the garage and then i might be putting on the new rotors. my front brakes are making some strange noises when driving slow.

Anyone have advice on front brake pads?