S4 vs RS4 ???
06-03-2012, 01:40 PM
#1
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S4 vs RS4 ???
Anyone who know the s4 b7 and the rs4 b7 can tell me the overall difference bettween this cars... I mean the feeling, the perf and all this.
I love my b7 s4 but in this days i cant stop dreaming of an rs4!! For sure an r8 would be the best but even if its a summer car, the r8 and kids dont fit togheter
I love my b7 s4 but in this days i cant stop dreaming of an rs4!! For sure an r8 would be the best but even if its a summer car, the r8 and kids dont fit togheter
06-03-2012, 03:55 PM
#2
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Re: S4 vs RS4 ???
Salut Francois de Montreal!
I did a quick search and found this which might help as we wait for someone to chime in on this interesting subject
http://www.ehow.com/about_6224517_audi-s4-vs_-rs4.html
http://forums.audiworld.com/showthread.php?t=2746206
You see both have a 4.2l engine, however:
"The S4 hits max torque and HP sooner. I've had pulls with a modded RS4 and a stock RS4. modded RS4 pulls slightly, stock RS4 pulls, barely. The pulling depends on the gear you are in vs the gear they are in.
To make the motor similar would be very, very expensive considering the RS4 motor is a total handbuilt quattro gmbh build. The throttle body, intake manifold, exhaust manifold, cylinders, bottom end, cams, etc. Not to mention the FSI components. That and the differentials in the RS4 have hypoid gear which an S4 does not. This allows 100% of available power to go to one specific wheel on the end that has the most grip.
I've gone the route of lighter wheels, filter, exhaust, ECU, suspension, brakes, differential, etc....and to tell you the truth, the difference is the driver. Hands down.
You can upgrade to the PES G4 supercharger for 8500, plus a few grand more for installation i am sure. It puts out 515hp and 465 Tq. Add stasis suspension and some alcons brakes, and you will walk all over any RS4 stock.
Once the RS4 hits 5500rpm it walks away from the S4 pretty easily. THere are a few videos out there. I try and find em
I did a quick search and found this which might help as we wait for someone to chime in on this interesting subject
http://www.ehow.com/about_6224517_audi-s4-vs_-rs4.html
http://forums.audiworld.com/showthread.php?t=2746206
You see both have a 4.2l engine, however:
"The S4 hits max torque and HP sooner. I've had pulls with a modded RS4 and a stock RS4. modded RS4 pulls slightly, stock RS4 pulls, barely. The pulling depends on the gear you are in vs the gear they are in.
To make the motor similar would be very, very expensive considering the RS4 motor is a total handbuilt quattro gmbh build. The throttle body, intake manifold, exhaust manifold, cylinders, bottom end, cams, etc. Not to mention the FSI components. That and the differentials in the RS4 have hypoid gear which an S4 does not. This allows 100% of available power to go to one specific wheel on the end that has the most grip.
I've gone the route of lighter wheels, filter, exhaust, ECU, suspension, brakes, differential, etc....and to tell you the truth, the difference is the driver. Hands down.
You can upgrade to the PES G4 supercharger for 8500, plus a few grand more for installation i am sure. It puts out 515hp and 465 Tq. Add stasis suspension and some alcons brakes, and you will walk all over any RS4 stock.
Once the RS4 hits 5500rpm it walks away from the S4 pretty easily. THere are a few videos out there. I try and find em
06-04-2012, 10:27 AM
#4
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Re: S4 vs RS4 ???
Hi, the video with mat farell is a real good one but the comparaison is bettween b7 rs4 and b8 s4.
The b8 s4 dont charming me in any point, i know its a real good car but i love v8 cars!!! My winter car is a volvo xc 90 v8, and it sound like thunder!!!
The b8 s4 dont charming me in any point, i know its a real good car but i love v8 cars!!! My winter car is a volvo xc 90 v8, and it sound like thunder!!!
06-07-2012, 03:31 PM
#6
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Re: S4 vs RS4 ???
RS4 is better in just about every category. Sorry S4 guys 
I used to have a B7 S4 for 3-4 years. So I'd consider myself qualified to answer.
exterior styling - RS4 is a few notches better. Widebody = win!
interior styling - identical really. Different shiftknob...that's about it. Full air leather wheel vs. just the sides on the S4 (this is worth zero points). Air leather ebrake handle for the RS4 (again, worth zero points). Tachometer goes to 9000 and speedo to 310 which is always good for a gasp from passengers. Slightly nicer carbon fibre trim but you can replicate that with a call to matt@ocarbon for a real carbon fibre trim that looks like the RS4 trim
engine - sweet heavenly goodness. Revs like crazy. All around awesome. Most impressive part? Forged pistons and rods. This means if you ever want to go big power, you can do so with the confidence that the engine can handle at least 500 wheel horsepower, probably closer to 600 whp.
sound - the RS4 has a slightly different profile, and the cams give it a great sound. B7 S4 also sounds awesome though. Can't really choose one that's better although I do prefer how the RS4 cammy sound is when it bounces off high rpms
handling - RS4 crushes my old S4. Onramps I was tilting and struggling to hold in the S4 are a breeze for the RS4. Where I could take ramp at 80-90 km in the S4, I'm comfortable at 100-110 in the RS4. It's neat. Not a big deal...just feels great. The wide W I D E stance helps as does DRC.
straight line performance - this is interesting. My B7 S4 had 2.5" catless JHM downpipes, 2.5" Fast Intentions catback, JHM 93+ tune, JHM LW rotors, JHM LW Crank Pulley and JHM Intake Spacers. Car was AWESOME. Beat all kinds of great cars. Ran a best of 12.99 @ 107.8 in the quarter mile. I was at the strip in the car probably 7-8 times, making 7-10 passes each time.
To be honest when I got the Rs4, I didn't think much of its performance in a straight line, having just stepped out of a B7 S4 that was basically equal to an RS4 performance wise. I took my Rs4 to the dragstrip and ran 13.1 one day, 12.9 another day, and then set the stock RS4 record dragstrip pass at 12.75 @ 108.36. Again though, not much of a difference between the RS4 and a properly modded B6/7 S4.
NOW...the thing is, with a tune, exhaust and a couple of lightweight parts, the RS4 runs low 12s @ 110-112 (12.26 @ 112.98 is the record for a non-supercharged car...he didn't even have a tune yet. Two other tuned cars ran 12.28-12.29 @ 112). I bet within a year we see an RS4 run 11s with just tune/exhaust/downpipes/clutch/flywheel etc. That's incredible from a small V8 in a 3900 lbs car.
Want to supercharge the S4? OK, but youre limited to 425 whp or so. Fastest supercharged S4s are running 11.9 @ 116 mph.
Want to supercharge the RS4? As I said earlier the RS4 engine can probably handle something like 550-575 whp comfortably. Heffner's twin turbo R8 on race fuel made 600 wheel horsepower, and the RS4/R8 share an engine. Fastest supercharged RS4s are making 500 whp (600 crank hp) and one just ran 11.4 @ 125 mph. that's enough to crush an R8 5.2 or Ferrari F430. It is seriously quick. That's on pump gas by the way.
We haven't even seen the tip of the iceberg as far as RS4 performance goes.
I used to have a B7 S4 for 3-4 years. So I'd consider myself qualified to answer.
exterior styling - RS4 is a few notches better. Widebody = win!
interior styling - identical really. Different shiftknob...that's about it. Full air leather wheel vs. just the sides on the S4 (this is worth zero points). Air leather ebrake handle for the RS4 (again, worth zero points). Tachometer goes to 9000 and speedo to 310 which is always good for a gasp from passengers. Slightly nicer carbon fibre trim but you can replicate that with a call to matt@ocarbon for a real carbon fibre trim that looks like the RS4 trim
engine - sweet heavenly goodness. Revs like crazy. All around awesome. Most impressive part? Forged pistons and rods. This means if you ever want to go big power, you can do so with the confidence that the engine can handle at least 500 wheel horsepower, probably closer to 600 whp.
sound - the RS4 has a slightly different profile, and the cams give it a great sound. B7 S4 also sounds awesome though. Can't really choose one that's better although I do prefer how the RS4 cammy sound is when it bounces off high rpms
handling - RS4 crushes my old S4. Onramps I was tilting and struggling to hold in the S4 are a breeze for the RS4. Where I could take ramp at 80-90 km in the S4, I'm comfortable at 100-110 in the RS4. It's neat. Not a big deal...just feels great. The wide W I D E stance helps as does DRC.
straight line performance - this is interesting. My B7 S4 had 2.5" catless JHM downpipes, 2.5" Fast Intentions catback, JHM 93+ tune, JHM LW rotors, JHM LW Crank Pulley and JHM Intake Spacers. Car was AWESOME. Beat all kinds of great cars. Ran a best of 12.99 @ 107.8 in the quarter mile. I was at the strip in the car probably 7-8 times, making 7-10 passes each time.
To be honest when I got the Rs4, I didn't think much of its performance in a straight line, having just stepped out of a B7 S4 that was basically equal to an RS4 performance wise. I took my Rs4 to the dragstrip and ran 13.1 one day, 12.9 another day, and then set the stock RS4 record dragstrip pass at 12.75 @ 108.36. Again though, not much of a difference between the RS4 and a properly modded B6/7 S4.
NOW...the thing is, with a tune, exhaust and a couple of lightweight parts, the RS4 runs low 12s @ 110-112 (12.26 @ 112.98 is the record for a non-supercharged car...he didn't even have a tune yet. Two other tuned cars ran 12.28-12.29 @ 112). I bet within a year we see an RS4 run 11s with just tune/exhaust/downpipes/clutch/flywheel etc. That's incredible from a small V8 in a 3900 lbs car.
Want to supercharge the S4? OK, but youre limited to 425 whp or so. Fastest supercharged S4s are running 11.9 @ 116 mph.
Want to supercharge the RS4? As I said earlier the RS4 engine can probably handle something like 550-575 whp comfortably. Heffner's twin turbo R8 on race fuel made 600 wheel horsepower, and the RS4/R8 share an engine. Fastest supercharged RS4s are making 500 whp (600 crank hp) and one just ran 11.4 @ 125 mph. that's enough to crush an R8 5.2 or Ferrari F430. It is seriously quick. That's on pump gas by the way.
We haven't even seen the tip of the iceberg as far as RS4 performance goes.
Last edited by sakimano; 06-07-2012 at 03:34 PM.
06-07-2012, 07:44 PM
#7
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Join Date: Apr 2012
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Re: S4 vs RS4 ???
Really tanks, you give me exactly the information i searching for.... Once my s4 is selling, i will go for an rs4. I had find one today, 2007 55000km for 40k$. I must admit that if i cant sell my s4 i will not cry, she is a real great car and like all of you i have put so much money in....
06-07-2012, 09:06 PM
#8
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Posts: 1,155
Re: S4 vs RS4 ???
yeah its easy to keep the very excellent S4
p.s. just in case anyone on the forum read the post about the PES supercharger, please ignore it. They are overpriced, underdeveloped and use an undersized supercharger. They will basically give you the same performance you'd get from a stock S4 with JHM tune, exhaust and downpipes. Within a tenth or so at the quarter mile...or within a car in a highway pull. The JHM tune/exhaust/downpipes will run you about $3000. The PES kit will be more like $12,000.
Even if it's free, pass on it. They don't have a very good reputation. Scratch that. They have a horrendous reputation.
The supercharger is an Eaton M90/HarrupMP90, which is good for forcing about 700 CFM of air full tilt...a.k.a. enough to make about 410-420 hp net of losses to drive the supercharger. This assumes it's not getting heatsoaked and straining.
On an RS4, you can see pretty quickly that this is completely useless. VF Engineering also used the Eaton M90, and again, skip. Useless. Why pay quadruple the price for gains you can get with your exhaust and tune? VF Engineering cancelled their M90 supercharger kit because it was such an epic failure (but not after screwing a bunch of people with a big bill and over-promised gains that never materialized).
APR also made a B6 S4 kit with an Eaton M90 5 years ago...the old 2 weeks jokes pertain to their ever delayed release of the product. APR sunk a bunch of money into it, realised they had made a huge mistake when they couldn't generate more than 330 wheel horsepower (but were going to have to charge $15,000 for the product...to make basically 20 whp over a tune/exhaust B6) and cancelled the thing without ever selling one. They ate a big shitburger...and kudos for making that tough (but correct) decision. If only they'd used an M112 or something from the get go!
And no, adding exhaust etc to the M90 won't help...the supercharger is maxed out around 700 CFM and no matter what, you can't make it displace more air, or turn more revolutions than it's own internal limit.
p.s. just in case anyone on the forum read the post about the PES supercharger, please ignore it. They are overpriced, underdeveloped and use an undersized supercharger. They will basically give you the same performance you'd get from a stock S4 with JHM tune, exhaust and downpipes. Within a tenth or so at the quarter mile...or within a car in a highway pull. The JHM tune/exhaust/downpipes will run you about $3000. The PES kit will be more like $12,000.
Even if it's free, pass on it. They don't have a very good reputation. Scratch that. They have a horrendous reputation.
The supercharger is an Eaton M90/HarrupMP90, which is good for forcing about 700 CFM of air full tilt...a.k.a. enough to make about 410-420 hp net of losses to drive the supercharger. This assumes it's not getting heatsoaked and straining.
On an RS4, you can see pretty quickly that this is completely useless. VF Engineering also used the Eaton M90, and again, skip. Useless. Why pay quadruple the price for gains you can get with your exhaust and tune? VF Engineering cancelled their M90 supercharger kit because it was such an epic failure (but not after screwing a bunch of people with a big bill and over-promised gains that never materialized).
APR also made a B6 S4 kit with an Eaton M90 5 years ago...the old 2 weeks jokes pertain to their ever delayed release of the product. APR sunk a bunch of money into it, realised they had made a huge mistake when they couldn't generate more than 330 wheel horsepower (but were going to have to charge $15,000 for the product...to make basically 20 whp over a tune/exhaust B6) and cancelled the thing without ever selling one. They ate a big shitburger...and kudos for making that tough (but correct) decision. If only they'd used an M112 or something from the get go!
And no, adding exhaust etc to the M90 won't help...the supercharger is maxed out around 700 CFM and no matter what, you can't make it displace more air, or turn more revolutions than it's own internal limit.
Last edited by sakimano; 06-07-2012 at 09:10 PM.
06-08-2012, 12:32 PM
#9
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Join Date: Mar 2012
Location: Fort St. John
Posts: 20
Re: S4 vs RS4 ???
yeah its easy to keep the very excellent S4
p.s. just in case anyone on the forum read the post about the PES supercharger, please ignore it. They are overpriced, underdeveloped and use an undersized supercharger. They will basically give you the same performance you'd get from a stock S4 with JHM tune, exhaust and downpipes. Within a tenth or so at the quarter mile...or within a car in a highway pull. The JHM tune/exhaust/downpipes will run you about $3000. The PES kit will be more like $12,000.
Even if it's free, pass on it. They don't have a very good reputation. Scratch that. They have a horrendous reputation.
The supercharger is an Eaton M90/HarrupMP90, which is good for forcing about 700 CFM of air full tilt...a.k.a. enough to make about 410-420 hp net of losses to drive the supercharger. This assumes it's not getting heatsoaked and straining.
On an RS4, you can see pretty quickly that this is completely useless. VF Engineering also used the Eaton M90, and again, skip. Useless. Why pay quadruple the price for gains you can get with your exhaust and tune? VF Engineering cancelled their M90 supercharger kit because it was such an epic failure (but not after screwing a bunch of people with a big bill and over-promised gains that never materialized).
APR also made a B6 S4 kit with an Eaton M90 5 years ago...the old 2 weeks jokes pertain to their ever delayed release of the product. APR sunk a bunch of money into it, realised they had made a huge mistake when they couldn't generate more than 330 wheel horsepower (but were going to have to charge $15,000 for the product...to make basically 20 whp over a tune/exhaust B6) and cancelled the thing without ever selling one. They ate a big shitburger...and kudos for making that tough (but correct) decision. If only they'd used an M112 or something from the get go!
And no, adding exhaust etc to the M90 won't help...the supercharger is maxed out around 700 CFM and no matter what, you can't make it displace more air, or turn more revolutions than it's own internal limit.
p.s. just in case anyone on the forum read the post about the PES supercharger, please ignore it. They are overpriced, underdeveloped and use an undersized supercharger. They will basically give you the same performance you'd get from a stock S4 with JHM tune, exhaust and downpipes. Within a tenth or so at the quarter mile...or within a car in a highway pull. The JHM tune/exhaust/downpipes will run you about $3000. The PES kit will be more like $12,000.
Even if it's free, pass on it. They don't have a very good reputation. Scratch that. They have a horrendous reputation.
The supercharger is an Eaton M90/HarrupMP90, which is good for forcing about 700 CFM of air full tilt...a.k.a. enough to make about 410-420 hp net of losses to drive the supercharger. This assumes it's not getting heatsoaked and straining.
On an RS4, you can see pretty quickly that this is completely useless. VF Engineering also used the Eaton M90, and again, skip. Useless. Why pay quadruple the price for gains you can get with your exhaust and tune? VF Engineering cancelled their M90 supercharger kit because it was such an epic failure (but not after screwing a bunch of people with a big bill and over-promised gains that never materialized).
APR also made a B6 S4 kit with an Eaton M90 5 years ago...the old 2 weeks jokes pertain to their ever delayed release of the product. APR sunk a bunch of money into it, realised they had made a huge mistake when they couldn't generate more than 330 wheel horsepower (but were going to have to charge $15,000 for the product...to make basically 20 whp over a tune/exhaust B6) and cancelled the thing without ever selling one. They ate a big shitburger...and kudos for making that tough (but correct) decision. If only they'd used an M112 or something from the get go!
And no, adding exhaust etc to the M90 won't help...the supercharger is maxed out around 700 CFM and no matter what, you can't make it displace more air, or turn more revolutions than it's own internal limit.
06-20-2012, 10:06 PM
#10
Audi Forum - Posts like an A5
Join Date: Mar 2010
Location: Toronto
Posts: 315
Re: S4 vs RS4 ???
Most other tuners for the v8 S4 only change like 10 to 20 (again, if memory serves. I am getting old after all).
Sakimano should chime in and correct me if I'm off base here.
P.S. Sakimano, I hate reading your S4/RS4 comparisons. Makes me angry at Audi every time for not bringing the RS4 Avant over...sigh...
