want to make 300 rwhp in an s4 n/a
11-27-11, 12:23 PM
#1
want to make 300 rwhp in an s4 n/a
I am going to start the rebuild on my 6 port n/a and I want to be making over 300 rwhp without a turbo. So here's my plan
During rebuild:
either a pineapple racing large street port or a pineapple racing full bridgeport
S5 lim,mim,uim
Throttle body porting
Cutsom cold air inkate system with cold air box
Full 2.5" exhaust (drivers side exit single can system)
advanced timing
New clutch and flywheel (stock flywheel has scortch marks from previous owner)
Aux ports mod
NGK iridium spark plugs (running ngk double platinum now)
Maybe bigger injectors??? (Not too sure on how big i should go)
And thats pretty much all ive got planned. Any ideas on what else ill need for more power let me know. Also thinking about an rtek 2.1 ecu. All ideas, suggestions welcome.
During rebuild:
either a pineapple racing large street port or a pineapple racing full bridgeport
S5 lim,mim,uim
Throttle body porting
Cutsom cold air inkate system with cold air box
Full 2.5" exhaust (drivers side exit single can system)
advanced timing
New clutch and flywheel (stock flywheel has scortch marks from previous owner)
Aux ports mod
NGK iridium spark plugs (running ngk double platinum now)
Maybe bigger injectors??? (Not too sure on how big i should go)
And thats pretty much all ive got planned. Any ideas on what else ill need for more power let me know. Also thinking about an rtek 2.1 ecu. All ideas, suggestions welcome.
11-27-11, 12:37 PM
#3
Old [Sch|F]ool
You will not make 300whp with ANY engine that has a remotely streetable exhaust.
300whp is extraordinarily unlikely with a 6 port under ANY conditions. It's hard enough with a good bridge or peripheral port engine (with race spec exhaust)!
Clarification: You can make it with a 20B.
further edit: Most of your "mod list" is pointless as it describes a lot of items that you will need to throw away.
300whp is extraordinarily unlikely with a 6 port under ANY conditions. It's hard enough with a good bridge or peripheral port engine (with race spec exhaust)!
Clarification: You can make it with a 20B.
further edit: Most of your "mod list" is pointless as it describes a lot of items that you will need to throw away.
11-27-11, 12:43 PM
#5
Old [Sch|F]ool
I'll wait for the part where someone says "OMG what a bunch of unsupportive haters" or some junk 
Seriously, though, we're talking 360-400 crank HP, which is more than the factory race 2-rotors were able to put out.
- Pete (hi, I'm rebuilding a TPI Chevy, i want to make 1100hp N/A)
Seriously, though, we're talking 360-400 crank HP, which is more than the factory race 2-rotors were able to put out.
- Pete (hi, I'm rebuilding a TPI Chevy, i want to make 1100hp N/A)
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11-27-11, 01:41 PM
#10
Full brideports will be fairly loud and IMO, not very street friendly when running the exhaust you need to really exploit them. That and your powerband is shifted into the 8-10k+ rpm range. But, you could see 210-230whp with the right supporting mods. The stock S4 intake IMO will be a failry large restriction when it comes to this, as well as the heavier lower compression rotors that will not take kindly to that sort of RPM. On my old S5 N/A with a large streetport, full exhaust and tuning done with just a SAFC I was in the mid 190whp range. Honestly without alot more time and $$ invested, thats pretty damn good for a friendly street N/A engine. I never personally played with S4 stuff all that much, so Im not quite sure how they will react power-wise to similar mods.
11-27-11, 01:50 PM
#11
sorry to burst the bubble but 3 rotors are already scarce. if you do not already have the basics for the 3 rotor motor then a few years down the road it likely won't happen. the major parts for the 3 rotor have been discontinued and are NLA.
Last edited by RotaryEvolution; 11-27-11 at 01:54 PM.
11-27-11, 02:06 PM
#12
Old [Sch|F]ool
Full bridgeports are not particularly loud...
At least, I've run a couple street ports and three half-bridge and one peripheral port all on the same exhaust system, and no engine was louder than another!
The problem is, the futher along the scale you go, you'll find that the more ported engines are less tolerant of a restrictive exhaust system! And it is VERY DIFFICULT to make an exhaust system that is both quiet, and non-restrictive! This isn't to say it can't be done, but there are many more failures than successes, and everybody's idea of acceptable is different.
My current deeply-relieved half-bridge is NOT as tolerant of the exhaust as my old non-relieved half bridge was! And the peripheral port just plain hated it! And most people say my car is way too loud... except for rotary people, who comment on how quiet it is.
Here's the pisser: By the time you restrict a high-overlap engine down to "quiet", it will often make LESS power than a street port, maybe even a stocker! That's why street ports are called street ports... they're as big as you can go and have the engine still tolerate a reasonably quiet exhaust system.
And why street ports tend to make more power than bridge ports, on street driven (by sane people
) vehicles.
Mind you, I'm the guy championing half-bridges! They just drive nice. But then, I can also shut my engine off by holding my hand over the exhaust for a couple seconds!
At least, I've run a couple street ports and three half-bridge and one peripheral port all on the same exhaust system, and no engine was louder than another!
The problem is, the futher along the scale you go, you'll find that the more ported engines are less tolerant of a restrictive exhaust system! And it is VERY DIFFICULT to make an exhaust system that is both quiet, and non-restrictive! This isn't to say it can't be done, but there are many more failures than successes, and everybody's idea of acceptable is different.
My current deeply-relieved half-bridge is NOT as tolerant of the exhaust as my old non-relieved half bridge was! And the peripheral port just plain hated it! And most people say my car is way too loud... except for rotary people, who comment on how quiet it is.
Here's the pisser: By the time you restrict a high-overlap engine down to "quiet", it will often make LESS power than a street port, maybe even a stocker! That's why street ports are called street ports... they're as big as you can go and have the engine still tolerate a reasonably quiet exhaust system.
And why street ports tend to make more power than bridge ports, on street driven (by sane people
) vehicles.Mind you, I'm the guy championing half-bridges! They just drive nice. But then, I can also shut my engine off by holding my hand over the exhaust for a couple seconds!
11-27-11, 03:07 PM
#13
I'm getting a lot of good advice from here.
Karack: even if the 3 rotor gets even more scarce, I'm sure if you look in the right place, you'll find one. It's just a matter of applying yourself haha (but dont take that from me)
Rxmfn: I'm not too sure how the motor will react to a bridgeport either. It'll be a learning experience for me.
Peejay: It seems you've had your fair share of bridgeports an pp rotaries lol. And is sucks that you can shut your car off like that.
Karack: even if the 3 rotor gets even more scarce, I'm sure if you look in the right place, you'll find one. It's just a matter of applying yourself haha (but dont take that from me)
Rxmfn: I'm not too sure how the motor will react to a bridgeport either. It'll be a learning experience for me.
Peejay: It seems you've had your fair share of bridgeports an pp rotaries lol. And is sucks that you can shut your car off like that.
11-27-11, 04:16 PM
#16
Old [Sch|F]ool
11-28-11, 01:28 PM
#20
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Full bridgeports are not particularly loud...
At least, I've run a couple street ports and three half-bridge and one peripheral port all on the same exhaust system, and no engine was louder than another!
The problem is, the futher along the scale you go, you'll find that the more ported engines are less tolerant of a restrictive exhaust system! And it is VERY DIFFICULT to make an exhaust system that is both quiet, and non-restrictive! This isn't to say it can't be done, but there are many more failures than successes, and everybody's idea of acceptable is different.
And most people say my car is way too loud... except for rotary people, who comment on how quiet it is.
Mind you, I'm the guy championing half-bridges! They just drive nice. But then, I can also shut my engine off by holding my hand over the exhaust for a couple seconds!
At least, I've run a couple street ports and three half-bridge and one peripheral port all on the same exhaust system, and no engine was louder than another!
The problem is, the futher along the scale you go, you'll find that the more ported engines are less tolerant of a restrictive exhaust system! And it is VERY DIFFICULT to make an exhaust system that is both quiet, and non-restrictive! This isn't to say it can't be done, but there are many more failures than successes, and everybody's idea of acceptable is different.
And most people say my car is way too loud... except for rotary people, who comment on how quiet it is.
Mind you, I'm the guy championing half-bridges! They just drive nice. But then, I can also shut my engine off by holding my hand over the exhaust for a couple seconds!
i'm on exhaust system #2, and since it lasted 16 miles, i'm going to redo it again. i think i'm going to wait until it melts off the car though, i'm being lazy. system #3 will be built on the dyno, and THEN i go muffler shopping....
i can put my foot over the exhaust on the P port and it doesn't make a difference, but i think that's because the exhaust can just go out the intake (or around the engine again).
i'm the guy championing the P port, it drives nice! it's loud, but the butt dyno says i'm in the 170-180hp range, the power band is 2500-6000rpm, i could tow with it. so i'm making 50hp more than a stock 12A, but there's still another 50hp in it with a decent air cleaner and better exhaust.
11-28-11, 04:52 PM
#22
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well its only 2 pieces, the header and the rest, but yeah it might leak, but it also might go around the engine again, or it might just go out the carb...
11-28-11, 06:45 PM
#24
Old [Sch|F]ool
Plus, the current (alleged
) top dog bridge ports, power wise, do not extend into the water seals (Australian IPRA), I question the utility as well... Good exhaust and GOOOD intake are key.