Add a little "power" to my DD engine

Pettersen · 01-29-2012, 05:26 AM

So i got a stock S4 N/A engine i use to DD while i'm building a Semi PP N/A engine.

And since i'm fairly new to rotaries i wonder if there is anything i can do with the S4 engine that would gain me some extra power without being expensive, since i need to put all money in to the Semi PP build.

Already have uprated exhaust,TB mod and a previous owner changed out the filterbox with an open filter, anything else i could do? My only idea is to build a proper CAI, since the setup now probably isn't optimal.

Mazdabater · 01-29-2012, 05:59 AM

Nope, given whats done that's about all you can do. I don't think theres anything really wrong with the factory airbox. Even if you did change that your not going to get a noticeable result.

Pettersen · 01-29-2012, 08:15 AM

hmm, to bad. Will just need to get the semi pp engine finished as soon as possible then, tho i doubt it will be done until the summer of 2013.

***TitaniumTT*** · 01-29-2012, 11:04 AM

Full exhaust is the best thing to do. A header will gain you the most power on an n/a engine

My5ABaby · 01-29-2012, 11:07 AM

CAI will help some. Biggest gain would be from going to an aftermarket computer, eg Haltech.

Pettersen · 01-29-2012, 11:57 AM

I have an rotaryworks 2,25" header, and the rest is more or less straight 3" pipes with 2 mufflers, and one buttplug from hell(to keep the noise down on the norwegian version of emissions, and i haven't bothered removing it yet since i suspect the car is way to noisy without it, but i'm planning on building a new muffler with a bypass/cutout valve)

I'm going to buy Haltech sport 1000 for the semi pp build, but i guess i could make that a priority, since i plan on using it on both engines anyway.

My5ABaby · 01-29-2012, 02:49 PM

You'll be able to lean it out some but also make the timing more aggressive.

Pettersen · 01-29-2012, 04:35 PM

Guess i will make it a priority then.

My5ABaby · 01-29-2012, 10:30 PM

All that said, I still wouldn't expect much from the engine.

Pettersen · 01-30-2012, 11:51 AM

I know, but every little bit helps

Pettersen · 02-09-2012, 06:43 AM

How much of a difference would itb's make on the stock engine?

I'm thinking i would loose hp, but not shure how much.. Either way, this won't be for performance reasons but because i'm going to run itb's on the semi pp engine, and i want everything as similar as possible, since it will make it easyer when i change engines in and out of the car. Plan on having one big plug for everything on the engine, and one harness on each engine, that way i don't have to take a single piece of the engine, just unhook the cable, motormounts and it's out.

C. Ludwig · 02-09-2012, 10:59 AM

ITBs aren't going to give you much, if anything. The big bottle neck with the NA engines is always the exhaust. If you're running a silencer in the tail pipe as you described, it's knocking down a good deal of top end power. Very hard to make NA power without having a ridiculously loud car.

ITBs should give you a little crisper throttle response, if setup properly. Maybe a couple HP up top, depending on how everything else is matched. Probably lose a small amount of power through the low and mid range. All in all, I would be surprised if you saw +/- 5 HP anywhere in the curve.

Pettersen · 02-09-2012, 01:22 PM

Great, sounds like there isn't any realy big downside to it then

I realy need to figure out how to build a sound dampening but very little restrictive muffler.

Would a cutout valve solve any proplems, like opening it when i want to drive fast and closed for city driving. Or would i need one map for closed and one for open, or having it controlled by an rpm switch?

89Rotary · 03-13-2012, 02:14 PM

you could try 6 Port Sleeve Inserts. Like from pineapple racing or i believe Atkins and Racing beat sell them too. the New Rx8's come stock with em. and its a simple install. all you gotta do is remove the LIM and toss em in. and supposedly its an instant 5 - 10 hp increase. i can't vouch for the HP increase. but it makes sense since your smoothing out the airflow from your 5/6 ports

01-29-2012, 05:26 AM	#1
Pettersen Rotary Fanatic Join Date: Mar 2010 Location: Norway iTrader: (0) Posts: 163 Rep Power: 15	Add a little "power" to my DD engine So i got a stock S4 N/A engine i use to DD while i'm building a Semi PP N/A engine. And since i'm fairly new to rotaries i wonder if there is anything i can do with the S4 engine that would gain me some extra power without being expensive, since i need to put all money in to the Semi PP build. Already have uprated exhaust,TB mod and a previous owner changed out the filterbox with an open filter, anything else i could do? My only idea is to build a proper CAI, since the setup now probably isn't optimal.

01-29-2012, 11:04 AM	#4
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	Full exhaust is the best thing to do. A header will gain you the most power on an n/a engine __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

01-29-2012, 11:07 AM	#5
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (6) Posts: 2,377 Rep Power: 19	CAI will help some. Biggest gain would be from going to an aftermarket computer, eg Haltech. __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

01-29-2012, 11:57 AM	#6
Pettersen Rotary Fanatic Join Date: Mar 2010 Location: Norway iTrader: (0) Posts: 163 Rep Power: 15	I have an rotaryworks 2,25" header, and the rest is more or less straight 3" pipes with 2 mufflers, and one buttplug from hell(to keep the noise down on the norwegian version of emissions, and i haven't bothered removing it yet since i suspect the car is way to noisy without it, but i'm planning on building a new muffler with a bypass/cutout valve) I'm going to buy Haltech sport 1000 for the semi pp build, but i guess i could make that a priority, since i plan on using it on both engines anyway. Last edited by Pettersen; 01-29-2012 at 11:59 AM..

01-29-2012, 02:49 PM	#7
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (6) Posts: 2,377 Rep Power: 19	You'll be able to lean it out some but also make the timing more aggressive. __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

01-29-2012, 05:59 AM	#2
Mazdabater FC3S Join Date: Jun 2010 Location: Townsville, QLD, AUS iTrader: (0) Posts: 326 Rep Power: 15	Nope, given whats done that's about all you can do. I don't think theres anything really wrong with the factory airbox. Even if you did change that your not going to get a noticeable result.

01-29-2012, 08:15 AM	#3
Pettersen Rotary Fanatic Join Date: Mar 2010 Location: Norway iTrader: (0) Posts: 163 Rep Power: 15	hmm, to bad. Will just need to get the semi pp engine finished as soon as possible then, tho i doubt it will be done until the summer of 2013.

01-29-2012, 04:35 PM	#8
Pettersen Rotary Fanatic Join Date: Mar 2010 Location: Norway iTrader: (0) Posts: 163 Rep Power: 15	Guess i will make it a priority then.

01-29-2012, 10:30 PM	#9
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (6) Posts: 2,377 Rep Power: 19	All that said, I still wouldn't expect much from the engine. __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

01-30-2012, 11:51 AM	#10
Pettersen Rotary Fanatic Join Date: Mar 2010 Location: Norway iTrader: (0) Posts: 163 Rep Power: 15	I know, but every little bit helps

02-09-2012, 06:43 AM	#11
Pettersen Rotary Fanatic Join Date: Mar 2010 Location: Norway iTrader: (0) Posts: 163 Rep Power: 15	How much of a difference would itb's make on the stock engine? I'm thinking i would loose hp, but not shure how much.. Either way, this won't be for performance reasons but because i'm going to run itb's on the semi pp engine, and i want everything as similar as possible, since it will make it easyer when i change engines in and out of the car. Plan on having one big plug for everything on the engine, and one harness on each engine, that way i don't have to take a single piece of the engine, just unhook the cable, motormounts and it's out.

02-09-2012, 10:59 AM	#12
C. Ludwig Rotary Masochist Join Date: May 2008 Location: Floyds Knobs, IN iTrader: (5) Posts: 494 Rep Power: 17	ITBs aren't going to give you much, if anything. The big bottle neck with the NA engines is always the exhaust. If you're running a silencer in the tail pipe as you described, it's knocking down a good deal of top end power. Very hard to make NA power without having a ridiculously loud car. ITBs should give you a little crisper throttle response, if setup properly. Maybe a couple HP up top, depending on how everything else is matched. Probably lose a small amount of power through the low and mid range. All in all, I would be surprised if you saw +/- 5 HP anywhere in the curve. __________________ _______________________________________________ *One stop Haltech, AEM, Syvecs shopping. Installation and tuning.* http://www.lms-efi.com *Free support. Drop us an email.* chris@lms-efi.com 502-515-7482 Facebook @LMS-EFI

02-09-2012, 01:22 PM	#13
Pettersen Rotary Fanatic Join Date: Mar 2010 Location: Norway iTrader: (0) Posts: 163 Rep Power: 15	Great, sounds like there isn't any realy big downside to it then I realy need to figure out how to build a sound dampening but very little restrictive muffler. Would a cutout valve solve any proplems, like opening it when i want to drive fast and closed for city driving. Or would i need one map for closed and one for open, or having it controlled by an rpm switch?

03-13-2012, 02:14 PM	#14
89Rotary GTUs 6 Port Join Date: Feb 2009 Location: Avondale, AZ iTrader: (0) Posts: 47 Rep Power: 0	you could try 6 Port Sleeve Inserts. Like from pineapple racing or i believe Atkins and Racing beat sell them too. the New Rx8's come stock with em. and its a simple install. all you gotta do is remove the LIM and toss em in. and supposedly its an instant 5 - 10 hp increase. i can't vouch for the HP increase. but it makes sense since your smoothing out the airflow from your 5/6 ports __________________ Jake B "Built NEVER Bought" 1989 Mazda FC3S GTUs *TII Swap In Progress* "Days Of Spoken Legend Has Come To An End, The Curtain Of The New Rotary Era Has Been Raised"