Btw, you're not gonna make that beast breathe through a stock exhaust system are you?
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2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
It should be shiny, it's brand new. To the tune of $8K!
Quote:
Originally Posted by ike84
Btw, you're not gonna make that beast breathe through a stock exhaust system are you?
Yep. It would be hard to improve the exhaust manifold design, plus they want a crapton of $$$ for headers. Don't want to deal with cels by going to 200 cel cats. AND I have PSE. She'll breathe the way the good DR intended.
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
If you're gonna break it in on a Dyno, will you please humor me and test out a catless or high flow cat system? Also, I don't know what intake you're using but anything smaller than 82mm would be a mistake I think
Here's why I say this -
When I redid my 2.7l with a short ram 82mm intake, high flow headers and shorty glass packs, and run on oem 996 row fuel maps, my LTFTs are -17% (with afrs of 14.7 cruising and 11-12 wot). I've never dynoed my car but if the fuel consumption is linear to power output, that means that my car is now making 245 hp. I can almost guarantee that using the stock intake and exhaust will rob you of a significant amount of power output.
That system just wasn't designed to breathe - it was designed to meet stringent exhaust and nose control regulations (especially in the eu). If you look at recommendations for exhaust tubing size based on HP, the 986 system is undersized even for the 207 hp mark. You're probably looking to produce 300-350 hp right? You should have a 2.5" dual exhaust system for a 3.8l displacement. In terms of intake, depending on your gearing and again assuming 3.8l with 85% ve and 7200rpm redline, you need a 4.25" intake to completely eliminate all resistance (this isn't factoring bends and recessive length).
Don't get me wrong, I'm not trying to criticize, I'm just wanting to relay my experience. A really simple test would be the following - after break in, do a Dyno wot pull and calculate power outputs. After that, disconnect the intake and hook up your maf to an 82mm housing and nothing else. Disconnect your exhaust and put on only a pair of cheap eBay catless headers with your precats nbo2 sensors installed. Run for a bit like this again on the dyno to allow to ecu to recalibrate to your changes and then repeat your wot pulls
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2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
Good info Ike and much appreciated. I understand what you're saying.
Here's the tail of the tape. I have an IPD plenum and GT3 throttle body already on the top end. I'm recently officially retired for 1 yr now although I've been semi-retired for 5 yrs before that. Cash flow is an issue since income is now more important than when I was employed. The initial est for this job was $23K but I'm fairly certain the final number will be somewhere around $26-27K. The "while you're in there's" will prob be around $2K of that total. Toss in the $8K trans that was only supposed to be $2500 (not part of the orig $23K est) and you see the project is WAY over budget as it currently sits. No room for an additional $5K for headers / cats, etc. Maybe down the road.
I'm not sure if the guys at SLM will want to take the time to do exhaust swaps and multiple runs to compare. They probably want their big check too since this has been an 11 mo adventure. And I know they're backed up with work since it took them 2 wks to get to my car after the engine arrived back in OMA. They said they're already short a mechanic and 1 was out sick for a period of time. Bottom line is they're probably just as happy to see Sydney out the door as I will be.
__________________
GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
I hear ya, sometimes wants can't always line up with needs.
Fwiw, I can send you the parts list for building a 2.5" exhaust setup. The only part that will need to be fabbed is a 2 to 2.5" adapter which is paid a buddy $25 and took him 30 min. All together my setup cost me under $500, including the headers midpipes cats mufflers and tips, with everything being enamel coated and then wrapped in heat wrap.
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__________________
2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
__________________
2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
It's been almost a yr. Her engine was pulled June 1 of last yr. She really runs well now. Seems to have more of a growl than my Box, which also has PSE. I'm so happy.
But I won't be able to put another 1000 mi on her for an oil change and trans fluid change before next week's DE. Can't have everything, I guess.
Daytona in the fall!
__________________
GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
I feel ya on the move. Wants vs needs, again, lol. Good luck to you
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2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
Ever since I got Sydney back, I've been wanting to put the clear engine cover on. Trouble is, with the move, I can't find the mounting pins. I know where the cover itself is, but can't locate the pins. I know they made the move as they rolled around in the trunk of my moving vehicle for about a wk. But I finally took them out and placed them somewhere and now I can't find them. I've probably spend at least 2 full hrs looking. Generally I can remember what box has stuff in it and remember where the box is in the basement. But this wasn't in a box, I put them somewhere. My next thing is to look where my 1st inclination to put them. That's generally worked. But not for those stinking pins. Dog gone it!
Then 2 days ago I found them. I'd put them in an upstairs room of stuff that we didn't sell for my mom's estate sale (I'm moving into her house). I guess my thought process was I'd be moving items out of that room not long after I moved there. Well it was 10 days, so I guess that was close. Anyway, the pins are found and now I can show off my $28K engine.
__________________
GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
Obviously a tad louder in the cabin with the foam and carpet removed, but certainly not intrusive. The new engine actually sounds better. The orig had a whooshing sound in the 2500-3500 rpm range that you could hear quite clearly with the clear cover on. That whoosh is gone, replaced with sweet revving sounds now.
__________________
GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
I've probably spend at least 2 full hrs looking. Generally I can remember what box has stuff in it and remember where the box is in the basement. But this wasn't in a box, I put them somewhere. My next thing is to look where my 1st inclination to put them. That's generally worked. But not for those stinking pins. Dog gone it!
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