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Old 01-19-2018, 01:06 PM   #1
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Baseline dyno done, let the mods begin!




2004 Boxster S (not special edition) rated at 258 HP (flywheel).
Got 224.2 HP at the wheel from stock motor (only mods to date are deep sump and UDP). This is a 13% drop from Porsche's flywheel rating which seems very reasonable. I am very pleased with this result.
Mods planned are 987 air box, 987 MAF, 74mm TB, 987 plenum, secondary cat bypass and 986 special edition tune (DME 7.8).
My goal is to bring all this in for under $1000 Canadian!!
I will post my results.
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987 air intake TB and plenum, Mantissport 2 litre sump, UDP, Bilstein B6 with H&R lowering spings, re71-rs for track, other stuff.
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Old 01-19-2018, 01:14 PM   #2
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I look forward to seeing results! I have an 01 S all factory (except K&N air). My initial thoughts are IPD Plenum, 74 MM TB and exhaust (no headers) are where the Best Bang for The Buck is at, but anywhere from $1500 - $3000K US
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Old 01-19-2018, 05:12 PM   #3
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Real data makes all of the difference in the world!

And that is a very strong engine - how many miles?

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Old 01-19-2018, 06:34 PM   #4
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Yes, it was better than I had hoped for! It has about 70k miles on it. The tuner said that as well: Very healthy engine! Iím looking forward to doing these modifications. My local Porsche dealer service tech is looking into pushing the Special Edition tune. (You never know if you donít ask!). Letís hope that it works!
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2004 986 S
987 air intake TB and plenum, Mantissport 2 litre sump, UDP, Bilstein B6 with H&R lowering spings, re71-rs for track, other stuff.
https://www.youtube.com/user/12shoes2
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Old 01-19-2018, 08:27 PM   #5
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Awesome!
I haven't dynoed mine yet but plan on doing it soon (before COTA in Feb.)
My mods are very similar to what you want except for the 987 airbox, and I have a VR race tune. I also have a 3.2 factory reman engine (2006) with the big bearing, so I don't know if that is 258 HP stock or not. But if it is, I think I'm somewhere in the 290-295 HP at the crank. With 100 octane race gas, it might be slightly more, but it scoots on the track! I think you'll be pleasantly surprised. Not sure though if the 2004 SE tune will take advantage of all those mods. Hope it does!

Here are my thoughts:

Stock 258 HP (maybe more since 2006 was 280HP)
Tune +15 HP
74 mm TB + IPD plenum + 15 HP
Secondary bypass + 5 HP

Total ~ 293 HP crank (maybe a couple more on 100 octane fuel)
And the UDP might release a couple more to the wheels...
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2002 Boxster S - NHP 200 Cell Headers,test pipes,Borla CatBack,Competition Plenum,74 mm TB, EVOMS Tune,Tarett UDP,Eibach Swaybars,H&R Sport Springs,TuneRS rear toe links,wheel studs,15 mm wheel spacers on all 4,EBC yellow stuff pads,Sebro rotors, EBS oil baffles,160 deg Thermostat,2 quart Accusump,full filtration remote oil filter,rad fan switch,custom gauge/switch plate, Race Capture data logging, 80K miles
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Old 01-20-2018, 12:51 PM   #6
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Quote:
Originally Posted by AZ986S View Post
Awesome!
I haven't dynoed mine yet but plan on doing it soon (before COTA in Feb.)
My mods are very similar to what you want except for the 987 airbox, and I have a VR race tune. I also have a 3.2 factory reman engine (2006) with the big bearing, so I don't know if that is 258 HP stock or not. But if it is, I think I'm somewhere in the 290-295 HP at the crank. With 100 octane race gas, it might be slightly more, but it scoots on the track! I think you'll be pleasantly surprised. Not sure though if the 2004 SE tune will take advantage of all those mods. Hope it does!

Here are my thoughts:

Stock 258 HP (maybe more since 2006 was 280HP)
Tune +15 HP
74 mm TB + IPD plenum + 15 HP
Secondary bypass + 5 HP

Total ~ 293 HP crank (maybe a couple more on 100 octane fuel)
And the UDP might release a couple more to the wheels...
Here are some facts: A 2000-2002 engine factory rebuilt in 2006 will be identical to a 2002 engine with the exception of the 2006 design IMSB.

To increase engine power you must get more air into it & then mix in the proper amount of additional fuel. 987 air filter housing is the key component for that.
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Old 01-20-2018, 01:56 PM   #7
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Been there done that. Dream on if you think you will make +35bhp from those mods.
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Old 01-20-2018, 02:12 PM   #8
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Quote:
Originally Posted by edc View Post
Been there done that. Dream on if you think you will make +35bhp from those mods.
I would agree that this sounds a bit too optimistic!
I am hoping to make some modest gains, maybe 6 or 8. If I don't get that, so be it. I will have concrete results on this modification with dyno evidence to pass on to the community.
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2004 986 S
987 air intake TB and plenum, Mantissport 2 litre sump, UDP, Bilstein B6 with H&R lowering spings, re71-rs for track, other stuff.
https://www.youtube.com/user/12shoes2
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Old 01-20-2018, 05:32 PM   #9
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But yeah... Like I said, I'll get a dyno run soon.
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2002 Boxster S - NHP 200 Cell Headers,test pipes,Borla CatBack,Competition Plenum,74 mm TB, EVOMS Tune,Tarett UDP,Eibach Swaybars,H&R Sport Springs,TuneRS rear toe links,wheel studs,15 mm wheel spacers on all 4,EBC yellow stuff pads,Sebro rotors, EBS oil baffles,160 deg Thermostat,2 quart Accusump,full filtration remote oil filter,rad fan switch,custom gauge/switch plate, Race Capture data logging, 80K miles
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Old 01-22-2018, 05:42 AM   #10
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Quote:
Originally Posted by NewArt View Post
I would agree that this sounds a bit too optimistic!
I am hoping to make some modest gains, maybe 6 or 8. If I don't get that, so be it. I will have concrete results on this modification with dyno evidence to pass on to the community.
It will be interesting to compare. Here's mine for comparison Tuned/modified 2000 Boxster S If I can ever be bothered to get the at the wheels figures all on the same chart I would but give this is my old car I've never found the motivation to do it!
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Old 01-22-2018, 08:32 AM   #11
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Quote:
Originally Posted by edc View Post
It will be interesting to compare. Here's mine for comparison Tuned/modified 2000 Boxster S If I can ever be bothered to get the at the wheels figures all on the same chart I would but give this is my old car I've never found the motivation to do it!
Thanks. I'm a little unclear on your dyno graph. Are they BHP or WHP? BHP = crank horsepower.
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2002 Boxster S - NHP 200 Cell Headers,test pipes,Borla CatBack,Competition Plenum,74 mm TB, EVOMS Tune,Tarett UDP,Eibach Swaybars,H&R Sport Springs,TuneRS rear toe links,wheel studs,15 mm wheel spacers on all 4,EBC yellow stuff pads,Sebro rotors, EBS oil baffles,160 deg Thermostat,2 quart Accusump,full filtration remote oil filter,rad fan switch,custom gauge/switch plate, Race Capture data logging, 80K miles
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Old 01-22-2018, 08:50 AM   #12
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Thanks for the lesson on what BHP is Those figures are all converted to flywheel figure. I do have the at wheels figures too, just not all on the same graph. I don't have this car any more so despite me knowing the dyno owner and him being 5 mins drive away, I haven't bothered to get all the at the wheels figures onto one graph.
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Current: 550 Spyder Anniversary- Carnewal exhaust - 100 cell cats - stainless manifolds - 4" underdrive pulley - poly gearbox mounts - rear lower alu brace - adjustable rear toe links
Sold: 986S - Zenith Blue - 18" Sport Classics - Black Zunsport grilles - Stainless silencer and manifolds - K&N panel - shortshift - M030 suspension - 75mm throttle body - custom 83mm intake - SmartTop - custom remap - MDS underdrive pulley
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Old 01-22-2018, 12:50 PM   #13
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It seems to me that in the end, torque and power delivered to the wheels is really the only thing that is important unless one is planning a major drivetrain change. Horsepower at the flywheel is more important to the marketers than in the real world.
Oh yes, and I did get that bloody airbox out! Fun fun fun!
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2004 986 S
987 air intake TB and plenum, Mantissport 2 litre sump, UDP, Bilstein B6 with H&R lowering spings, re71-rs for track, other stuff.
https://www.youtube.com/user/12shoes2
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