09-30-2007, 02:19 PM
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#1
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Registered User
Join Date: Sep 2007
Location: Nurembourg
Posts: 1
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Top 5 mods to add HP
Hi I am new to the forum, and love all the cars I have seen on here. simply amazing. I am looking at purchasing a 986, but want to know what I could do to add some HP, as it is my understanding that the base models are not the fastest car on the block. Let me know what you guys think? thanks
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09-30-2007, 02:33 PM
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#2
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Guest
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1. Buy the S
2. supercharge
3. intake
4. headers
5. muffler
6. decrease weight
7. the blade
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09-30-2007, 02:40 PM
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#3
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Guest
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what year and model?
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09-30-2007, 02:40 PM
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#4
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Porscheectomy
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
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Quote:
Originally Posted by boggtown
7. the blade
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LOL. Almost as good a boost as the tornado.
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09-30-2007, 04:47 PM
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#5
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Registered User
Join Date: Jul 2006
Location: Virginia
Posts: 916
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I would encourage you to first work on the suspension, then see if you need any more HP, its pretty amazing what some folks can do with their Boxsters with stock engines...
Ed
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My Car Webpage
2000 2.7L Boxster 102K; TTP intake, headers, high-flow cats; Dansk high-flow muffler; Autothority ECU chip; TechnoTorque 2; Bilstein coilovers; Racing Dynamics strut brace; stress-bar suspension kit; Aasco lightweight flywheel, B&M short shiftkit; 18" wheels; spare tire delete; OEM GT3 seats; JL audio speakers and subwoofer; Alpine PDX-5/PDX-2 amps; Kenwood DNX8120 CD/DVD/Nav; litronics, deambered
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09-30-2007, 05:35 PM
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#6
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Registered User
Join Date: Oct 2005
Location: Seattle
Posts: 352
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There aren't many more than 5 things to do to increase HP short of engine conversion or forced induction. If your very first thought after purchase is dramatically increasing HP than this may not be the car for you. You can achieve some noticeable gains by:
1) cold air intake
2) some form of modified exhaust (be wary of side effects such as resonance)
3) ECU tuning
Pretty standard recipe.
I have gained just as much or more pleasure from the short shifter and the suspension upgrades. I have also found that the potential in these cars is further realized the better driver you become. I have had better drivers race my car and I am humbled. All the HP in the world wouldn't help me keep up with these guys.
Lots of luck to you.
__________________
2000 Black Boxster S
EVO Intake & GIAC Tuning
Headers & Porsche Sport Exhaust System
ROW M030 Suspension
Front & Rear Strut Braces
B&M Short Shift & EVO Billet Linkage
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09-30-2007, 05:45 PM
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#7
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Guest
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Tripbox, work on becoming a better driver, and use the HP the Boxster already has.
I am learning every time I take mine out. Learned a ton today on the race track.
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10-01-2007, 04:02 PM
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#8
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Registered User
Join Date: Jun 2007
Location: Ohio
Posts: 307
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If you havnt bought a box yet, and your already thinking about HP upgrades, you better get the S. 2nd, if you really want more hp, spend the money and get a 987 S, its the easiest way to get hp out of your box. Many mods give very little hp, some exhaust mods are known to actually decrease hp.
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10-01-2007, 07:02 PM
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#9
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Registered User
Join Date: Sep 2006
Location: chicago
Posts: 3,510
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definitely a wrong car for power increase, other than FI.
work on suspension, short shifter, loosing weight, and it will be MUCh better car to drive.
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colormatched bumperettes::Top Speed Pro-1 exhaust::
my cardomain/pictures page
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10-02-2007, 09:33 AM
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#10
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Registered User
Join Date: Feb 2006
Location: Poway, CA
Posts: 191
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haha
can't believe nobody mentioned the 996 engine swap. Not exactly bolt on, but close!
__________________
Arctic Silver 2000 Boxster 3.4l w/Sport Design Package
Supersprint Boxster S Headers/Cats/Muffler
AASCO Lt. Wt FLywheel
Evo Intake
Partial Carbon Interior
Black Leather Sport seats
M030 Sway Bars
Litronics w/ Clear Corners
Boxster S brakes
B&M Short Shifter
PnP rear Speakers + Amp
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10-02-2007, 11:09 AM
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#11
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Registered User
Join Date: Jul 2004
Location: Houston, Texas
Posts: 7,243
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One only needs one sizeable mod to make one's ride really fast.
Trade in the boxster for a Z06.
Our cars really aren't designed for straight-line performance.
I've been salivating for a TT or a SC kit for my 2.5 for three years now, but when I drive it hard on country twisties I realize I simply do not need more power. Putzing around from light to light in town I always feel underpowered.
So I just stopped putzing around town and I'm feeling much better about my NA 2.5. It actually has tons of power for what it was designed to do.
The guys in the S's behind me on the Tail of the Dragon trip said I was every bit as quick as they were and no easier to keep up with than other boxsters with 3.2's and 3.4's in them.
I say add strut tower braces and lowering springs (and new struts if you the one you buy is over 60k mileage) and you'll be amazed at how well the car will perform around corners, where it was designed to be used.
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10-02-2007, 12:22 PM
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#12
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Registered User
Join Date: Dec 2005
Location: Coppell, TX
Posts: 317
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I totally agree with Randall. I had my 2.5 up in the mountains last weekend and had a motorcycle guy behind me for about 15 miles. At an opportune stopping point he came up to me and said he couldn't believe the speeds I was negotiating the turns and twisty roads. The power band on these older Boxsters is still quite amazing and the handling is why we drive this car. I just turned 23,000 miles and this thing is bullet proof so far. (except for the roof cables!) Seems the deal with a 2.5 is RPM management, that's why it's so much fun!
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"97 Boxster" Guards Red, Coppell, TX 36,500 miles
2010 Mazda CX-7 AWD, Turbo, Grand Touring
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10-02-2007, 02:32 PM
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#13
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Registered User
Join Date: Sep 2006
Location: Montreal
Posts: 502
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HI, I bought the car for it's curves and the ones up ahead
Lower strut brace is one mod I'd recommend
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1997 Porsche Boxster manual
2018 Subaru WRX Sport Tech
2014 Honda CRV
2014 Mercedes Benz 350 ML
2015 Chevrolet Corvette Stingray manual
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11-06-2007, 08:16 PM
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#14
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Registered User
Join Date: Aug 2007
Location: Calgary, AB
Posts: 13
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I have a 99 Box and I added the powerflow cold air intake and power intake plenum (available from ************************************************************) this winter I plan on chipping it, updating the suspension and cooling system (GT3 center rad and bumper) along with the below that I'm wondering if anyone has done.
Has anyone added any of the following:
Adjustable fuel pressure regulator?
Aux Oil cooler & stat?
Silicon hoses (Samco)?
Since I added the two above mods I've been experiencing some cooling system issues so I've been doing some research trying to find the root cause and am looking for some feedback. One of the interesting things I found was when increasing HP the fuel pressure regulator needs to keep up, if it doesn't the engine runs slightly lean causing the engine to heat up more than normal, in the event of a failed or failing FPR this is definately the cause along with poor fuel economy, sluggish throttle response etc. So, that got me thinking that if the engine is going to run hotter than normal during normal conditions when I'm really leaning on her she's going to heat higher than normal.
I know that Porsche engineers will have a safety factor considered when designing the cooling system but given age that factor decreases and plastic/rubber breaks down. Higher heat also equals higher pressure which I think may be the reason why my car will puke coolant out after a hard drive.
I'm rambling a bit but I'm looking for some feedback, one thing I did notice was a lot of people here are having problems with their cooling system and I'm wondering what the probability that it's performance upgrades that are the root cause.
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Link Jones
99 Boxster, cold air intake, throttle body plenum
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11-06-2007, 09:49 PM
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#15
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There Is No Substitute.
Join Date: May 2007
Location: West Coast
Posts: 3,253
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If you are concerned with HP and straight line acceleration you bought the wrong car.
These cars accelerate plenty fast, and handle better than most other high HP cars. The only cheap HP increase is to desnorkle, it is a proven 2+ HP.
__________________
1999 Ocean Blue Metallic Boxster - blueboxster.com
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11-07-2007, 05:59 AM
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#16
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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linkjones,
If you are having overheat problems and your car is dumping coolant you have cooling system problems... Bad t-stat, clogged radiators, bad coolant cap etc. Others have replaced their motors with a 3.4 996 without cooling problems or fuel starvation. Have someone who really knows these cars go over your cooling system.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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11-07-2007, 06:29 PM
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#17
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Registered User
Join Date: Apr 2006
Location: Chicago
Posts: 585
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Quote:
Originally Posted by RandallNeighbour
One only needs one sizeable mod to make one's ride really fast.
Trade in the boxster for a Z06.
Our cars really aren't designed for straight-line performance.
I've been salivating for a TT or a SC kit for my 2.5 for three years now, but when I drive it hard on country twisties I realize I simply do not need more power. Putzing around from light to light in town I always feel underpowered.
So I just stopped putzing around town and I'm feeling much better about my NA 2.5. It actually has tons of power for what it was designed to do.
The guys in the S's behind me on the Tail of the Dragon trip said I was every bit as quick as they were and no easier to keep up with than other boxsters with 3.2's and 3.4's in them.
I say add strut tower braces and lowering springs (and new struts if you the one you buy is over 60k mileage) and you'll be amazed at how well the car will perform around corners, where it was designed to be used.
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I can vouch that the 2.5's aren't that much slower than my 3.2 S (2002). Not only at the TOD but in addition NickCats and I spent quite a bit of time autocrossing and his last few events he was only 1.5-3 seconds behind me and I was on R compound tires versus his street tires (a lot of people say R compounds knock off 1-2 seconds from your time). Yes, I'm a bit quicker in terms of power but it isn't as dramatic as I thought it would be. IMHO the biggest difference in a "race" setting is the brakes. I'm going to get quite nervous when he buys race tread.
It also helps that he's become one heck of a driver in a short period of time.
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11-07-2007, 10:52 PM
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#18
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Registered User
Join Date: Feb 2007
Location: Australia
Posts: 217
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I Agree
I concur with the opinion of others here. On the street it could do with more power only for fun really as you can't use it seriously. I just took mine for a nice run and found some fantastic twisty roads, and I was unable to use all the power without the car getting aout of shape. So there is plenty there is you drive the car for the purpose it was originally intended.
Mine is my everyday drive car so it see's a lot of miles, but I still love getting in it even if it is just down the the shops to pick up some bread & milk.
My advice:
1. De -snorkle...if only for the sound, but I feels it adds a few horses.
2. Tyres. Well worth the expense for good ones.
3. Work on the handling although they feel more like a go cart than a car.
4. Forced induction
5. 3.4L swap.....from the new Boxy S or Caman would be great
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11-08-2007, 06:58 AM
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#19
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Registered User
Join Date: Apr 2006
Location: Chicago
Posts: 1,518
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Quote:
Originally Posted by Sammy
I can vouch that the 2.5's aren't that much slower than my 3.2 S (2002). Not only at the TOD but in addition NickCats and I spent quite a bit of time autocrossing and his last few events he was only 1.5-3 seconds behind me and I was on R compound tires versus his street tires (a lot of people say R compounds knock off 1-2 seconds from your time). Yes, I'm a bit quicker in terms of power but it isn't as dramatic as I thought it would be. IMHO the biggest difference in a "race" setting is the brakes. I'm going to get quite nervous when he buys race tread.
It also helps that he's become one heck of a driver in a short period of time.
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Thanks, Sammy. What can I say, I had a great teacher
Nick
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11-08-2007, 12:37 PM
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#20
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Registered User
Join Date: Aug 2007
Location: Calgary, AB
Posts: 13
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I don't know why everyone always assumes that when you try to get more power out of the boxster that you're trying to go fast straight. I grew up a car guy and love to tune out and add performance parts whether it's suspension, brakes and engine. These things come from the factory de-tuned to try and work in all climates, elevations and available fuel quality. If you read my post I'm planning on updating the suspension and update the cooling system (oil included) and get as much as I can out of my car.
On another note, has anyone dropped their suspension 1.5-2" and added 19" rims? I haven't done the math to see if it'll work and would like to add the Brembo 6 piston calipers with 15" rotors while dropping the suspension and adding the 19's (19's are required for the large rotors).
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Link Jones
99 Boxster, cold air intake, throttle body plenum
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