Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster Racing Forum

Reply
 
LinkBack Thread Tools Display Modes
Old 02-27-2013, 03:00 PM   #1
Registered User
 
Speedster986's Avatar
 
Join Date: Feb 2013
Location: So. Cal
Posts: 24
How to Increase Air Intake?

I'm new to the Porsche Brand, but itching to try my next mod.

My first mod consisted of a "simple to install" bolt-on plenum that replaces the original stock plenum by Peak Aire Performance, which has yielded 36 to 37 MPG highway driving ( see pic ) & 20 to 23 MPG city.

Not sure if these MPG ratings are good or bad, however the original sticker price label when the car was sold read - 20 City 29 Highway - Comments Welcomed!

Question:

Has anyone successfully increased the size of the stock TB & Intake Plenum from 68mm to 74mm?

I would like to combine the increased performance from the first mod with a larger plenum & TB from a different Porsche model.

Does anyone have the recipe for this "DIY" cocktail?
Speedster986 is offline   Reply With Quote
Old 02-28-2013, 10:17 PM   #2
Registered User
 
Join Date: Jul 2008
Location: Austin, TX
Posts: 124
Seems to me you would get more responses in another section of the forum. Racing boxsters is more often than not done in the context of spec series which does not allow modifications to the air intake, engine or headers.
Just my 2 cents.
__________________
Michael
http://imgur.com/aiZcIk8
986FortyEight is offline   Reply With Quote
Old 03-01-2013, 05:00 AM   #3
Registered User
 
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 5,101
Quote:
Originally Posted by Speedster986 View Post
I'm new to the Porsche Brand, but itching to try my next mod.

My first mod consisted of a "simple to install" bolt-on plenum that replaces the original stock plenum by Peak Aire Performance, which has yielded 36 to 37 MPG highway driving ( see pic ) & 20 to 23 MPG city.

Not sure if these MPG ratings are good or bad, however the original sticker price label when the car was sold read - 20 City 29 Highway - Comments Welcomed!

Question:

Has anyone successfully increased the size of the stock TB & Intake Plenum from 68mm to 74mm?

I would like to combine the increased performance from the first mod with a larger plenum & TB from a different Porsche model.

Does anyone have the recipe for this "DIY" cocktail?
Before you go off spending a lot of money on modifications that may deliver only questionable results, do you homework thoroughly and be prepared to conduct the mods scientifically (e.g.: before and after dyno pulls at a reputable testing facility).

A lot of the aftermarket intake (and exhaust) mods for these cars actually add very little, if any, gains; and even then the gains are often if an RPM range where the engine spends very little of its existence. Quite often, many of these mods do something far worse: They cost a lot of money and actually reduce power and torque, and can defeat the car’s drivability at the same time.

Bigger is not always better; only when it is definitively and positively proven to increase power output in a usable RPM range, without making driving the car a pain.
__________________
Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
JFP in PA is online now   Reply With Quote
Old 03-02-2013, 02:07 PM   #4
Registered User
 
Speedster986's Avatar
 
Join Date: Feb 2013
Location: So. Cal
Posts: 24
TY on the advice!

Can you comment on my MPG ratings?

Since the plenum upgrade, the Porsche on board computer indicates substantial increase in HWY driving 37 MPG (results of 3 months of monitoring).

Please comment.... thanks!
Speedster986 is offline   Reply With Quote
Old 03-02-2013, 02:18 PM   #5
Track rat
 
Topless's Avatar
 
Join Date: Nov 2006
Location: Cucamonga CA
Posts: 3,644
Garage
Quote:
Originally Posted by Speedster986 View Post
TY on the advice!

Can you comment on my MPG ratings?

Since the plenum upgrade, the Porsche on board computer indicates substantial increase in HWY driving 37 MPG (results of 3 months of monitoring).

Please comment.... thanks!
Onboard computer is often misleading and inaccurate regarding mpg. To check your results, log your mileage, log gals used, divide miles/gal.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor
Topless is offline   Reply With Quote
Old 03-03-2013, 05:17 AM   #6
Registered User
 
Join Date: Jul 2005
Location: MA
Posts: 769
Mods to improve gas mileage? What is this nonsense? Sounds like you bought the wrong car.
__________________
98 Arena Red 986

2010 e61 535 "TTWAGON"
Stroked & Blown is offline   Reply With Quote
Old 03-03-2013, 11:18 AM   #7
Registered User
 
Speedster986's Avatar
 
Join Date: Feb 2013
Location: So. Cal
Posts: 24
S & B,

My quest for more HP & Torque is the same as most if not all Porsche enthusiast.

However, I was just sharing the pleasantly discovered bi-product of the intake upgrade with others within the Boxster community.

Trust me... where I live 91 Octane fuel averages over $4.65 per gallon (soon to be $5.00) so any inefficiency in fuel economy is an added plus in my book.

Thank you for thoughts & comments!
Speedster986 is offline   Reply With Quote
Old 03-05-2013, 08:35 AM   #8
Track rat
 
Topless's Avatar
 
Join Date: Nov 2006
Location: Cucamonga CA
Posts: 3,644
Garage
Quote:
Originally Posted by Speedster986 View Post
S & B,

My quest for more HP & Torque is the same as most if not all Porsche enthusiast.

However, I was just sharing the pleasantly discovered bi-product of the intake upgrade with others within the Boxster community.

Trust me... where I live 91 Octane fuel averages over $4.65 per gallon (soon to be $5.00) so any inefficiency in fuel economy is an added plus in my book.

Thank you for thoughts & comments!
An interesting data point:
The fastest Boxsters in SoCal running stock displacement, are also running a stock intake. This is not intuitive but it is true. Food for thought.

Watch them go at Auto Club Speedway in Fontana next month during the Festival of Speed.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor
Topless is offline   Reply With Quote
Old 03-05-2013, 08:20 PM   #9
Registered User
 
Speedster986's Avatar
 
Join Date: Feb 2013
Location: So. Cal
Posts: 24
Topless,

Thanks for all your support & insight.

See you at the Festival of Speed event!
Speedster986 is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 05:41 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page