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

Reply
 
LinkBack Thread Tools Display Modes
Old 11-16-2019, 04:41 PM   #1
Registered User
 
Join Date: Oct 2019
Location: West Coast
Posts: 19
74mm 996 throttle body on a 2.5l engine?

I have a 1999 2.5L Boxster with the (68mm?) cable throttle body. We all hear about the easy gains of HP and torque a larger, 74mm plenum such as IPD can give to the 2.7 and 3.2 engines. I was wondering why IPD has never made a Y plenum for the 2.5? I 'think' it's because the 2.7 and 3.2 have the e-gas throttle vs the older, cable throttle.

So I'm wondering, has anyone ever installed a 996 c2 74mm cable throttle body onto a 2.5 and then installed the 74mm IPD plenum? Keep the stock MAF housing for the computer readings? I have NO idea if this can even be done!
(This is just a cold, Saturday afternoon's musings)

Jasper_Boxst is offline   Reply With Quote
Old 11-16-2019, 10:44 PM   #2
edc
550 Anniversary
 
edc's Avatar
 
Join Date: Jul 2012
Location: Surrey, UK
Posts: 637
Garage
Just use the plenum and throttle body from the 996 3.4 for simplicity. It bolts straight on. Make up your intake from silicone tubing.
edc is offline   Reply With Quote
Old 11-17-2019, 07:52 AM   #3
Registered User
 
Join Date: Dec 2016
Location: Clifton, NJ
Posts: 841
Dont think the 2.5 needs the bigger tb
Quadcammer is offline   Reply With Quote
Old 11-17-2019, 08:11 AM   #4
98 Arctic silver 986
 
tommy583's Avatar
 
Join Date: Jul 2011
Location: Upstate, NY
Posts: 1,277
Garage
I have the 74mm cable throttle body on my 2.5. I'm using the 2.5 plenum, it bolts right up. The 68mm throttle body is only smaller on the inside, the body itself is the same size. If you have them sitting side by side it is easy to see. Performance gains? Maybe a little at high RPM's. Maybe a little quicker throttle response. It does change the intake sound for sure. I'm still running stock exhaust, maybe with headers and high flow cats it would make a bigger difference. I paid less than a hundred bucks for it on Ebay, so for that price I think it's worth it. Would I pay $1000 to see if the IDP plenum would make it better? No.
tommy583 is offline   Reply With Quote
Old 11-17-2019, 08:34 AM   #5
Registered User
 
Join Date: Oct 2019
Location: West Coast
Posts: 19
Thanks everyone for the responses and simplifying everything!

Jasper_Boxst 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 02:43 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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