04-14-2021, 10:57 AM
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#1
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Registered User
Join Date: Nov 2016
Location: NJ
Posts: 22
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2.5 Boxster Tune/ header Improvements or Dyno numbers?
Does anyone have 2.5 Boxster Tune/ header Improvements or Dyno numbers?
FOr classing have to stick with the @.5 and seeing how I can pull a little more power out of it
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04-16-2021, 06:39 PM
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#2
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Registered User
Join Date: Apr 2016
Location: SE Michigan
Posts: 497
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Underdrive pulley and 74mm throttle body from 1999 996 will get you a bit more noticeable gain, less belt noise and more intake noise too, what I did on mine.
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1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow!
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04-26-2021, 12:38 PM
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#3
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Registered User
Join Date: Aug 2005
Location: Sanford NC
Posts: 2,537
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Since you want it to be legal in its class, ask the racers in that class. By all means AOS, deep sump with baffles, suspension updates before worrying about power. You want reliability and handling first for your safety. Once your ability has been tested to the max, then worry about power/speed.
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04-27-2021, 07:15 PM
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#4
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Registered User
Join Date: Oct 2020
Location: KY
Posts: 1,216
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Quote:
Originally Posted by Boxstard
Underdrive pulley and 74mm throttle body from 1999 996 will get you a bit more noticeable gain, less belt noise and more intake noise too, what I did on mine.
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When you went up to a 74mm TB, was the dme able to compensate or did you need a 996 flash?
Sent from my POCOPHONE F1 using Tapatalk
__________________
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...
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05-02-2021, 08:17 PM
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#5
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Registered User
Join Date: Apr 2016
Location: SE Michigan
Posts: 497
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Quote:
Originally Posted by ike84
When you went up to a 74mm TB, was the dme able to compensate or did you need a 996 flash?
Sent from my POCOPHONE F1 using Tapatalk
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Plug and play, no messing around with DME. Runs great!
__________________
1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow!
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05-04-2021, 08:40 AM
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#6
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Registered User
Join Date: Oct 2020
Location: KY
Posts: 1,216
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Quote:
Originally Posted by Boxstard
Plug and play, no messing around with DME. Runs great!
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That's really interesting. When I went up to 82mm the dme could not adjust, not even close.
Sent from my POCOPHONE F1 using Tapatalk
__________________
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...
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05-04-2021, 04:48 PM
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#7
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Registered User
Join Date: Apr 2016
Location: SE Michigan
Posts: 497
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Quote:
Originally Posted by ike84
That's really interesting. When I went up to 82mm the dme could not adjust, not even close.
Sent from my POCOPHONE F1 using Tapatalk
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Maybe because your car had e-throttle, not cable-throttle as mine?
__________________
1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow!
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05-05-2021, 07:39 AM
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#8
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Registered User
Join Date: May 2018
Location: Michigan
Posts: 104
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Did you have to go to the IPD plenum with a 74mm? Could one just swap the OEM 996 plenum and 74mm in the 986?
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05-05-2021, 08:23 AM
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#9
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Registered User
Join Date: Oct 2020
Location: KY
Posts: 1,216
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Quote:
Originally Posted by Boxstard
Maybe because your car had e-throttle, not cable-throttle as mine?
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That's an interesting point, it's certainly possible. I think though there is probably just an upper limit (like with fuel trims) as to how much they can adjust and my guess is it's somewhere between the capacity of a 74 and 82 mm TB.
Sent from my POCOPHONE F1 using Tapatalk
__________________
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...
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05-05-2021, 08:34 AM
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#10
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by 2ata
Did you have to go to the IPD plenum with a 74mm? Could one just swap the OEM 996 plenum and 74mm in the 986?
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That's what I did on mine, I have another set i'll sell .
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OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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05-05-2021, 08:48 AM
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#11
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Registered User
Join Date: Oct 2020
Location: KY
Posts: 1,216
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Quote:
Originally Posted by BYprodriver
That's what I did on mine, I have another set i'll sell .
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The 996 should fit a 74 no problem. There are different style plenums for the 996 though (cable vs ethrottle) and you may need to do a bit of work to make them match up. I did this on my build (ethrottle tb cable plenum)
Sent from my POCOPHONE F1 using Tapatalk
__________________
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...
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05-05-2021, 08:52 AM
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#12
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Registered User
Join Date: May 2018
Location: Michigan
Posts: 104
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Quote:
Originally Posted by ike84
The 996 should fit a 74 no problem. There are different style plenums for the 996 though (cable vs ethrottle) and you may need to do a bit of work to make them match up. I did this on my build (ethrottle tb cable plenum)
Sent from my POCOPHONE F1 using Tapatalk
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I just put the IPD and 82mm on the 996 so I have the factory plenum and 74 just sitting here.
They're off an '02 would be going to my '01 986
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05-09-2021, 05:16 PM
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#13
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Registered User
Join Date: Apr 2016
Location: SE Michigan
Posts: 497
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Quote:
Originally Posted by ike84
That's an interesting point, it's certainly possible. I think though there is probably just an upper limit (like with fuel trims) as to how much they can adjust and my guess is it's somewhere between the capacity of a 74 and 82 mm TB.
Sent from my POCOPHONE F1 using Tapatalk
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I thought the tube ID at MAF is 74mm so it’s the bottleneck if you use a bigger TB.
__________________
1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow!
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05-09-2021, 05:32 PM
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#14
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Registered User
Join Date: Oct 2020
Location: KY
Posts: 1,216
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Quote:
Originally Posted by Boxstard
I thought the tube ID at MAF is 74mm so it’s the bottleneck if you use a bigger TB.
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You are correct. I completely forgot about it until you mentioned it but I also went up to a larger maf housing size, 3.25 or 3.5 inches (Don't remember off the top of my head but I think it was the TB for a 4.4l bmw v8) when I redid my intake. In retrospect, the dme's problem was probably moreso that than the 82mm TB.
Sent from my POCOPHONE F1 using Tapatalk
__________________
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...
Last edited by ike84; 05-09-2021 at 05:35 PM.
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