GT4 - Unlocking the Power Potential!
03-31-2016, 04:07 AM
#571
Three Wheelin'
Here is an example on track - FF to 0:56 - going into T11. Look at my throttle input, then look at RPM - the clutch is disengaged....and RPM just holds there with no throttle input. Then FF to 1:25...similar thing - no throttle input, RPMs climb/hold steady. I've talked to a friend who also has a 82mm TB setup, and we got it to do the same thing sitting in his garage...so this is real.
Originally Posted by ShakeNBake;
82mm TB on a GT4 is going to face the issue, tuned or not
03-31-2016, 09:27 AM
#572
Rennlist Member
I have some preliminary results from some work being done on my car, and my summary is that doing the plenum/TB and tune is probably not worth it right now. There are a couple issues (CEL and throttle hanging/unintended engine acceleration) that result that only seem to be addressed by the original German Tuner BGB was working with - now I'm starting to understand what MRD-SPY was belly aching about. I'm hoping our favorite tuner can fix the issues, but as of now anyone putting a 82mm TB on a GT4 is going to face the issue, tuned or not. I'm sort of poking at the system by posting this, hoping that between IPD, the vendor community, and our favorite tuner, the motivation can be found to solve it. it's odd that I'm the first to experience the issue....
Was a TB adaptation done with PIWIS at a dealer to attempt to clear the hang?
Last edited by d00d; 06-25-2021 at 07:06 AM.
03-31-2016, 09:48 AM
#573
Yes, there are actually several calibrations and adaptations that need to occur via a piwis, not just a TB (which supposedly is actually automatic). The issue is not just a cel - the cel is actually benign, it's the off throttle mapping that gets messed up.
03-31-2016, 10:13 AM
#574
Burning Brakes
I, too, am surprised to learn of this problem. I'm curious to know what it is, specifically, about this engine or ecu that is causing it.
03-31-2016, 10:21 AM
#575
I was set on doing the COBB before TB and Plenum but now I'm going to hold in case the ECU swap is the only way to get the whole package working. Wonder what COBB's and Fabspeed input on this would be as they are offering their GT450 package and a few people have done the mods.
03-31-2016, 10:37 AM
#577
03-31-2016, 12:53 PM
#579
Burning Brakes
Only if your brakes fail at the same time. The brakes on even an economy car (never mind a GT4's binders) will easily overpower an engine stuck at WOT.
03-31-2016, 01:20 PM
#580
I've asked John @ Fabspeed to chime in on this issue. I've been talking with him recently and have several of the intake parts on order with him, so I'm very interested to see what's going on.
03-31-2016, 01:47 PM
#581
Intermediate
Join Date: Mar 2016
Posts: 25
Likes: 0
Received 0 Likes
on
0 Posts
Was looking at the 450 kit myself and after reading this and watching that video OMG, think I will stay siting on the fence for now as would be very unhappy with my car doing that when it felt like it
03-31-2016, 02:43 PM
#582
Basic Sponsor
Rennlist
Site Sponsor
Rennlist
Site Sponsor
But haven't people been doing the plenum mod without a tune forever?? Waiting for fabspeed to chime in to see how their mods are working out
This makes no sense though.. This has to be a mechanical issue, like a defective throttle body.. Nothing to do with DMS or electronics..
This makes no sense though.. This has to be a mechanical issue, like a defective throttle body.. Nothing to do with DMS or electronics..
__________________
Porsche Performance Specialist
John@Fabspeed.com
215-618-9796
Fabspeed Motorsport USA
155 Commerce Drive Fort Washington, PA 19034
www.Fabspeed.com
Porsche Performance Specialist
John@Fabspeed.com
215-618-9796
Fabspeed Motorsport USA
155 Commerce Drive Fort Washington, PA 19034
www.Fabspeed.com
Last edited by John@Fabspeed; 04-05-2016 at 06:09 PM.
03-31-2016, 09:02 PM
#583
yikes this is like Toyota-gate 
04-01-2016, 05:27 AM
#584
Instructor
This is deja vu all over again and takes me back to 2013 when 9x1 tuning started.
Change fuel/air inputs with different throttle body/plenum and you need a proper tune to remap to the new conditions.
Porsche gave owners a matched set of components and tune, you mess with one element and you need to fix the other. No conspiracy, #nogate
Change fuel/air inputs with different throttle body/plenum and you need a proper tune to remap to the new conditions.
Porsche gave owners a matched set of components and tune, you mess with one element and you need to fix the other. No conspiracy, #nogate
Last edited by ralphmusic; 04-01-2016 at 06:02 AM.
04-01-2016, 08:51 AM
#585
Instructor
I'm here are reviewing all the info. This is quite unusual and not something we have experienced. Will be speaking with our tuner Steve and seeing what we can come up with. Wish we had one here in person that was having this issue...as terrible as that sounds haha
Glad to hear the Fabspeed package isn't having this issue. GT450 is the way to go guys
