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Old 01-24-2021, 05:16 PM   #1
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loss of power at 5800 RPMs

Hi everyone, I am experiencing a loss of power at 5800 rpms. It happens under WOT and normal acceleration. Here's a list of
mods:
Vivid Racing ECU tune
75mm throttle body and plenum.
Full Cat delete with Circuit Werks V2 muffler
Short Shift kit
aFe Air filter
if anyone has experience with the Vivid Racing tune please let me know

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Old 01-24-2021, 07:30 PM   #2
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What do you mean by loss of power? Torque is going to start dropping around 6k but there should still be plenty of oomph there. Are you noticing am inability to accelerate well or are you actually losing forward velocity past that point?

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Old 01-25-2021, 08:37 AM   #3
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It is a total loss of power almost as if I clutched in. rpms start dropping and I have no power until I lift fully off the throttle and give it some gas again.
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Old 01-25-2021, 09:35 AM   #4
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Are any dash lights coming on? Could it be that your tune is causing knocking (running too lean because of new intake) and the knock sensors are killing fuel injection and retarding timing? Lights should come on if this is the case,

If thats not it then it sounds like a fueling issue. I would start with checking the fuel pump (theres a procedure to jump the relay and measure the amount that is pumped over the course of 30 or 60 seconds, I dont remember off the top of my head). If that's not it then go through the rest of the system and check components (btw when was the last time you changed the filter?)
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Old 01-25-2021, 04:41 PM   #5
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No dash lights what so ever. I will definitely look at the fuel system. Not sure if or when the fuel filter was replaced, I have full records in New York however I'm currently in Florida.
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Old 01-25-2021, 07:14 PM   #6
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Good luck, let us know what you find

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Old 01-26-2021, 03:14 AM   #7
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Quote:
Originally Posted by Contr_eras View Post
Hi everyone, I am experiencing a loss of power at 5800 rpms. It happens under WOT and normal acceleration. Here's a list of
mods:
Vivid Racing ECU tune
75mm throttle body and plenum.
Full Cat delete with Circuit Werks V2 muffler
Short Shift kit
aFe Air filter
if anyone has experience with the Vivid Racing tune please let me know
Depending on the diag equipment you have available, would not be a bad idea to get a 5v pressure transducer from Amazon. Attach it to your fuel rail and wire it in (simple 3 wire: 5v, sig return, and ground). Hooking that up to a graphing meter or scope would easily tell you what is happening in the fuel system pressure wise at wot. Is a/c still hooked up (not sure is this is a track car or not) but if so, see what effect it has by disconnecting it. Normally should cut out at WOT. Your tune may not account for that but I donít believe that it would cause what you describe.
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Old 01-26-2021, 03:48 AM   #8
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Did the car exhibit this condition before the mods ? Were the mods done all at once or in increments ? If in increments at what point did the condition show up ?

Assuming the car is mechanically sound I would suspect the tune . Was the car tuned on a chassis dyno ?
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Old 01-26-2021, 07:40 AM   #9
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Quote:
Originally Posted by Contr_eras View Post
Hi everyone, I am experiencing a loss of power at 5800 rpms. It happens under WOT and normal acceleration. Here's a list of
mods:
Vivid Racing ECU tune
75mm throttle body and plenum.
Full Cat delete with Circuit Werks V2 muffler
Short Shift kit
aFe Air filter
if anyone has experience with the Vivid Racing tune please let me know

Lot's of fuel pumps failing these days.
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Old 02-11-2021, 06:00 PM   #10
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Hey everyone quick update, got a Durametric now plugged it in for the first time today. Haven't done any physical work on the car yet but am getting my stock throttle body and plenum shipped down to me, gonna try that before replacing any parts I don't already own. The image below is the codes that came up from the Durametric.

Here is a list of the codes as well.
P0830, Porsche Fault Code 446-Clutch Pedal Encoder (Think this is why my cruise control doesn't work)

p0638, Porsche Fault Code 402-DVE Fault Position Deviation (could this be the reason for my issues? Know BMW calls the ECU something similar to DVE. Would this narrow the issue down to throttle body or fuel pump? Can this be an issue with the tune?)

P0300, Porsche Fault Code 507- Misfire Detection (total)

P0306, Porsche Fault Code 509-Misfire Cylinder 6

P0304, Porsche Fault Code 511-Misfire Cylinder 4

P0305, Porsche Fault Code 513-Misfire Cylinder 5 (think these are all on the passenger side bank (Bank 2))

Also forgot to mention I have a vacuum leak on the drivers side of my plenum(74mm) currently being contained by Gorilla Tape. Car was misfiring like crazy and almost undriveable before the tape job now runs pretty smooth with out noticeable misfires.
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Old 02-16-2021, 06:24 PM   #11
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Misfires in 4'5'6 are your vacuum leak. You're running lean on high vacuum pull. Ya gotta fix the leak right, no duct tape! Don't drive until this is fixed, as you can cause real bad stuff to happen (comic book version lol)

The clutch code is probably the clutch connector (red colored) - it senses clutch engangagement during running and is tied into cruise control.

The 0638 may just be that your e_gas needs to be calibrated. I think there's a procedure for it in the owners manual somewhere. If not, I found this one posted somewhere in the interwebs.

Let us know how things turn out!

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