GOLFMK8
GOLFMK7
GOLFMK6
GOLFMKV
VW GTI MKVI Forum / VW Golf R Forum / VW Golf MKVI Forum / VW GTI Forum - Golfmk6.com



Go Back   VW GTI MKVI Forum / VW Golf R Forum / VW Golf MKVI Forum / VW GTI Forum - Golfmk6.com > Technical Topics > GTI 2.0T Engine / Drivetrain / Exhaust / Tunes


Reply
 
Thread Tools Search this Thread Display Modes
Old 03-03-2018, 01:55 AM   #1
nevekd128
FIA World Rally Car Champion
 
nevekd128's Avatar
 
Drives: sf muni
Join Date: Sep 2011
Location: SFSU
Posts: 619
f23t misfires

My f23t gets misfires only at 6k rpm and gives a sensation that it hits a rev limiter. It only happens in 3rd or 4th gear.

Im running a TT tuning catted down pipe (2.5in 400 cell). I considered trying a 3in catless downpipe, but im not sure if that would cure the issue

I recently replaced my hpfp about 500 miles ago
New plugs gapped to .026
Fresh 93 gas
R8 coil packs
__________________
MY12 gti with a f23t frankenthingy and man pedal transmission. Car rides sorta low for scene points
nevekd128 is offline   Reply With Quote
Old 03-03-2018, 02:26 AM   #2
brobst
Formula 5000 Champion
 
brobst's Avatar
 
Drives: CSG mk6 6MT
Join Date: Jan 2014
Location: Michigan
Posts: 2,341
Probably need a smaller plug gap. 0.26 may be too wide for the hp

Sent from my SM-G900V using Tapatalk
__________________
K04 P&P E30 blend | 356whp/355wtq | Beyond Superior Interior | Brobst's Build
Quote:
Originally Posted by iGTI View Post
Superior interior is like 500hp at the wheels doe
brobst is offline   Reply With Quote
Old 03-03-2018, 08:25 AM   #3
GroceryGTIer
Rally Car Newbie
 
Drives: 2013 black Wolfsburg
Join Date: Dec 2017
Location: Tri-state
Posts: 316
Got the same misfires at 5500-6k
GroceryGTIer is offline   Reply With Quote
Old 03-04-2018, 06:19 AM   #4
SkyNet
Passed Driver's Ed
 
Drives: Leon TSI
Join Date: Jan 2016
Location: Athens, Greece
Posts: 10
What’s your tune?


Sent from my iPad using Tapatalk
SkyNet is offline   Reply With Quote
Old 03-04-2018, 10:05 AM   #5
thatspsychotic
FIA GT Newbie
 
thatspsychotic's Avatar
 
Drives: '11 GTI 4DR DSG, '14 Forester XT
Join Date: Mar 2012
Location: Western MA
Posts: 725
Quote:
Originally Posted by nevekd128 View Post
My f23t gets misfires only at 6k rpm and gives a sensation that it hits a rev limiter. It only happens in 3rd or 4th gear.

Im running a TT tuning catted down pipe (2.5in 400 cell). I considered trying a 3in catless downpipe, but im not sure if that would cure the issue

I recently replaced my hpfp about 500 miles ago
New plugs gapped to .026
Fresh 93 gas
R8 coil packs
Do you have a way to take logs? The easy answers are reduce gap to 0.024", clean your MAF (can help occasional misfires but yours sounds more than occasional).

If that doesn't do it, it could be exhaust valve float. Read through this thread for more info. Going to a catless downpipe would reduce exhaust back pressure so it may actually help against valve float. But if you check the markings on your valve springs like in that thread, it may only help for a little while, since it isn't solving the actual valve spring problem.
__________________
Present: APR Stage 1+ v2.4 | APR Carbonio | R8 Coils | GFB DV+ | Unibrace UB | Tyrolsport Deadset | SuperPro Offset LCA Bushings | Enkei Raijin Gunmetal 18x8 et45 | Michelin PSS 245/35R18

Future: APR Downpipe | BFI Mounts | PTP Turbo Blanket | ST Coilovers
thatspsychotic is offline   Reply With Quote
Old 03-04-2018, 10:53 AM   #6
GroceryGTIer
Rally Car Newbie
 
Drives: 2013 black Wolfsburg
Join Date: Dec 2017
Location: Tri-state
Posts: 316
Quote:
Originally Posted by SkyNet View Post
What’s your tune?


Sent from my iPad using Tapatalk
I'm on United motorsports, but I'm suspecting an issue with the o2 sensor or maybe fuel pump since my mileage didn't improve after getting doing my carbon cleaning, and have a previous rich code. Who know though man? These are the only cars where you have to replace everything before they are reliable.
GroceryGTIer is offline   Reply With Quote
Old 03-04-2018, 01:25 PM   #7
brobst
Formula 5000 Champion
 
brobst's Avatar
 
Drives: CSG mk6 6MT
Join Date: Jan 2014
Location: Michigan
Posts: 2,341
Seeing as f23 goes above k04 levels, I would bet plug gap is too wide at 26

Sent from my SM-G900V using Tapatalk
__________________
K04 P&P E30 blend | 356whp/355wtq | Beyond Superior Interior | Brobst's Build
Quote:
Originally Posted by iGTI View Post
Superior interior is like 500hp at the wheels doe
brobst is offline   Reply With Quote
Old 03-04-2018, 03:07 PM   #8
GroceryGTIer
Rally Car Newbie
 
Drives: 2013 black Wolfsburg
Join Date: Dec 2017
Location: Tri-state
Posts: 316
Quote:
Originally Posted by brobst View Post
Seeing as f23 goes above k04 levels, I would bet plug gap is too wide at 26

Sent from my SM-G900V using Tapatalk
I was at .026 on f23 before, it did fine. Idk if OP said which plugs he used, but I used the NGK PFR7S8EG.
GroceryGTIer is offline   Reply With Quote
Old 03-04-2018, 03:21 PM   #9
brobst
Formula 5000 Champion
 
brobst's Avatar
 
Drives: CSG mk6 6MT
Join Date: Jan 2014
Location: Michigan
Posts: 2,341
Above you said you have misfires. So do you have misfires or not? I would not consider it good. Is it driveable sure, but not ideal.

Sent from my SM-G900V using Tapatalk
__________________
K04 P&P E30 blend | 356whp/355wtq | Beyond Superior Interior | Brobst's Build
Quote:
Originally Posted by iGTI View Post
Superior interior is like 500hp at the wheels doe
brobst is offline   Reply With Quote
Old 03-04-2018, 03:42 PM   #10
GroceryGTIer
Rally Car Newbie
 
Drives: 2013 black Wolfsburg
Join Date: Dec 2017
Location: Tri-state
Posts: 316
Quote:
Originally Posted by brobst View Post
Above you said you have misfires. So do you have misfires or not? I would not consider it good. Is it driveable sure, but not ideal.

Sent from my SM-G900V using Tapatalk
I am not running that plug right now... I said when I had my f23 that's what I ran, and, at that gap.

My next step will be to try that plug again since typical NGK may not be getting it done.
GroceryGTIer is offline   Reply With Quote
Old 03-04-2018, 04:20 PM   #11
nevekd128
FIA World Rally Car Champion
 
nevekd128's Avatar
 
Drives: sf muni
Join Date: Sep 2011
Location: SFSU
Posts: 619
I’m on a stratified tune and going through revisions. I will try opening up that gap a little bit and try a different exhaust. My hpfp is a new one unit as of 500 miles ago. And I’ve cleaned my primary 02 sensor and maf recently too
__________________
MY12 gti with a f23t frankenthingy and man pedal transmission. Car rides sorta low for scene points
nevekd128 is offline   Reply With Quote
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Forum Jump


All times are GMT -4. The time now is 08:18 AM.


Powered by vBulletin® Version 3.7.2
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.