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Old 03-05-2021, 07:48 AM   #1
RupertPupkin

 
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Causes for choppy WOT

So I’ve had my boosted setup for a year. Only put on maybe 1000 miles. I’ve only been able to do WOT pull once in awhile. Took the car out last week, and of course I went balls out and ramped it out to 7k rpms. When I hit 5500-7000rpms, the car was kind of breaking up/puttering.

Just curious to see what could be the cause of that. AFR/ fuel pressure looked good based on a quick 1 second look.
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Old 03-05-2021, 09:26 AM   #2
sixty9fordkiller
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without knowing the setup, running out of gas or weak valve springs would be my guess

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Old 03-05-2021, 09:33 AM   #3
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Quote:
Originally Posted by RupertPupkin View Post
So I’ve had my boosted setup for a year. Only put on maybe 1000 miles. I’ve only been able to do WOT pull once in awhile. Took the car out last week, and of course I went balls out and ramped it out to 7k rpms. When I hit 5500-7000rpms, the car was kind of breaking up/puttering.

Just curious to see what could be the cause of that. AFR/ fuel pressure looked good based on a quick 1 second look.

If you have a scanner , you can run a data log and see what cylinder is. Miss firing up there . I ran into this on my truck after installing my ported heads .
Ended up being a coil pack . Easy test for the coil pack is move it from one cylinder to the other and see if that cylinder misfires if so there’s your answer..

It didn’t end there tho , I have hpt so my scanner showed me what cylinder but my injector duty cycle was at 114% at wot fuel pump was also on its way out . I was running meth at the time and so the afr wasn’t showing I was leaning out too much .. had to disconnect the meth so I could see what was really going on ..

Had to upgrade my injectors and replace my fuel pump . Retune and everything is running fine now ..

Also it could be a ground but that would show up in the scanner , like you Tb closing early at wot

Ground , spark , or fuel .. cane be tune cause you stated your car was running fine ..
could be easy as cloggged injector or bad coil pack .
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Old 03-05-2021, 10:28 AM   #4
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Logs would be great to see.


How old is the fuel? Bad coil/plug/wire?
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Old 03-05-2021, 10:38 AM   #5
RupertPupkin

 
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Originally Posted by sixty9fordkiller View Post
without knowing the setup, running out of gas or weak valve springs would be my guess

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Quote:
Originally Posted by Risingson05 View Post
If you have a scanner , you can run a data log and see what cylinder is. Miss firing up there . I ran into this on my truck after installing my ported heads .
Ended up being a coil pack . Easy test for the coil pack is move it from one cylinder to the other and see if that cylinder misfires if so there’s your answer..

It didn’t end there tho , I have hpt so my scanner showed me what cylinder but my injector duty cycle was at 114% at wot fuel pump was also on its way out . I was running meth at the time and so the afr wasn’t showing I was leaning out too much .. had to disconnect the meth so I could see what was really going on ..

Had to upgrade my injectors and replace my fuel pump . Retune and everything is running fine now ..

Also it could be a ground but that would show up in the scanner , like you Tb closing early at wot

Ground , spark , or fuel .. cane be tune cause you stated your car was running fine ..
could be easy as cloggged injector or bad coil pack .

Everything on my setup was brand new. Unfortunately I have no way of logging. I am bringing it to a new tuner this Monday, so hopefully he can figure out what’s up with all my issues.

Quote:
Originally Posted by Silver14 View Post
Logs would be great to see.


How old is the fuel? Bad coil/plug/wire?
Plugs are new. Coils are stock, and wires are new.
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Old 03-05-2021, 12:46 PM   #6
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Did the check engine light flash during the event?
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Old 03-05-2021, 01:18 PM   #7
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Quote:
Originally Posted by Tarendor View Post
Did the check engine light flash during the event?
Nope
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Old 03-05-2021, 02:29 PM   #8
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Ok what are your plugs gapped to?
If it’s set to the stock gap it will do that at wot.
Most people set the gap to .028-.030 on the plugs with a combo like yours.
I would set it to .028 for troubleshooting.
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Old 03-05-2021, 06:09 PM   #9
RupertPupkin

 
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Originally Posted by Warship2k15 View Post
Ok what are your plugs gapped to?
If it’s set to the stock gap it will do that at wot.
Most people set the gap to .028-.030 on the plugs with a combo like yours.
I would set it to .028 for troubleshooting.
I have no ideaz. Shop built it, so I would assume they gapped it correctly. They were new NGK TR7
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FIC 1200cc/DSX Aux Pump//McLeod RXT Clutch
730whp: 630Trq
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Old 03-09-2021, 09:27 AM   #10
RupertPupkin

 
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Shop called and plugs weren’t gapped incorrectly.
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CAM 22X/24X, .619/.617, 113 LSA/ LS9 Heads
FIC 1200cc/DSX Aux Pump//McLeod RXT Clutch
730whp: 630Trq

Last edited by RupertPupkin; 03-09-2021 at 09:50 AM.
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Old 03-09-2021, 09:32 AM   #11
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Interesting . So how’d that end up happening ?
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Old 03-09-2021, 09:51 AM   #12
RupertPupkin

 
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Originally Posted by Risingson05 View Post
Interesting . So how’d that end up happening ?


Gapped incorrectly...*** and 1 of the wires was also cracked/damaged.
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Old 03-09-2021, 02:34 PM   #13
joshnmn
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Wires was my input. A day late though...

Same thing happened to me. I’m relocating the coils to the frame rails to help keep the wires down away from the manifolds. (Also looks cleaner)

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