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Forced Induction Turbo, Supercharger, Methanol, Nitrous


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Old 12-03-2017, 11:54 PM   #15
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I'm having similar issues, but its moreso when I'm on higher ethanol content, cruising on low rpms. Weird part is that the issue comes and goes but doesn't happen on 91.. its got a mind of its own
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Old 12-05-2017, 06:16 PM   #16
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Originally Posted by Amputechture View Post
Perhaps I'm misreading your post...but you are supercharged on the stock map sensor? The standard JRSC pulley makes more boost than the OEM sensor's range.
That's not an issue. You don't need a larger range sensor than OEM, it just caps the pressure reading.
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I'm having similar issues, but its moreso when I'm on higher ethanol content, cruising on low rpms. Weird part is that the issue comes and goes but doesn't happen on 91.. its got a mind of its own
Can you log the car? Where is the FF connected to (Rear O2 or CPC)? If the O2 sensor port I'd check the AF#3 correction values in the log.
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Old 12-05-2017, 08:16 PM   #17
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That's not an issue. You don't need a larger range sensor than OEM, it just caps the pressure reading.

Can you log the car? Where is the FF connected to (Rear O2 or CPC)? If the O2 sensor port I'd check the AF#3 correction values in the log.
Huh? How would the ECU not being able to determine the correct manifold pressure not be an issue?

I suppose on a supercharged car where boost should always (assuming everything is working fine from a mechanical perspective) be the same amount it would be less of an issue...but I would still be weary.
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Old 12-05-2017, 09:30 PM   #18
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I have the PTuning FF kit.
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Old 12-06-2017, 03:45 PM   #19
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Originally Posted by Amputechture View Post
Huh? How would the ECU not being able to determine the correct manifold pressure not be an issue?

I suppose on a supercharged car where boost should always (assuming everything is working fine from a mechanical perspective) be the same amount it would be less of an issue...but I would still be weary.
Every single Sprintex SC car runs the OEM sensor as having a correctly reading MAP sensor causes fueling issues, I have one which I tune. All it means is that I don't get over 1.36 Bar on the OBD reading, as the fueling is done primarily via MAF then it runs consistently and I don't really need to know the manifold pressure. I expect it's the same pressure as when I had it dyno'd years ago Unless you max out the MAF and need to run SD then it's a complete non-issue. I also suspect that running a lower range MAP sensor would cure the odd fueling that affects the Cosworth SC kits too when in boost.
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Old 12-06-2017, 03:55 PM   #20
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Quote:
Originally Posted by Kodename47 View Post
Every single Sprintex SC car runs the OEM sensor as having a correctly reading MAP sensor causes fueling issues, I have one which I tune. All it means is that I don't get over 1.36 Bar on the OBD reading, as the fueling is done primarily via MAF then it runs consistently and I don't really need to know the manifold pressure. I expect it's the same pressure as when I had it dyno'd years ago Unless you max out the MAF and need to run SD then it's a complete non-issue. I also suspect that running a lower range MAP sensor would cure the odd fueling that affects the Cosworth SC kits too when in boost.

That makes sense. I'm from the turbo world, I've maxed out every MAF I've ever had and had to run hybrid MAF/MAP setups.
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Old 12-24-2017, 03:11 PM   #21
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Update:
Changing the spark plugs alleviated some of the issue. The plug gap was worn out. It would hesitate at anything above 50% throttle. Now I'm having the issue at the higher RPM range, always at 6.5k rpm, the car hesitates and wont go. I've cleaned the MAF sensor which I haven't cleaned ever (lol) and got the same results. I have a vid below.

[ame="https://www.youtube.com/watch?v=482kHy7oUJo"]Boost issue 1 - YouTube[/ame]

[ame="https://www.youtube.com/watch?v=sQJkR8Cv5T0"]Boost issue 2 - YouTube[/ame]

The 2nd vid hesitates at 6k which it doesn't do often. My tuner said it wasn't the MAP sensor. I haven't swapped to test as yet though.

So the list of possible issues:
MAP sensor
O2 Sensor
Vac Leak?
Coil Packs?
What other possibility?
Other note is my engine has 150k miles on it. The issue did start until 145k miles.
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Old 12-24-2017, 03:35 PM   #22
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Does your tune include FFS? I have an OFT (NA) but I set FFS RPM too low and I got weird high RPM shifting issues. Just a thought.
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Old 12-24-2017, 04:52 PM   #23
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Quote:
Originally Posted by Cal3000 View Post
Update:
Changing the spark plugs alleviated some of the issue. The plug gap was worn out. It would hesitate at anything above 50% throttle. Now I'm having the issue at the higher RPM range, always at 6.5k rpm, the car hesitates and wont go. I've cleaned the MAF sensor which I haven't cleaned ever (lol) and got the same results. I have a vid below.





The 2nd vid hesitates at 6k which it doesn't do often. My tuner said it wasn't the MAP sensor. I haven't swapped to test as yet though.

So the list of possible issues:
MAP sensor
O2 Sensor
Vac Leak?
Coil Packs?
What other possibility?
Other note is my engine has 150k miles on it. The issue did start until 145k miles.
Fuel filter/pump? I mentioned this before. No one commented unless I missed it.

Edit: My dad’s GMC 2500 cut out power and went to limp mode. I sounded like the turbo was bypassed. The truck would not go faster than 45mph or rev as high. He changed a clogged filter, and it immediately fixed the issue.

I think you have to ask yourself what could have changed? Bad fuel, low fuel pressure, bad afr, bad spark or bad compression. Bad afr could be a header leak, a clogged cat, a boost leak, a bad o2 sensor or something but I can’t imagine you would see any of these problems with no CEL.
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Old 02-05-2018, 10:38 PM   #24
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Fuel filter/pump? I mentioned this before. No one commented unless I missed it.

Edit: My dad’s GMC 2500 cut out power and went to limp mode. I sounded like the turbo was bypassed. The truck would not go faster than 45mph or rev as high. He changed a clogged filter, and it immediately fixed the issue.

I think you have to ask yourself what could have changed? Bad fuel, low fuel pressure, bad afr, bad spark or bad compression. Bad afr could be a header leak, a clogged cat, a boost leak, a bad o2 sensor or something but I can’t imagine you would see any of these problems with no CEL.
I noticed that the Atmosphere pressure is reading low which could be a contributing cause, but there is no CEL. I started another thread regarding the location of it.
I'm not sure if I have a clogged filter. The car runs a lot worse on pump gas than E85 which tells me it's probably a fuel compensation issue. :/
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Old 03-02-2018, 11:02 PM   #25
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Update. It was just cylinder 1 coil pack that went bad. Nothing major. Car is running fine again. Thanks for all the help all.
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