Magnuson Supercharger available $6495

Foxtrot1

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Has anyone with the Magnuson SC and at high elevation had a problem with running rich?

I purchased the SC from Livernois with their tune and when the most recent tune (3rd version) settled in I lost a lot of power and feels like hitting a wall in the power band around 4K rpm. It feels like it has less power than stock so I put it on a dyno and it’s running very rich. Also ran a smoke test after the dyno pulls and there are no leaks. See below. I hope Andy @Livernois Motorsports can help but appreciate any advice!
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ShawnC

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Yikes. Hope they can figure that out quickly.


Has anyone with the Magnuson SC and at high elevation had a problem with running rich?

I purchased the SC from Livernois with their tune and when the most recent tune (3rd version) settled in I lost a lot of power and feels like hitting a wall in the power band around 4K rpm. It feels like it has less power than stock so I put it on a dyno and it’s running very rich. Also ran a smoke test after the dyno pulls and there are no leaks. See below. I hope Andy @Livernois Motorsports can help but appreciate any advice!
1621627058544.jpeg
1621626697597.jpeg
 

moodywizard

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Did you try a different tune? From what little I know looks to be maybe a sensor input problem or when changing loop control systems.
 

Kurt0

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Has anyone with the Magnuson SC and at high elevation had a problem with running rich?

I purchased the SC from Livernois with their tune and when the most recent tune (3rd version) settled in I lost a lot of power and feels like hitting a wall in the power band around 4K rpm. It feels like it has less power than stock so I put it on a dyno and it’s running very rich. Also ran a smoke test after the dyno pulls and there are no leaks. See below. I hope Andy @Livernois Motorsports can help but appreciate any advice!
1621627058544.jpeg
1621626697597.jpeg

im confused....livernois doesnt send their own tune with the SC kit. The only way you get a livernois tune is If you drop your truck off at livernois and leave it with them for 2-4 weeks while they make it. If you ordered a kit from them, and received it through the mail, with their tune, then you’re the first one Im aware of getting that. As of just a couple months ago when i asked, that was the only way they would do the kit.

a 10:1 afr is too rich, but you arent making power. my first guesses are that your belt is slipping and you arent making boost; or your throttle plate is closing; or the SC bypass valve is opening. Youll see reduced power at elevation, but that’s not what you’re experiencing based on that chart.

What cels is it throwing? what are data logs showing for:

boost
knock correction
misfire
throttle angle request/actual
 
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Foxtrot1

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Did you try a different tune? From what little I know looks to be maybe a sensor input problem or when changing loop control systems.
I need to get some AF data to livernois and they are going to rework the tune.
 

Foxtrot1

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im confused....livernois doesnt send their own tune with the SC kit. The only way you get a livernois tune is If you drop your truck off at livernois and leave it with them for 2-4 weeks while they make it. If you ordered a kit from them, and received it through the mail, with their tune, then you’re the first one Im aware of getting that. As of just a couple months ago when i asked, that was the only way they would do the kit.

a 10:1 afr is too rich, but you arent making power. my first guesses are that your belt is slipping and you arent making boost; or your throttle plate is closing; or the SC bypass valve is opening. Youll see reduced power at elevation, but that’s not what you’re experiencing based on that chart.

What cels is it throwing? what are data logs showing for:

boost
knock correction
misfire
throttle angle request/actual
I ordered the SC kit over the phone back in October 2020 and received it via mail so who knows? It’s been on the Jeep since November and has 5k miles on it.
Im getting ~4# boost with a max of 4.22#s when the trans shifts. No knock data and the throttle shows it’s working.
 

moodywizard

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Yeah that boost and afr really weird. maybe blow off valve stuck open or remaining open for some reason. At least you get support buying from them which is great.
 

Kurt0

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Did you try a different tune? From what little I know looks to be maybe a sensor input problem or when changing loop control systems.
not likely.
I ordered the SC kit over the phone back in October 2020 and received it via mail so who knows? It’s been on the Jeep since November and has 5k miles on it.
Im getting ~4# boost with a max of 4.22#s when the trans shifts. No knock data and the throttle shows it’s working.
if the change is abrupt after you were previously getting 7-10psi, then id check connections to the bypass valve, torque specs on all the bolts, and belt tension.
 

Foxtrot1

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not likely.


if the change is abrupt after you were previously getting 7-10psi, then id check connections to the bypass valve, torque specs on all the bolts, and belt tension.
Thanks everyone for the help! Gauge Boost pressure is the same as day one since I’m at ~5,700’ elevation with 82-83kpa. Based on the data logs I consistently lose ~ 2.5#s due to baro and up to 5#s at 10,000’ when in the mountains. We did a smoke test to 7psi after the dyno and it had no leaks. I’m hoping leaning out the tune or pullying down to get more boost will solve the problem. The upstream O2 sensors support that it’s running rich. I really don’t won’t to partially uninstall the SC to replace fouled plugs but I’ll do it if needed. Waiting for the updated tune and then will update the thread.
 

Foxtrot1

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Thanks everyone for the help! Gauge Boost pressure is the same as day one since I’m at ~5,700’ elevation with 82-83kpa. Based on the data logs I consistently lose ~ 2.5#s due to baro and up to 5#s at 10,000’ when in the mountains. We did a smoke test to 7psi after the dyno and it had no leaks. I’m hoping leaning out the tune or pullying down to get more boost will solve the problem. The upstream O2 sensors support that it’s running rich. I really don’t won’t to partially uninstall the SC to replace fouled plugs but I’ll do it if needed. Waiting for the updated tune and then will update the thread.
Well, I checked both cats and they are toast, so add another one to the list.

Bank one's substrate was in so many pieces they were also pushed in to the Y-Pipe. I also removed the SC to check the plugs and coil packs. All plugs were fouled from running rich but the coil packs appear fine.

After installing all new plugs and the SC, I loaded the new tune with no success. After 4k rpm at WOT, the tune dumps too much fuel and power hits a wall. I also replaced the belt and pulley with a Z Industries pulley that has a coating to prevent belt slip. Boost now tops out at 6.9#s but the tune for the table above 4k is still way too much fuel at 5,600' in elevation.
 

Foxtrot1

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Finally got it figured out. The EGR took a s$!?. Replaced it and uploaded a prior tune and it’s running well without the WOT issues. I plan to put it on the dyno next week. So heads up to anyone running the Maggy if you start misfiring and have no power. Pull the EGR and check it. Mine had substantial carbon build up on the manifold side and minimal on the intake side. Sure as Sunday, the EGR took a dive and may have started the serious of events that caused other issues.
 

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