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Old 08-10-2020, 01:58 PM #1
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Any concerns of running lean with Magnuson supercharger?

I already bit the bullet and installed a Magnuson supercharger. The supercharger is a great addition to the 4runner. It gives the truck power it should’ve from the factory. Just wondering for those of you that have had yours on a dyno, is there any concern of running lean? I know Magnuson doesn’t have you upgrade the fueling system but that’s always been in the back of my mind.


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Old 08-10-2020, 02:02 PM #2
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URD runs a 7th injector to eliminate high rpm lean out. But i don't think the tuning will allow you to lean out under most circumstances?
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Old 08-10-2020, 02:40 PM #3
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I seen that from URD but I didn’t know if that would help with running a Magnuson tune or if you had to run their software with it.


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Old 08-10-2020, 04:03 PM #4
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Can't imagine running a blower without a wideband. They're relatively cheap and easy to install. Innovate, AEM, etc.
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Old 08-10-2020, 04:33 PM #5
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Quote:
Originally Posted by 08TxRunner View Post
Can't imagine running a blower without a wideband. They're relatively cheap and easy to install. Innovate, AEM, etc.

I would agree but I think most people who install the Magnuson don’t run one and I haven’t heard of any issues.....yet! Lol


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Old 08-10-2020, 04:51 PM #6
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Definitely not. Canned tunes are always rich. I had a Tacoma with the TRD supercharger (also made by Magnuson) and it would puff out black smoke at times.
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Old 08-10-2020, 04:56 PM #7
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Quote:
Originally Posted by TrailRunnin14 View Post
I would agree but I think most people who install the Magnuson don’t run one and I haven’t heard of any issues.....yet! Lol


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Why would someone spend $6K+ on a blower kit and not spend $250 to monitor and log A/F ratios? Good lord.
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Old 08-10-2020, 05:03 PM #8
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Quote:
Originally Posted by 08TxRunner View Post
Why would someone spend $6K+ on a blower kit and not spend $250 to monitor and log A/F ratios? Good lord.
Because if you install an aftermarket head unit with the Maestro module you can read them through the OBD-II connection. It may not be as good as a dedicated sensor and gauge, but enough that you have an idea.
I have the URD kit, and usually see 14.5-14.7 when cruising.
To OP, I might have a concern given the fuel pump recall that's running around. If the stock pump isn't fast enough to prevent stalling/stumbling before the blower, then it probably isn't enough for the blower. I doubt Toyota's replacement fix would be enough either.
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Old 08-10-2020, 05:12 PM #9
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Quote:
Originally Posted by 08TxRunner View Post
Why would someone spend $6K+ on a blower kit and not spend $250 to monitor and log A/F ratios? Good lord.
Most people wouldn't know what they are looking at and just want the extra power. Proof in that is the caution tag about extra noise included with the TRD kit that would be hung from the mirror when installed by the dealer. A good kit isn't going to have fueling issues and you can't really do much if there were issues. I ran just a boost gauge with mine and really that didn't do anything but it was cool to see the needle sweep around.
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Old 08-10-2020, 05:19 PM #10
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Quote:
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Because if you install an aftermarket head unit with the Maestro module you can read them through the OBD-II connection. It may not be as good as a dedicated sensor and gauge, but enough that you have an idea.
I have the URD kit, and usually see 14.5-14.7 when cruising.
To OP, I might have a concern given the fuel pump recall that's running around. If the stock pump isn't fast enough to prevent stalling/stumbling before the blower, then it probably isn't enough for the blower. I doubt Toyota's replacement fix would be enough either.
Then you really don't understand what the OEM O2 sensors are capable of reporting - which is really nothing more than a narrow band light show. And the indicated A/F ratio at cruise has no meaning whatsoever. You're throwing boost at a pedestrian engine with hypereutectic pistons and sintered iron rods (both of which are bad). Knowing A/F ratio in boost as you approach max rpm, or while under heavy load, is critical to not breaking off a ring land or worse.

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Old 08-10-2020, 07:16 PM #11
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Quote:
Originally Posted by Friggin Idiot View Post
Because if you install an aftermarket head unit with the Maestro module you can read them through the OBD-II connection. It may not be as good as a dedicated sensor and gauge, but enough that you have an idea.
I have the URD kit, and usually see 14.5-14.7 when cruising.
To OP, I might have a concern given the fuel pump recall that's running around. If the stock pump isn't fast enough to prevent stalling/stumbling before the blower, then it probably isn't enough for the blower. I doubt Toyota's replacement fix would be enough either.

It’s funny you mention that as well about the recall. I have a 2014, just installed a supercharger about 3 weeks ago. I’m going to go in and have my fuel pump replaced in the next couple of weeks. I’m just a little concerned about the new pump, hoping it performs just like OEM.


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Old 08-10-2020, 07:21 PM #12
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Originally Posted by Whippersnapper02 View Post
Definitely not. Canned tunes are always rich. I had a Tacoma with the TRD supercharger (also made by Magnuson) and it would puff out black smoke at times.

I do notice a little bit more black soot on my tailpipe.


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Old 08-10-2020, 07:34 PM #13
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I do notice a little bit more black soot on my tailpipe.


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Old 08-11-2020, 12:23 PM #14
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Then you really don't understand what the OEM O2 sensors are capable of reporting - which is really nothing more than a narrow band light show. And the indicated A/F ratio at cruise has no meaning whatsoever. You're throwing boost at a pedestrian engine with hypereutectic pistons and sintered iron rods (both of which are bad). Knowing A/F ratio in boost as you approach max rpm, or while under heavy load, is critical to not breaking off a ring land or worse.
All of this.

Under part throttle operation you're always going to be seeing something in the area of stoch, if you dont, there is a SERIOUS problem. It's under boost and high loads were an actual wideband is required. The OEM ECM should be able to maintain part throttle A/F ratios through a TON of crazy scenarios, but once you go full throttle and pull out of closed loop operation, that's where it gets involved. I'm assuming the OEM O2s are not wideband here, although a few cars do come with them.

Although, the second part of that is both knowing what the numbers mean, and how to do something about it if there needs to be something done. If you don't have ECM access to the tables to adjust power enrichment settings, you really are just watching the parade. Further more, if you dont know the parameters to the engine, in terms of intake/exhaust temps, what your A/F should be under full load, etc, etc. Then you have the potential for multiple layers of places to adjust enrichment under boost, intake temp multipliers, cat over temp multipliers, etc, etc.

I've a bit of experience in tuning supercharged engines, but those were in sports cars with a pretty large set of data to pull from before even looking at a specific car. For the vast majority of people, if the hardware and tune don't put the engine in the right state, there's just not much they will be able to do with it to fix it. If anything they might make it worse. I've seen more than a few blown engines after someone snagged HP Tuners and a laptop and figured 'those OEM noobs left 8 HP on the table by not leaning out the top end of the RPM band, let me just fix that right quick and head to the track'.
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Old 08-11-2020, 12:34 PM #15
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Quote:
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Then you really don't understand what the OEM O2 sensors are capable of reporting - which is really nothing more than a narrow band light show. And the indicated A/F ratio at cruise has no meaning whatsoever. You're throwing boost at a pedestrian engine with hypereutectic pistons and sintered iron rods (both of which are bad). Knowing A/F ratio in boost as you approach max rpm, or while under heavy load, is critical to not breaking off a ring land or worse.
someone boosts ;) This makes me think back to the highschool days and my DSM (always breaking haha)

Wideband 02 sensors are a game changer for tuning/logging/tracking info - it was huge to have when I converted to running E-85 for the higher octane eq. rating.
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