Bosch LSU 4.2 vs 4.9

Support for EMU BLACK device
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Joined: Sun Feb 03, 2019 1:13 am

Bosch LSU 4.2 vs 4.9

Post by jcormier » Sun Feb 03, 2019 1:30 am

Hi guys,

I am looking at getting a black for my Toyota jzx100 1jz vvti,

I talked to a tuner/dealer in my area he was quite
knowledgable, only thing that he told me that i would like a second opinion on was that in his opinion the 4.2 sensor is more reliable than the 4.9 due to the controller on the black.
Is there any truth to this?

Posts: 14
Joined: Tue Nov 13, 2018 4:32 pm

Re: Bosch LSU 4.2 vs 4.9

Post by BillyC » Mon Feb 04, 2019 5:51 pm

I've had both setup on different projects and the 4.9 has been more reliable for me. This was using an AEM controller for both the 4.2 and 4.9. I started switching all of my projects over to the 4.9. I'm only using the 4.9 now on the EMU Black and I have about 1500 street miles on the setup so it hasn't proven it's self yet. Of course if you trust your tuner I would go with whatever they suggest. Either one will probably work fine. Any reason why the EMU controller specifically could cause issues with the 4.9? I'm just curious.

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