SPRINTER Renntech ECU Upgrade for Mercedes V30 V-6 Turbo Diesel

[MCKlevickis]

Has anyone had any experience, good or bad, with the Renntech ECU upgrade on the Airstream Interstate V30 Mercedes Sprinter V-6 Turbo Diesel?

[mrdes8]

Hi, while I don't have experience with the exact mod you reference, I do have extensive experience with Renntech over multiple decades of German auto work. They were the go-to company for Audi software/scanning work and have expanded to other German car lines. Nothing but positive experiences.
Good luck, Mark D

[Boxster1971]

There is a lot of discussion on this topic in the Sprinter-Source forum. Here is one recent example.
https://sprinter-source.com/forums/i.../#post-1503443

[resipsaidaho]

Originally Posted by MCKlevickis

Has anyone had any experience, good or bad, with the Renntech ECU upgrade on the Airstream Interstate V30 Mercedes Sprinter V-6 Turbo Diesel?

I installed the Renntech tune on my 2021 GL last year. I’ve since put about 8K on it. I think it makes a noticeable difference in mid-throttle acceleration. I haven’t noticed a huge difference in mileage one way or another - even when pulling a small 14’ aluminum cargo trailer (loaded with paddle boards and mountain bikes).

The biggest thing I would note is that under heavy load (climbing a long, steep grade) there is some minor “surging” - if you’re flogging it. I’m told this is a product of the type of turbo impeller MB uses on this motor and can be eliminated with a larger turbo/intake. I don’t flog it and so haven’t been bothered by it.

All in all, I’d say the tune is a worthwhile upgrade if you’re wanting a bit more performance out of your van. That’s coming from someone who has done several ECU tunes on different vehicles over the past decade (when they started getting decent) and doesn’t really stress about the long-term effects. As with all ECU tunes, there’s tons of opinions to be had on cost versus benefits versus ‘manufacturer knows best so don’t meddle’. I’d do it again.

I hope that helps.