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Old 04-21-2024, 01:47 PM   #1
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2021 Interstate 24GT
Snellville , Georgia
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SPRINTER Renntech ECU Upgrade for Mercedes V30 V-6 Turbo Diesel

Has anyone had any experience, good or bad, with the Renntech ECU upgrade on the Airstream Interstate V30 Mercedes Sprinter V-6 Turbo Diesel?
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Old 04-22-2024, 09:27 AM   #2
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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
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Old 04-22-2024, 01:50 PM   #3
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There is a lot of discussion on this topic in the Sprinter-Source forum. Here is one recent example.
- - Mike
2024 Airstream Interstate 19e AWD
Previous: 2013 Airstream Interstate 3500 Ext Lounge
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Old 04-23-2024, 11:32 PM   #4
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Originally Posted by MCKlevickis View Post
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. Iíve since put about 8K on it. I think it makes a noticeable difference in mid-throttle acceleration. I havenít noticed a huge difference in mileage one way or another - even when pulling a small 14í 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 ďsurgingĒ - if youíre flogging it. Iím 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 donít flog it and so havenít been bothered by it.

All in all, Iíd say the tune is a worthwhile upgrade if youíre wanting a bit more performance out of your van. Thatís coming from someone who has done several ECU tunes on different vehicles over the past decade (when they started getting decent) and doesnít really stress about the long-term effects. As with all ECU tunes, thereís tons of opinions to be had on cost versus benefits versus Ďmanufacturer knows best so donít meddleí. Iíd do it again.

I hope that helps.
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