Anyone knows where I can find the gear ratios of the 8-speed DCT of Emira i4?
I'm about to do a "probably" first-ever i4 dyno test.
I'm about to do a "probably" first-ever i4 dyno test.
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Emira 2.0 DCT gear ratio
- Thread starter HankRS225
- Start date
- Thread starter
- #3
Do you have the final gear ratio, too? Thanks!
[first-ever i4 dyno test.]. You probably are!
We should take bets on power output. With Car&Driver clocking a 3.4s to 60mph run I'm thinking 415 HP
Some of the Dyno facilities also have scales, would be nice to know the actual weight as well.
[0-60 calculator ] this is my swag - Curb weight with feather weight driver
Subtract 0.2 sec for rollout => 3.4s to 60 mph
enjoy
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centerpunch
Emira Fan
Certainly has the Mercedes stock gearing, right?
Took another look and couldn't find anything, sounds like you'll have to figure it out based on dyno rpm.
- Thread starter
- #9
If the above numbers are correct, then 5th gear might be the one closest to 1:1 for dyno test?
A good source of info can be obtained from
Typical of the info are, engine hp and torque curves, vehicle weight, acceleration figures, gearbox ratios, mph/rpm, kph/rpm curves,
Here is the link detailing the g/box ratios,
Engine power curves can be obtained from,
I hope this helps.
Looking forward to seeing if your dyno curves match.
John
- Thread starter
- #11
thanks for the info, looks like 5th gear is the one to run dyno.
- Thread starter
- #12
[first-ever i4 dyno test.]. You probably are!
We should take bets on power output. With Car&Driver clocking a 3.4s to 60mph run I'm thinking 415 HP
Some of the Dyno facilities also have scales, would be nice to know the actual weight as well.
[0-60 calculator ] this is my swag - Curb weight with feather weight driver
View attachment 57058
Subtract 0.2 sec for rollout => 3.4s to 60 mph
enjoy
I think you meant 4.3s rather than 3.4s...?
See this post, thanks
Jan 2025 Car & Driver * Emira AMG * one-pager
Just received my Jan C&D digital issue. Below is the full page article for your collection ;) (same as what Toon posted from his phone Screen shots)
www.emiraforum.com
- Thread starter
- #15
damn, 400hp + DCT got 3.4s to 60mph? that's insane.See this post, thanks
Jan 2025 Car & Driver * Emira AMG * one-pager
Just received my Jan C&D digital issue. Below is the full page article for your collection ;) (same as what Toon posted from his phone Screen shots)
yes, quick. Suspect the 400HP variants have a bit more than 400 HP maybe 415 Hp. The US spec also has the latest DCT software.
C&D testers probably tested on a sticky surface in cool temperatures and subtracted roll-out time. From testing perspective you can really on compare cars using the same methodology ie C&D to C&D not R&T to C&D.
C&D testers probably tested on a sticky surface in cool temperatures and subtracted roll-out time. From testing perspective you can really on compare cars using the same methodology ie C&D to C&D not R&T to C&D.
- Thread starter
- #17
Excellent, very nice curves ! It does appear the engine is underrated. Parasitic drivetrain loss is always difficult to project. With a DTC, no drive shaft u joints, the loss ratio might be 10-15%. maybe on the lower side. Still putting the output well over 360 HP -- perhaps ~375HP.
Torque curve is amazing. Thanks for posting !
Torque curve is amazing. Thanks for posting !
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