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Vibration during acceleration in 1st gear

tezzasaurusrex

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Hi all,
I just took delivery of my FL5 yesterday and I've noticed a vibration coming through the cabin during acceleration in 1st gear with moderate throttle (30-50%). It seems to happen in 2 waves as it goes through the rev range and feels as though the cars got bad engine mounts. It also seems to smoothen out on the higher gears.

Would love to hear other owners input.

Thanks in advance.
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TDC50

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Took a little getting use to for me as well. Previous cars for me are an Alfa Giulia and big V8 sports cars so am use to smooth runNing engines.

This vibration is part of the Type R’s character and makes it feel full of energy at highway speeds and when accelerating. Was looking for a more unique, lightweight and playful driving experience than cars past and it’s been found in the FL5!
 
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tezzasaurusrex

tezzasaurusrex

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Unbalanced engine. All of them do it, particularly in R mode. The balanced shafts are excluded and the raucous 90s vibration is the result.
Yes actually thats exactly how it feels - like an engine with its balance shafts removed or out of phase. Its interesting that the K20 series of previous (eg, K20A, K20Z1, etc) were balance shaft free engines but ran perfectly smoothly. So the K20C1 does not run any balance shafts?
 
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tezzasaurusrex

tezzasaurusrex

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Took a little getting use to for me as well. Previous cars for me are an Alfa Giulia and big V8 sports cars so am use to smooth runNing engines.

This vibration is part of the Type R’s character and makes it feel full of energy at highway speeds and when accelerating. Was looking for a more unique, lightweight and playful driving experience than cars past and it’s been found in the FL5!
Thanks for your feedback! Much appreciated :)
 


CTR

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The vibration is reduced significantly in Comfort engine mode. I don't know if it's due to the less aggressive tune or maybe active motor mounts?
 

Rhorn

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Wait until you drive a GT350 😂
 
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tezzasaurusrex

tezzasaurusrex

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The vibration is reduced significantly in Comfort engine mode. I don't know if it's due to the less aggressive tune or maybe active motor mounts?
I see! I will try that tonight and report back
 

TDC50

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Actually the GT350 felt much smoother though I agree not as smooth as something from Merc or Audi or even the LT1 in the Corvette. I loved that engine, super linear and pulls all the way to redline. Plus it sounded amazing too 😁. Replacement cost of that engine scared me away as the 5 year powertrain warranty was about to expire.
 


TypeRD

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Interesting! Yeah, I noticed this too, but couldn’t figure out what was causing it as it doesn’t always do it…so I ignored it.🤣 It makes sense that it does it more or less based on how hard I accelerate. Also, coming from a K20Z3 for almost 14 years, I was surprised by this slight roughness. My Si was always a smooth operator. Glad it’s all good / normal for the FL5.
 
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JAMSXR

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Surely this is a good thing? Unless you want an EV… Sure, it’s not a V8 type of vibration but at least you know something is happening.
 
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tezzasaurusrex

tezzasaurusrex

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Surely this is a good thing? Unless you want an EV… Sure, it’s not a V8 type of vibration but at least you know something is happening.
I think your response is a little extreme. Personally I would have preferred the engine itself to be smoother but the car run harder durometer engine mounts instead. Type R's of old used to be blue printed engines!
 

Village911

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Unbalanced engine. All of them do it, particularly in R mode. The balanced shafts are excluded and the raucous 90s vibration is the result.
Yeah, it's because the type R engine has had balance shafts removed for weight reduction and the vibrations are an acceptable compromise XD Not a bad motor mount!!! hehe

btw I fxxking love this video here, the main reason why I bought fl5:
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