Why does the stock 2017/2018 Si seem to underperform on the 0-60 & quarter mile relative to specs?

BoostedSiCoupe

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The accord may be a comfortable car to own, but its a big boat, and handles as such. It doesn't feel near as sporty as the Si.

Not saying its a bad car, but its's like a camry or a sonata-- a big boat.
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zroger73

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The accord may be a comfortable car to own, but its a big boat, and handles as such. It doesn't feel near as sporty as the Si.

Not saying its a bad car, but its's like a camry or a sonata-- a big boat.
While the Civic Si feels somewhat more sporty due in part to its weight and suspension, the Accord Sport 2.0T 6MT has the same lateral grip as the Civic Si and is faster by all metrics (except top speed, which is electronically limited to a lower value in the Accord). The Accord Sport 2.0T 10AT is considerably faster than the Civic Si. These were my hands-on observations as an Si owner who drove the Type R and Accord on a track for a couple of days earlier this week.

The Camry and Sonata are slightly more comfortable, quiet, and smooth, but the Accord feels more powerful and confident. The Accord Sport 2.0T left me impressed enough to consider trading my Si for one. The softer suspension and smaller wheels in the other Accord trims are more comfort-biased than the Sport.
 

callmehandsum

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While the Civic Si feels somewhat more sporty due in part to its weight and suspension, the Accord Sport 2.0T 6MT has the same lateral grip as the Civic Si and is faster by all metrics (except top speed, which is electronically limited to a lower value in the Accord). The Accord Sport 2.0T 10AT is considerably faster than the Civic Si. These were my hands-on observations as an Si owner who drove the Type R and Accord on a track for a couple of days earlier this week.
First all, congrats on your decision. We know the Si was giving you a bunch of bad vibes after the two incidents. Sometimes its best to start anew. Second, thanks for your contributions, they were very helpful for many of us. I believe you're making the right decision. The Accord is the superior comfort car, the Si the better driver's car. I don't think anybody would dispute that. I think I understand why the Sport appeals to you. I have a BMW 540i auto with the Sport Package. I freaking love that car. I've had it for almost 12 years now! The Accord is similar in that it has power, comfort and handles. I don't think you'll regret it because every garage should have a car like that. That said, if you could only have one car, I'm not so sure there's a right or wrong answer, only what the mind wants at that stage in time. Seems like in your current stage, comfort, power and some handles is what you want. So I wish you good luck and hope it brings joy back into driving for you.


On the lateral grip #'s and in fairness, you're comparing it with the A/S tires, not the summer tires. We can't really compare summer tire performance because the Accord Sport doesn't come with summer tires and thus has not been tested with them. I'm sure performance #'s would improve with summer tires, but adding stickier tires is not always that simple. I doubt the Accord's suspension is calibrated with summer tires in mind, unlike the Si. Can you add summer tires? Of course, but it doesn't mean it'll linearly "feel" better. One of the many things I love about the Si is that the limits are somewhat approachable, even on public roads. I never push the car hard when there's other drivers around, I don't want to endanger them, but when I'm driving on a lonely road, which is quite often, I do push it. And when I do push it, I estimate I drive at my 7-8/10ths limit and the car's 8/10ths limit. Just wanted to throw that out there, that I bought the Si to push it and I do and I have lots of fun doing it. It's its intended purpose.
 

Lcifer

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Could always do what I'm doing get the Si and the accord sport 2.0t and wait for warranties to expire swap motors and make the accord a real economy car and the Si into a FTR
 

dragonov

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According to this post: http://blog.vittuned.com/introducing-the-2017-civic-si/ and other dynos I've seen it seems that Honda slightly undersold the torque and horsepower specs on the 10th Gen SI. We're talking ~220 ft-lb of torque observed at the wheels and 205 HP at the wheels, which is better or equal than what Honda is advertising at the crankshaft.

Based on those numbers and the weight of the car I would expect to see a little bit better than the reported 0-60 times of 6.5 - 7.0 seconds and the ~ 15 second quarter mile stock.

I'm still breaking my new Si in so I haven't wanted to push it hard and time anything yet. I've cut it under 4-5k RPM at most during the break-in but I can say it has pushed me back in the seat with that torque. However, has anyone had a better run or have any insight as to why the car appears to underperform a bit vs the power it's putting out?

You can get better time by perfecting your launch. I can get 6.5 with my Honda EX
 


zroger73

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On the lateral grip #'s and in fairness, you're comparing it with the A/S tires, not the summer tires. We can't really compare summer tire performance because the Accord Sport doesn't come with summer tires and thus has not been tested with them. I'm sure performance #'s would improve with summer tires, but adding stickier tires is not always that simple. I doubt the Accord's suspension is calibrated with summer tires in mind, unlike the Si.
Fair and valid points.

I noticed that in Car and Driver's testing of the Accord Sport 2.0T (and various other models), the roadholding figure is noted as being limited by the stability control system which makes me wonder if the stock tires are capable of more grip, but the stability control proactively cuts power as you approach the vehicle's handling limits in addition to reactively cutting power when you exceed available grip. If this is the case, the vehicle may cut power at 0.87 g even with the stickiest racing slicks.
 

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Honestly, with a few K thrown at the suspension and brakes (and Ktuner), the Si makes an incredible case for itself as a track day car
 

RunningHot2017

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Has anyone done any 0-60 pulls with Full Throttle Shifting enabled? I have done a few but I have not timed them.
 

Lunarsilver17

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The two biggest inhibitors seem to be the boost lag between shifts and the CDV. Both are optimized to minimize drivetrain shock.

civic-17-mt-stock-shift-png.png
What is "BP & PB Command" on the datalog? ive never noticed those parameters on my k-tuner logs? also does the datalog show the effects of the CDV? thks
 

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What is "BP & PB Command" on the datalog? ive never noticed those parameters on my k-tuner logs? also does the datalog show the effects of the CDV? thks
Boost lag between shifts is the biggest thing I’ve noticed. Especially, if you don’t turn the vsa off. Spin into 2nd and the vsa will instantly kill acceleration. It’s almost dangerous imo. Seems Honda took a lot of care to minimize how hard you can be on the drivetrain. I’m interested to see the next gen Si and if they keep it dumbed down or the give it some of its edge back like the ones of the past.
 


zroger73

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Seems Honda took a lot of care to minimize how hard you can be on the drivetrain. I’m interested to see the next gen Si and if they keep it dumbed down or the give it some of its edge back like the ones of the past.
As the general driving population becomes dumber, manufacturers seek to reduce warranty claims, and lawyers become even more greedy, manufacturers will continue to implement safety devices to protect their interests.

I'm truly astounded that vehicles sold in the US for use on public roads aren't limited to 85 MPH by now - the maximum legal speed limit. Even a Nissan Versa is capable of a drag-limited 110 MPH while the least-expensive Honda Civic hatchback is electronically limited to 131 MPH. Neither of those vehicles are equipped with brakes or safety equipment suitable for the speeds they are capable of reaching.
 

charleswrivers

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VSA was just as bad on the 9th gens... you just had less power to cause wheel spin and a slightly heavier car. I'd not want to go back to a less powerful car to have less wheel spin. Even with a NA 2.4L engine with the same 205 flywheel horsepower claim... I didn't find it very impressive. It only put out about 165-170 at the wheels... at that was at the very top of it's RPM range. We make twice again or more the torque down low as a K24Z7 when that turbo is spooled.
 

kerrmoney

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Have you no lift shifted without reflash
Optimal shifting point... When driving mine I cruise at 3-3200K no mater what gear I am in.

As far as shifting goes.

NO LIFT SHIFT! bang those gear ;)[/QUOTE

Have you no lift shifted without any issues on 100% stock Si?
 

MattyNice

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VSA was just as bad on the 9th gens... you just had less power to cause wheel spin and a slightly heavier car. I'd not want to go back to a less powerful car to have less wheel spin. Even with a NA 2.4L engine with the same 205 flywheel horsepower claim... I didn't find it very impressive. It only put out about 165-170 at the wheels... at that was at the very top of it's RPM range. We make twice again or more the torque down low as a K24Z7 when that turbo is spooled.
That may be true but you could shift as fast as your ability and it would run the second back in gear. This car likes to say, not so hard where as the past ones said, is that all you got. (Had a 09 and 12 si). The 09 was the last of the Honda’s of yesterday imo. That car was raw. But don’t get me wrong, I love this car...I mean, love it...and wouldn’t go back to the prior ones...it’s so nice to have power down low where most people spend their time on the daily commute etc...

And imo, you can’t compare a family sedan to the Si...well, in coupe form...the accord is WAY bigger and most likely not cross shopped against the si. There’s also about a 6k price difference. I’ll take the smaller and lighter car anyday over the bigger and heavier one. Even if their performance is similar...and if I’m going up to 30k and looking for something like an Si, I’m still not buying the accord. 2 different classes of cars.
 
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charleswrivers

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That may be true but you could shift as fast as your ability and it would run the second back in gear. This car likes to say, not so hard where as the past ones said, is that all you got. (Had a 09 and 12 si). The 09 was the last of the Honda’s of yesterday imo. That car was raw. But don’t get me wrong, I love this car...I mean, love it...and wouldn’t go back to the prior ones...it’s so nice to have power down low where most people spend their time on the daily commute etc...
Between the 'good old days' of the old ~8k RPM K20 or the ~7k RPM K24... both with well less power than this car stock and certainly the 9th gens with its own problems with it's stock tune... horrific rev hang and oddly hesitant now and then, even with good traction running 93 octane... I'm pretty pleased. I drove the 10th gen Si then still kept my 9th gen to sleep on it for a few days... the had to keep it a week longer to wait for my car to be delivered. While I'll agree the last 500-1000 RPM in the 10th gen isn't much to write home about... the quick enable and adjustments made what lag that exists pretty minimal. Given all the old turbo cars I've fooled with over the years, it isn't the least laggy I've ever experienced, save maybe one of those inline 6 Bimmers... and the one I drove was a long time ago. I bet they're even better now.

People running ethanol and a reflash are making near 90s LS1 levels of power out of an engine with a little more than 1/4 the displacement. I wouldn't have believed it was possible at that time.
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