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[jequiz]

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[chopsuey34]

100-120 mph or 100-120 kmh? Are you driving on the streets or on the track that fast?

 

[DYI01]

A good set of high performance summer tires is likely your best bet.

 

[TypeRD]

Yeah, it makes sense that lowering the car should help aero.

 

[VegasSi]

I don't know if its the stock tires on my Si or just the way the Si is in general, but at highway speeds 70-80 I get vibrations in my steering wheel. Not a lot but enough to feel it and see it, especially when tires are cold. I could pull my hands back and see the steering wheel slightly moving.

 

[cryptolime]

get a wing for that downforce and summer tires

 

[cryptolime]

I don't know if its the stock tires on my Si or just the way the Si is in general, but at highway speeds 70-80 I get vibrations in my steering wheel. Not a lot but enough to feel it and see it, especially when tires are cold. I could pull my hands back and see the steering wheel slightly moving.

same here. it's a bit buzzy. it's gotten a tiny bit better with some more miles on them.

 

[VegasSi]

same here. it's a bit buzzy. it's gotten a tiny bit better with some more miles on them.

How many miles are on yours? I got 1,100 on mine

 

[cryptolime]

How many miles are on yours? I got 1,100 on mine

1700 miles. i think the combination of low profile alloy wheels, minimal sound insulation, and UHP tires is just noisy. especially on older roads. they do perform very well in every other aspect though.

 

[Stryxx]

mph, highway midnight. but would a set of lower springs improve the stability at such speed u reckon?

There are a number of things you can do to improve your stability at higher speeds. Coils that lower your car will improve your stability because you'll have a lower center of gravity. I recommend installing springs, the Sport has adjusting shocks similar to the Type R (Sport mode) which change driving characteristics, and its not only cheaper to do springs but less of an issue dealing with the shock sensors than if you replace with a full coil kit. With springs, you'll still get about 1" or more lower, which will help with your goal. I'm looking at Eibach's Pro kit for my Sport which should drop me about 1.1" all around.

I would also recommend upgrading things like; Your rear sway bar and end links, front end links (Possibly the sway bar as well, haven't done this myself yet), and an easier to do add-on would be a front tower support which will stiffen up your front end. These things will add more rigidity to your suspension, keeping your car more level on the road, and the upgraded end links can handle the stress of a stiffer sway bar and will be less likely to fail (Stock end links on stiffer sway bars can fail because of the tolerances they were designed for).

Replace your tires, the Eagle Sports suck for all season, and depending on where you live better performance tires will make a big difference. I'm in Washington, so rain is an issue, and the Continental Extreme Contact DSW06 was my pick. I also went from the stock 235/35R18 to a 245/35R18 (10mm wider tire and slightly taller). For warmer locations you can go with a summer tire. Keep in mind, tires are only part of the solution, and you'll have to upgrade your suspension as well.

I'd also consider better brake pads if you're going those speeds often, as braking from those speeds will wear the factory ones out sooner, and a more spirited focus set of pads would benefit you more.

I went ahead and added the factory wing, which installs into the hatch frame of my car, and that does help the back end quite a bit. If you have issues with your car lifting or it feeling "Floaty", look into proper aero, not the cheap stuff you can find on amazon and ebay. You want stuff that will properly keep your car firmly planted on the road at higher speeds, and self tapped screwed on wings can't do that, nor can taped on front lips and side skirts. I honestly wouldn't worry about this until you've upgraded everything else and are more familiar with what you need.

Keep in mind, if you have no track experience, and you're into just spirited driving - I would take a track day and learn about your car from a professional, as well as how to handle your car at higher speeds. Not sure what you have in your area but its worth the couple hundred per session to get some track time. Most car clubs will get a club discount for entire track days, best way I've found to spend as little as possible, while still getting the knowledge and hands on time to learn more about your car. This way, when you're driving at those higher speeds, you're more likely to keep yourself and others safe.

So far, I've done all but springs and the front sway bar, and I handle pretty well up to 140mph. That being said, I can't prevent wind, road conditions, or other external influences from reducing my stability so be prepared for anything. I also don't recommend going those speeds unless you've had some track experience, have made the necessary improvements to your car, as Honda didn't intend the Sport to be hitting its chipped speeds outside of the track.

 

[Stryxx]

I don't know if its the stock tires on my Si or just the way the Si is in general, but at highway speeds 70-80 I get vibrations in my steering wheel. Not a lot but enough to feel it and see it, especially when tires are cold. I could pull my hands back and see the steering wheel slightly moving.

Tires and road conditions will effect this the most. There is also now an open recall on the steering components to most Civic models. Upgrade your tires, maybe toss on some suspension upgrades, and you should see some improvement to the vibrations. You can also add some sound deadening to your doors, the drivers side panel (Lower dash, left side of steering wheel) as this created a lot of vibrations for me. I went all out on my sound deadening but those were the trouble areas for me when driving.

 

[Stryxx]

ty bro, I had a look at the springs earlier and apparently u need their rear camber kit for proper alignment as they stated on the website. I’m not really sure why that’s needed but r u planning to get urself one of the camber kits as well?

No. From my understanding the camber from the springs is 2% or less which is negligible. If it changed toe, I'd be more inclined, but a slight camber won't hurt. You will need to rotate your tires more because of wear but that's about it. If you want adjustable camber then I'd get the kit.

I already rotate my tires every 6k miles when I do my oil changes so this isn't a problem for me. If you do get the camber kit you'll need an alignment too.

 

[madbikes]

I would start by getting an alignment readout instead of getting things that helps with stability. Some cars may be more aerodynamically sensitive with crosswinds than the others.

 

[cryptolime]

i would start with high performance summer tires and an alignment. I'd increase toe-in a bit to maximum spec.

 

[Stryxx]

i would start with high performance summer tires and an alignment. I'd increase toe-in a bit to maximum spec.

Honestly wouldn't touch toe or camber unless they're not aligned (You've been in a wreck, hit a pothole hard, upgraded camber kit or toe arm, etc...). Even an alignment would be a bit much until you throw on a camber kit and toe arms for better adjustment as it's more of a daily that goes fast, not a track car. I do agree with new tires but take into account local weather and temperatures. Summer tires most days would end up in the ditch in Washington for example but a performance wet weather keeps you planted.

Honestly plan on getting a set of tires and rims for just track days myself and running my continentals for daily.

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