I might just buy some Michelin tires with good tread hopefully that fixes the issue...

 

I suggest the same, the 17s do offer a benefit and is cost savings, tire rotation, weight savings, etc. You'll just have to put some decent tires, and align it.

 

I have done that before. Even changing from the stock Good Year Eagle RS-A to the best grand touring All Season tire will do wonders.

There are plenty of performance all season options in the 225/55/17 size. Highly recommend the Michelin Pilot AS4 - 90% of what the Michelin PS4S is with longer treadwear and slightly wider temperature range. A lot of people like the Continental equivalent but some find that the sidewall is too soft, which is definitely not preferred with the 55 size

 

Get Michelin pilot a/s 4 tires. I have them and they are transformational.

 

I'm not arguing the grip on 17 vs 18 at all, that obviously won't be a big factor.

But, with the large sidewall compared to 19s there is a lot of sidewall flex (at least in my experience) and the car was super wiggly feeling and unsettling. Don't need to be a racecar driver to feel that... I felt the same wiggly feeling on my S2000 with it's stock 16 inch wheels.

 

Add the fact that Gs are tail happy, the OP should replicate and check his sidewalls. Old trick was chalk the outer diameter of the sidewall and test it.
Any flex will disturb the chalk and show you how much flex that wall is having. Tire pressure on 55s play a huge factor, have you checked this?

 

IDK if I'd use the words "tail happy". I mean, if you're heavy on the throttle and turn TC off... sure, there's plenty of power to kick the tail out.

But if you try to dive hard into a turn and expect to kick the back end around on your way out... LOL, nope. Get ready for understeer, and panic.

Summer tires give you the grip you need, but aftermarket swaybars will balance out that understeer. You really need both, IMO.

 

I get what you mean for understeer, if you try and tackle the angle incorrectly it'll make you pucker however if you're already into a lean it does not take much to slide it. Trac will also remind you of this as it comes on.

 

All true. Every little mod helps here. Proper tires, neg camber, LW wheels and rotors, swaybars, lowering, all kinds of drivetrain & frame bracing, poly bushings everywhere...

Not sure the G is the right car to be doing all that. I mean, it is for some (me ), and you dance with the car you have more so the car you want to have.

 

I’m on my 3rd set of Michelin Pilot Sport 4S, they are not cheap but worth every penny! Hands down the best sport tire on the market. If you can afford $1500 then I’d buy a set and I’m pretty sure this issue will go away. When I first bought my coupe it had some all season tires also and I’d spin out all the time when flooring it.

 

Those tyres don't sound too promising.

And this car makes significantly more power than your Camaro. So...hit the gas pedal less, maybe?

Finesse is free.

 

Yeah but S2000's are trash, no?

 

Oh, yeah totally. that's why I got one.

 

OP,

The "Road Hugger" tires are are really the culprit here. Yes I have friends who use they on commuter specials. They are a budget tire. Not knocking anyone on a budget here. But I would first start with getting rid of those tires and putting something like a DWS 06 on. I for one hated the Michelin A/S 3 and I hate the A/S 4. The reason is Michelins seem to have no grip at all except for dedicated summer tires so something like a Pilot 4 not the A/S version may work for you. But being in Norcal I would stick to all seasons like the DWS. Yokohama's have really lost quality in the last few years plus to me they feel like a wet noodle. You could also go up to 18 inch wheels. That could help as well. But keep the stock size as increasing the width to a 235/50/17 will have a very dull feeling.

Second maybe try to buy some stock "S" model swaybars on ebay etc that should help firm up the handling quite a bit. The G37 does not corner like a WRX so be aware of the taking corners at 45 MPH mentality. This car actually has less power then your RS Camaro so losing traction is most likely once again the tires. I alternate four cars on any given week. So going from my daily driver commuter special Civic say to the G takes a little bit to get used to again. Just like I go from the G to my N65 M3. And then the wifes six speed S4 with a JB4 tune. Just all takes a bit of adjusting.

@icrap,
I find the 17's on the X adequete. The 18s are ok. But when you drive long stretches of highway you really don't want bigger wheels with lower profile tires. It really does not make for a pleasant drive. However I drive on 16s four days a week in a commuter special so it could be worse.

 

I rocked the **** out of the stock AP1s. Here's my old accord rocking all rear AP1. The front was fun to fit