What are the best suspension mods for the 370 for DD and some track use?

ChrisSlicks

2-piece rotors might give you a "slight" acceleration boost, I didn't notice anything striking. Only my front rotors are significantly lighter, the rears are within a pound or two as they have iron hats.

A while back Grassroots Motorsports did a laptime test using different weight wheels, the times were all extremely close. In fact they noted a higher top speed with the heavier wheels (the rotating weight acts like a flywheel does).

Forget lightweight 1-piece rotors, those are not suitable for tracking. You are just reducing mass that can absorb the thermal energy from braking.

The real question you have to ask yourself before buying 2-piece rotors is how much is it going to cost in the long run? I have to replace my rotor rings after every 12-14 track days. Theoretically new rings should run about the same as new 1-piece rotors but you are at the mercy of the vendor. Make sure you find out the replacement cost before buying - usually new mounting hardware is required every time as well (hat to ring screws, nuts and washers). For me the cost is an acceptable trade off, but do your homework first.

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

XwChriswX

Thanks for the info... So say which do you think would be a better introductory set of rotors for someone who probably won't have that many events per year...

FS: DBA 5000s 2 Piece

Or

BNIB Racing Brake 2 Piece Front Rotors

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Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14

ChrisSlicks

Between DBA's and no names, that is a no brainer. DBA for sure. Good steal and design is as important as anything and DBA has it. DBA also stands behind their product 100%.

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XwChriswX

Racing Brake is a no name brand??

Ok, then if one were to stay DBA, would you recommend the one piece 4000 or the two piece 5000, those two pieces are FS with very light use, or a brand new set... The 4000's are single piece, but half the price... so in the end you could get all 4 4000's for the price of the front 5000's...

This is for DD and good canyon runs + eventual track days. When it comes time for serious tracking, I could always upgrade right?


And if one were to just get the fronts with stock rears, would that hamper the braking system? Or is it recommended to just swap all 4 out at the same time?

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Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14

ChrisSlicks

Sorry I though they were using the term generically, didn't see the RB logo.

In your case I would go with DBA 4000's as a replacement rotor. There is no point doing a 2-piece rotor now if the track is still a long way away. They would perform admirably on the track anyway.

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

XwChriswX

Alright, so 4000's would be the best... even better than the RB ones?

I know there is some towards having cross-drilled and slotted rotors vs just slotted. For the DD/Spirited Canyon runs/Maybe a few track days later on, would this present a real problem, or would it just be better to get slotted only?

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Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14

ChrisSlicks

RB only makes a 1-piece rotor for the base model, they don't have one that fits the sport package, only the 2-piece you referenced. The RB 2-piece would be fine as well, both companies have good metallurgy and construction.

The drilled rotors look sexy, but when the cracks start playing "connect the dots" after a couple of track days you'll be hating it. They're fine for street driving but add additional noise and help consume your brake pads faster.

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Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms