The G37S is a great track car
#301
Finally got a chance this weekend to finish installing the rear differential bushings, Z1 expanded capacity diff cover with cooling fins, and flush the diff with some better Redline fluid.
I also picked up some exhaust wrap to use close to the differential to help keep some more heat away from the ABS sensors. Hopefully, all of this will keep my ABS sensors from melting at the next track day. Fingers crossed...
I also picked up some exhaust wrap to use close to the differential to help keep some more heat away from the ABS sensors. Hopefully, all of this will keep my ABS sensors from melting at the next track day. Fingers crossed...
#302
Registered Member
Will upload a video shortly. I am quite happy with the current setup, it's little oversteery but plenty of fun. I am still learning how to correct oversteer properly, which is hard with my current setup. I have Hotchkis rear sways at the middle setting (3 way) and front Eibach sway bars at the lower (2 way) setting. I am getting lots of lift off oversteer which I think it unusual given the slight bias of weight to the front and the multilink suspension setup. I may move the Eibach fronts to the higher setting and see if it fixes that issue.
My suspension tuning is probably different than yours, but I have a Hotchkis sway in the front only. Despite how counter intuitive that sounds, it works for me haha.
#303
Registered User
4DR, let me know how the car feels after the fresh diff fluid. I am thinking of changing mine soon given how I've been beating on the car lately.
bP, that is definitely a unique set up. I did the same, except only the Hotchkis rear sway bar (on the middle setting). Let's just say that wasn't a very safe setting, in any environment :P
bP, that is definitely a unique set up. I did the same, except only the Hotchkis rear sway bar (on the middle setting). Let's just say that wasn't a very safe setting, in any environment :P
#305
Super Moderator
iTrader: (2)
I'll say, You have definitely improved from the last video you posted. Noticeable difference. Those first two sets of runs were very impressive. Great save at the end of the first video and you said it best... gotta be happy keeping up with the Miata, a track staple, in a 3800 pd Sedan.
Definitely pushing it in the last set of runs lol
Definitely pushing it in the last set of runs lol
#306
Registered User
I'll say, You have definitely improved from the last video you posted. Noticeable difference. Those first two sets of runs were very impressive. Great save at the end of the first video and you said it best... gotta be happy keeping up with the Miata, a track staple, in a 3800 pd Sedan.
Definitely pushing it in the last set of runs lol
Definitely pushing it in the last set of runs lol
#307
From what I understand, having talked to the local Z car guys, we could use a lot more front roll stiffness, leaving the rears relatively soft compared to the rear. It really hooks the rear down and lets you power through corners without too much compromise.
My suspension tuning is probably different than yours, but I have a Hotchkis sway in the front only. Despite how counter intuitive that sounds, it works for me haha.
My suspension tuning is probably different than yours, but I have a Hotchkis sway in the front only. Despite how counter intuitive that sounds, it works for me haha.
I am trying to remember as I originally flushed it with this fluid last fall after everything got too hot. I don't recall any big difference, but I am hoping that combining the fluid with the diff cover and the exhaust wrap will solve my heat issues.
#308
When we split the exhaust to do the rear differential bushings recently we noticed that the gasket between the y-pipe and midpipe was cracked. Wow did the car make a lot of noise from that small crack! So I got a heavy duty metal replacement from Z1 Motorsports. I also picked up some for between the y-pipe and cats in case they go bad. Much, much quieter now. Anyone else have issues with gaskets breaking down under the heat of a track day?
#309
Registered User
What are peoples' thoughts on "digressive" valved coilovers. Some of the higher end coilovers have this feature, e.g. FA500, KWV3, BC DR come to mind.
Can anyone actually speak from experience on the difference between digressive vs. progressively valved shocks, especially in a HPDE scenario?
Can anyone actually speak from experience on the difference between digressive vs. progressively valved shocks, especially in a HPDE scenario?
#310
Super Moderator
iTrader: (7)
There are three styles of damping -- linear, progressive and digressive. As its name suggests, linear damping force increases in linear fashion as shaft velocity increases. Progressive damping increases damping force faster than linear as shaft velocity rises. Lastly, digressive reduces damping force as velocity rises. Of course, these are very simplified. OEMs use digressive damping for the most part.
There are many web sites that explain this stuff. I like Fat Cat Motorsports video series on youtube. While his bread and butter is Miata, he works on any rebuildable Bilstein damper. His shows many damper curves as he tests dampers on his dyno.
Look at Shim ReStacker,
There are many web sites that explain this stuff. I like Fat Cat Motorsports video series on youtube. While his bread and butter is Miata, he works on any rebuildable Bilstein damper. His shows many damper curves as he tests dampers on his dyno.
Look at Shim ReStacker,
#311
Registered User
There are three styles of damping -- linear, progressive and digressive. As its name suggests, linear damping force increases in linear fashion as shaft velocity increases. Progressive damping increases damping force faster than linear as shaft velocity rises. Lastly, digressive reduces damping force as velocity rises. Of course, these are very simplified. OEMs use digressive damping for the most part.
There are many web sites that explain this stuff. I like Fat Cat Motorsports video series on youtube. While his bread and butter is Miata, he works on any rebuildable Bilstein damper. His shows many damper curves as he tests dampers on his dyno.
Look at Shim ReStacker,
There are many web sites that explain this stuff. I like Fat Cat Motorsports video series on youtube. While his bread and butter is Miata, he works on any rebuildable Bilstein damper. His shows many damper curves as he tests dampers on his dyno.
Look at Shim ReStacker,
#312
What types of coolant temps do you guys usually see?
I have a Phase 2 radiator cap with a temp. gauge now and it reads about 170 on the commute to work, 200 after a "spirited" drive on some winding roads on the way to Road America, and 210 after a very easy 20 min touring session on Road America. The red section on the gauge starts at 220 and I think I will easily go over that on a full out track day. I am thinking a bigger radiator is in order to help with the temps. Last time I did a track day at Road America some coolant was spitting out a bit.
I have a Phase 2 radiator cap with a temp. gauge now and it reads about 170 on the commute to work, 200 after a "spirited" drive on some winding roads on the way to Road America, and 210 after a very easy 20 min touring session on Road America. The red section on the gauge starts at 220 and I think I will easily go over that on a full out track day. I am thinking a bigger radiator is in order to help with the temps. Last time I did a track day at Road America some coolant was spitting out a bit.
#313
Registered User
iTrader: (1)
I've just been looking at the csf triple pass radiator myself after following the tidings of a friend who had chronic overheating during the recent one lap of America event, eventually did a head gasket. They seem like cheap insurance, but a few reports from around the internet of them leaking, so I'm not sure what to look at. Someone over at the370z.com apparently does replacement bungs to stop the leaking/seizing.
I'm going to start logging water temps at my next track day to see what temps actually get to before biting the bullet on any more upgrades tho. Oh and I think the NISMO radiator cap is higher pressure, which will help, not sure what that pressure is tho
I'm going to start logging water temps at my next track day to see what temps actually get to before biting the bullet on any more upgrades tho. Oh and I think the NISMO radiator cap is higher pressure, which will help, not sure what that pressure is tho
#314
Funny you should mention that. A lot of the radiator caps that claim to be high pressure have the exact same rating or lower than the stock cap. In fact, the cap I have now claimed it was a higher pressure rating than stock for "improved performance." Nope, exact same rating as stock.
#315
Do any of you track guys run a different radiator? If so, what differences are you noticing in temps?
My coolant temp. gauge stays right in the middle, but it does spit some coolant out the top on long track days. Was thinking of a bigger radiator or vented hood- both would be good, but I figure the radiator would be better
I was thinking of this CSF radiator from Z1 Motorsports and a set of their silicone hoses. Thoughts?
My coolant temp. gauge stays right in the middle, but it does spit some coolant out the top on long track days. Was thinking of a bigger radiator or vented hood- both would be good, but I figure the radiator would be better
I was thinking of this CSF radiator from Z1 Motorsports and a set of their silicone hoses. Thoughts?