Spring rates with gt4 aero kit

[chillindrdude]

was the splitter an easy bolt on? or bumper mods needed?

[SYT_Shadow]

Originally Posted by chillindrdude

was the splitter an easy bolt on? or bumper mods needed?

IIRC the GT4 front aero requires chopping up your stock bumper, or buying another bumper to chop that one up instead

[Lienrocs]

Originally Posted by chillindrdude

was the splitter an easy bolt on? or bumper mods needed?

You either need to put a bunch of holes in the stock bumper or get a GT4 bumper with all the mounting holes in it. For the splitter support I believe you're gonna have to put some small holes in some of the plastic/ducking behind the bumper as well.

I think getting the GT4 bumper would be the easier way to go.

[Docall]

Ended up going with Fall-line for setup. First off the shop, and service is top notch. These guys know what they are doing. JP set me up with custom jrz 3 way, the first of its kind with a true coilover for the rear from jrz. Spring rates are 1000f, 800r. Shook it down at Road America a few weeks ago and needed a little height adjustment. Will be heading to VIR later this month and should be really able to start pushing on new pirelli slicks.

[Lienrocs]

Originally Posted by Docall

Ended up going with Fall-line for setup. First off the shop, and service is top notch. These guys know what they are doing. JP set me up with custom jrz 3 way, the first of its kind with a true coilover for the rear from jrz. Spring rates are 1000f, 800r. Shook it down at Road America a few weeks ago and needed a little height adjustment. Will be heading to VIR later this month and should be really able to start pushing on new pirelli slicks.

Oh heck yes. Do you have any pictures of how the rear canisters are routed/mounted?

Can't wait to hear the feedback on this.

[Docall]

Originally Posted by Lienrocs

Oh heck yes. Do you have any pictures of how the rear canisters are routed/mounted?

Can't wait to hear the feedback on this.

I’ll get some more pics in the next week or so

[Lienrocs]

Originally Posted by Docall

I’ll get some more pics in the next week or so

Awesome.

[Docall]

Originally Posted by Lienrocs

Awesome.

I’ll get more pics from the wheel well next time I change tires

[Lienrocs]

Originally Posted by Docall

I’ll get more pics from the wheel well next time I change tires

Nice. Did you use existing holes to mount them like that or did you drill some and put some inserts in?

[sly1types]

Originally Posted by Lienrocs

Awesome.

Originally Posted by Lienrocs

Awesome.

This is how did mine. There is 2 holes down there that I brought the lines through then I bought rubber grommets for where it goes through the hole.

[Lienrocs]

Originally Posted by sly1types

This is how did mine. There is 2 holes down there that I brought the lines through then I bought rubber grommets for where it goes through the hole.

That's how I have mine done in my E92. That won't work in a GTS though, the water injection system is in that space.

[stevehifi]

about how much did the JRZs run you? do they come with their own Camber plates?

Are you running stock weight? GT4s are about 3150lbs, so if you're still at stock GTS weight (~3600lbs) then that could of also been a contributor to your issues with the GT4 downforce.

[Lienrocs]

Originally Posted by stevehifi

about how much did the JRZs run you? do they come with their own Camber plates?

Are you running stock weight? GT4s are about 3150lbs, so if you're still at stock GTS weight (~3600lbs) then that could of also been a contributor to your issues with the GT4 downforce.

My car came in at 3400 with a half tank of gas.

Sparco buckets, ap brakes, spl arms, 18in e88's, aftermarket suspension.

I'm guessing OP has non standard seats at the least so is probably pretty close to the same weight. Not GT4 car weight but definitely lighter than 3600.

[rcompound]

I followed @docall at VIR this weekend. Rocket fast and the class of the Intermediate group. Should have been in Advanced and tortured some of those ZL1's and ZO6's. Proud of @docall as he was rocking it and repping the GTS community.

[Docall]

Originally Posted by Lienrocs

My car came in at 3400 with a half tank of gas.

Sparco buckets, ap brakes, spl arms, 18in e88's, aftermarket suspension.

I'm guessing OP has non standard seats at the least so is probably pretty close to the same weight. Not GT4 car weight but definitely lighter than 3600.

Running sparco qrt-c seats

[Docall]

Originally Posted by rcompound

I followed @docall at VIR this weekend. Rocket fast and the class of the Intermediate group. Should have been in Advanced and tortured some of those ZL1's and ZO6's. Proud of @docall as he was rocking it and repping the GTS community.

Was a great weekend! Moved up to green, and was running quicker than the gt4 club sports out there. Car was running great. Awesome track. Had a great teacher that helped!

[JustAnothaM4]

Back to the original question...is it possible to increase the OEM KW spring rates a bit?

OEM M4 GTS Triple Adjustable ClubSport
Front: 400 lbs/in
Rear: 685 lbs/in

Can we increase the rates to the standard KW 3W Clubsport rates at:
Front: 575 lbs/in front
Rear: 800 lbs/in rear

[FaRKle!]

Originally Posted by Project M4GTS

Back to the original question...is it possible to increase the OEM KW spring rates a bit?

OEM M4 GTS Triple Adjustable ClubSport
Front: 400 lbs/in
Rear: 685 lbs/in

Can we increase the rates to the standard KW 3W Clubsport rates at:
Front: 575 lbs/in front
Rear: 800 lbs/in rear

Possible to put the springs on there, sure. How that matches up with the damping curves, you'd need to dyno the dampers to find out.

[redrumm3]

Originally Posted by Project M4GTS

Back to the original question...is it possible to increase the OEM KW spring rates a bit?

OEM M4 GTS Triple Adjustable ClubSport
Front: 400 lbs/in
Rear: 685 lbs/in

Can we increase the rates to the standard KW 3W Clubsport rates at:
Front: 575 lbs/in front
Rear: 800 lbs/in rear

Originally Posted by Project M4GTS

Back to the original question...is it possible to increase the OEM KW spring rates a bit?

OEM M4 GTS Triple Adjustable ClubSport
Front: 400 lbs/in
Rear: 685 lbs/in

Can we increase the rates to the standard KW 3W Clubsport rates at:
Front: 575 lbs/in front
Rear: 800 lbs/in rear

That's not that big a jump in spring rate and I would guess they will work, but I would verify with KW. As was already mentioned you will otherwise need to dyno the shocks. It is for sure going to require an adjustment in compression and rebound settings.

[JustAnothaM4]

Originally Posted by redrumm3

That's not that big a jump in spring rate and I would guess they will work, but I would verify with KW. As was already mentioned you will otherwise need to dyno the shocks. It is for sure going to require an adjustment in compression and rebound settings.

I called KW and we can go up 200lbs/in without needing a rebuild.

I might go this route before spending 9k on MCS 3WR and leaving the KW Clubsports useless.

Time to measure spring lengths. The spring diameter should be 60mm all around. Might as well switch to the GC rear weight jacks for ease of adjustment and to get a lower rear height.

[daveishi]

Originally Posted by JustAnothaM4

I called KW and we can go up 200lbs/in without needing a rebuild.

I might go this route before spending 9k on MCS 3WR and leaving the KW Clubsports useless.

Time to measure spring lengths. The spring diameter should be 60mm all around. Might as well switch to the GC rear weight jacks for ease of adjustment and to get a lower rear height.

Did you ever get around to swapping to stiffer springs? Interested in what you ended up going with and also whether you installed rear weight jacks as I'm looking into doing that on mine as well. TIA

[JustAnothaM4]

Originally Posted by daveishi

Did you ever get around to swapping to stiffer springs? Interested in what you ended up going with and also whether you installed rear weight jacks as I'm looking into doing that on mine as well. TIA

No, I switched to Ohlins TTX Pro suspension.