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is the oem stage 3 front splitter the best for downforce or the APR track diffusers (front and rear)? also needs to make sure it doesnt affect brake cooling LINK
I see many people like c7 carbon make ones but they lack the undertray? I only have the stage 1 pverty splitter and the rear oem wing (w/o the clear peice).. 17 GS.. I know they only offered ths tage 2 on the grand sport, but want additional downforce
is the oem stage 3 front splitter the best for downforce or the APR track diffusers (front and rear)? also needs to make sure it doesnt affect brake cooling LINK
I see many people like c7 carbon make ones but they lack the undertray? I only have the stage 1 pverty splitter and the rear oem wing (w/o the clear peice).. 17 GS.. I know they only offered ths tage 2 on the grand sport, but want additional downforce
Are you asking what is the best front splitter for downforce ? You might want to look at the more track focused options. katech, LG, GSpeed, etc.
Otherwise, the apr front splitter is slightly bigger than OEM stage 3. The rear "diffuser" is useless as it's too small and too tall to matter. Get the rear stage 2 and 3 pieces for the spoiler and swap the stage 1 pieces off.
Last edited by BrunoTheMellow; Jan 22, 2020 at 11:02 AM.
The GM ones are engineered to work with the car. So are ones from suppliers like Katech, LG, etc. The ones from suppliers that are mainly manufacturers of various aero products may not have any testing to show whether they work or not.
I have a c7 GS with stage 2 aero from the factory. From all the threads that I have read, the stage 3 oem makes a difference and is beneficial for our cars. The stage 3 wicker however is not since we do not have all that torque that overpowers the rear tires. Next season I will switch to stage 3 for the front along with 315 NT01s.
I have a c7 GS with stage 2 aero from the factory. From all the threads that I have read, the stage 3 oem makes a difference and is beneficial for our cars. The stage 3 wicker however is not since we do not have all that torque that overpowers the rear tires. Next season I will switch to stage 3 for the front along with 315 NT01s.
Thread hijack.....what wheels are you running in order to use 315 fronts? I see guys running 295s and 305s, but not aware of someone running 315s
As an aside, Stage 2/3 aero and the FE6 suspension is not an ideal mix. The swap to FE7 parts and the DSC controller made a WORLD of difference. Looking at Pi Toolbox data, it was clear the FE7 components work as advertised regarding roll and rear squat >100mph. On my GS, above 120mph the rear would squat nearly 2" with the FE6 rear spring. With the FE7 spring, it's ~0.5"
Last edited by 96GS#007; Jan 22, 2020 at 04:25 PM.
Thread hijack.....what wheels are you running in order to use 315 fronts? I see guys running 295s and 305s, but not aware of someone running 315s
As an aside, Stage 2/3 aero and the FE6 suspension is not an ideal mix. The swap to FE7 parts and the DSC controller made a WORLD of difference. Looking at Pi Toolbox data, it was clear the FE7 components work as advertised regarding roll and rear squat >100mph. On my GS, above 120mph the rear would squat nearly 2" with the FE6 rear spring. With the FE7 spring, it's ~0.5"
Interesting considering the rear is only like 15% stiffer.
18x11 let's you run 315s up front. Common Hoosier size with 345 rears on an 18x12.5 or 18x13.
Thread hijack.....what wheels are you running in order to use 315 fronts? I see guys running 295s and 305s, but not aware of someone running 315s
As an aside, Stage 2/3 aero and the FE6 suspension is not an ideal mix. The swap to FE7 parts and the DSC controller made a WORLD of difference. Looking at Pi Toolbox data, it was clear the FE7 components work as advertised regarding roll and rear squat >100mph. On my GS, above 120mph the rear would squat nearly 2" with the FE6 rear spring. With the FE7 spring, it's ~0.5"
18x11 Forgestars in the front. I do have the DSC controller and thinking of doing stg 3 on the front only. Only track I go to that has turns above 100 mph is WGI and Pocono. However they are banked and there is already a lot of compression going on. Are you seeing that squat with stage 2 or 3? Also does the front see that much compression?
18x11 Forgestars in the front. I do have the DSC controller and thinking of doing stg 3 on the front only. Only track I go to that has turns above 100 mph is WGI and Pocono. However they are banked and there is already a lot of compression going on. Are you seeing that squat with stage 2 or 3? Also does the front see that much compression?
I have factory stage 3 front, full length side skirts, stage 2 rear (ie no clear center section). The front compresses about a half inch. Adding the GS Z07 parts really balanced things nicely.
Like everything else with this hobby, there's always more/better given enough time and patience. For me, just being able to bolt on proven parts was of value. I've done the one-off custom made race car route and it became a PIA after awhile. Took the fun out of it.
I have factory stage 3 front, full length side skirts, stage 2 rear (ie no clear center section). The front compresses about a half inch. Adding the GS Z07 parts really balanced things nicely.
Like everything else with this hobby, there's always more/better given enough time and patience. For me, just being able to bolt on proven parts was of value. I've done the one-off custom made race car route and it became a PIA after awhile. Took the fun out of it.
So its half an inch with the FE7 springs?
I hear you on the mods. Been there done that and it stops being fun after too much is changed. I'm just adding seats and eventually some more power and that's it.
I hear you on the mods. Been there done that and it stops being fun after too much is changed. I'm just adding seats and eventually some more power and that's it.
The GS Z07 equipped cars use the GS FE6 front spring. Only the Z06 with the Z07 package uses a different front spring. For a GS Z07 equipped car....
Larger front sway bar and stiffer front bushings (obviously sized to fit)
Stiffer rear spring
Stiffer rear sway bar bushings (but retains the FE6 sway bar)
Different shocks....although the GM parts catalogs show the GS FE6 and Z07 (aka FE7) MRC shocks being the same so any difference must have been minor
Different shock programming which can be addressed with the DSC Controller
I wrote a thread that talks about the conversion I did. Lists the various p/n and pics of the install
Last edited by 96GS#007; Jan 23, 2020 at 02:10 PM.
I have a 2017 GS with Z07 package..is a DSC controller helpful? are these wheels that arent crazy expensive that I can put NT01's or R888r's on? granted I only have enough to swap the CC rotors for girodiscs and maybe that front diffuser.. I am in Maryland and TPC is closeby for DSC controllers
I have a 2017 GS with Z07 package..is a DSC controller helpful? are these wheels that arent crazy expensive that I can put NT01's or R888r's on? granted I only have enough to swap the CC rotors for girodiscs and maybe that front diffuser.. I am in Maryland and TPC is closeby for DSC controllers
I got Forgestars 18x11 and 19x12 for $1750 when they were doing $200 off.
I have a 2017 GS with Z07 package..is a DSC controller helpful? are these wheels that arent crazy expensive that I can put NT01's or R888r's on? granted I only have enough to swap the CC rotors for girodiscs and maybe that front diffuser.. I am in Maryland and TPC is closeby for DSC controllers
I personally think that the DSC sport controller is not worth the time and money if you have a car with the mag ride update.
The GS Z07 equipped cars use the GS FE6 front spring. Only the Z06 with the Z07 package uses a different front spring. For a GS Z07 equipped car....
Larger front sway bar and stiffer front bushings (obviously sized to fit)
Stiffer rear spring
Stiffer rear sway bar bushings (but retains the FE6 sway bar)
Different shocks....although the GM parts catalogs show the GS FE6 and Z07 (aka FE7) MRC shocks being the same so any difference must have been minor
Different shock programming which can be addressed with the DSC Controller
I wrote a thread that talks about the conversion I did. Lists the various p/n and pics of the install
A picture is worth a thousand words so data must be worth more The below is Pi Toolbox data before the Z07 sway bar and after. The bottom lines are front roll in degrees with the blue line being the Z07 sway bar and the red being the FE6 sway bar. The track is Auto Club Speedway.
T7 is a turn in name only. T8 is a short/gentle 30* right-hand turn, T9 is a very technical near 160* turn that at speed feels like you're trying to pivot around a traffic cone. A half to 1* reduction in roll doesn't seem like much but it allowed a much higher speed at the apex and exit even though I hit the brakes sooner and adjusted my turn-in by about 50 feet.
In general the car has a better feel and I'm no longer grinding the lower air dam on tight turns. The pic is with the FE6 suspension....the car really rolls!. I need to get some from the same angles now that I have the FE7 (Z07) setup.
Last edited by 96GS#007; Jan 24, 2020 at 04:34 PM.
A picture is worth a thousand words so data must be worth more The below is Pi Toolbox data before the Z07 sway bar and after. The bottom lines are front roll in degrees with the blue line being the Z07 sway bar and the red being the FE6 sway bar. The track is Auto Club Speedway.
T7 is a turn in name only. T8 is a short/gentle 30* right-hand turn, T9 is a very technical near 160* turn that at speed feels like you're trying to pivot around a traffic cone. A half to 1* reduction in roll doesn't seem like much but it allowed a much higher speed at the apex and exit even though I hit the brakes sooner and adjusted my turn-in by about 50 feet.
In general the car has a better feel and I'm no longer grinding the lower air dam on tight turns. The pic is with the FE6 suspension....the car really rolls!. I need to get some from the same angles now that I have the FE7 (Z07) setup.
I like having the air dams scrape, lets me know I got the speed right. I used to run the same wheels, C6 GS. However I needed more tire in the front. Really excited what 315s will do. Thanks for the good info. I will make incremental changes and see how it goes.
I would not recommend changing just the sway bar as these cars are pretty sensitive to front vs rear roll rates. The GS FE7 has a softer front spring with a stiffer front bar than the Z06 FE7 but both have the same stiffer rear spring and sway bar. You need to match these things as a set front to rear. I actually tried the bigger GS FE7 bar with the Z06 FE7 front and rear springs and it was not good.
I would not recommend changing just the sway bar as these cars are pretty sensitive to front vs rear roll rates. The GS FE7 has a softer front spring with a stiffer front bar than the Z06 FE7 but both have the same stiffer rear spring and sway bar. You need to match these things as a set front to rear. I actually tried the bigger GS FE7 bar with the Z06 FE7 front and rear springs and it was not good.
Yes I would definitely do the whole conversion. I was interested in how the car behaved since the bar would have the biggest effect. I've re read many believe the car needs a softer bar out back and this kind of accomplishes the same front and rear bar ratios. With 315s out front I dont want the steering to get too twitchy and sensitive.
Yes I would definitely do the whole conversion. I was interested in how the car behaved since the bar would have the biggest effect. I've re read many believe the car needs a softer bar out back and this kind of accomplishes the same front and rear bar ratios. With 315s out front I dont want the steering to get too twitchy and sensitive.
I am on 305 scrubs squared on my Z06 Z07 and it drives fantastically. Rarely understeers. A lot of fun and turns like a ****. I'm switching to 315/335 R7 scrubs next. I'll see how it handles.
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c7 downforce diffusers?
I see guys running 295s and 305s, but not aware of someone running 315s
The below is Pi Toolbox data before the Z07 sway bar and after. The bottom lines are front roll in degrees with the blue line being the Z07 sway bar and the red being the FE6 sway bar. The track is Auto Club Speedway.
