1991Z07

Sorry for the dirt....

We are in the midst of having 1.5 miles of road re-paved to our house. The car is a mess from the road (and the pollen) right now. It (usually) looks MUCH better than that.

Mike: I understand...I just don't trust a hole drilled through a spring never "intended" to have one, and don't trust it.

If it is working for you...great. It isn't something I'd ever do to my car though.

ddahlgren

Does anyone take the suspesion geometry into consideration when lowering the car? camber curves roll center bump steer etc? Or is everyone just going for a look as in if it looks fast it must be. I will grant you lowered the center of gravity an inch maybe 2 but there is a bunch more to it than that. It is a shame no one makes a dropped spindle as that would be the fastest easiest way to go and not screw with the geometry.

5abivt

[QUOTE=1991Z07;1580396996]

My Z07 with the lowering kit looks JUST like this...

Of course...mine is white and looks better



But that blue is very nice as well.
QUOTE]

WHite is nice as well but you need the front oz monte carlos up front and not 4 rears because the rears are 10" wide and the spokes look tiny tucked in for the added width. Those 18s look like 17s !

This is how oz's are done


Here's how to do a white c4... coincidentally.. by me (except for the hash stripes.. owner did that ugh) !!

Shock96

Personally, I pay very close attention to all those variables when setting up suspension. I would be curious to know where the roll center of the C4 is.

ddahlgren

The front is easy as it is like any other double a-arm suspension the rear would take a bit of thought. I would thinj the intersection of half shaft and canber rod to form the instant center from there to the center of the tire tread contact patch where ever that crosses the center line of the car I would think be the rear roll center with the dogbones handling the anti-dive point. An interesting aside to this is the DRM camber brackets have a relocated camber rod mounting point and a horivontal slot and the VB&P bracket has a verticle slot that could be used to make changes in the rear roll center.
Dave

1991Z07

I run my car square...it's the way it came from the factory. The Z07 had 255's all the way around.

My OZ's have 295's on them, and that was the look I wanted. The offset has the tires JUST inside the fender lips.

But I didn't really do it for looks...I actually drive the car as intended, and it sticks like glue around turns.

@ddahlgren: Yes, I actually took geometry into account when making my changes. I have all the DRM brackets for the rear, and after making the changes to the suspension I took FTD's in the first 5 or 6 autocrosses I attended. No other changes were done over the winter except the suspension...and I gained about 1.5 seconds on short courses.

Here is a picture of my car at TWS. This particular weekend our club had the SpeedGT cars from GrandSport Speedway attending our high-speed autocross. I was lapping 1 second slower than them, and I had about 500+ lbs on their '96 and 2001 Z06 (#18 of the 24 or so sold in the crate from GM).



So, yes...the changes worked fine for me.

turbotim23

Well I've been thinking of using a kit made for newer corvettes to take care of the steering arm misalignment of being lowered. I don't think they sell one for a c4 so I'm hoping the newer corvette kit will fit. I'm also setting up my car with a bumpstop to keep from bottoming out the shocks and ruining them and I set up the front skidframe with a roller in it so it would roll over speed bumps rather than drag over them. I tried to think about what problems it might have being lowered and fix them.

95wht6spd

What size wheels on the white w GS stripes?

Midnight 85

Absolutely! The others have some ingenious ideas but I don't think I would want either setup on a street car. No potholes on a race track. This is merely my opinion and in no way a slam against Kubs or Aardwolf both of your solutions look great,,, for a race car.

Black89Z51

I could lower the front at least 1.5" more if I wanted to. The rear needs to be adjusted down, but that's no biggie.

1991Z07

NO...but there are curbs, and agricultural racing (aka off-track excursions) have all kinds of variables to throw into the mix.

Sure, some people say you plan for the 80%...but I always plan for the 98%.

For the expense, engineering and time...a $1700-$2250 KNOWN solution with DRM coil-overs beats a WAG (wild-a$$ed guess) for me every time.

92ragtop

I love that hood-mounted secondary steering wheel for when you want that "wind in your face" experience.

Crepitus

Crafty little devil aint ya! that setup looks a lot like a transverse leaf conversion VB&P offers for the C3s. The conversion has an adjustable spring rate feature.

1991Z07

That's the gas golf cart...no governor and clips along over 50 mph...

No seat belts, no roll protection. The NHTSA would have a small bovine over that one...