: QA1 unexpected result



stkshkr
02-19-07, 08:44 PM
I installed my QA1's today. It lowered the rear by about 1 1/2 inches. I could have lowered the front 1/2 inch by removing the rubber spring perch, but I didn't do it. Basically lost the rake and sits level now.

http://img1.putfile.com/thumb/2/4921271864.jpg (http://www.putfile.com/pic.php?img=4813545)

PS: FG2's for sale in the classifieds

ctsvflorida
02-19-07, 08:50 PM
QA1 is springs? Can you take a pic of the entire cars height? I would think 1.5" is a bit much without lowering the front, no?

I would love to lower my car like 1" back and 1/2" front!

stkshkr
02-19-07, 09:12 PM
Best I can do for now.
http://img1.putfile.com/thumb/2/4921555884.jpg (http://www.putfile.com/pic.php?img=4813763)

valdeztke
02-19-07, 09:27 PM
isnt there a reason for a rake?

stkshkr
02-19-07, 09:38 PM
valdeztke
I guess so, but I don't want it. I'm looking for weight transfer, hence the 90/10 shocks in the front.

CTSVFLORIDA
It measures 26 3/4 inches at the rear (from the ground to the lip of the fender well) and 27 3/4 in the front (could be 1/2 lower with the perch removed). Hope this helps.

vettethret
02-19-07, 10:16 PM
I installed my QA1's today. It lowered the rear by about 1 1/2 inches. I could have lowered the front 1/2 inch by removing the rubber spring perch, but I didn't do it. Basically lost the rake and sits level now.

http://img1.putfile.com/thumb/2/4921271864.jpg (http://www.putfile.com/pic.php?img=4813545)

PS: FG2's for sale in the classifieds

Thats great news for me. I am ready to order these. I wonder if this happened because they are drag shocks or because the shock bodies are shorter than stock. Are these the ones from DND? It looks like thses shocks and the ground control are the way to go to get the car on the ground and maintain some travel.:thumbsup:

valdeztke
02-19-07, 10:29 PM
What these guys said


Handling will be affected to some degree, but exactly how much I don't know. By lowering the car you're lowering the center of mass, which is generally a Good Thing. But you're also lowering the roll center, which is a Bad Thing. So in terms of body roll, its a question of which changes faster - roll center or center of mass. Usually the answer is roll center, but you'd have to look at the suspension geometry to calculate the actual results.

What I'm saying is that lowering the car will quite likely make it lean more around corners - at least until the outside suspension compresses and hits the bump stop. But once it does that your suspension compliance goes to nil, and so does your grip on any surface less than perfectly smooth!

Of course this doesn't apply if you're also changing spring and sway bar rates to compensate for changes in the roll center - its certainly possible to get good handling with a very low car.

Also, lowering the car will change the camber and toe slightly, which will affect handling, but you can make up this difference by realigning after lowering.

As far as losing the rake, yes that is something to worry about. The car depends on that as part of it's aerodynamics, in particular to help form a partial vaccum under the car and keep it on the road at speed. You'll need to retain approximately the same rake as the factory specs, although you could reduce it a little if the car is lowered, reducing the volume under there. This is especially true if you get the front splitter within 50 mm or so of the ground.

Of course this suckdown effect is mostly at higher speeds, and mostly for track use (as public roads are usually so lumpy its hard to get much vaccum under there anyway). So if you're just driving around under 100 KPH it probably doesn't matter much. But I'd want to be very careful and do some good modelling and / or wind tunnel testing before taking the car over 200 KPH!

stkshkr
02-19-07, 10:35 PM
Yes they are from DND. The rears have the regular QA1 valving (same as for road racing), the fronts are valved for drag racing. I think you'll be happy with them.

vettethret
02-19-07, 11:37 PM
Yes they are from DND. The rears have the regular QA1 valving (same as for road racing), the fronts are valved for drag racing. I think you'll be happy with them.

I think I will be too. This week I will be ordering the GC springs 650/700lb, qa1's from DND, hotchkis with zo6 endlinks and Kars III. I cant wait to see the differrence. Are you happy with the customer service from DND?

stkshkr
02-20-07, 12:48 AM
Very pleased with DND.

rgd
02-20-07, 01:43 AM
I installed my QA1's today. It lowered the rear by about 1 1/2 inches. I could have lowered the front 1/2 inch by removing the rubber spring perch, but I didn't do it. Basically lost the rake and sits level now.

http://img1.putfile.com/thumb/2/4921271864.jpg (http://www.putfile.com/pic.php?img=4813545)

PS: FG2's for sale in the classifieds

You need the Ground Control Kit now. Then you will have absolute power to raise and lower at will!
It's true. :highfive:

Chef
02-20-07, 10:04 AM
:thumbsup: