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View Full Version : Lowered Tom's (SBCA96) Avanti



grobb284
02-28-2007, 12:05 PM
I Photo Shopped Tom's Avanti to see what it would look like lowered approximately 2 1/2 inches. This would approximate the height of the stainless steel Avanti chassis with 275-40-17 rears and 245-45-17 fronts. Tom's car with 17" rims and 245-45-17 tires all around were excellent for the photo modification.

We will not be using copies of Tom's rims however, but the Bullitt style.

Photo Shopped picture
http://shutter14.pictures.aol.com/data/pictures/05/004/6F/FF/8D/C2/H6mWKm95lPSzJBoCGb-uq7dHGxgmJ2Wf0280.jpg

Tom's car
http://hometown.aol.com/sbca96/images/Gtechtest/Gtech_Testing_day2_006a.jpg



Tom wisely pointed out the ramifications of lowering this much.

We kept the X-member flush with the bottom of the stainless chassis rails, where the original Avanti X-member may drop as much as 1 1/4 inches.

Also the exhaust is now above the bottom of the frame rails, where the hog troughs used to be.

The rims have a 45 mm offset, keeping the wheels well inboard

sbca96
02-28-2007, 12:18 PM
Yah .. it looks neat, but I have trouble dragging the exhaust now, I cant
even imagine how I would get over a simple speed bump with it that low.
I have considered a 1 inch drop all around, to keep the stance I nailed. At
the moment my glasspacks are all scraped up, I can measure the frame
and exhaust distances tonight when I get home. I seem to think I am at
around 4.5 inches ground clearance at the lowest point. Maybe I have
more than that, but cant be that much.

Tom

'63 Avanti, zinc plated drilled & slotted 03 Mustang Cobra 13" front disc/98 GT rear brakes, 03 Cobra 17" wheels, GM alt, 97 Z28 leather seats, soon: 97 Z28 T-56 6-spd, Ported heads w/SST full flow valves, 'R3' 276 cam, Edelbrock AFB Carb, GM HEI distributor, 8.8mm plug wires

stude freak
02-28-2007, 02:45 PM
No offense intended but it looks like front wheels don't center in wheelwell.Looks like the body don't fit the chassis.If it was my car that looked that nice i would go back to original stance.Sometimes you can just go to far.

David Baggett Mantachie,Ms.

N8N
02-28-2007, 06:47 PM
I think with a drop that low you might want to ease up on the rake a little bit. The closer you get to the ground, the more exaggerated the rake looks. However, I like the look esp. with the big fatty rims. Personally I like Tom's choice of wheels, I think they look better than the Bullitt ones would, but I'm willing to be proven wrong (that side view might be just the ticket to plug into that wheel selector program, if anyone knows how to hack it)

nate

--
55 Commander Starlight
http://members.cox.net/njnagel

DEEPNHOCK
02-28-2007, 07:21 PM
Ya know.. Tires in wheelwell's are funny things..
If you change them, size wise, it can look strange....
I just put 'glass rear fenders on my truck that the molds were pulled from stock fenders.. The wheelwells look strange with a fat 15" tire in there as compared to a skinny 16" tire. I am tempted to take a SawZall to the wheelwell to fix the radius...
Avanti's are like that too... The curved radius is sensitive to tire placement and diameter..
Get it right... Way cool..
Off a little...Strange looking.
Tough to get it right, for sure...
Jeff[8D]


quote:Originally posted by stude freak

No offense intended but it looks like front wheels don't center in wheelwell.Looks like the body don't fit the chassis.If it was my car that looked that nice i would go back to original stance.Sometimes you can just go to far.

David Baggett Mantachie,Ms.

Dick Steinkamp
02-28-2007, 08:26 PM
quote:Originally posted by sbca96

Yah .. it looks neat, but I have trouble dragging the exhaust now, I cant
even imagine how I would get over a simple speed bump with it that low.


To me, Karl's sits about right for a big wheeled Avanti...

http://i117.photobucket.com/albums/o50/twnchgr/CruiseninPlamSpringsringataAvantiow.jpg

How's the drive-ablility Karl?



http://thenobot.org/images/s2d/s2d_01.jpg

sbca96
02-28-2007, 11:21 PM
I measured the underside of my car at a few points, it seems I guessed
about right. The front center pivot "crown" is 6 inches off the ground. The
drivers side head pipe is 3-7/8 off the ground, and the X-member is about
4-7/8 off the ground. The mufflers are right there with it. If I was to do
as the picture shows, my head pipe would be roughly 1-3/8 off the ground.
I might be able to tuck the exhaust up more, but that puts the X-member
at a very uncomfortable 2-3/8 off the ground. Last time I checked speed
bumps were considerably taller. As I have mentioned on this in the past,
Avanti wheel openings are very stylized. The arch is higher than it needs
to be, and pulled back off center to the tire. The front of the arch is down.
This becomes more and more obvious as the car is lowered. The Avanti
II is even worse, and has a strong history of cracking fenders on turns. I
think that with an Avanti, you have to ignore the wheel openings, & judge
the height by the top of the fenders.

Tom

Karl
03-01-2007, 02:55 AM
Drive-ablilty is better I think. Handles far better. With the car this low you definitely dont storm country roads. Wheel well measure at 27 1/4", frame crossmember are 4 1/2"F / 4 3/4"R lowest point is under the exhaust X at 3 5/8". But thats because of the 3" pipesMy tire and wheel combo is 255/35/20x8.5R 225/35/20x8.5F
http://i117.photobucket.com/albums/o50/twnchgr/100_2288.jpg
I don't think you could lower a Avanti much more and still drive it normally.

63 Twin Supercharged Avanti
64 Avanti R3w/NOS
88LSC Avanti 350 Supercharged w/NOS

grobb284
03-01-2007, 02:05 PM
Karl:
Would you please post some side views of your Avanti?


Tom:
I'll have to check, but I think my lowest point is just under 5" according to the drawing. But that rarely ever is real world.

sbca96
03-01-2007, 05:21 PM
I will have to measure my wheel wells, but it sounds like both our cars are
at the same height right now Karl. You lowered yours, but your wheels
are probably taller than mine (rolling diameter). I might lower mine as
much as an inch more, but certainly not 2-1/2. As for handling, it rides
great, the 45 series tire has a decent amount of flex still, & the width helps
with small potholes. I love how well the car corners, and when I get the
Bilstein shocks on, and the larger sway bars it will be even better. I would
like to have a set of springs made by Eaton Springs, but I need to find out
the stock heights first. If my car is already "sagged" lower, than replacing
with new stock height springs will RAISE it! If I get front springs that are
too short, I guess thats better, I can always put spring spacers under the
coils like they did on the Avanti II. Love that exhaust Karl, when are you
going to make one for my Avanti, I dont need 3 inch though, 2-1/2 would
be fine![:p];)

http://hometown.aol.com/sbca96/images/karls_avanti/100_2069_00a.jpg

http://hometown.aol.com/sbca96/images/karls_avanti/100_2071_00a.jpg

Tom

Karl
03-01-2007, 05:37 PM
http://i117.photobucket.com/albums/o50/twnchgr/1avantitoogo.jpg

63 Twin Supercharged Avanti
64 Avanti R3w/NOS
88LSC Avanti 350 Supercharged w/NOS

sbca96
03-02-2007, 02:17 AM
Karl, looks even lower than the pictures you sent me a few months ago!!

BTW measured the wheel openings:

Front is : 27-11/16 (highest point)
Rear is : 28-3/8 (highest point)

On the front wheel opening the highest point of the "arch" is 4 inches
back from the centerline of the wheel.

Tom

Karl
03-02-2007, 03:17 AM
http://i117.photobucket.com/albums/o50/twnchgr/2240454450032979576S600x600Q851.jpg
Before Lowering,
remeasured 4" behind axel center its now 27 3/8" both front & rear

63 Twin Supercharged Avanti
64 Avanti R3w/NOS
88LSC Avanti 350 Supercharged w/NOS

sbca96
03-02-2007, 04:07 AM
Karl, I'm confused, you lowered it twice? Arent the pictures I posted
the ones you sent me after you lowered it the first time? I dont seem
to remember the rear tire being "tucked" like that before.

Tom

EDIT : I measured the diameter of the tire, without weight on it, its
26 inches in diameter. Weighted down, the center of the rim is about
11-11/16" from the ground, thats with contact patch crush.

Also, for reference I measured the lowest point on the body, which is
the rear of the front wheel opening. Its 6-1/2" from the ground. The
2-1/2" drop would put the fiberglass only 4 inches off the ground at
the location a speed bump would hit. Take in account rebound and you
could have an unfortunate result. Make sure your frame protects this
area, and you might consider some kind of replaceable scuff plate.


quote:Originally posted by Karl

Before Lowering,
remeasured 4" behind axel center its now 27 3/8" both front & rear

wcarroll@outrageous.net
03-03-2007, 04:30 AM
Hey Tom, maybe its because the car is empty in your pics and has two passengers in Karl's pics??? I agree it does look lower......and me likes it :)

grobb284
03-03-2007, 02:29 PM
I checked the drawing, with 245-45-17 front and 275-40-17 rear, the stainless Avanti frame should be 4.75 ground clearance at the front with 5.07 clearance just before the kick-up over the rear axle. This is with allowance of some collapse of the tire diameter due to the weight of the vehicle. Remember this X-member is flush with the bottom of the 4" frame rails, and doesn't have the drop of the factory Avanti X-member. Also the exhaust (2 1/2 and 2 3/4 dia.) is flush with the bottom of the 4" frame rails, where the hog troughs used to be.

The old advertising slogan which is very true: "Your actual results may vary." [8D]

sbca96
03-03-2007, 05:23 PM
Just make sure your frame hangs lower then the rear of the front wheel
opening, so that the frame contacts any "nasties" & protects the fiberglass.
From my measurements, it sounds like your frame might be up higher than
the fiberglass, which could have unfortunate consequences.[:0][B)]

Tom


quote:Originally posted by grobb284

the stainless Avanti frame should be 4.75 ground clearance at the front with 5.07 clearance just before the kick-up over the rear axle. This is with allowance of some collapse of the tire diameter due to the weight of the vehicle.

Karl
03-03-2007, 07:11 PM
The 4.75 - 5.07 should be fine.The Twin is 4.5 - 4.75 with tire sizes 25.875 - 26.75. The rear of the front opening is and inch higher than the frame.After looking at my Avanti's. The front wheel opening does look off on the photo shop picture. Toms tires are a little tall than mine . But look farther forward in the wells?[?]
I measured all three cars and the tires are centered in the wells[?]
Look closely at both cars and you can see the difference ;)As far as stance goes. The Twin has the same 1/2" of rake it had before it was lowered. This was done the make sure I didn't screw up the steering geometry .[^]

63 Twin Supercharged Avanti
64 Avanti R3w/NOS
88LSC Avanti 350 Supercharged w/NOS

sbca96
03-04-2007, 04:04 AM
I was refering to Grobb's custom frame. He is moving the frame up in
relation to the body (the whole point of this thread) and his X-member
is flush with the bottom of the frame. I was only pointing out to make
sure that the frame will hit the ground before the body. I know its
obvious, but at last I heard he didnt have a body yet to confirm this.

I was posting measurements on MY car to explain WHY I wont be lowering
my Avanti 2-1/2 inches.;) Regardless of how it looks after.

Tom


quote:Originally posted by Karl

The 4.75 - 5.07 should be fine.

grobb284
03-05-2007, 11:07 AM
quote:but at last I heard he didnt have a body yet to confirm this


Here are some photos of where we placed the pieces of the new frame rails on a "borrowed" Avanti body last spring. The frame rails are probably an inch farther extended than the hog troughs. The frame will probably bottom out first before the body as far as the the length between the wheel well arches.

We have not yet obtained a body to install on the chassis, however, and continue to use the "borrowed" Avanti body.

I am considering purchasing the borrowed body to make the floor pan mock-up. Would anyone be interested in purchasing it after we cut part of the floor pan? Contact me directly via PM or email, not in this discussion thread.

http://www.members.aol.com/grobb284/avanti3.jpg

http://www.members.aol.com/grobb284/avanti6.jpg

http://www.members.aol.com/grobb284/avanti9.jpg