For the guys that swapped to the QA1 DD403 front shocks, what springs did you go with?
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For the guys that swapped to the QA1 DD403 front shocks, what springs did you go with?
I'm running 300# 9" long springs in the front with my QA1 DD403 coil overs. Very comfortable ride.
Jim
33 Hot Rod w/ 302 & Tremec T5; paint color is 68 Ford Mustang GT LimeGold
https://thefactoryfiveforum.com/show...s-Build-Thread
I did pretty much the same as Jim, QA1’s
Front - 9” 300 lbs
Rear - 12” 275 lbs
I did get some 8” 250 lbs springs from Jim that I decided not to use.
I’ll be giving them away and then selling the Koni coilovers that came with my hotrod.
(The Koni’s were sold)
Last edited by JimLev; 10-19-2023 at 08:39 PM. Reason: Sold Koni’s
'33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
Garage Built, Driveway Painted.
I went down to 220 on the fronts. A lot nicer than the original... I left the IRS springs as is.
All I do is cruising. If you want to AutoX, you actually need to go the other way!
Steve
Gen 1 '33 Hot Rod #1104
347 with Holley Sniper & Hyperspark, TKO600, IRS, 245/40R18 & 315/30R18, DRL, Digital Guard Dog keyless Ignition
So what's the deal going with shorter springs? Aren't these supposed to be 10" springs?
The springs touch if you lower the car on the longer springs. I’m running 800/450 springs now and all 7”![]()
James
FFR33 #997 (Gen1 chassis, Gen2 body), license plate DRIVE IT says it all! build thread
My build: 350SBC, TKO600, hardtop, no fenders/hood, 32 grill, 3 link, sway bars, 355/30r19
Previous cars: GTD40, Cobra, tubeframe 55 Chevy, 66 Nova, 56 F100
Springs all depend on the weight of the car. The back won’t change much but the front can depending on the size of the engine and if it cast iron or aluminum.
'33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
Garage Built, Driveway Painted.
33 Hot Rod w/ 302 & Tremec T5; paint color is 68 Ford Mustang GT LimeGold
https://thefactoryfiveforum.com/show...s-Build-Thread
No problem, for some reason FFR's spring were short little things (8"), that's why in the rear most builders have their Koni's adjust almost to the top of the threads to get the right ride height. Even in the front the 8" seems too short which is why I switched to the 9".
Jim
33 Hot Rod w/ 302 & Tremec T5; paint color is 68 Ford Mustang GT LimeGold
https://thefactoryfiveforum.com/show...s-Build-Thread
They sent me 9" fronts and 10" rears. I had to wait a couple of months for the front springs to show up.
33 Hot Rod Stage 1, Gen.2 ordered 11/11/2021 started June 12, 2022, LS3 E-Rod crate engine, Tremec TKX, 8.8 WITH 3.55 Ratio and limited slip with 31 spline axles.17X8 and18x10 Race Star wheels wrapped in Conti Extreme contact DWS tires, Mustang Cobra brakes all around. Electric PS and AC. Hard top, electric windows and bike fenders. First Start 5/31/2023. Go-Kart 6/2/2023.
33 Hot Rod w/ 302 & Tremec T5; paint color is 68 Ford Mustang GT LimeGold
https://thefactoryfiveforum.com/show...s-Build-Thread
You’re not wrong.. but after 2.5 years of tweaking I finally have a car that plants the outside tire correctly.. which equals speed! First in class last week
IMG_0356.jpeg
James
FFR33 #997 (Gen1 chassis, Gen2 body), license plate DRIVE IT says it all! build thread
My build: 350SBC, TKO600, hardtop, no fenders/hood, 32 grill, 3 link, sway bars, 355/30r19
Previous cars: GTD40, Cobra, tubeframe 55 Chevy, 66 Nova, 56 F100
What is the advantage of longer springs assuming the same spring rate?
I got daring yesterday and took my Speedstar for a drive out of the neighborhood. It gave me a chance to get up to about 50 mph and go through the gears. One thing I noticed was the back end was pretty jarring, the front didn't seem bad.
Since the spring is way up the body of the shock there is plenty of room for a longer spring. Maybe a progressive wound spring or dual rate springs.
Also, what are folks running for air pressure on the hot rod. Saw a post where the recommended air pressure for the roadster is 22-23 psi. Don't know how much heavier the the hot rod is but based on this I should have a lot less than the 35 psi currently in the tires.
Gen 1 '33 Hot Rod #1104
347 with Holley Sniper & Hyperspark, TKO600, IRS, 245/40R18 & 315/30R18, DRL, Digital Guard Dog keyless Ignition
Aren't the Koni springs a 2.5" spring? Same as the QA1? If that's the case, Can't I use the Koni 400# on the QA1 as starting point?
James
FFR33 #997 (Gen1 chassis, Gen2 body), license plate DRIVE IT says it all! build thread
My build: 350SBC, TKO600, hardtop, no fenders/hood, 32 grill, 3 link, sway bars, 355/30r19
Previous cars: GTD40, Cobra, tubeframe 55 Chevy, 66 Nova, 56 F100
400 in the front are pretty stiff.
I changed my front and rear springs, see post #3.
I still have 8” 250 lb springs for free if you or anyone else wants them.
'33 Hotrod, #1047 Gen 1, delivered on 2/27/18, go cart on 9/24/18.
LS3 w/Gearstar Level 3 4L65e Tranny, Yank converter, Lokar shifter, Electric PS, Vintage AC/Heat/Def, 8.8" 3.55
TorqThrust II Wheels w/Toyo Proxy T1 Sport Tires, F 235/45ZR17 R 295/35ZR18
Garage Built, Driveway Painted.
QA1 recommends a 10" for the DS403 shocks. The ones I have from FFR are 8" .. should I go with 9" or 10"? Keep in mind, i'm installing these inverted with the more cone shaped QA1 top retainers 9018-113
A little more measuring, I can see with the std shock top retainer that a 10" would be correct, with the more tapered top retainer the 9" should be the ticket.