What's new
By:
Filters

Dust Buggy

150 C/300 F is runaway temp for silicon devices. But the heat is trying to go out of them, so ambient must be less than 150. Beyond that they start to conduct and melt themselves.
 
I am going to wrap the logs and crossover or heat shield them and add heat shield to the panels.
The front of the engine compartment is open so it will get air flow from the front. I have thought about putting a small fan somewhere to move air through the engine compartment when sitting with no airflow to keep the temps down so panels don’t get super hot as well as wires and hoses.
 
Front brake lines are in. Still need to get them crimped. The hardware is BQ aka Brake Quip. The crimp machine adds the DOT mark on the ferrule.

IMG_3797.JPG



IMG_3799.JPG



IMG_3798.JPG
 
While trying to figure out how to run seat belts mounts for the rear bench that is over the top of the massive trans cooler and having no room, I started to think maybe I should down size the trans cooler. Maybe I should downsize the steering cooler. What if I can double stack them and use one fan and save space and weight.
So I tested some Trans / Oil coolers to see what was possible.
I found out that my steering cooler MA4 is supposed to 17,000 BTU at 6 GPM, my trans cooler MA32 is suppose to be 50,000 so about 3 times the cooling capacity. From the testing if I was dropping 4 F degree with the MA4 then X3 = 12 F for my current trans cooler.
Figuring that the trans cooler was probably good for 1000HP and I'm lucky to push 400HP with future mods. A 7 F degree drop with a dual stack cooler gets into acceptable range for a non racer.
So I cleared out the steering cooler and trans cooler and am in the process of dropping in a dual stack / one fan combo to cool trans and steering in a much smaller package.

Reference
irate4x4.com

Trans or steering cooler tech for 2020

Is it ok for the outlet is the reservoir to be lower than the pumps inlet? I have this res of about 2.5x the stock volume I would like to install approximately here on the inner fender edit: survey says no Is that thing baffled? If not I wouldn’t bother. So, sort of? it has baffles on...
irate4x4.com irate4x4.com

Data:
78 F Ambient air for all tests

MA4
VA14-AP7/C-34A 12V 7.5" Spal Brushed
4.5 GPM
138 F IN
134 F OUT
Delta 4

MA4
VA109-ABL321P/N-109A/SH 12V 10" Spal Brushless
4.5 GPM
144 F IN
138 F OUT
Delta 6

AMAZON DERALLE 19 Row Knock Off
VA109-ABL321P/N-109A/SH 12V 10" Spal Brushless
3.18 GPM
151 F IN
150 F OUT
Delta 1

DERALLE 9000 21 Row 13615
VA109-ABL321P/N-109A/SH 12V 10" Spal Brushless
3.65 GPM
141 F IN
131 F OUT
Delta 10

DUAL Stack / 2 Cores thickness DERALLE 9000 21 Row 13615
VA109-ABL321P/N-109A/SH 12V 10" Spal Brushless
3.65 GPM
146 F IN First core to cold air
139 F OUT First core to cold air
Delta 7
 
HYDRODYNAMIC said:
Adds some protection from rocks or beer cans being thrown when broken down and plugging the trail.
Click to expand...

And keep the inevitable pairs of panties thrown at it later from melting to the cooler:flipoff2:


Is it just nice and dry in your shop, or do you put something on raw metal to keep it from rusting while you're building? Seriously, that's looking super clean:smokin:
 
desertPOS said:
Is it just nice and dry in your shop, or do you put something on raw metal to keep it from rusting while you're building? Seriously, that's looking super clean:smokin:
Click to expand...
I put on some water based rust inhibitor spray and it works well if you don’t sweat on it. Needs more.
I ran out and Amazon doesn’t carry it anymore.
It smells like radiator fluid so I’m guessing it’s propylene glycol, not regular ethylene glycol, I picked up some environmental safe radiator fluid which is propylene glycol and am going to try it.

EDIT: It works, no rust since application and was sweating all over the frame and sprayed it down and no rust.
 
Last edited:
FRONT coil specs for front: 1:1 ratio
Planning on 900 per corner, actual weight is 1524 LBS Sprung Front

REAR coil calcs came in at 9.75" of a 16" x 250 # coil.
So 16" - 9.75" = 6.25" X 250 # = 1562LBS + 520LBS to be added= 2082LBS /2 = 1040LBS per corner rear

Coil specs for rear: 1: -.58 ratio
1.4375 shock travel is 2.5" wheel travel static .57 ratio
3.125 shock travel is 5.5" wheel travel static .57 ratio
8.625 shock travel is 15.625 of axle travel static .55 ratio
9.375 shock travel is 17.25 axle travel dynamic .54 ratio
1040 lbs per rear corner is 1826 lbs at the shock
The shock has .875 travel left went at full air bump

CALC
Single 300X18= 6" comp -18" =12" coil height, 7.2 block, 10.8 travel
1" /300lbs preload
3.25" comp = 1.9" comp travel + 1.4" air bump
At the wheel 5.7" comp = 3.2" comp travel + 2.5" air bump comp

ACTUAL Minus - Gear and Fluids
Single 300X10= 6.125" comp -10" = 3.875" coil height, note spring is shorter for test 10"
.75" /225lbs preload
At the wheel 5.5" comp = 3" comp travel + 2.5" air bump comp

So planning on a 300# x 18" or 20" coil for the rear.



IMG_4381.JPG

IMG_4382.JPG

-
 
Last edited:
Your front spring numbers look really high to me.
 
HYDRODYNAMIC said:
Front springs showed 750LBS per corner, scale showed 762LBS per corner.
I added 150LBS per corner for passenger, fluids, skid plates.
Gets back to the 900LBS per corner.
Click to expand...
was the front and rear at ride height at the same time when you did you measurements?

shooting from the hip id expect a 150/250
 
Is the method you used to weigh the rig very accurate? Wouldn’t the numbers be skewed by distance of hoist anchor point to axle axis? Height of anchor point above axle C/L Height of lift? Etc?
 
mobil1syn said:
was the front and rear at ride height at the same time when you did you measurements?

shooting from the hip id expect a 150/250
Click to expand...
shit, my rig (admitedly a smidge lighter), is 150/150 or something similar.
HYDRODYNAMIC you should finish it completely then get the springs. Not calculate them.
 
IMG_9502.jpeg

For perspective and not as advice, race day, 5,123 lbs 55% bias

Front 200/250 14”/16” (per Girardo Iribe as last minute bandaid)
Rear 150/200 14”/16”


New chassis is lighter(4,400lbs) and sitting at
Front 185/250 <—- may go lighter on secondary but haven’t tuned yet.
Rear 150/175


Beg, borrow or steal some springs and follow the method for nailing the exact rate rather than listen to fake internet friends
 
Looks like I am stuck running a 20" x 300# coil on the rear 10" coilover. Dual 10" that heavy are not common. This spring is only offered in 3.75" ID for 3" shocks, I have a 2.5" shock. I know someone makes an adapter/spacer/washer/bushing that converts 3" ID to 3.75". Who make it?
Ideally I keep my upper and lower FOX spring perches/cups so I don't have to tear the shock apart.
 
damn train drivers over complicating things, something is a miss because my calculations say you need a 200# combined rate in the front which is insane. FYI - 400/400 is a 200 combined rate

shock length - shock shaft showing at ride height = shock travel
shock travel + preload = spring travel
sprung rate / spring travel = desired combined rate
look at spring rate chart and pick a combo that is near combined rate with a 100-150in/lb split

HYDRODYNAMIC said:
#1 ACTUAL Minus - Gear and Fluids
Single 250X16= 7.25" comp
Click to expand...

1812.5 lbs sprung weight

HYDRODYNAMIC said:
#2 ACTUAL Minus - Gear and Fluids
Single 300X10= 6.125"
Click to expand...

1837.5 lbs sprung weight
 
mobil1syn said:
damn train drivers over complicating things, something is a miss because my calculations say you need a 200# combined rate in the front which is insane. FYI - 400/400 is a 200 combined rate

shock length - shock shaft showing at ride height = shock travel
shock travel + preload = spring travel
sprung rate / spring travel = desired combined rate
look at spring rate chart and pick a combo that is near combined rate with a 100-150in/lb split



1812.5 lbs sprung weight



1837.5 lbs sprung weight
Click to expand...
You might be mixing front with rear.
Rear is on a trailing arm. Air bump and shock bump at the same time.
Front is weird. The air bump bottoms out first leaving some shock shaft showing if axle is parallel. At full flex the shock bottoms out as the axle swings around the compressed air bump.
 
HYDRODYNAMIC said:
Front is weird. The air bump bottoms out first leaving some shock shaft showing if axle is parallel. At full flex the shock bottoms out as the axle swings around the compressed air bump.
Click to expand...
Doesn't matter for spring calc
 
Are you saying 8" total spring compression (including 2" of preload) from full droop to ride height? That would mean 6" of shaft in the body with 2" preload. Which is an odd droop ratio on a 14" shock so I think that caused confusion. Along with all of the other useless numbers :lmao:. That's a 113 lb/in combined rate so your 200/250 would be correct. But I think you will find this rides like a sack of bricks. If you are stuck on that droop ratio I would consider a lower rate and more preload.
 
You must log in or register to reply here.
Top Back Refresh