Weight Bias: It’s not what you think anymore! Tech Tip Tuesday

[@Dwarfracer88]

Roll centers and polar moment of inertia. The lower the weight is the harder it is for the tires to lift it, causing the tire to press down into the track to move that weight. The closer the weight is to theoretical center of mass of the car the easier it is to change that theoretical center of mass with suspension adjustments. That way you can adjust the car without actually having to physically move weight.

[@corbanlee8157]

Was thinking of leroy with the turbo placement 🤣😂

[@buzz4633]

Yup, and along comes Mullet. I'm curious where Kevin will put the turbos now.

[@TheOlsonOutfit]

@@buzz4633 don't look ;-)

[@buzz4633]

@@TheOlsonOutfit Too late! 🤣

[@2blkSSs]

I was thinking of James talking to kyle about it haha

[@lsg_mk7r352]

@@2blkSSs Yeah Kyle needs to watch this video. Because he's moving things around on the MR2 and one of the things that he's moving is the radiator from the front of the MR2 to the back

[@lazyhoundracing9621]

I'm doing a new build now and weight is important to me. Thanks for your insight on the subject. I watched the wind tunnel video and was amazed at the lift in the front at speed.

[@williammartino952]

So glad I came across this vid, was planning on more weight in the back!! I would have never thought to think all this!!

[@kene6838]

Great explanation , sled pullers are a good example of weight placed on a chassis used for leverage.

[@jonferron3053]

Slowly but surely becoming my favorite Channel with all the great information each and every video or showing me something new and grabbing my attention great job

[@zukobringas5096]

Was actually thinking the same way...more weight upfront so it could nicely transfer to rear wheels at launch instead of it being already at the rear which will transfer to nowhere. Your experience has confirmed that theory, thanks for the great info.

[@joecameron3406]

Always look forward to tech Tuesday balancing an S10 is going to be fun especially small tire thanks once again

[@68nomad]

This is great to know. Was planing on move my radiator to behind the cab to make room and move one weight. Might have to reconsider this. Thanks

[@colterdraper1061]

I have a rear mount radiator set up. It's a street car. I did it for room and access in the engine bay.

[@jasonwells2988]

Great video. Thanks for your time

[@drivinwithdrew7676]

Pretty good Info here, I love videos on suspension, making power is easy, making the car consistent is the hard part

[@brandonpanozzo86]

oh shit real useful tech thank you Doug

[@darrelowens]

I had an 81 Big Block Pro Street Chevy Truck which was Yellow and blue. I called mine the Nuclear Banana.

[@joewest531]

This is definitely good info for radial tire set ups I would think closer to 50/50 would be better for big tire set ups though

[@dennykatz157]

Great info! Keep up the great work!

[@brianwiniarski4490]

Great video thanks for posting!

[@boostlife7984]

It depends on what you are doing with the car though. I run 160-300 pounds in the bed of my car because I put my car on the street and not the track. Plus I know a guy who has a blazer and runs 400 pounds on a real no prep and whoops up on everyone

[@rizin2213]

I see a wheelie bar being installed on my K24 swapped 2005 Lotus and a weight plate mounted up front. Already looking at putting the battery up front.

[@grayscustomautogca3017]

Awesome info Doug! Light bulb just went off! Radiator is staying in its original home!!

[@v8tergt653]

A tech tip Tuesday idea would be explaining how to size a turbo correctly

[@timothygoodsell1446]

Great tip but what about truck builds, naturally light rears. And tips for drag trucks would be much appreciated. Thanks for all u guys do to help novices like me💪

[@RealSteelStreet]

Trucks work too, trust me! I’ve got an all stock type suspension and stock weight + 95 C1500 with a 496ci bbc (with AC even) on Pro 275s that weighs 4160lbs with a little over 60% of that weight on the nose. With 2500lbs out front and only 1660lbs on the rear axle I’m STILL having trouble keeping the front end tied down, and that’s N/A…much less once I install the power adder it was built for 🤦🏻‍♂️ Mono-leafs with CalTracs, good springs, and a decent set of shocks work wonders cuz once it finally hooked, by God it HOOKED 😳 Always thought I’d be fighting traction issues vs lifting issues yet here I am anyway 🤷🏻‍♂️

[@timothygoodsell1446]

Sounds bad ass!

[@lindsaymcpherson4744]

Great video guys straight to the point without making a maths lesson out of it !! Wicked !!

[@JohnRoberts71]

Great content thanks for sharing

[@centermass4962]

Solid info. Love that nova btw man.

[@jonhill9564]

Such a tease! After watching I went looking for Blazer videos. Where you hiding them...coming soon I hope?

[@Julian-eb9ze]

Same here I been looking for them too

[@yolofullsend]

That nova did the perfect wheelie tho 😍

[@ziggassedup]

That's what I thought.

[@danmyers9372]

It was right on the edge. Any more power on the hit and it’s going to the moon with damage when it comes down. While power wheelies like this look cool it actually slows the car down. A portion of the energy is propelling the car up vs forward.

[@davidciesielski8251]

a very cool, smart dude!! Thanks

[@Anarchy-Is-Liberty]

Yep!! We ain't livin' in the '50's, '60's and '70's anymore, welcome to new tech and the 21st century!!

[@phillipragsdale3382]

Makes total sense to me in high powered vehicle

[@jimgaugler7703]

Well done young man

[@TheBillykurtz]

MRW: mounting turbos up high is bad Cletus: Can't hear you over all these bald eagles!!!

[@raymondguzman1907]

Good video thank you for all your information. What do you recommend for the oil return side of the turbos if there mounted below or level to the oil pan oil level? I figure it would be a problem. Do you all have some kind of pump to aid that in a set up like that or is there something else that can be done. About to get to that point on my build and would like to just do it once. Thanks in advance

[@merctech1979]

There needs to be a truck tip Tuesday

[@ronmonahan1696]

doug how about a video on converting to manual brakes? master cylinder bore size and effects on pedal feel and such. thinking about converting but this is true street car and dont want to have to use two feet to stop the car at every stop sign,lol.

[@pappatimvw]

Hi awesome info, I’m interested in a leaf spring car with caltracs. Do you have any pointers on installing these on a station wagon?

[@billbraski2175]

Ryan Mitchell puts l around 600 lb in his trunk. And he's one of the fastest guys on no prep so I think there might be a point in putting a lot of weight back there

[@stevekinney729]

Hey Doug check this out I just wrecked my 2000 mustang so I'm thinking do a tube front end on a new edge yes I know there's videos on the fox but explain more for a new edge and also I'd like to see a drag spoiler for a new edge also

[@danmyers9372]

This thinking is correct for well prepped surfaces but not for the really popular super slick, rough asphalt small tire no prep racing. These cars are all adding hundreds of pounds of weight as far back as possible.

[@kenmaylin4744]

So, with this said, what's a good starting point weight bias for a new build?

[@warrencwwatts3994]

Excellent Video.

[@robertdouglas3456]

Nice video young man! 🤩🤩

[@cujo3414]

Cleetus.... hold my bartle skeet!

[@lynnjr.1842]

So, that whole, Hilo/High Low setup isn’t necessarily what’s best for the car?

[@georgebarton6098]

Nice video guys.....

[@iVitalzHD]

What about a irs suspension video? Making a fast modern stock style suspension car not just something with a 4 link?

[@MotionRaceworksOfficial]

This car is leaf spring sir :) but we have Andy’s gto about done and ready to start testing. That’s a great idea and we will make sure to document it!

[@iVitalzHD]

@@MotionRaceworksOfficial I forgot this is a leaf spring car lol. But yeah that would be great. Trying to workout the details on gto now. It’s be nice to see what you guys do!

[@cocostacoyalgomas6803]

Blessings brother

[@michaelspangler2761]

The scary canary blazer

[@randyhatfield9612]

so what is the part number on the heater delete panel you guys have on that blazer i would love to get one

[@janhugo]

And Kyle at Boosted Boiz with his radiator back in his MR2.

[@tomlompa6598]

Pretty sure his radiator is in the front dude. What's in and under the back is the intercooler for the turbos.

[@janhugo]

@@tomlompa6598 Yes I know! But the intercooler add some weight to! How many pounds do you thinks it is weighing? Wouldn`t it be better to transfer that weight in the front?

[@JohnClutch1]

I see a pass in 2 segments. Hook and Acceleration. The whole purpose of a suspension is to temporarily transfer weight to the rear so the car hooks. After the tire hooks, it needs to accelerate. And If you add weight to the rear, the tire won't accelerate to its full potential, which explains why you're slow AF 😂

[@Jvcomet]

Good info.

[@BEYTEK]

so.. i have an IRS car. 800bhp. the no prep track im on hase worse than asphalt traction. you cant put down a 150bhp launch...... So what im getting from your video is put the weight in the back? my car never has or never will wheelie. dosnt make the power.

[@grahamerosewarne6656]

Well done love the tech tips 👋👌🤞🤟🤘👎🤜

[@-g-lock813]

doug OK ANSWER THIS what do u think on onboard co2-? is that the future?

[@chuxshed587]

Do you think weight bias should change with a lighter car?

[@slows102]

I have a 2nd gen s10 I'm building. Did you guys make that rad support? I'd like to have something like that

[@jaredthomas6808]

How do I make money building cars? I want to do what I love for a living.

[@lsxtuner6126]

I may have missed it what results did you end up getting out of the GTO build?

[@HoneyBadgerRy]

"start out with 500hp NA applications" cries in my engine swapped then turboed the originally NA engine just to make 340whp.

[@MrGixxer1300r]

Great stuff, new subscriber here

[@leelandspence5661]

First here lol thanks for the info do you guys know any info on front wheel drives??? Have a channel ALMOST YANKEES and we are doing a front wheel drive atm

[@brbntrl2433]

Drag racing you want to be as front heavy as possible. Some SFWD's etc, are at and some over 80% bias in the front.

[@tomlompa6598]

What if the vehicle is all wheel drive?

[@MotionRaceworksOfficial]

It’s probably not going to go very fast if it is. They have a whole different problem set lol

[@thefastforte2854]

​@@MotionRaceworksOfficialelaborate

[@perryg5500]

Is the weight bias different if it has a drag radial or slick?

[@MotionRaceworksOfficial]

No not really

[@danmyers9372]

Weight bias doesn’t matter as much as the instant center and anti squat settings between the two.

[@GrantDolanMusic]

So basically don’t do want my favorite youtubers do. Got it.

[@larrymccandless8723]

I've always thought the 50/50 weight bias was great for road racing but a 55/45 front bias was better for dragging. The lever action around the rear axle being the main reason. If you have too much on the rear of the 'teeter totter' the front won't stay down.

[@comboverracing8175]

How about when you spend $8000.00 on billet Gen 1 94mm Garrett turbos for LDR and then three months later the powers to be change the rules to only 88mm turbos and then a few months later Garrett comes out with Gen 2 turbos and your brand new Gen 1's are worth half the price. What should I do? Sell my Gen 1 94mm's at a huge lose? Buy Gen 2 88mm's for another $8000.00 or more? Or let my car sit in the garage and collect dust an watch everybody racing on utube?

[@jimkaray]

Ouch, that's sounds like a classic bad case of unwanted weight into the rear for sure!

[@danmyers9372]

Sounds like your non turbo competitors whined and cried to get the rules changed cause they couldn’t compete.

[@buiItnotbought]

Holy shit. Chance an on3 maybe?

[@EzeNkeonyere-l4u]

Please sir I love your company sir my hoep is they to work auto motor rper

[@FlynnTaggart23]

Take all of this with a grain of salt or a large serve of glue on the track as is the case is for radial cars that run excusively on a "radial track prepped surface" with the tires literally glued to the track... A Pro-mod chassis generally scales up 50/50 as an example of a high power door car without a front weight bias. No small tire no prep guys who are winning are running 62% weight on the front of the car, to that matter no NPK cars are running 62% on the nose either... NONE. Radial and No prep or No prep small tire are three different beasts and the same set up will not make a good car for any two let alone all three.

[@philb5593]

Inspiration for this video probably came from James and Kyle wrecking their cars with wheelies.

[@MotionRaceworksOfficial]

James 240 actually has like 62 on the nose believe it or not. I think that short wheel base, shock package, and a bar angle are likely in the causes for that. Kyle is a wild man, he’s gonna have a hard time overcoming those wheelies with a rear engine, but that car sure is cool!!!

[@coalstang]

@@MotionRaceworksOfficial thanks for sharing. Man i was 62% on the nose and thought i will never get to a weight bias sweet spot that works. I’m currently swapping to a tube front end and coil overs and light weight front wheels and tires. Light weight brakes.. And a few other tweaks.. all in should be 140lbs lighter on the nose. should be in the 59% on the nose with no ballast anywhere. I was going to chop firewall and move everything back but might try it and see how it does. I need to rethink things. i’m can’t believe the 240 was 62% on the nose. wow.

[@lewisdeclouette6342]

Yes sir

[@RiskIt007]

Stick to selling parts.. back half or street racing is an other world. 45 on the front! Yes..

[@richardturk7162]

Don't put weight in the back then you say don't put weight in the front. ??

[@blueracercam20]

Boosted Boiz's need to watch this video 😂😂😂

[@heavydhit56]

and what move the engine?

[@jcnpresser]

@@heavydhit56 nah, just start racing street and back of track races, forget about the world’s fastest whatever, go out and hurt some big block feelings 😆

[@blueracercam20]

They just need to understand weight balance in general. Their MR2 would be fast as hell, if they understand not only weight balance but also suspension setups.

[@jonhill9564]

Support 🇺🇲

[@tomanycooks]

you're smarter than you look