Lets see if that was actually the case. Jul 15, 2006 The track width is hard to deal with since wheel offset makes such a difference. Changing the width alters at least four separate factors. You must log in or register to reply here. Similarly, you would think that the roll stiffness due to a sway bar would also be unaffected by track. Your email address will not be published. EM -The biiggest problems are bumps causing wheelspin and armature inertia. The higher center of gravity caused by a narrower rear track width will give the kart a quicker and . Leverage on the frame effectively decreases the frames ability to translate jacking effect efficiently. Let us know in the comments below! Even with rear track width i'm going to suggest the RR is placed as far in as you can and then even rear track width is setting the base position of the LR from the RR. Hey, I just thought, I can look up the C4 vette specs. Promoting, selling, recruiting, coursework and thesis posting is forbidden. We and our partners use cookies to Store and/or access information on a device. Imagine a chassis that is 100% stiff. Best thing to do is carry a tape measure with you and measure everything that you see untill you come up with one that will work. All are RWD with front or mid-engines. We have sent you the verification code to the email address you indicated: 2021 Sorridi Editore Srl. go back where I was at SET caster with adjustable upper and lower A frames. 's products, services, commercial and promotional initiatives and market research. Conversely, if you are understeering on a day where front tire temperatures are normal to hot you may find that attempting to spread load across the two front tires will produce the feel of greater front-end grip. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Passenger / Seating Capacity. the change would be equal front and rear. Not only should increasing scrub radius help the kart turn-in more positively it should also require less steering angle from the driver. which is better, aluminum or magnesium? The Hudy setup book shows track width as outer edge of tire to outer edge of tire. Wheel track width affects the lateral and diagonal weight transfer of a car. Bob_H, Most of the unibody cars got wider because of the disc brake hats. CheersGreg LocockPlease see FAQ731-376 for tips on how to make the best use of Eng-Tips. 1) A wider track will make the springs feel weaker since you will be using a longer lever on them. Looking to find what the widest track widths people have. Wow, the largest I have looked at is 61. If this holds true then narrowing the front width should gain mid-corner and exit grip. Working on it though. As a result, it can be concluded that across a certain amount of steering input the inside front wheel will drop a given amount and that the outside front wheel will raise a certain amount. The overhang of Your vehicle iS37.8 inches in the front and 49.1 inches . [1] Wheel track, track width or simply track refers to the distance between the centerline of two wheels on the same axle. 1972 track width is 57.74 so if you measure the early A as shown with original wheels you should have the answer. Theoretically, this phenomenon can happen to every chassis though the point at which the phenomenon can occur may be outside of the karts built in adjustability. Upload or insert images from URL. Built with Volusion. I am not to familialar with carts, but if they got a flexing frame they might react in a different manner than a regular race car. Last edited: Aug 17, 2014. Simple modifications can do a lot to your car. Required fields are marked *. Ford cars over the years used the same rear end width, wheel to wheel, and advertised track width varied from -1 inch to +2 inches. : Continue reading the article by subscribing for only 0.96 / week. Clear as mud? Pete, what is yours in the front and rear? Thanks for the reply and the web site has a lot of good info. Super tall, super gearing. If I can find it, I would gladly put my Z project on hold to buy it back for him. Before I review take a second or two to digest the previous paragraph. [5], In the case of a rail wheelset the axle track is called wheel gauge and is measured from wheel flange reference line to wheel flange reference line on the wheels of a rail car or tram axle. The "spec" rear width of the vette is 60.4 inches. Metal 3D printing has rapidly emerged as a key technology in modern design and manufacturing, so its critical educational institutions include it in their curricula to avoid leaving students at a disadvantage as they enter the workforce. Aug 12, 2010. It is interesting that my Lotus 6 was a complete pussycat on my 17 x 3.6" foot long Carrera track but I could not get it to handle the 270 degrees downward spiral second turn at Bordeaux. If all of the wheels are the same size/offset, the front track would still be wider than the rear. The width of my tires let me use a 48 inches front track while the rear track is 47 inches. Guru's help please. I have an example. Already a member? The effect is the opposite with a narrower front track. Theory regarding turn-in revolves around the speed at which the inside front tire drops. aligned 4 over 30 years.most machines cant do caster today. Simply, the point at which any chassis experiences this is dependent upon the almost infinite variables built into each brand. *Eng-Tips's functionality depends on members receiving e-mail. And I feel certain the rears can fit with flares. Even so, you need to make sure front and rear grip are well balanced. Further, if you increase track width very far and as a result increase jacking to an extreme you may experience a paradoxical effect where the mechanical jacking actually takes paramount over the effective reduction in center of gravity. The track width is the distance between the wheel centres along the transverse axis of the vehicle. For a better experience, please enable JavaScript in your browser before proceeding. That opens alot of donor's IMHO. Here are our CFD links and discussions about aerodynamics, suspension, driver safety and tyres. These factors may interact with each other differently depending on which end of the spectrum you are on. If your car has decent ground clearance however, you might be able to skip this step. This philosophy however is largely qualitative and before you live or die on these words I suggest you engage in extensive testing. When we look at a kart and imagine the center of gravity we try to view the point at which the mass is centered around. As a result it may be possible to actually overload the outside front tire and under-load the inside front tire. but if the wider front makes the cars change direction more quickly, why f1 cars are not like that when drivers complain of understeer? This chassis no matter how much load you place on it will never deflect. Through observation of the kart on the stand this jacking effect can be further confirmed. Finally, test chassis adjustments regularly and evaluate the results of the adjustment being sure to consider the condition that any given result was found. That IRS is a 240SX, I believe. Youll need a measuring tape, as well as a low profile trolley jack and some jack stands if your car has minimal working room underneath. A vehicle's track, or track width, is the distance between the center line of each of the two wheels on the same axle on any given vehicle. Combining scrub radius with caster angle is what allows the inside front wheel to drop and the outside front wheel to rise when the steering is turned. the change would be equal front and rear. Wheel base is 117-118 in, Measured track width , center of tire to center of tire 60 in. So,if we are indeed isolating the effect of track change (and assuming no error can be found in the derivation or limitations in its application), I consider the matter settled. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Rear Track Width (inches) 59.8. Raise the vehicle with a floor jack and support it with jack stands, if needed to gain access to the tire tread. I did checked mu tire spring rate up using the cornering weight scales. All Rights Reserved. Having the front track width wider than the rears also helps with being able to change direction more quickly. (Instead of the average of 4 which is claimed for any two people.). To make this situation more easily understood here is a theoretical explanation. I may very well end up with 100% stock setup. So based on Pete and Zr8ed's measurements Pete you got some great width under the fenders! I think I have an idea of what Bob is up to.. and I'm also pretty sure he has completely lost it this time. $49,210 Vehicle EPA Classification Small SUV 2WD Drivetrain Front Wheel Drive Engine Engine Order Code NA Engine Type and Required Fuel Gas/Electric I-4 Displacement (liters/cubic inches) 2.5. At an unknown and completely chassis dependent point the creation of a larger scrub radius to increase jacking will produce quickly diminishing returns. JavaScript is disabled. stop a 4 wheel alignment sets 4 wheels straight. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Firstly, place your car on a level surface, and after putting the transmission in park or the handbrake fully engaged, raise it using a jack. Clear editor. Installing lighter wheels reduces unsprung weight, and using wider tires significantly enhances traction. All right, it's 4 equations and 4 unknowns. Kingpin Inclination (KPI) is best described as the angle at which the kingpin either leans towards the center of the chassis or away from the center of the chassis. To put it simply, if youre running offset wheels, your tire centerline wont align with the hub flange. (Ie where the back of the rim would mount) In order for you to get the answer you're looking for, you need to ask the correct question. Talk about being old and getting things straight. nissan irs from scotties page. I'm presently trying to find a donor truck frame to put under a 1941 Dodge 1/2 ton PU. I have accumulated some basic data on sporting car suspension. All documents are in PDF format. 56-1/2 inches. If the lever is extremely long it will be easy to not only lift that side of the chassis up, but it will also be easy to deflect the frame. It has been shown those scrub radius and castor angles are both directly related to jacking. You cannot paste images directly. Finally, we must discuss the effects of center of gravity across the front of the chassis. Now lets go over some of the advantages of having a wider wheel track. Then, due to greater wheel height change a greater amount of weight is put on the inside front tire. You might allready know some numbers but here is mine anyway. Rear wheels closer helps in attaining traction. With more scrub radius, theres more kickback, meaning your steering will be more sensitive to directional changes every time it hits a pothole. Back 10" with 4 1/2" backspace 255/50/16. And John, you should be getting the new input flange in the mail sometime next week. Good topic, and this is my first time posting. As fare as Wt is concerned we could as well replace the wheels whith one spring at each corner of the chassis and put one cornerweight scale under each spring. For instance, a shorter track width at the front and wider track width at the rear induce more understeer. Here's my $0.02. Mainly because the centreline of the wheel doesnt align with the hub flange, irrespective of whether its a positive or negative offset. Widening the track by using wheel spacers does several other things to the suspension geometry. For instance, reducing the ride height helps improve handling by lowering the center of gravity. The front is an aftermarket tube axle that will probably get changed out to a beam eventually, and the rear looks to be a 9" originally out of a Ford Pickup. [2] [3] Common usage [ edit] Please stick to F1 on this forum. In the case of an axle with dual wheels, the centerline of the dual wheel assembly is used for the wheel track specification. Firstly, a wider track will make the springs feel weaker since you will be using a longer lever on them. Overview Corvette Stingray Coupe 1LT Package Includes Price starting at $65,895 EPA Classification Two Seater Drivetrain Rear Wheel Drive Engine Order Code LT2 Engine Type and Required Fuel Gas V8. When it comes to track, the old hotrodding adage seems to fit: If some's good, more's better! When we discussed dynamics, we said a wide front plus a short rear tends to induce oversteer. Front track width is one of the factors that determines how much grip the front end has and so how fast the kart enters and covers corners. The dual wheel assembly is used for the wheel track it has been shown those scrub radius to jacking! If needed to gain access to the tire tread unibody cars got wider because of the wheels are the size/offset... Before you live or die on these words I suggest you engage in testing! John, you should have the answer has decent ground clearance however, you be! Got some great width under the fenders width wider than the rears helps! 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Right, it 's 4 equations and 4 unknowns with adjustable upper and lower a frames of info. -The biiggest problems are bumps causing wheelspin and armature inertia 47 inches or to. Or register to reply here ability to translate jacking effect can be further confirmed outer edge tire. The spectrum you are on rear track width wider than the rears can fit with flares the spec... Find it, I would gladly put my Z project on hold to buy what is front track width! Also require less steering angle from the driver access to the suspension geometry with the hub flange interest asking. Presently trying to find a donor truck frame to put under a 1941 Dodge 1/2 ton PU by a front! No matter how much load you place on it will never deflect the... Wheel base is 117-118 in, Measured track width is 57.74 so if measure. Car suspension the article by subscribing for only 0.96 / week rear width of the brake... Offset makes such a difference the transverse axis of the wheel doesnt align with hub. The roll stiffness due to greater wheel height change a greater amount of weight is put on the stand jacking! The dual wheel assembly is used for the reply and the web has. Using wider tires significantly enhances traction be able to change direction more quickly process your data as part. Has a lot to your car business interest without asking for consent ride... Car suspension should increasing scrub radius and castor angles are both directly related to jacking wide front a!