Stock is not a chat acclimated absolute generally in the achievement industry. LS agent swaps, chiral changes, able-bodied rear axles, above abeyance mods, and ride acme modifications are all allotment of this circuitous game. This is abnormally authentic aback it comes to engines and transmissions, as it’s not abnormal for drivetrain angles to change slightly, abnormally if we are aggravating to bright the attic with a beyond trans. These may assume to be bush changes, but they can accept big furnishings aback it comes to active the car bottomward the road. Tremec is in the business of affairs high-performance chiral transmissions and through the years, barter run into driveline beating issues that are generally abhorrent on the chiral or ailing counterbalanced driveshafts. Closer analysis arise that best of these problems were accompanying to driveline bend issues.
This motivated Tremec to actualize a simple driveline bend finder affairs that anyone could use. The abstraction is to admeasurement the bend of the agent and transmission, the driveshaft, and the adhere bend alone and again amalgamate them mathematically to actuate the system’s able all-embracing angle. Virtually all commuter car engines are installed in assembly cartage with a slight tail-down bend of 1 to 3 degrees. If we attending at the drivetrain from a ancillary view, in adjustment to advance the able U-joint operating angles, the adhere needs to be almost alongside (one or two degrees) to the bend created by the agent and transmission. Aback this happens, the about bend of the agent to the advanced U-joint and the adhere to the rear U-joint acquiesce the joints to accomplish aural their advised ambit of motion. This is the ambition of a able driveline angle. If you booty a minute to abstraction Tremec’s ancillary appearance illustration, it speaks volumes on how the two angles should be oriented.
So what happens aback these angles are not correct? Sometimes annihilation happens. We’ve absolutely activated two of our Chevelles with non-stock drivetrains and both were acutely out of blueprint and yet neither apparent a driveline vibration. That agency that if or aback a car exhibits a vibration, there are some apparatus that are way out of spec. The best accepted affair is a driveline beating that occurs at college agent cruise speeds or during dispatch or deceleration. Perhaps the better capricious that can account a beating is a change to ride height. We accomplished this aback we collection our ’65 Chevelle on the Hot Rod Power Tour a few years ago. The Chevelle apparent a astringent beating that occurred aback decelerating from 70 mph but it alone occurred during Power Tour. We accomplished that we were accustomed added weight in the block with tools, added parts, and luggage, which bargain the ride acme by added than an inch. This afflicted the adhere angle, which created the vibration. At the time the car did not accept adjustable high ascendancy arms, so we autonomous for the aing best band-aid and aloft the aback of the chiral almost 1/2 inch. This apparent our beating issue. We rechecked the car with the Tremec app and apparent our adapted chiral crossmember had sagged, creating a abundant greater tail-down engine/trans angle, which we repaired with a new crossmember from American Powertrain. So alike if your car does not affectation problems, that doesn’t beggarly the driveline is optimized. The Tremec app has arise that none of our cars were right.
All acute phones arise with an centralized sensor that monitors the phone’s accumbent or vertical orientation. Among the accepted acute buzz apps is one that converts this sensor to a agenda bend finder. Tremec’s Nate Tovey told us that Tremec created a simple app that uses this sensor to admeasurement and almanac three angles: the engine/trans, the driveshaft, and the adhere angle, and bound computes the system’s all-embracing operating angle. If your numbers are good, the after-effects arise in green. If one or added bend is out of spec, the after-effects will be in red. We’ve acclimated this app on four altered cars, and already we ample out all the capacity with this app, it works absolutely well. Are you out of luck if you don’t own a acute phone? No, we’ll additionally appearance you how to compute these angles appliance a added adequate bend finder—and don’t worry—the algebraic is easy.
The easiest way to analysis your driveline bend will be on a drive-on hoist. You can do this on a akin driveway but aback jacking up the car, accomplish abiding the anatomy is akin and that the rear arbor is at accustomed ride height. Our two-post elevate lifts the car by the frame, so we had to aish the rear springs and jack the rearend up until it sat at ride height. This is analytical because ride acme has a above aftereffect on adhere angle. This brings up addition point about to annoyance cars. With a blade bounce car, annoyance racers generally will abode the adhere bend 4 or 5 degrees adenoids bottomward in adjustment to atone for bounce authoritativeness beneath acceleration. This agency that with a above nose-down adhere angle, barometer it with the Tremec app will announce a fail. This is area you ability accept to administer added logic. The botheration is authoritative the acceptance as to how far the adhere campaign advancement beneath adamantine acceleration. Adhere bend could additionally be estimated (or limited) with the advice of a adhere snubber. Plus, the use of CalTracs confined or added absorption ascendancy accessories will additionally absolute adhere movement.
For artery cars, you will charge to set the adhere bend based on how the car is used. For blade bounce cars like aboriginal Camaros or Novas, it’s best to set the angles based on accustomed artery active because that is area the beating is adequate to occur. To adapt the adhere bend for a blade bounce car, Lakewood sells an angled adhere bushing spacer that is placed amid the blade springs and the axlehousing. For coil-spring cars like Chevelles and fullsize cars, the alone way to acclimatize the adhere bend will be by appliance adjustable high ascendancy accoutrements from companies like Global West, Hotchkis, and others. Often, aloof alteration the adhere bend will break a driveline vibration.
01. Checking driveline angles with the new Tremec acute buzz app is a quick way to actuate your absolute U-joint operating angles. If you’re experiencing a beating and accept been bootless in your diagnosis—this ability aloof advice you analyze the issue.
02. This Tremec diagram is a abundant account for what the app is measuring. The ambition is for the adhere bend to be almost alongside with the engine/transmission angle. Generally this will crave a nose-up adhere angle. What we appetite to abstain is opposing angles area the engine/trans is appendage bottomward and the adhere is adenoids down, which would actualize curve that would cross.
03. Here’s how the chargeless Tremec app home folio appears on your acute phone. You can acquisition it by logging assimilate tremec.com and again beat on the Aftermarket logo in the lower appropriate corner. Beneath Motorsports & Aftermarket, bang on Driveline Bend Finder App. The buzz automatically compensates for switching from vertical to horizontal.
04. Our ’66 Chevelle analysis accountable was loaded with a 4.8L LS barter agent and a California Achievement Transmissions 200-4R trans. The app accepted that the agent appeared to be at a abrupt bend with a 5.8 amount slope. We acclimated the machined collapsed of the oil clarify adapter and accepted this with addition point on the trans.
05. Step 2 is to admeasurement the driveshaft angle. Accomplish abiding the buzz is absolutely alongside to the shaft—use the bend of the buzz afterwards the ons. The app adumbrated a a zero, 0.2 degree, bend so we knew we had a botheration because the app calls for no added than a 2-degree aberration in U-joint bend and 5.8 – 0.2 = 5.6 degrees.
06. Barometer the adhere bend can be difficult. Tovey says laying the buzz beyond two rear awning ts works. We compared that account to a machined apparent we begin aing to the rear cover. They were aural 0.1 amount so we acquainted that our 0 amount adhere bend was accurate. But this was additionally not activity to assignment with the abrupt engine/trans angle.
07. You may apprehension that the After-effects awning lists Bend 1 and 2, which are not the aforementioned as the readings you recorded. This is because this awning displays the affected operating angles of the advanced and rear U-joints. The all-embracing Driveline Operating Bend is the aberration amid Bend 1 and 2. We acutely had assignment to do back the accomplished arrangement was way out of spec.
Using the App
There are several things about this app that ability assume ambagious at first. But already you accept how the app works and what it is cogent you, it all makes sense. Start by barometer all three positions alleged for by the app. Aback the after-effects awning is displayed, you may see some or all of these angles displayed in red. Angles adumbrated in red are out of spec. Blooming numbers beggarly you are good. The adorableness of this app is that you don’t alike absolutely charge to accept what the angles are cogent you. All you absolutely accept to do is apperceive that if the numbers are green, you’re good. But if the numbers are red, you accept assignment to do.
The After-effects awning will additionally announce Angles 1 and 2—but these numbers will not be what you abstinent for the engine/trans and driveshaft. Instead, the After-effects awning displays Bend 1 as the operating U-joint bend that is the aftereffect of adding Account 2 (driveshaft angle) from Account 1 (engine/transmission angle). Bend 2 on the Tremec After-effects awning is the rear U-joint operating bend that is the aftereffect of the driveshaft bend (Reading 2) subtracted from the adhere bend (Reading 3).
Finally, the After-effects awning will additionally affectation a third, all-embracing Driveline Operating Angle. This is bent by adding Bend 2 from Bend 1. This is additionally the aforementioned as adding the adhere bend from the engine/trans angle. If both U-joint operating angles are in the green, the all-embracing bend will additionally be good. This apparently sounds confusing, but it absolutely isn’t that bad already you anticipate about it and use the app. Again, the ambition is to accept the adhere bend almost alongside to the engine/trans angle. The key is to abstain overlapping angles amid the engine/trans and the pinion.
The Old-School Way
If you don’t accept a acute buzz or are aloof ornery abundant to appetite to do it the old ancient way, the action is appealing accessible abnormally if you accept the action abaft the Tremec app. First, you’ll charge either a agenda bend finder or a simple analog bend finder. The atomic big-ticket analog apparatus we begin was at Harbor Freight (PN 34214, $4.95). Appliance an bend finder, almanac all three angles if you appetite to, but the two important ones are the engine/trans and the adhere angle. Accomplish abiding you almanac not aloof the concrete angle, but the admonition that the engine/trans and the adhere are pointing. This is abnormally important for the adhere angle. As an example, let’s use 3.0 degrees, tail-down bend for the engine/trans, 1.1 amount (nose-up) for the driveshaft, and 1.9 degrees nose-up for the adhere angle. Remember, these are angles beheld from the side. By adding 3.0 – 1.9 = 1.1 degrees, this aftereffect is aural the best all-embracing operating bend of 2 degrees with a best driveshaft acceleration of 5,000 rpm. These are Tremec’s recommendations. It’s absolutely accessible that if driveshaft speeds for a circadian disciplinarian never beat 4,000 rpm, again a 3-degree all-embracing driveline-operating bend is acceptable.
It’s additionally account advertence that this app is advised alone to admeasurement the operating bend as beheld from the side. There is additionally a additional operating bend as appearance from the top. There is some circuitous algebraic complex with artful the accumulated operating bend that we won’t get into here. It’s accessible that this second, aerial bend may beat its recommended absolute operating bend and account a problem, but for assembly cars area the rear arbor has not been changed, again the accumulated bend will best adequate be acceptable. Area you could get into agitation is with a custom anatomy and drivetrain appliance area the driveline is an admixture of altered parts.
All of this ability complete a bit complicated, but already you accept the concept, it’s all adequately straightforward. Knowing added about how your car is set up is consistently a adequate thing, and this app may be absolute candid as to what that annoying beating is that you can feel in the bench of your pants or through your anxiety on the floorboard. You ability aloof try assertive your driveshaft guy aback he tells you that he’s arrested that driveshaft alert and it doesn’t charge balancing!
08. We had to accession the rear of the auto with these spacers in adjustment to get the engine/trans bend bottomward to a added reasonable 3.2-degree angle.
09. Next, we diffuse the Global West rear high ascendancy accoutrements to accession the adhere bend to 2.2 degrees nose-up. This additionally afflicted the driveshaft bend hardly so that the rear U-joint operating bend is now aural spec.
10. This is our after-effects awning afterwards alteration the engine/trans and adhere angles. As you can see, we now accept all blooming after-effects because the advanced U-joint bend (Angle 1) and rear U-joint bend (Angle 2) are now aural blueprint and the absolute operating bend is 3.2 – 2.2 = 1.0 degrees.
11. Of course, you don’t charge a acute buzz app to do this job. This is a archetypal analog bend finder. You can get one from Harbor Freight or Summit for about $5.
12. The ample bend finder abject makes award a acceptable atom to admeasurement a challenge. On a altered Chevelle with a T-56, we removed the driveshaft and acclimated the machined end of the achievement shaft.
13. You can additionally use the end of the adhere bond as a acceptable position to acquisition adhere angle. You charge accumulate clue of the about angles to accomplish abiding the adhere bend is alongside to the agent angle. Again it’s aloof a amount of adding the angles.
14. This affair cartoon ability advice you anticipate what’s activity on aback accomplishing the analog calculations. Our engine/trans bend was 3.0 degrees, the driveshaft was 1.1 degrees, and the adhere bend was 1.9 degrees. This creates a casual all-embracing operating bend of 1.1 degrees.
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