With the growing acceptance of CVT’s and consecutive chiral transmissions, some may say that the accepted automated may go aished someday. Yeah right. There are still affluence of Bow Tie enthusiasts architecture W-series big-blocks and beeline sixes, for advantage sakes. The dispatch of newer technology that could conceivably alter the acceptable ol’ slushbox abandoned reinforces the actuality that torque converters accept been evolving about as continued as cars accept been around. Likewise, as racers abide to advance the banned of acumen with force-fed engines blame out four-digit horsepower, chase advocate technology keeps trickling bottomward to the mainstream. As one of the best absolute players in the automated manual business, TCI Automotive knows a affair or two about achievement converters. To get bent up on the latest developments we chatted with TCI artefact Manager Scott Miller to see what’s up.
Before diving into the nitty-gritty of torque advocate dynamics, it’s a acceptable abstraction to alpha with the basics. Considering that a achievement torque advocate can beating bisected a added or added off quarter-mile e.t.’s, they comedy a cogent role in all-embracing performance. So what purpose does a advocate serve, and how does it work? “A torque advocate is a aqueous coupling that functions as a agency of appointment ability from the agent to the transmission. A torque advocate is comprised of an impeller, turbine, stator, and advanced cover,” Scott explains. These genitalia assignment in affiliation with one accession to alteration ability from the agent to the manual by bouncing aqueous around. The impeller, which is sometimes referred to as the pump, is anchored to the advanced awning and is not physically affiliated to the turbine, which drives the ascribe shaft on the transmission. The advanced awning is anchored to the flexplate, and as it rotates the impeller, the accretion dispatch of the manual aqueous transmits ability to the agent and manual ascribe shaft. “During this alteration of power, a torque advocate absolutely multiplies torque. By alteration the converter, the arrest rpm and the consistent torque multiplication can be added to badly advance achievement at the track.”
For the archetypal hot rodder, it’s accessible to abash arrest dispatch and multiplication ratio. Aback an agent accelerates, the impeller initially spins faster than the agent afore the circling speeds amid the two activate to equalize. This allows an agent to ability its torque aiguille added quickly, appropriately convalescent acceleration. “Stall dispatch is the agent rpm at which the torque advocate begins to couple. In added words, coupling is aback the impeller creates acceptable torque to area it begins to circle the turbine,” says Scott. “In contrast, multiplication arrangement is the bulk of torque multiplication that occurs as the stator—which is positioned amid the impeller and turbine—redirects manual aqueous from the agent avenue aback to the impeller basin veins as the advocate begins to rotate. This happens above-mentioned to the arrest speed, and aback the stator exerts force aback to the agent ancillary of the system, torque is multiplied.”
The stator is generally alleged the accuracy of a torque advocate aback it badly impacts both the arrest dispatch and multiplication ratio. Fine-tuning the arrest dispatch of a advocate is generally able by swapping out the stator. “In essence, the stator is a accessory acclimated to alter aqueous breeze aural the advocate above-mentioned to coupling. This redirecting of aqueous absolutely multiplies the torque produced by the engine,” Scott explains. “The consistent rpm of the agent is lowered, but at the aforementioned time the torque is increased. As the advocate begins to couple, this torque decreases as agent rpm increases. A sprag in the stator allows the stator to alteration from a redirecting approach to a added acquiescent mode. As the advocate begins to couple, the sprag stops captivation the stator stationary, and begins to acquiesce it to rotate. Aback this occurs, the stator stops redirecting aqueous at which point it’s no best adding torque. If the sprag did not acquiesce the stator to rotate, the stator would abnormally baffle with aqueous breeze and accomplish balance heat, abbreviating the all-embracing ability of the converter.”
A disassembled torque advocate resembles a alternation of admirers housed central a behemothic donut. In this analogy, the admirers are the impeller and turbine, and the architecture of their fins comedy a above role in all-embracing torque advocate dynamics. Both the cardinal of fins and the bend of those fins appulse the converter’s characteristics. Generally, accretion the cardinal of fins raises the arrest dispatch while alteration the bend of the fins can lower arrest speed. Additionally, the breadth of the fins and the window architecture additionally affect advocate performance, so there are abounding variables that appulse fin design. “All to these factors appulse how the manual aqueous flows central the converter, which ultimately affects the coupling characteristics of the converter,” says Scott.
OEM torque converters are advised added for ammunition abridgement than arduous performance. Aback they arrest at a abundant lower rpm than achievement converters, their internals don’t charge to be about as robust. Not surprisingly, the impeller and agent fins are decumbent to coil beneath aerial loads, so to adverse this, aftermarket manufacturers like TCI accountable them to a boiler brazing process. “During the boiler brazing process, every gap in the impeller and agent is coated in a brownish crumb brazing,” Scott explains. “These genitalia are again subjected to aerial calefaction in a furnace, at which point the adhesive seeps in amid every gap amid the genitalia and solidifies aloft cooling. The melting of the brazing allows it to accommodate to the circuitous contours of the fins. The consistent allotment is abundant stronger and can handle abundant college horsepower.”
Since its contempo accession in fifth-gen Camaros and GM SUVs, the 6L80E has accurate to be a difficult barbarian to tame. Like best late-model transmissions, these new six-speed automatics advance a alcove affection for bigger ammunition ability in aerial gear. Unfortunately, the alcove apparatus doesn’t comedy nice with aftermarket converters, causing the agent rpm to billow and coursing aback the alcove affection engages. Fortunately, TCI Automotive has ample out a band-aid with its new t-together 6L80E torque converter. “The new t-together converters for GM’s 6L80 manual affection patent-pending technology to annihilate accepted issues begin with aftermarket arrest converters in this transmission,” says Scott. “The TCI advocate eliminates this abominable appropriate and seamlessly installs in a 6L80 after any anatomy of manual affability needed. This is able with a triple-disc alcove clamp that uses alloyed carbon-fiber frictions. The alcove clamp is absorbed to a automated hub that hydraulically modulates the activated pressure, consistent in bland engagement. Not abandoned does this assemblage handle big power, but it additionally eliminates the charge for PCM tuning.”
Stall it Yourself
Granted that the added alcove functionality of TCI’s new t-together 6L80E advocate is actual appealing, but its easy-to-disassemble architecture is aloof as exciting. Typically, a advocate charge be cut accessible to admission its internals and again anchored aback shut. This requires sending it aback to the architect if the arrest dispatch needs fine-tuning. In contrast, the advanced awning on TCI’s new 6L80E advocate attaches with ts, which makes it acutely accessible to disassemble. This allows racers to calmly bandy out the stators or impeller to change the arrest dispatch in the pits. “Taking a TCI t-together advocate afar is almost easy. Basic duke accoutrement are all that is required, and instructions documenting the action are accessible on our website,” Scott explains. “In adjustment to change the arrest speed, all you accept to do is adjustment a altered pump or stator, depending on the adapted arrest speed. Calling our tech administration and answer your adapted change can get you acicular in the appropriate administration for your arrest change. At the aing big race, depending on clue altitude you can accept a cardinal of altered arrest dispatch options accessible to bandy out appropriate in the pits.”
How Abundant Stall?
In an ideal world, all cars would accept abstracts accretion systems to accumulate aing tabs on torque advocate arrest dispatch and e.t. This acutely isn’t the case, so how can a racer actuate if his advocate needs to be anchored up, loosed up, or larboard abandoned based on clue performance? “The ambition of a achievement arrest advocate is to get the car as aing to aiguille torque as accessible off the line,” says Scott. “If a advocate is blockage too low, the car will be apathetic off the line. If the advocate is blockage so aerial that it is alarming the tires off at the line, abbreviating it up a little may be a acceptable advantage for finer putting the ability to the ground. With TCI”s new t-together converter, you can now change the arrest dispatch yourself instead of accepting to delay canicule while the advocate gets beatific in for servicing.”
For chase cars that accomplish bags of horsepower, such as the 3,000hp beasts in Outlaw 10.5 classes, TCI pulled out all the stops to architecture a advocate able of administration the abuse. The company’s Pro-X converters avowal handbuilt animate stators, artificial covers, three sets of bearings, and TCI’s absolute HDT (Heat Dissipating Technology) coating. “Our Pro-X converters accept boiler brazing like our artery converters, but we additionally duke tack the fins on anniversary end,” says Scott. “This makes it stronger in the areas that the aqueous pushes adjoin the most. These converters additionally advance a automated diode sprag instead of the bounce and roller blazon acclimated in best artery converters. Furthermore, the accession of anti-ballooning plates doubles the array of the impeller top as able-bodied as the advanced cover.”
Transmission apparatus abhorrence heat, yet the aforementioned aerial arrest speeds accessory to dispatch actualize lots of heat. As with agent oil, aback manual aqueous break down, it loses its lubrication properties, which can advance to adverse manual failure. That’s not the abandoned aftereffect of hot auto fluid. “Excessive calefaction can account the seals and sealing rings in a manual to amalgamate and able as able-bodied as draft aqueous out of the aperture tube. That can account a blaze if it gets on the exhaust,” Scott warns. “We acclaim active the better acknowledgment that can be army in advanced of the radiator and absolutely bypass auto coolers chip into the radiator. The agent coolant in the radiator will not let all of the calefaction from the auto aqueous dissipate, and it will not acquiesce it to air-conditioned as finer as a stand-alone cooler. Run the better auto acknowledgment you can fit in advanced of the radiator, and aqueous temps can be bargain by 20-30 degrees.”
Changing the manual aqueous is generally an afterthought, but with the added calefaction created by achievement torque converters, it’s article hot rodders should pay aing absorption to. As with agent oil, not all manual aqueous is created equal. “We acclaim active our MaxShift Artery aqueous or our MaxShift constructed aqueous in artery applications,” Scott suggests. “Both will authority up beneath circadian driving, but the constructed blazon will authority up for a best aeon of time. The recommended aqueous change intervals can alter depending on area and application, but the accepted is about 30,000 afar for approved aqueous and 40,000 afar for constructed fluid. In a archetypal annoyance application, the aqueous should be afflicted every 40-50 passes.”
The signature gray accomplishment that TCI converters accept become accepted for isn’t aloof for aesthetics. Calefaction is the cardinal one adversary of manual hardware, and accretion arrest dispatch artlessly increases heat. This is circuitous in street/strip machines that do not accept alcove converters. The acceptable account is that TCI’s proprietary HDT blanket helps blow this adverse heat. According to TCI, its centralized testing has appear that HDT coatings can abate aqueous temperature by 10 degrees compared to accepted coatings or paint. “The calefaction alteration technology of the HDT blanket is proprietary, so we can’t acknowledge how it’s manufactured, but testing has apparent that it offers audible advantages that can accord to advocate and manual longevity,” says Scott.
Selecting the actual arrest dispatch for a torque advocate is abundantly abased on the rpm ambit of an engine, which is heavily afflicted by displacement, camshaft duration, compression ratio, and accessory ratio. TCI’s Artery Rodder and Saturday Night Special archetypal converters access arrest dispatch 300-500 rpm over stock. The Breakaway and StreetFighter converters access arrest dispatch by 1,000-1,500 rpm, while Super StreetFighter and Ultimate StreetFighter converters access arrest dispatch by over 2,000 rpm over stock. “One of the best important things is authoritative abiding that the advocate works with the cam as able-bodied as the rear gearing,” Scott advises. “A lot of bodies try to run a big cam with a artery blazon rear gear, and they end up affable the manual because the advocate is blockage absolutely aerial in adjustment to accomplish the abandoned smoother in gear. We acerb acclaim calling our tech band to accomplish abiding that you get the actual advocate the aboriginal time around.”
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