^ are you going to ohiostiva?
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It's torque that kills gearboxes. Horsepower needs to have an RPM associated with it to get an idea of the capacity of a gearbox, otherwise the gearing is rated at a maximum torque value that it can withstand before it starts to physically self destruct. The gear reduction ratio also has a lot to do with it, since that's the torque multiplication factor the gearbox will experience at the output shaft. If you look at industrial gear reducers, everything is based on 4 factors.
* Service factor
* Input HP
* Input RPM
* Gear reduction ratio
* Output Torque
Service factor depends on the loading characteristics of the power source, shock loading of the driven equipment and hours of continuous operation. The most common input RPM is 1750 since that's the synchronous speed of a typical electric motor @ 60Hz.
You can have a helical gear reducer of a specific case size and a 10:1 ratio. This box may handle 5hp @ 1750 RPM input. If you lower the input speed to 1175 RPM, it may only handle 3.5HP. If you raise the input speed to 3600 RPM it may handle 10HP. The reason for this is that the torque remains the same (Torque in LbFt = (HP X 5252) / RPM). If you take this same gearbox and change the ratio from 10:1 to 60:1, The rated input capacity drops dramatically since the torque is now multiplied by a factor of 60 instead of a factor of 10.
This can all be based on a 1.0 Service Factor, which would be no shock loading and close to perfect conditions. Most applications require a 1.25 to 1.5 service factor, meaning we would have to divide the rated input HP figures by the service factor to get the "real world" ratings that compensate for typical abuse.
The purpose of all this is to put everything in perspective. If we had a 60HP/1800 RPM electric motor and wanted to couple it to a 5:1 gearbox with a 1.5 service factor, the gearbox would be half the size of our Festivas. Yet we have a 62HP gas motor and our tiny transaxles survive for years and thousands of miles if we don't abuse them. The reason is that we have relatively low torque due to the high RPM at which we develop the 62HP. In addition, MOST automotive applications require low levels of service factor. Look at the transmissions on some motorcycles that develop twice the HP our Festiva do. A turbo motor that develops 170HP @ 7500RPM may not be much harder on a transmission than a motor that develops 100HP@4500 RPM, although it all depends on the peak torque developed, regardless of the RPM.Brian
93L - 5SP, FMS springs, 323 alloys, 1st gen B6, ported head & intake, FMS cam, ported exhaust manifold w/2-1/4" head pipe.
04 Mustang GT, 5SP, CAI, TFS plenum, 70mm TB, catted X, Pypes 304SS cat-back, Hurst Billet+ shifter, SCT/Bama tuned....4.10's & cams coming soon
62 Galaxie 2D sedan project- 428, 3x2V, 4SP, 3.89TLOC
1 wife, 2 kids, 9 dogs, 4 cats......
Not enough time or money for any of them
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:shock:
Mike, AKA the sasquatch
1990 LX, bp+T/g25mr, 9psi dynoed at 194HP, turbonetics t3/to4e 57trim, haltech E6X standalone, 550cc injectors, turbosmart wastegate, synapse BOV, walbro 255 fuel pump, aeromotive FPR, AEM wideband, 3 inch exhaust, huge FMIC, 9LB flywheel, 6 puck clutch and way more parts that im forgetting i installed lol...
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Originally posted by mattdickmeyer View PostA friend of mine knifed a prostitute!Brian
93L - 5SP, FMS springs, 323 alloys, 1st gen B6, ported head & intake, FMS cam, ported exhaust manifold w/2-1/4" head pipe.
04 Mustang GT, 5SP, CAI, TFS plenum, 70mm TB, catted X, Pypes 304SS cat-back, Hurst Billet+ shifter, SCT/Bama tuned....4.10's & cams coming soon
62 Galaxie 2D sedan project- 428, 3x2V, 4SP, 3.89TLOC
1 wife, 2 kids, 9 dogs, 4 cats......
Not enough time or money for any of them
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its summit racing! thats kewl!IF ONE FESTI IS GOOD THEN TWO IS BETTER!
93 L TEAL ( this winter new paint) full 2.25" exaust w/flowmaster 2 chamber! all black interoir! coil overs and aspire swap in the wings and 14" jetta mk3 alloy wheels! bp+t on the way!
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Been busy lately have'nt had time to do much with it. Experimenting with 40lbs injectors , hurt the head gasket making some warm up pulls on the dyno . Making a copper head gasket to remedy this , also building a ice cooler, and vaf delete. Pulls were part throttle under 4500 rpm afr was stable untill 3500rpm, vantage pro showed vaf pegged out at 4.87v putting pcm into default shutting down injector driver , vaf delete should make tunning problems solved as at part throttle it's very promising!Looking forward to 100% throttle soon!PROPOGATE! AND FACILITATE!
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