2017 SM (Street Mod) Autocross Discussion
Feb 8, 2017, 06:54 PM
#47
Gotta love Jon, he does so much you'd only know about from word of mouth or spending an hour on the phone with him (if you get a hold of him, an hour is easily spent).
Jacks has fantastic service and emails you with constant updates throughout the process but if I can get something special from Jon and have time, he gets my money. If I need it quicker or basic, Jacks is fantastic too.
Jacks has fantastic service and emails you with constant updates throughout the process but if I can get something special from Jon and have time, he gets my money. If I need it quicker or basic, Jacks is fantastic too.
Feb 8, 2017, 08:35 PM
#48
Jon is doing his best to work himself out of a job though. we got 7 year (nearly 1000 pro launches) out of one of his rebuilt transmissions (and the failure was a broken 4th gear syncro...on an autox car) and 4 years and counting out of a transfer case.
I think if you're having center diff problems you really have to get your wheel spin under control. the center diff spider gears should have almost zero rotational speed, just the difference in rolling distance from front axle to rear axle when turning, so you shouldn't see any heat marks or wear*.
*breaking teeth off from SM levels of torque are excluded from this statement.
I think if you're having center diff problems you really have to get your wheel spin under control. the center diff spider gears should have almost zero rotational speed, just the difference in rolling distance from front axle to rear axle when turning, so you shouldn't see any heat marks or wear*.
*breaking teeth off from SM levels of torque are excluded from this statement.
Mar 16, 2017, 01:00 PM
#54
Saw this video of the Tilton T/A car thinking man that car is stiff for the aero load. And was wondering if he got the porpoising I couldn't dial out when I ran real stiff spring. Then all the sudden I get the best clip of it happening Ive seen so far.
I've watched it a dozen times with my face about 6in a way from my 30" monitor now to really try and see the dynamic. I can see the rear suspension moving but the front is all bounce on the tires. That totally makes sense given weight distribution of our cars, but the front tires are definitely a relevant spring in the spring/mass system.
So I understand peoples desire to run more rate, I believe that should never be high enough the tires, and under damped spring, should be significantly relevant.
Edit: Oops, that was suppose to start at 10m3s, skip forward and you'll get a great shot of it.
I've watched it a dozen times with my face about 6in a way from my 30" monitor now to really try and see the dynamic. I can see the rear suspension moving but the front is all bounce on the tires. That totally makes sense given weight distribution of our cars, but the front tires are definitely a relevant spring in the spring/mass system.
So I understand peoples desire to run more rate, I believe that should never be high enough the tires, and under damped spring, should be significantly relevant.
Edit: Oops, that was suppose to start at 10m3s, skip forward and you'll get a great shot of it.
Mar 17, 2017, 01:46 PM
#57
I think they have one of the upright options, but I have no clue on specific details theirs run. I obviously have my opinions on the matter, but have thought about trying another 100lbs all around again and seeing if hop comes back. Right now I just get slidy if I over drive, not hoppy like I use to.
Oh yeah, you guys raised the car a bunch at some point. Did that fix your hopping issues I know you've seen before? Putting 2 and 2 together, would make sense.
Oh yeah, you guys raised the car a bunch at some point. Did that fix your hopping issues I know you've seen before? Putting 2 and 2 together, would make sense.
Jun 16, 2017, 08:50 PM
#58
Bringing this back from the dead. We found the limit of our trans in NJ this year. A little north of 700 launches on the case. I had just done fresh internals this winter, but the output shaft bearing tried to exit the bell housing side of the trans. Also broke a rear axle in the rear diff, which cracked the carrier housing. Since then I changed clutches. An unspring triple disc is too harsh. Toledo was the first event on a sprung twin, and the launches are so much smoother.
We had a different issue in Toledo that had me worried about the motor, so we packed it in. Still need to get to the bottom of that one, but I hope the clutch change turns the corner on reliability for this car.
We had a different issue in Toledo that had me worried about the motor, so we packed it in. Still need to get to the bottom of that one, but I hope the clutch change turns the corner on reliability for this car.
Jun 16, 2017, 08:58 PM
#59
The number of runs you guys make definitely pushes that reliability factor. I feel like at a certain point you stop modding and just spend your time/money in fixing. And some how that part gets exponentially more expensive...
Really looking forward to seeing how the OS Giken clutch holds up. It may be what I swap to after this round of XTSS (they seem to last me 2 years-ish)
Really looking forward to seeing how the OS Giken clutch holds up. It may be what I swap to after this round of XTSS (they seem to last me 2 years-ish)
