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- #21
@cghawk any update on your driveshaft install?
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You can actually get it 100$ cheaper at CJ Pony Parts too
https://www.cjponyparts.com/qa1-dri...ries-one-piece-gt350-gt350r-2015-2018/p/DS48/
Can you tell us the weight of each? to make up the difference in LBS? How do you like it? Do you feel any difference, less vibrations? Was the install easy?You sometimes have to call but I suspect that the difference in price is due to the CJ's listing not having an SFI rating sticker on it. I purchased mine through LMR and paid the additional for the sticker.
The QA1 piece is very well engineered. Be sure to carefully inspect the shaft upon delivery as the packaging QA1 is using isn't the most robust. The first shaft I had delivered was in a box completely torn open and hanging out the end. QA1 took care of me upon notification.
Just a suggestion, measure your driveline angles on the new shaft. I used an online calculator from Spicer and would be happy to compare data.
http://spicerparts.com/calculators/driveline-operating-angle-calculator
Can you tell us the weight of each? to make up the difference in LBS? How do you like it? Do you feel any difference, less vibrations? Was the install easy?
Thanks! great pictures!!
Rogelio
OEM two-piece steel shaft is ~31lbs and QA1 CF shaft is ~21 lbs. The difference in feel is subtle but definitely noticeable. It is very smooth throughout the range. I do have a very faint harmonic from about 47-52 mph in any gear and at any rpm. It was there before and the shaft didn't eliminate it.
The install isn't complicated at all. You do have to pay attention to the instructions as the front bolts and washers are color coded as the assembly was balanced in a specific orientation. QA1 does this instead of trying to bond or fasten any type of balance weight to the shaft.
Do yourself a favor and inspect that shaft often, I personally am not a fan of CF driveshafts because road debris and other garbage can chip away at the outer coating, then water, oil and whatever can get into the the layers, weakening it. They obviously work well, but that is their Achilles heal. The good news is that if you get a ding in it, you can usually find some clear paint and fill it in...sort of the way helos use duct tape on their CF rotor blades..sorta..whatever. But I bet it does make a big difference, I just prefer aluminum.
Everyone pondered the same thing when the 13/14 GT500 was released. Oddly enough, this has not proven to be the case. Far from it. And with respect to the QA1 shaft in a GT350, it is better protected than S197 factory iterations due to the positioning of the exhaust system. In other words, I wouldn't worry about but it never hurts to be on the lookout.I personally am not a fan of CF driveshafts because road debris and other garbage can chip away at the outer coating, then water, oil and whatever can get into the the layers, weakening it. They obviously work well, but that is their Achilles heal.
Hey Guys -
Since I have my driveshaft out of the car at the moment I am going to order a QA1 CF replacement. Is it necessary to pay the extra $100 for the SFI Approved?
Thanks.
Everyone pondered the same thing when the 13/14 GT500 was released. Oddly enough, this has not proven to be the case. Far from it. And with respect to the QA1 shaft in a GT350, it is better protected than S197 factory iterations due to the positioning of the exhaust system. In other words, I wouldn't worry about but it never hurts to be on the lookout.
No. The shafts are 100% the same in terms of construction with or without the certification sticker.
My goal with a DS upgrade is to have my car come off of corners a bit quicker. If a lighter DS will help me exit corners a bit quicker I'll be happy.
I'm wondering what the argument is that a lighter driveshaft can noticeably improve acceleration? Without attempting any real analysis, my thought is that the rotational inertia of the driveshaft is insignificant compared to that of the wheels.
Note I said "if". The wheels are what they are so they don't change. I'm running a wheel/tire package that is 10 lbs per wheel lighter than stock so that gain is already locked in. If the DS is lighter than stock it should respond similarly to a lightened flywheel. Regardless it's been determined the CF DS is only about 10 lbs lighter than stock. I'd still buy a CF DS but I doubt there would be any noticeable performance gains.I'm wondering what the argument is that a lighter driveshaft can noticeably improve acceleration? Without attempting any real analysis, my thought is that the rotational inertia of the driveshaft is insignificant compared to that of the wheels.