Has anyone tried the Quaife QDF26E in the IS350 yet?
11-30-11, 04:23 PM
#1
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Has anyone tried the Quaife QDF26E in the IS350 yet?
Has anyone tried the Quaife QDF26E in the IS350 yet? Would love to hear any pros/cons... Currently $970 vereses the only other option I have seen is over $2000
11-30-11, 06:55 PM
#2
I did a search and didn't find anyone that had. But I had a Quaife helical LSD that I installed into my Civic trans and I loved it. If I could see myself actively auto-xing the 350 I would invest in one. It has its advantages and disadvantages...so depending what you are going to be doing with the car you might wanna go this route or with a clutch-type LSD.
12-01-11, 04:13 PM
#3
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12-01-11, 05:23 PM
#5
It is listed for the IS350 in a few listings online, such as:
http://www.autotech.com/quaife/news.htm
Jeff
http://www.autotech.com/quaife/news.htm
Jeff
Last edited by Jeff Lange; 12-01-11 at 06:05 PM.
12-01-11, 05:28 PM
#6
Cus Quaife and the US Distributor of Quaife products (Autotech) says so :
http://www.autotech.com/quaife/index2.htm
Dang slow tablet...you beat me too it Jeff! Lol! I'll contact Autotech tomorrow. I got my Quaife for my Civic from them years ago.
http://www.autotech.com/quaife/index2.htm
Dang slow tablet...you beat me too it Jeff! Lol! I'll contact Autotech tomorrow. I got my Quaife for my Civic from them years ago.
12-02-11, 11:06 AM
#7
Just got off the phone with Ryan at Autotech (which is no longer the exclusive distributor of Quaife LSDs in the US any longer), he said they have 5 units in the stock. They said that they were a limited production run, and because demand was/is low they discontinued the LSD. Their online price is $970 without shipping, and that's basically at their cost he said. He said they are a confirmed drop-in mod, minus any needed bearings/shims/etc.
Grab them up before its too late!
Grab them up before its too late!
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12-05-11, 04:49 PM
#8
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Hmmm. Wonder if it would fit in the F's diff???? That would be a very cheap solution!
Lexus has clearly made it challenging to figure this out from the parts catalog. The outer bearings are identical across a wide range of Lexus products, but they won't say if the housing from the IS-F is the same as the housing for the IS350. Not quite sure I'd want to bet $1k on it working or not.
Lexus has clearly made it challenging to figure this out from the parts catalog. The outer bearings are identical across a wide range of Lexus products, but they won't say if the housing from the IS-F is the same as the housing for the IS350. Not quite sure I'd want to bet $1k on it working or not.
Last edited by lobuxracer; 12-05-11 at 04:58 PM.
12-05-11, 06:10 PM
#9
Hmmm. Wonder if it would fit in the F's diff???? That would be a very cheap solution!
Lexus has clearly made it challenging to figure this out from the parts catalog. The outer bearings are identical across a wide range of Lexus products, but they won't say if the housing from the IS-F is the same as the housing for the IS350. Not quite sure I'd want to bet $1k on it working or not.
Lexus has clearly made it challenging to figure this out from the parts catalog. The outer bearings are identical across a wide range of Lexus products, but they won't say if the housing from the IS-F is the same as the housing for the IS350. Not quite sure I'd want to bet $1k on it working or not.
https://www.clublexus.com/forums/is-...nto-is250.html
01-05 IS300 models have a 205mm rear differential
06-08 IS250 AWD models have a 190mm rear differential (A Torsen from an IS200/RS200 Altezza might work well in this application)
06-11 IS250 RWD & 09-11 IS250 AWD models have a 205mm rear differential (The IS300 Torsen should be a bolt-in upgrade for this application)
06-11 IS350 and IS F models have a 208mm rear differential
So no, this won't work for an IS350, you may be able to use a 2010-11 IS F Torsen LSD, but you wouldn't want to use the complete IS F pumpkin, as the IS F has a 2.9'ish final drive, which wouldn't be a good match to the IS350's transmission gearing. (IS350 has a 4.08:1 final drive). I don't know if anyone has tried to put the IS F Torsen into an IS350 differential though, so I don't know much about that.
Jeff
06-08 IS250 AWD models have a 190mm rear differential (A Torsen from an IS200/RS200 Altezza might work well in this application)
06-11 IS250 RWD & 09-11 IS250 AWD models have a 205mm rear differential (The IS300 Torsen should be a bolt-in upgrade for this application)
06-11 IS350 and IS F models have a 208mm rear differential
So no, this won't work for an IS350, you may be able to use a 2010-11 IS F Torsen LSD, but you wouldn't want to use the complete IS F pumpkin, as the IS F has a 2.9'ish final drive, which wouldn't be a good match to the IS350's transmission gearing. (IS350 has a 4.08:1 final drive). I don't know if anyone has tried to put the IS F Torsen into an IS350 differential though, so I don't know much about that.
Jeff
12-05-11, 09:29 PM
#10
I hadn't been able to confirm that the IS F and IS350 differentials are actually interchangeable. From what I could tell, I think they might be. They share many similarities, however there are parts that cannot be verified without attempting to do it. The differential housing on the IS F and IS350 have different part numbers, which doesn't necessarily mean much, I mean many parts are the same (bearings, axles, subframe, etc.).
Basically everything external to the differential is the same, and they share the same number of ring gear bolts and apparently they are the same size (208mm), so while these things tend to point to them being mostly interchangeable, I haven't cross referenced enough to know for sure. I don't own an IS350 or IS F, so I had no cause to check into it extensively. Now that I am on the topic though, why don't I go ahead and do that.
41111-53060 - '08-12 IS F Rear Differential Housing (Pumpkin)
41301-53040 - '08-09 IS F Rear Differential (Open)
41301-53050 - '10-12 IS F Rear Differential (Torsen T2)
41111-53030 - '06-12 IS350 Rear Differential Housing (Pumpkin)
41301-50030 / 31 - '06-12 IS350 Rear Differential (Open)
So while on the surface that may not seem like much, we need to cross reference the IS F open differential to what else it is used in, and see if maybe that case crosses over to something that will link back to the IS350. The differential case in the IS F is only used in the IS F, however, the open differential from an IS F is also used in the 08-12 GS460 and 07-12 LS460 / 460L:
41111-53030 - GS460 / LS460 / LS460L Rear Differential Housing (Pumpkin) -- Same as IS350
41301-53040 / 41 - GS460 / LS460 / LS460L Rear Differential -- Same as IS F
So, after all that, I'd say that yes, the IS F and IS350 differentials are in fact quite interchangeable.
Jeff
Basically everything external to the differential is the same, and they share the same number of ring gear bolts and apparently they are the same size (208mm), so while these things tend to point to them being mostly interchangeable, I haven't cross referenced enough to know for sure. I don't own an IS350 or IS F, so I had no cause to check into it extensively. Now that I am on the topic though, why don't I go ahead and do that.
41111-53060 - '08-12 IS F Rear Differential Housing (Pumpkin)
41301-53040 - '08-09 IS F Rear Differential (Open)
41301-53050 - '10-12 IS F Rear Differential (Torsen T2)
41111-53030 - '06-12 IS350 Rear Differential Housing (Pumpkin)
41301-50030 / 31 - '06-12 IS350 Rear Differential (Open)
So while on the surface that may not seem like much, we need to cross reference the IS F open differential to what else it is used in, and see if maybe that case crosses over to something that will link back to the IS350. The differential case in the IS F is only used in the IS F, however, the open differential from an IS F is also used in the 08-12 GS460 and 07-12 LS460 / 460L:
41111-53030 - GS460 / LS460 / LS460L Rear Differential Housing (Pumpkin) -- Same as IS350
41301-53040 / 41 - GS460 / LS460 / LS460L Rear Differential -- Same as IS F
So, after all that, I'd say that yes, the IS F and IS350 differentials are in fact quite interchangeable.
Jeff
Last edited by Jeff Lange; 12-05-11 at 09:48 PM.
12-06-11, 11:30 AM
#12
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So this is pretty close to certain with the only really big assumption being the ID of the ring gears is identical, which also raises some interesting ideas - final drive ratios in the GS and LS - if they're different from the F and the 350, it means we have another option - maybe a little better than the 350's very low gear - like the 3.13 from the AWD?
Just peeked the parts - same number of bolts, same bearings for pinion and ring gear...hmmm...this might be quite the find! I'd bet with the 3.13 gears the F would be very competitive with the 350 off the line and not crippled with wheel spin as it is with the 350's 4.08 gear.
Just peeked the parts - same number of bolts, same bearings for pinion and ring gear...hmmm...this might be quite the find! I'd bet with the 3.13 gears the F would be very competitive with the 350 off the line and not crippled with wheel spin as it is with the 350's 4.08 gear.
Last edited by lobuxracer; 12-06-11 at 11:41 AM.
12-06-11, 10:20 PM
#14
So this is pretty close to certain with the only really big assumption being the ID of the ring gears is identical, which also raises some interesting ideas - final drive ratios in the GS and LS - if they're different from the F and the 350, it means we have another option - maybe a little better than the 350's very low gear - like the 3.13 from the AWD?
Just peeked the parts - same number of bolts, same bearings for pinion and ring gear...hmmm...this might be quite the find! I'd bet with the 3.13 gears the F would be very competitive with the 350 off the line and not crippled with wheel spin as it is with the 350's 4.08 gear.
Just peeked the parts - same number of bolts, same bearings for pinion and ring gear...hmmm...this might be quite the find! I'd bet with the 3.13 gears the F would be very competitive with the 350 off the line and not crippled with wheel spin as it is with the 350's 4.08 gear.
41201-59235 - IS F / GS460 / LS460 RWD Ring & Pinion Set (2.97:1)
41201-59245 - LS460 / LS460L AWD Ring & Pinion Set (3.13:1)
41201-59175 / 76 - IS350 RWD Ring & Pinion Set (4.08:1)
41201‑59065 - IS350 AWD Ring & Pinion Set (3.77:1)
So really the main ingredient that's missing is either the ring gear inner diameter and/or the bolt spacing to the differential.
Jeff
12-07-11, 06:01 PM
#15
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It would be a pretty big favor to ask a dealership parts guy to order this stuff and check it. I surely don't want to tie up a few grand ordering and returning what I don't want. 3.77 looks REALLY sweet if it could work in the F for the quarter mile guys. I'd call it best compromise between quick and high revving. Still the 3.13 would mean top speed would have to be in 7th, not 6th. Same is true for the 3.77 - might have to be in 8th for top speed.