Quaif lsd - Page 3 - PeachParts Mercedes-Benz Forum

gsxr · #31 07-21-2010, 10:40 AM

If you compare the tech drawings in my previous post, you can see that the 7V and 8V are the same, except for dimension L4... the 7V is for taller (lower numerical) ratios, the 8V is for lower (higher numerical) ratios. Unfortunately the part number in the drawings appears to be a diff carrier casting number, so it doesn't appear in the EPC, making it harder to cross-reference. I only know the 5V cross references for sure.

Most likely you'd need to swap in a 210mm diff from a different car (C43 perhaps?) and then put the appropriate Quaife into that housing.

Pagz · #32 07-21-2010, 08:44 PM

The C43 uses a 210 case with 202 carrier,of which i dont think the will be much use as the ratios are not right...however making the 210 case fit a W202 sub frame is easy as im pretty sure the C43 uses W208 rear cover.

I have has another look into the epc,turns out the 91 - 94 S280(non US model) commonly used the 210 case with a 140 carrier...ratios were 3.46 and 3.69 + a 3.92 with ASD. These were commen here so are easy to source. the question is does the 140 carrier carry the right size gearing to mate up with the quaife with or without the spacer...and will the quaife actually fit into the 210 case?...

If there is a good chance then i will buy one but where looking at 3-400 for the diff shoudl i go with it.

whipplem104 · #33 07-22-2010, 10:43 AM

I am pretty sure the 210 case uses a 185mm ring gear. A guy on one of the other forums with a c43 built a limited slip with a 190 lsd in his. Also I have looked at the epc on this and have not found a common carrier to the ones that quaife will swap with. I think the only options are the 129/140 case with the qdf5v and the 220 case with the qdf7 or 8v. I know that the early 210 e55 have a different case that the carrier cross references to the qdf5v. I do not remember which case that has off the top of my head.
I think that the 220 case with the qdf8v is going to be the best option for the gears you are looking for. The problem is knowing what to get. Buy a used differential and measure the stock carrier and see if the 8v will fit before you order one though. This is what I did on the 5v for my car. And by all means keep us posted. I may want to go this route if I do not like the 3.06 ratio in my car.

whipplem104 · #34 08-12-2010, 11:27 PM

Well I finally got around to finishing the setup and installing the quaife with the 3.06 gears. I have not done any full throttle digs from a stop yet but have gotten on it in some turns and it feels great. I can give it so much more gas in the turns and power through. It is so progressive in the torque transfer. I cannot wait to go back to the track and get the 60' times down.

Pagz · #35 09-27-2010, 04:26 PM

whipplem,
How is the new lsd holding up?

Just a quick update on my part,i have finally removed my diff for inspection and all is as you guys have confirmed. L4 is ~38mm,L1 is ~125, 185mm ring gear. I havent measured but at a guess D2 is not the right size for any of quaifes either.

I will research the 210 case some more,im not keen on the 220 case,its massive and requires alot of extra work. i would look into a modified or custom lsd over this.

Yuk,whats all that black stuff in the bottom of my diff case? seems to be attracted to my magnet

i changed the oil with redline synthetic a few years back.

whipplem104 · #36 09-27-2010, 10:15 PM

The rear end is working great. I have had zero issues other than the rear end being a little loose in the turns. It is completely undetectable until you ask for it to be there. I have been beating on my car quite a bit trying to get the tuning in for e85.
I would really look at going with either the w129 case or the w220 case. The qdf8v is the same as the qdf7v except the gear ratios. It is simply a matter of finding out what gears it was set up for. But I would guess by the L4 dimension that it is a 3.27 or higher. This is a 210mm ring gear. You can run either one piece rear axles or bolt up flanges. The w208 clk came with bolt in flanges with this case as many others. If I snap an axle this is the direction I am heading.
It is tempting to just go for the 215mm ring gear setup though from a w209 because the qdf9v is so much cheaper. It would basically pay for the custom axle halves.

Pagz · #37 10-07-2010, 04:07 AM

By a little loose in the corners do you mean you have more grip under power but when you loss the grip you really loose it?.

Turns out theres quite a bit of metal in the oil,evident by the globe of silver infused oil around the end of my pickup magnet....iv noticed im getting some trans noise on deceleration...could be the diff or gearbox i guess. might be worth running a magnet permanently on the diff? . I compared the play to other diff units at my parts supplier,didnt seem any different.apparently replacement crown and pinions are very pricey!.

gsxr · #38 10-07-2010, 09:45 AM

Quote:

Originally Posted by Pagz

...apparently replacement crown and pinions are very pricey!.

They are VERY pricey to buy new - totally not worth it. Then, the labor involved in the R&R is very difficult (borderline impossible) as DIY, and very few shops are capable of setting up an MB gearset properly (read more details at this link). The ROI on installing a new ring & pinion set is extremely low - I'd never even consider this unless you needed a very unusual gear ratio in a specific housing and were unable to find it used. Otherwise, I'd just get a good used diff from a salvage yard, usually $300-$400 or so. The three LSD's that I've built so far were all built from salvage yard cores and all have worked great.

whipplem104 · #39 10-07-2010, 10:17 AM

Yes I did mean fishtailing.
The cost of the mercedes parts really makes you look at other ideas. I have been thinking that if my rear end breaks that I am going to get a srt8 215 mm setup. You can buy the whole thing set up with a lsd for 2,000 in almost any gear ratio. The getrag rear end for the srt8 is also an option. Some custom half axles and driveshaft and then you are basically unbreakable.

gsxr · #40 10-07-2010, 10:21 AM

Whipple, do you really think you might break your 210mm MB diff with the Quaife? I thought that would be plenty strong for up to at least 500-550 crank HP.

Pagz · #41 10-07-2010, 06:14 PM

Hmm im starting to think this is going to be more of a pain than its worth.
Im going to take all the measurments i can and put mine back in for the summer as its getting too late in the year to go custom mounting with custom shafts etc i will continue to look into the newer mb cases with the correct ratios (3.46 +) that i may be able to use with the later quaife units but i suspect i will always have the same problem with the crown gear offset as they are all made for autos,hence why going with a custom lsd in my original case may be overall a cheaper option for me both time and cost.

Paul

Pagz · #42 10-08-2010, 06:17 PM

Quick question guys,whats the torque spec on the rear cover bolts,cant seem to find that anywhere!!.

Cheers,
Paul

Pagz · #43 10-09-2010, 12:45 AM

Interesting,quaife sent this to Ross who owns the auto version of my W202,doesnt look like it will fit his however the part number is QDF28B!

revbond · #44 12-21-2010, 03:18 AM

try this link for EPC "detali.ru" click on mercedes to the left.

whipplem104 · #45 12-25-2010, 05:01 PM

I was looking into a solution for the w202. I found that the w208 subframe and the w202 subframe update to the same unit. Axles and differentials will be easy to swap. The clk55 came with the 220# carrier and large half axles. This would be a easy swap for a 210mm ring gear and the qdf7v would be the unit to use. This would eliminate the need for any custom parts. What I do not know is the difference between the original subframes and if that would be needed to do the swap. The flex disc would be different also and require some looking into.