I remember at one point, I think on the Miata.net board, that someone did do a swap for LSD. I remember them saying that there are special tools needed to work in the diff and so it would be better unless you have really good experience to just swap out a complete diff, which is not an easy thing to do. I think maybe Goodwin racing might be able to shed some light on this?
Use a VIN to pull up the car-- i grabbed a random Abarth VIN from Autotrader. For convenience, here's the one I used: JC1NFAEK4H0116928
Next, change the dropdown menu on the left from "parts" to "accessories".
Looks like the Abarth differential (68329082AA ?) costs approx. $750. Is that all that is required for the conversion? Am I looking at this right? Would love to get your thoughts on this.
Use a VIN to pull up the car-- i grabbed a random Abarth VIN from Autotrader. For convenience, here's the one I used: JC1NFAEK4H0116928
Next, change the dropdown menu on the left from "parts" to "accessories".
Looks like the Abarth differential (68329082AA ?) costs approx. $750. Is that all that is required for the conversion? Am I looking at this right? Would love to get your thoughts on this.
The website would not accept the VIN you posted when just visited.
It's probably the GKN LSD found in the MX-5; and it's quite likely some shims will be needed to bring the ring and pinion gears back into proper mesh.
The website would not accept the VIN you posted when just visited.
It's probably the GKN LSD found in the MX-5; and it's quite likely some shims will be needed to bring the ring and pinion gears back into proper mesh.
Use a VIN to pull up the car-- i grabbed a random Abarth VIN from Autotrader. For convenience, here's the one I used: JC1NFAEK4H0116928
Next, change the dropdown menu on the left from "parts" to "accessories".
Looks like the Abarth differential (68329082AA ?) costs approx. $750. Is that all that is required for the conversion? Am I looking at this right? Would love to get your thoughts on this.
I was able to pull up that car, but was unable to find a differential, or major parts for an LSD for $750. They list parts for over $2000 that aren't even LSDs. The part number you have is for a half shaft.
The website would not accept the VIN you posted when just visited.
It's probably the GKN LSD found in the MX-5; and it's quite likely some shims will be needed to bring the ring and pinion gears back into proper mesh.
The differential doesn't factor into the final drive ratio. Unless you are mistakenly referring to the final drive assembly as the differential.
Furthermore, a final drive assembly will cost much, much more than $750. The MX-5 final drive w/LSD is around $2000.
We used the Miata rear housing with stock Miata limited slip because it was the only way at the time to get limited slip in the Fiat and lack of limited slip was holding back performance at Autocross events.
Yes, that meant the much taller Miata 2.9 FDR. Now our Fiat does about 67mph in 2nd gear, top gear and 2500 rpms is 75mph (gas mileage on long freeway drives is improved).
Our rear housing went to our friends at OS GIKEN for development of limited slip that fits the Fiat stock housing and FDR, hope to have those by Spring.
In the meantime, with big help from that Miata 2.9 rear with limited slip our Fiat took it's first Top Time of Day at BMW CLUB autocross in December. It beat every BMW, Porsche, Corvette, Miata, etc.
In addition to limited slip, that result took some other supporting bits including our light brake caliper conversions, light battery, and particularly these essentials:
In the meantime, with big help from that Miata 2.9 rear with limited slip our Fiat took it's first Top Time of Day at BMW CLUB autocross in December. It beat every BMW, Porsche, Corvette, Miata, etc.
I'd expect that the 2.9:1 rear end would work nicely, especially on a tuned car that has the torque to pull it at highway speeds without issue.
Once thing I liked about the S2000 (AP1) was that top of 2nd was around 104-106 km/h if you pushed it deep into the rev limiter. Rarely ever needed to shift to third in parking lot autocross events. Friends in early Miatas ended up shifting much more.
Complete ND housing with limited slip can be used as we noted above but indeed ND limited slip internals need too much shim to fit the 3.4 FDR in the Fiat rear housing because they are made for the 2.9 in the Miata.. But in the coming months we expect both our OsGIKEN solution and Cusco for the Fiat housing with 3.4.
Hello Everyone:
Here is a video of my current engine build.
As of about a week ago I put the short block together. Everything worked out quite well, ring gaps were filed to spec, bearings plastiguaged just right, bore taper is perfect and so on. I then had to go on a trip. When I...
I took delivery of a brand new Abarth a week ago and with our lockdown haven't really had a chance to enjoy the car, but I have been able to get a few hundred kilometers in.
I also own an Alfa Romeo Mito QV which had the identical 125KW engine, and that was one of the reasons I was drawn to the...
doesnt mean the oil is fully warmed up...Right. So we should still take it a little easy,
Until we know the oil is fully flowing correctly...
Right???
Cyberbill
I installed the GoPedal yesterday.OMG, crazy great. My wife hates it because her head is thrown back in the seat with every shift. You can program to whatever performance u like. I have it set on the highest setting. It truly is amazing how the car feels. Once I received the correct unit for my...
We invite you to join the largest Fiat 124 Spider forum community & owner’s club! Here you can discuss Abarth, turbo & tuning, service, specs, maintenance plus more!
92sundevil · updated 
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