Strengthening the diff, any options, possibilities, recommendations?
- Thread starter Madhav
- Start date
Kenneth
1 AYC Bar
Did you not read my post?
While my rear diff casing is not technically from a type V, (its from a diamante, but it is the same part number) it is running in my car with an evo 9 LSD differential in it.
Diff casing $70
Rear shafts $80
Practically brand new Evo9 plate LSD $500
The thing to keep in mind is that if you don't back your mechanical skills (especially setting the diff preloads, backlash and gear contact pattern) then you will also have to pay someone the labour of setting it up for you.
While my rear diff casing is not technically from a type V, (its from a diamante, but it is the same part number) it is running in my car with an evo 9 LSD differential in it.
Diff casing $70
Rear shafts $80
Practically brand new Evo9 plate LSD $500
The thing to keep in mind is that if you don't back your mechanical skills (especially setting the diff preloads, backlash and gear contact pattern) then you will also have to pay someone the labour of setting it up for you.
mills_88
1 AYC Bar
- Location
- Perth, WA
- First Name
- Matt
- Drive
- Toyota Supra RZ - The Project
Holden Commodore SS VF Series 2 - The Daily
Sorry i completely missed your post somehow Kenneth. What you've done is what i'd like to do but i dont have the knowledge to set up the diff myself so would probably end up costing me twice that amount if not more. Will still look into it if i cannot get my AYC to function as that would give you strength and cornering ability,
All of the evo 4-9 RS models had helical front LSD's only the 4-6 ones fit into our transfer cases.
All evo 4 GSR's had open front diffs
Evo 5's were 50/50 open/lsd or there abouts
Most evo 6's had the LSD but not all.
The problem with the 4-6 helical LSDs is they are weak. They are inly held together by 4 countersunk cap screws and in operation the gears inside the diff "fight eachother" to bias the torqure to the wheel with the most traction. This causes extreme load on these 4 small bolts and they snap. This is mainly a grip thing not a horsepower thing thay breaks them and a heavier VR4 with sticky tyres is more likely to break one than an lighter evo.
If you do get one strip it down before it goes in the car and replace the cap screws with 12.9 grade ones and loctite them in place. I think I torqued them to 30ftlb or something similar (there will be a chart on the net somewhere with a torque for 8mm 12.9grade)
This doesnt make them bomb proofbut it does help them out. The photos attached is of a diff thay snapped the 12.9 grade cap screws but in saying that it did it at a track day on slicks. The same diff was in my car for a year or so previously and I never broke it with street tyres.
All evo 4 GSR's had open front diffs
Evo 5's were 50/50 open/lsd or there abouts
Most evo 6's had the LSD but not all.
The problem with the 4-6 helical LSDs is they are weak. They are inly held together by 4 countersunk cap screws and in operation the gears inside the diff "fight eachother" to bias the torqure to the wheel with the most traction. This causes extreme load on these 4 small bolts and they snap. This is mainly a grip thing not a horsepower thing thay breaks them and a heavier VR4 with sticky tyres is more likely to break one than an lighter evo.
If you do get one strip it down before it goes in the car and replace the cap screws with 12.9 grade ones and loctite them in place. I think I torqued them to 30ftlb or something similar (there will be a chart on the net somewhere with a torque for 8mm 12.9grade)
This doesnt make them bomb proofbut it does help them out. The photos attached is of a diff thay snapped the 12.9 grade cap screws but in saying that it did it at a track day on slicks. The same diff was in my car for a year or so previously and I never broke it with street tyres.
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