Is the e-diff relay under the driver seat and the F1 is the passenger side? (For LHD cars)
LHD side on US car. Behind the drivers seat. Remove 5 screws and pull the panel out. F1 relay is right next to it. EDiff ECU is marked. Stef’s website has excellent instructions and pics.
I just received an email from Stef re: E-Diff vs LSD. The E-Diff is not a limited slip differential. When he says "open" rear that's exactly what he means. A non-locking differential. A limited slip differential uses mechanical forces to determine which clutches to engage. The TCU in the F430 decides when to lock clutches, which is apparently every time you are not going perfectly straight. Even then there is a residual 5-10% locking. I misunderstood his description believing that the F430 rear was inherently a LSD that was augmented by the E-Diff mechanism. It is not. Ray
Sorry guys, still trying to understand. With Stef's device installed will the 430 do a two wheel burnout even though it has an open diff? Also, when exiting a turn under hard acceleration is power going to both wheels? Very interested in the Smart E-diff bypass just trying to understand it a bit more. Thanks
I agree i dont get it either or the benifit it has How did the f430 have improved laps time with e diff as opposed without if its crap??
I think the issue that Stef is/was fixing is these diffs are now aging. As they age and wear, it could be a point of failure. I don't think there's any debate that applying tech to creating a better lap time is the way to go. This is more about removing a potential point of failure as we drive them on the street. Although I have to confess I do not understand the eDiff well enough to describe how it functions under CST mode. I thought it was almost/is entirely disengaged. Rather simplistically, I think about Stef's SEB as bringing that situation to SPORT mode and allowing me to decide when it's used. The benefit isn't faster lap times, it's about addressing a known and expensive weakness. Replacing the e-diff solenoid can be around $1,000. This solution reduces (significantly) the wear on that item due to it not being constantly pressurized and wear on the eDiff and plates as it is not being constantly engaged. In full disclosure, I did buy one and therefore believe there's a benefit...although still haven't driven the freakin' thing. I have no affiliation with Scud Ing, but do own a few of their products.
Thanks If the only benifit is parts lasting longer i dont see it as a benifit if performance is affected!
Seems to me this is a device that can make everyday driving somewhat smoother if that's important to you. Does not appear to be (nor does Stef claim) that this is a performance improvement. With 500hp, real wheel drive and an open diff I don't see anyway around excessive wheel spin when trying to maximize exit speed. Still interesting to me because I run 235's up front, nothing wrong with saving components, and this device can be turned off. I don't understand the claim from Stef's web page that sticky tires can't be used with a Ferrari E-diff. Anyone who installed this please share your experience.
I think the problem with sticky tires is that it puts too much stress on the clutches id you are hammering it on a racetrack and it will wear quickly or fail
I've never slid my car sideways to have the e-diff rein me back in. Probably never will. If I was to disable the e-diff I would want it to remain as a LSD like my other cars. I always thought these cars had a LSD which can be controlled electronically. I thought with CST off the nannies are gone and you just have an old school posi trac LSD. Might have to spin the tyres up and find out.
Likewise - I don't slide my car around much either. Understanding the physics and exactly what the product is doing or not doing is interesting to me.
Maybe it's the e-diff that gets you traction when you need it and it's the individual wheel braking that pulls you back in if you go sideways.
We need someone to sacrifice their rear tires to the cause and report back. In sport, race and oh crap mode.
I want an excuse my wife will buy that will allow me to junk these practically-new Bridgestone tires and get the Michelin's as I had on my Z06. If the rear tires are worn down to dangerous levels to where they will be a liability in rainy Southern California ― it does rain here ― then replacing them is justified on a cost-benefit ration analysis basis. I hereby volunteer. Not for myself, but for the greater good of the community. Standby for updates.
Huh? Im trying to gain an understanding, as i do with most things in life, then make a decision Seems like no one really understands it Or are you a sheep?
I just tried an experiment. I jacked the car up on the Quick Jacks with the transmission in neutral, and the parking brake off, with the ignition on. I manualy turned the left side rear wheel. The other wheel turns, showing that there is some residual locking of the differential even with the SEB on disable.
Politically motivated insult aside, your posts generally are short and have a negative aspect. You don't like the Scuderia paddles? Don't buy them. Speculating that they cause unwanted shifts if you flash the high beams or use the wipers with no first hand experience is irresponsible. The 430 Challenge does not have an E-DIFF system. If it was useful for the track, it would have an E-Diff. Baahhh
