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-   -   New Shock ECU & FHP Steering ECU, etc. installed (

Bratman 05-24-2014 10:55 PM

New Shock ECU & FHP Steering ECU, etc. installed
Today I installed shock ECU 205619 (apparently I'm the first to try this part #. The car had 183960, which had too much pitch and roll for my liking), as well as the OEM FHP steering ECU 175891 on my '03 575M, assembly # 49585, VIN 132376. The install went fairly smoothly with no issues to report.

Earlier this week I also had the alignment done and ride height lowered slightly (mainly at the rear) by a good shop. I asked for quite a bit of negative camber in the front to help reduce understeer. Ended up with just over 2 degrees negative camber in the front and 1.5 negative camber at the rear. Front toe-in is 0.15 degrees and rear is 0.20.

After driving the car most of the day in various conditions/speeds, I can report that these changes transformed the handling. The shock ECU made a very noticeable difference. The shock damping feels much tighter, both for compression and rebound. The FHP steering ECU made the steering noticeably heavier, tighter and improved steering feel.

The alignment helped reduce understeer significantly, but it still pushes a bit more than I prefer when i really lean on it. Rear breakaway is now much smoother and less abrupt.

Also made a few other changes; replaced the center exhaust resonator with the Ferrari OEM straight pipes for 2004 and later model year 575s (bought a set on ebay for $700. The dealer wanted around $3,500 per side...), and bypassed the vacuum solenoid for the muffler flaps so they're open full time. The sound is much nicer and richer now IMHO. The throttle response and torque seem just as good or better after these changes.

Overall I'm very happy with it now. The car handles, feels and sounds as I thought it would/should.

tazandjan 05-25-2014 07:35 AM

Alex- Glad it all worked out well and that 205619 sounds like a really good shock ECU. Like you said, you are the first I know who has fitted it. If you want less understeer, a thicker rear anti-roll bar will push her in that direction. Mine is pretty much neutral. Maranello Skunkworks' hollow 22 mm bar would be the way to go, once produced.

I have Steve's remote bypass valve controller my techs will install shortly, and will let you know how that works. Will be hooked to the unused rear fog light switch.

Ferraridriver 05-25-2014 11:18 AM


Originally Posted by tazandjan (Post 422441)
Will be hooked to the unused rear fog light switch.

Taz, be aware that the fog light switch really is a "dummy" switch, there is no switch inside there even though it has contacts on the back.

There are some that will work for your use on eBay for $50.00.

tazandjan 05-25-2014 04:34 PM

Dave- Affirmative, I intend to pick up an extra switch.

tifosi_ 05-26-2014 08:32 AM

I have a curious issue. Since my Assembly # is 47143, Alex tells me that according to what has previously been posted, the shock ECU 201674 that we found already installed in my 575 (before we were going to install what we thought would be the newer 197211) is not supposed to work with my early Assembly #. So if its in there, could that be the reason why I found my 575 to be floaty because the installed ECU was not doing its job due to the fact it should not be working in my 575?

Since I posted the above it was pointed out to me from a separate thread on a different site that 201674 works on all early 575Ms through AN 52556, so I'm ok.

tazandjan 05-26-2014 10:45 AM

Clyde- No, that shock ECU should work with all early 575Ms. See you discovered that.

tifosi_ 05-26-2014 01:19 PM


Originally Posted by tazandjan (Post 422777)
Clyde- No, that shock ECU should work with all early 575Ms. See you discovered that.

Yes, once again thanks to your postings Terry,

tazandjan 05-26-2014 05:31 PM

Alex- Make sure and watch carefully for tire wear.

tifosi_ 05-28-2014 08:09 AM

Last night Alex was kind enough to install the new Steering ECU (thanks again Alex) I had just received from Maranello Skunkworks (thanks John), and though I didn't have time to take it on a long drive, I did about 60 kms (37 miles) on the highway with it right after the install to work it in. I must say that at first at slow city street speeds I barely noticed any difference at all between the stock ECU and the MSW unit, but it only seemed to kick in or I only really started to fell the difference when the speed increased to around 80 kph and above (50 mph and above). At highway speeds between 120 to 150 kph (75 and 100 mph) I definitely had more feel but in no way did it feel heavy as John worried that it would (so that's good news John). It just had a little more resistance than normal. Its only when I got back into the city and I slowed down to about 60 Kph (40 mph) again before parking it in my garage that I had a moment or two where it felt heavier or more resistant than I expected. I'll have to test it more when I return from overseas but my first impressions are generally very positive with it installed.

cribbj 05-28-2014 05:07 PM

Clyde glad it felt fine for you. Interestingly, it's only Dave & myself who felt the steering was too heavy with the FHP steering ECU, which is why Dave developed the switchable harnesses, and I became interested in hacking the ECU further and putting in custom curves.

Some, such as FBB, even prefer the feel of the steering with NO steering ECU installed, (ie with NO boost whatsoever.)

I'm beginning to wonder if the preload adjustment on all our racks is set differently, which would change the steering effort, and make some racks feel much heavier.

That, and the caster/camber settings, and the size/type of tire are about the only adjustments I can think of that would change the steering feel from car to car.

tazandjan 05-28-2014 08:48 PM

John- I think you misread FBB's post. What he actually said was that he preferred the normal steering ECU to the FHP ECU because, when racing, the lighter the steering, the better.

The power steering belts and tensioners are different between the 550 and 575/612. Otherwise, everything looks pretty much the same. Not much difference in alignment specs for the Maranellos, either. It may just be what you are used to. The steering position sensor will slightly change steering feel, too, as it stiffens the outside corner as you turn the wheel. Probably why the HGTC 575Ms came with the standard steering ECU and not the FHP ECU.

cribbj 05-29-2014 12:19 AM

Taz, as Dave, Carl & I were prototyping & testing the switchable harnesses, this is what he wrote me by normal email:

"So as test I pulled my ecu out. I ran the car a few miles going up to about 60mph around town. I did not have much time. I got no codes. The steering feels great without the stock ecu. It feels like a 348 in a parking lot maybe a bit less assisted than that. Quick auto-x type turns at low speed are great. I could not do any high speed turns. I think the car runs awesome with no steering ecu."

He had previously complained about his steering being too light and vague, and I (think I) recall him mentioning it became this way after his rack was overhauled. This is what led me to make the comment about the rack preload adjustment.

tazandjan 05-29-2014 12:24 PM

John- This is what I was referring to from FBB:

Call me crazy but I have 2 550's and the steering is different on both. Both have the Maranello Skunkworks switchable steering ECU's. I actually like the super light steering for the track because power steering is power steering it may as well be light precise and not tire you out. If it was manual rack and pinion that's a different story. Racing is hard work. Light steering is an advantage as is a butter light clutch.

wysri9 08-01-2014 03:31 AM

Shock ECU on eBay in UK etc.
ECU for standard suspension fitted to Ferrari 575 and SuperAmerica.

Ferrari part number - 210577

Ferrari 575 / SuperAmerica Suspension ECU | eBay

I just fitted (finally!) ECU 210578 to my 2003 575 (Assy No 49620)

As promised by Taz Suspension warning comes up (no steering position sensor) but otherwise works like a charm. Will give it an extended test this weekend, however initial impressions are very positive. The porpoising over bumps has gone. Much tighter overall with much better roll control. Ride feels a little hard particularly at lower speeds, and tramlining seems to have increased.

More to come after our weekend drive - three of us doing 180 miles up to Applecross for a seafood lunch!

Check out the route :- Bing Maps - Driving Directions, Traffic and Road Conditions


tazandjan 08-01-2014 04:45 PM

Simon- Someone makes a shunt to prevent that light from illuminating, KW, I think, for the Novitec suspension, but if you use it there will likely be no warnings on any suspension malfunction.

That ECU is looking for a steering sensor input, and our older 575Ms do not have that. Some genius may be able to fake that input. A new wiring harness was fitted up front and in back at AN 52556.

tifosi_ 08-26-2014 12:44 PM

1 Attachment(s)
Hi All, I just received this email from someone who is most probably a FerrariLife member (or from the other forum), and since I am not completely qualified to answer all his questions (other than the fact that the 575M Shock ECU 197211 that I am selling is unused), I thought I would post his email here to see if anyone (Terry?) would like to respond with more detailed information:
I am extremely interested in improving the roll and pitch of my 2002 575.
I have been looking up the ECU numbers and I am quite confused.
Can you please tell me when this particular one was introduced?
Would it work on my early 2002 model?
Is it a used part? If yes, is there anything I should know as a buyer like malfunction, how long has it been on a car, etc?
Also I have attached a picture that shows your par number and below it says FHP, hence more confusion. Is this the one you are selling?
Thanks for your help. I am very seriously interested.
Philippe Dorier"

tifosi_ 08-26-2014 12:53 PM

Thanks for your separate answer Terry! :)

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