SoCal55k

For about 2 weeks now I have been running an 80mm FSP on my daily driver. The first tune Jerry gave me I ran for about a week but was having a hard time adapting to the "2000 RPM" glitch as Jerry called it. Around the 1800-2200 RPM range the ECU would add a lot of timing in momentarily expecting the supercharger clutch to engage, this would cause the car to have a power loss that was very noticeable and severe depending on throttle input. Also first gear was almost unusable driving around town, comfort mode was what I had to leave the car in.

After emailing Jerry and discussing my issues he sent me his latest and greatest FSP tune and I have to say after 5 days of daily driving, this tune is amazing! The 2000 RPM glitch is all but gone now, If you didn't know to look for it you wouldn't feel it. 1st gear behaves as normal and drivability around town is now on par with a stock E55. As an added bonus part of this tune included changes being made on how the bypass valve operates so I still have that instant power but cursing around my IATs are 15-25 degrees above ambient (IATs with the first tune were 30-35 above ambient cruising)

If you are considering an FSP for your car I can say that I would highly recommend Jerry's latest tune.

uraberg

This is good news. Last email I got from Jerry indicated that he wasn't positive about fixing the 2k rpm glitch.

Ls1toAMG

Great news. A reliable pulley and tune for these cars is what we need. Hopefully this is the combo.

Moosepuck

Excellent news, thanks for sharing! I hope they ship my FSP to me soon!

B Feelgood

Good to hear! You are running the 80mm FSP with no clutch, stock fueling system, and no cooling upgrades, correct?

SoCal55k

That is correct. No clutch and fuel and cooling is stock for now.

menace2sobriety

Your keen on the stock cooling with a FSP, my E55 with stock cooling was struggling to even handle summer here on a stock motor with high cruise IAT's @125° at 95° Ambient

Have you been logging, is it winter where you are?

Have you had it on a dyno

Also is the 1800-2000rpm glitch evident on all of the FSP's? - I'll be getting the 77mm, stock but I have upgraded the cooling

How does it drive now, is it an animal

Best of luck mate, cheers

99lightning

every car is different my buddies fsp car did not have issues other then limp mode once in a while but that was fixed with a tune adjustment. he has 77mm fixed and compared to a 84mm clutched car there was only 5 deg difference in rise in aircharge temp. enjoy the fixed pulley kids.

SoCal55k

Yes I have been logging since the car was stock. It is winter here in socal so that means the temps are around 75 degrees Fahrenheit, my crusing temps at 75 are always around 96 with the new tune. Adjusting the bypass valve has been a game changer regarding IATs.

No dyno yet but at 3000 rpm is when I can really feel the power differance.

shardul

iTrader: (1)

77mm and 89mm in stock
Will have 74mm by the weekend

B Feelgood

Any ETA on the 80mm or that an EC exclusive size?

SICAMG

Oh my goad!!!! Its winter and your temperatures are 75 degrees? I am looking at my thermometer and shes holdin steady at a "cool" 19 degrees. Can I come over to your house? LOL

berti_00

Is the fuse still necessary to be relocated I in the cabin or it's fine where it is

uraberg

I assume you mean "resistor"? I'm guessing the resistor is just there to tell the ECU that the clutch is engaged. It is on/off, (high resistance/low resistance). I would venture to guess that it doesn't matter where the resistor sits, as long as the temperature does not cause it to change resistance so that it is detected as "clutch not engaged". (if the resistor is properly chosen, then this should not be a problem.)

off course I could be talking out of my backside, since I am just speculating.

berti_00

Sorry yes that was what I meant

SoCal55k

No, it does not need to be relocated. It is plugged in to the harness on the engine.

romeomikehotel

Any big changes in mpg outside of punching it a little more often? Would you see any issues daily driving the car if your job involved a lot of driving throughout the day?

Thanks

SoCal55k

I have actually spent this last week paying close attention to the way I drive and making sure I drove the same way I did pre pulley swap. What I found is the mileage difference is very small, previous I would average 18.5-18.7 MPG per tank this week I averaged 18.4 MPG per tank. Also I would see no issues driving a lot, I average 60 miles per day but somedays can be double that with multiple stops. I have noticed no difference in the car driving that way since the pulley swap.

romeomikehotel

Thanks I really appreciate the feedback
I think I'll pull the trigger in the next few weeks.

Ls1toAMG

My concern with the FSP is the supercharger is working all the time. Yes I'm a newbie to e55's but common sense will tell us the stress on the long block and supercharger at idle and low Rpms and under low load will increase dramatically. If the car is general transportation or you drive people around for work or even the family car I would not go that direction. If you drive it hard want HP all the time/ street race weekly then it's a good option. imo the best all around pulley is a crankshaft pulley. They made the e55 legendary. All pulleys have their risks downfalls etc.

Crissus

It is very nice to hear that the tune is getting better and better.
What issues do remain now? What about the so called "cold start issue", where one has to be on key position 2 (IIRC) for a couple of seconds (or minutes?) before he can start the car?
Maybe Jerry can close the bypass flap a bit during idle, to get rid of the rattling sound the blower produces at low RPM? :-)

SoCal55k

I have not experienced that cold start issue with either the first tune or the last one form Jerry. Honestly, I don't find the rattle to be that big of a deal to myself. Between the quietness of the cab and the noise of the exhaust I don't even hear it.

BC928

I think people are fundamentally misunderstanding some issues.

MB is one of the few manufacturers that put out an sc WITH a clutch. Most do not use a clutch and just bypass at idle.

Removing the clutch is not going to create a huge amount of stress in the motor.

In relative nature, what kind of stress do you think it is to rev to 2k and hit the clutch on the sc all of a sudden?

Increase cooling if you are concerned. Its not like most here are *driving* like they are concerned over engine stress.



I'll say again. Strange Forum. Other than a few, a complete lack of fundamental mechanical understanding irritatingly mixed in with people who re-re-repeat crap they read other people write/say. A dangerous concoction to mix with most people not doing their own work and then repeating what the mechanic mumbled when taking the CC.

Play through.

DavidRobinson

Sounds like I can get a pulley and tune this is great!!! I want to thank all the guys that have done the research and got this figured out. Not all of us have the funds to do that.. We all benefit from it though.

Elhonaz

To me its just the rattle at idle.. if that gets somehow fixed then im all in on this. I just hate all the noise that dont "belong" there as engine is running, but thats just me