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2004 W211 E55 AMG >>gone but not forgotten > W123 280E > W124 E280 > W126 380SE
Since installing a 180mm crank pulley I have been experiencing some issues and thought it felt like a fuel delivery problem. When I purchased my E55 the injectors had only just been replaced and upgraded - or so I was led to believe - but upon checking the symptoms I am guessing that they were just replaced with original flow injectors. (It doesn't surprise me considering how dodgy the seller turned out to be....) I will have a look today to confirm and assuming I'm right will replace ASAP.
Most importantly though it appears as though the stock injectors cannot handle the 500 or so RWHP from my car and this seems to correlate with the figures below.
While researching injectors I came across this handy Fuel Injector Calculator which determines suggested injector size for a specified horsepower. Aside from indicating our cars need immediate injector upgrading it seems a little overprotective to me plus I'm assuming they are actually referring to RWHP rather than flywheel? Am I reading it wrong - can someone more knowledgeable set me straight?
I have included a couple of screenshots from the Fuel Injector Calculator; the first is for a stock E55 at 469HP the second is my vehicle with current mods:
2004 W211 E55 AMG >>gone but not forgotten > W123 280E > W124 E280 > W126 380SE
Originally Posted by Hulk
What are your AFRs on a 3rd gear pull?
Dashdaq is saying N/A for the AFR? Unsure why no reading there? The boost seems way down (not sure how accurate Dashdaq is there?) as it travels between -11 and -2. Timing also seemed really lean if I recall showing readings between -30 and -10 (roughly: those numbers could be out).
I did actually put some injector cleaner in and for what it's worth it appeared to make an immediate difference.
You need the zt2 to read afr, it connects to the dashdaq, highest boost will be seen in 3rd gear on road test. You don't have the proper logging equipment to know if you are going lean
2004 W211 E55 AMG >>gone but not forgotten > W123 280E > W124 E280 > W126 380SE
Originally Posted by Hulk
Hard to say without seeing afr, timing, but I do know that Jerry's box tunes are pretty good
Did I forget to mention it hasn't been re-tuned since the 84 sc pulley came out and the 180 cp went in. Lot's of dramas over the last couple of months...
2004 W211 E55 AMG >>gone but not forgotten > W123 280E > W124 E280 > W126 380SE
Ya I did speak to Philip about 8 weeks back. I'm in Australia so planned on sending it with the cable. With the ec tune, the 84 sc pulley and other mods the car went like a rocket and when we dropped the 180 cp initially the pull was insane - felt like the car wanted to pull itself apart but power has gradually declined and circumstances have hampered repairs progress. So frustrating - especially with other issues that I attended to and was uncertain if they were related. It is only now that I have determined it is fuel related. And all along I have not had access to star das.
2004 W211 E55 AMG >>gone but not forgotten > W123 280E > W124 E280 > W126 380SE
Originally Posted by Hulk
It's not fuel related, the ecu is dumping excess boost bro. The bpv is opening up bleed excess boost, safety precaution.
To that degree? I'm talking halved in power over 6-8 weeks and generally running bad with surges etc. Feels like I shouldn't be driving it anymore which is what I decided till it was back to where it should be. The motor still sounds smooth enough though - in that noisy E55 kind of way.
So if you reckon it's just the tune can I get away without upgrading the injectors yet or are they pretty much essential at this point also? Certainly that calculator to my reasoning says it is, although I know what the experts in this forum say also - what is your opinion on the calculator? It looks right and I have seen the same formula on a couple of sites, I just don't get why the injector capacities recommended should differ from what I read and know people to use?
Yes the ecu will bleed off excess boost, there's a thread in here from sneakyneon from awhile back that his logs actually proved it, your car is running bad right now and I suggest getting a tune before you drive it hard again
2004 W211 E55 AMG >>gone but not forgotten > W123 280E > W124 E280 > W126 380SE
Originally Posted by Hulk
Yes the ecu will bleed off excess boost, there's a thread in here from sneakyneon from awhile back that his logs actually proved it, your car is running bad right now and I suggest getting a tune before you drive it hard again
Originally Posted by Joncl
sneakyneon did numerous 1/4 mile passes with a pulley with no tune and has logs to prove that the ecu was bleeding off the boost by opening the bypass valve
It's not recommended to do but it's unlikely you will blow up the motor as the stock ecu has fail safes and runs rich from factory
Still has me concerned since the car already has an ec tune then it's no longer the stock ecu - could this mean the failsafes may no longer be there also? Was sneakyneon's decline in power gradual? I did attempt to find his post but had no luck.
Sorry for sounding pedantic and worried but it is my baby we're talking about!
Last edited by TheTherapist; Nov 16, 2014 at 12:21 PM.
Thanks for the response, Brooke. I am already running 550cc injectors, have been for over 3 years now Would love to log IDC% with the dashdaq, but I don't believe there is a PID for it.
and dont forget about the factory "blue" injectors that were phased in sometime around mid 2005 production. they have higher cc but i forget what it ended up being. there were a few arguments about it in other threads but they do actually have higher cc i think in the low 500's
550cc and looped rail is more than enough when you are approaching 500rwhp and above. 650cc is good to but once you go above 700cc, if they are not ID or equivalent high end squirtters, you will start to have drivability issues.
I was on 1000cc inj for e85, and drivability suffered.
tell me more about the e85 setup! all the local FL guys say it cant be done, but I would think that the e55 setup would benefit double from E85.
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Would love to log IDC% with the dashdaq, but I don't believe there is a PID for it.
