Hey guys my e55 amg is heavily modified, I just switched from e85 back to 93 octane on a tune by Iqperformance.
when I go full throttle it will bog pretty bad and the air to fuel will shoot to about 19!
anyone know anything about this?

 

Call Tony but sounds like it did not switch back to the other Map tune.

 

Sounds like you got a fuel issue not your tune .pumps could be failing or some sort along with low pressure .Car might pop soon if not fixed ..what's your mods ?

 

the car might pop? I am not driving it! Just trying to get the issue figured out it is running lean around 14-13 on full throttle.

mods include:
2005 Mercedes E55 AMG
630whp/680wtq
High compression engine (10k miles or so)
- CL500 block, ML55 pistons, E55 (k) crank/rods
- ARP rod bolts
- “Stage 2” ported heads
- ARP head studs
- SL500 oil pump
Built transmission
- Alto Red Eagle clutches K1, K2, K3, B2
- Kolene Steels K1, K2, K3, B2
- Alto Clutches B1, B3
- Alto Steels B1, B3
- F1 & F2 Freewheel Clutches
- Machined Pistons K1, K3
- Brand new conductor plate, filter, connector
MBH longtube headers
82mm throttle body
180mm ASP crank pulley (triple pinned)
83mm UPD supercharger pulley
UPD belt wrap kit
ID1000 injectors
AEM 320 fuel pumps
Custom billet fuel hat (40amp capable)
E85 tune (RaceIQ/Anthony Lawshee)
3” stainless midpipe with magnaflow muffler, all cats and res deleted, stock mufflers
Eurocharged heat exchanger
5 gallon trunk tank with ¾” line, Seaflo bilge pump
Coolingmist meth/water injection, single CM7 after intercooler
Zeitronix ZT-2 datalogging with ZR-2 multi gauge

 

This setup looks like that roc the mullet character was selling ..


Exactly, your Lean and can pop that engine .

 

It was sold to me by SICAMG!
no check engine lights the whole car checks out. Didn't pull any codes either.
maybe it's jut the lean issue doing it?

 

It was sold to me by SICAMG!
no check engine lights the whole car checks out. Didn't pull any codes either.
maybe it's jut the lean issue doing it?

 

Why going back to gas from E85 ?

 

I want better gas mileage so I can drive the vehicle more! I'm not worried about the minor power loss. Plus the fuel system is not totally up to or for e85

 

Get a hold of the tuner.

If you went from a tune for E85 and were able to pump enough E85 to maintain good AFRs to a tune for pump gas and can not maintain AFR the tune is the place to look.

 

The afr was lean on e85 as well

 

Oh okay gotcha. I don't know if torque or the EC software has it, but I'd log injector duty cycle when you hit that lean condition. Fuel pressure at the rails would be good to check also but a bit harder to check under load. Unless you happen to have a transducer in your fuel system hooked to a gauge reading in the cab? Otherwise a mechanical gauge under the hood but you'd prob have to get it on the dyno to check ti under load, and see what your fuel pressure is doing. Or zip tie a go pro in front of it for one pull haha.

What fuel pressure are you running, and do you have an adjustable fuel pressure regulator? I'd try to see if fuel pressure is steady, and if injector duty cycle isn't maxed, then make sure to communicate all of that to your tuner and tell him to give you some more fuel. If duty is maxed and fuel pressure is good you're out of fuel! Gotta lower the boost or get bigger injectors, or if you have an adjustable FPR you might be able to increase pressure depending on what it's at, and communicate that to your tuner and get a retune.

Anyways, just spit balling the kind of stuff I'd be looking at.

 

Okay thank you so much all very good info! The dealer checked the pressure but not under load... my tuner is trying to fix it but my ECU isn't giving me data when I try to read data this come up
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That is all that shows, no acual data so now we have that issue so he can't properly read it and tune it.