I am pretty sure that Tom thinks the current tune should be running pig Rich.

 

How old is your wideband sensor?

 

The wideband sensor is about 6 months old.

 

What power level is it currently at? Does the fuel pressure drop off from 75psi once the second pump kicks on or does it fall off? You said you recorded it..

 

The car has enough power to break the wheels loose in 2nd gear, but not consistently. I'm guessing its probably 350-400 WHP with a big abrupt torque spike and then dying off.
The fuel pressure looks like its not dropping off at all when the car is in boost but then again its only for a split second until you are around 6k rpms.

The video we recorded doesn't let you see the rpm and fuel pressure at the same time because the cell phone was mounted under the hood to record the fuel pressure (where the guage is)....

 

Try adding fuel, see what happens. increase the RPM VE where its going lean..

 

The car no matter how rich you make the rom, it will go leaner the higher RPM it climbs. No value in the map or scaling will change the climbing lean curve.

You can run the slope DOWN on the fuel map to redline (opposite of what you do on a healthy fuel system) and it still climbs leaner the higher RPM it goes.

I appreciate everyone helping my customer, just be sure to KNOW it has zero to do with the tune.

I made him a test rom that has extremely rich values to the point the car should be flooded & RPM cut at 5500RPM, thats why you see one of the pulls pegging full rich, but then it still climbs lean even with that rom until he hits my rev limiter, which i added to save him from melting his pistons if indeed it is that lean of mixture.

Im also pretty sure I told him to pull the wideband sensor and wrap it in a rag of brake cleaner / wd40 to see if it sits at 10 flat. Whether he did that yet or not im not sure.




instead of a log, heres a visual of the afr curve for you guys to see. Keep throwing out mechanical things to check & ill ask a few more things regarding his fuel system in email.

ADD: The other tuner he mentioned also wants to sell him an AEM EMS and doesn't even know how to tune the stock ecu, so go figure he blames it on the ECU.

 

Swapping the second 255 with a different one would be my next step

 

2nd pump might not be triggering with the pressure switch. If we cant fix it remote, I'm gonna have them drive it down to my shop and we will fix it there.

I'll be sure he updates the thread or me with what resolved it also for future for other forum members to learn from or reference off of.

 

OP said he did a pull with a camera on the fuel pressure gauge and it holds 75psi. which is actually a bit high. Fuel should go up 1-1 with boost. Netting about 65-70psi based on his base fuel pressure. Something else isn't right...

 

Fuel pressure working properly has nothing to do with a 2nd fuel pump activating or not. It will go 1:1 regardless assuming there is at least one working pump in the system.

That doesn't assure me the 2nd pump is turning on. The only thing that will assure me the 2nd pump is turning on, is pressure directed to the pressure switch and listening to it trigger the fuel pump on. Preferably a boost leak test to assure nothing else is clogged in the vac line going to the pressure switch itself etc.

 

Thanks for coming in and posting Tom.

Tom is pretty much on point with what he has said so far. I am confused because another tuner mentioned that the car will not run properly on Speed Density and the stock ECU; and the car will always have issues running stock ecu with speed density.

I don't think the ECU is the problem; but I was wondering if the AEM might have more control over the engine than the stock ecu even with speed density?

Maybe it would be easier to tune it?

He must have had some reason say this; however there are way too many people running speed density and stock ecu for it to be impossible to tune it speed density and stock ecu(according to my logic). But then again you guys can correct me if I am wrong.

 

The other tuner is trying to sell you AEM EMS, and the other tuner doesn't know how to tune the stock ecu on speed density so of course hes going to dog it.

Don't pay stuff like that any mind. He also said the 3 port has no benefit in a evo and hes dead wrong.

Tell how being able to control boost per gear, ramp boost at a certain rpm, or just in general have full CLOSED LOOP control over a boost curve is not beneficial over a MBC that has no choice but to act open loop with no gear based, rpm based, etc control.

I can tune AEM also, and have retuned very reputable tuners work on dozens of occasion's and there's not a damn thing in the AEM that will magically fix your AFR issue.

You have a mechanical issue its not ECU related. I am one of the most pickiest people you will ever meet as far as driveability goes on these cars, and if the stock ecu wasn't capable of driving like stock even with my big setup it wouldn't be on my car anymore.

Some things you need to let go out one ear and out the next.

 

Not to mention Rich, I just found out by your cousin that you are leaving the car full of boost leaks, and the car was never boost leak tested.

The car cannot be tuned with boost leaks, holes in the FMIC , or in general anything of that nature.

Boost leaks depending how severe can cause LEAN and RICH conditions. They also cause the turbo to work harder, in turn blowing hotter less efficient air, and just in general no car should ever be tuned with boost leaks.

This isn't a honda (I know you had one before the evo). 20psi is very very low boost for these cars, especially on E85. You popping couplers off when running 27psi is not ok. Your cousin is telling me you think its ok to just lower the boost and tune the car with boost leaks at 20psi on E85. No that is not ok, and thats not how these cars work.

So to this day the vehicle has never been leak tested, just to throw that out for others to know that posted in this thread. It sounds like to me its a very neglected car and needs a lot of care.

 

There are no holes in any of the piping or intercooler.
He said there was a dent on the intercooler because it bottomed out before.