FBM Tuning fixed my issue, FA20 and Visconti didn't work as well

[Sportsguy83]

Originally Posted by mad_sb

So, I know you really want your car sorted out man, it has been a long frustrating road i am sure. But it is not "fixed". It may run ok under boost but you still have serious fuel trim issues at idle and cruise.

You mentioned it has always idled at 900 rpm since the turbo install and stated some other turbo's were seeing the same idle.. i guess that is normal... However, i see no reason in the world why that should be normal but if some others can chime in and that does turn out to be normal... you can cross that off the list of symptoms.

As i said from the begining, your car, your money, your choice. If your happy with the car now that great but please be aware you still have some issues to sort out and please keep an eye on your data logs for the sake of your motor.

Usually John raises idle to 900 rpm to deal with RPM drops from LW Flywheel, LW crank pulley and A/C compressor also bringing RPM's down.

But I still feel the fuel trims are weird, or at least very different than mines on certain conditions.

[Frs300]

@mad_sb damn you said all that as i was typing. i was going to say i think he still has issues related to di as well because after he replaced the di he got another cel dont remember which one but they are all closely related.

I think LJ tune got his FI up and running better but i think he should have stuck with tony to get the real issue fixed and not just covered up

[xxscaxx]

Originally Posted by whitefrs

Gotcha

Sorry for misunderstanding

no need to apologize man, just wanted to state that I wasn't trying to attack you or anything

[tech4pdx]

Thank you all for this great read.

[King Tut]

Originally Posted by Sportsguy83

Usually John raises idle to 900 rpm to deal with RPM drops from LW Flywheel, LW crank pulley and A/C compressor also bringing RPM's down.

But I still feel the fuel trims are weird, or at least very different than mines on certain conditions.

Yep. Mine idled at 900 RPM on both LJ's basemap and my Visconti tune. He sent me some datalogs, so I will take a look at them when I get home as well. One thing to note is that last LJ and Visconi use different methods of tuning the fueling.

[whitefrs]

Originally Posted by Sportsguy83

Usually John raises idle to 900 rpm to deal with RPM drops from LW Flywheel, LW crank pulley and A/C compressor also bringing RPM's down.

But I still feel the fuel trims are weird, or at least very different than mines on certain conditions.

Can any one share their Fuel Trims?

[mad_sb]

Originally Posted by King Tut

Yep. Mine idled at 900 RPM on both LJ's basemap and my Visconti tune. He sent me some datalogs, so I will take a look at them when I get home as well. One thing to note is that last LJ and Visconi use different methods of tuning the fueling.

Yep, LJ still uses the DI's, most tuners (or at least many) use port only on turbo kits from what i saw in his logs anyway.

[Frs300]

Originally Posted by mad_sb

Yep, LJ still uses the DI's, most tuners (or at least many) use port only on turbo kits from what i saw in his logs anyway.

which goes back to my statement to him having di issues still

[whitefrs]

Originally Posted by mad_sb

Yep, LJ still uses the DI's, most tuners (or at least many) use port only on turbo kits from what i saw in his logs anyway.

Visconti uses Port Only

Tony and LJ both use Port and DI

[mad_sb]

Originally Posted by Frs300

which goes back to my statement to him having di issues still

Even when running 100% port the trims were still -30 at idle. I agree he may still have an issue with the DI system, or the work that was done may have introduced a new problem but the fueling issue is not limited to DI.

Personally I think his in tank FPR got hosed during the pump install or re install, but others have stated that seems unlikely to happen. Maf could also be hosed up but i believe he has cleaned it a few times.... It's possible the placement is off a bit causing crazy maf swings.

Rename these txt files to CSV to see the current idle and cruise data

[whitefrs]

Originally Posted by Frs300

which goes back to my statement to him having di issues still

Wouldnt my car misfire if i had that issue?

I dont have any misfires nor CEL

The only CEL i had was p0068
Rough Idle at Cold Start

[FullBlown]

Without getting too in depth about what we do and why we do it...

There is a reason why direct injection was used on this motor. Why disable something that helps prevent knock?

These cars are a little tricky to tune with a turbo. If you take direct injection off a 12.5:1 compression motor and put a turbo on it with pump gas.... I guess you can figure out the rest.

We sent Will 3 maybe 4 maps. His car is running a lot better than it had but we are not done.

[mad_sb]

Originally Posted by whitefrs

Wouldnt my car misfire if i had that issue?

I dont have any misfires nor CEL

The only CEL i had was p0068
Rough Idle at Cold Start

P0068 MAP / MAF - Throttle Position Correlation


DTC DETECTION CONDITION
One of the following conditions is met (2 trip detection logic):

Manifold absolute pressure sensor voltage is less
than 1.25 V for 5 seconds or more when throttle
position is 10° or more.
Manifold absolute pressure sensor voltage is more
than 3.3 V for 10 seconds or more when throttle
position is less than 5.13°.

TROUBLE AREA
Open or short in
manifold absolute
pressure sensor
circuit
Manifold absolute
pressure sensor
ECM

[Gen]

Originally Posted by whitefrs

Can any one share their Fuel Trims?

Whatcha lookin for? Cruising, idle, WOT?