08 HEMI 5.7 TURBO tuning issue. no power at WOT fine at part throttle AF good

[colin7761]

0280298598 injectors. It seems that as soon as it gets into WOT there is no power, it slowly continues to climb in rpm but something is limiting it.
if i drive it in part throttle conditions it drives good but as soon as WOT hits it falls on its face. what could it be?
i included the current tune file if anyone knows a thing or two about hemis. thanks for your help!
heres a vid : https://youtu.be/9rEmY4WreYw

[JD40]

post a log

[jefo]

A couple of things:
-Engine rev limiter should be at least 200rpm above the TCM RPM Limit. Your Engine rev limiter is at 5800rpm, and TCM RPM limit is 6000rpm.
-Raise Torque limits under Trans Torque Management - Your engine limit is the stock 443lb-ft.

[f.creek-ranch]

Thing I would change :
sensed map - off
ramp rate - not max out
Driver Demand - set wot pedal the same as Pedal wot pedal tresh

Engine Diag
Raise Torque Correlation Data

Just dont know max map for the 2 Bar sensor, but wont get over 200kpa.

Good Luck

[colin7761]

Thanks for your help guys i appreciate it. I've made some changes to the tune, but unfortunately cant go for a test drive until tomorrow. Tomorrow I'll see what happens and run a log. thanks!

[jefo]

I put together a modified version of your engine/trans CAL that should make it a bit better. Review the changes before running of course, and make sure AFR's are still good at WOT (Since sensed MAP is now disabled).

-Engine fuel/timing mapped to 200kpa instead of just 180kpa; No change to WOT timing or fueling - except at 6krpm; part throttle timing at 105kpa lowered by 10 deg - boost at stoich part throttle and lots of timing is no bueno
-Trans cal fully reworked - should shift quick and at ~5800rpm
-A bunch or other little changes

Was this a remote tune I'm guessing?

[veeefour]

A couple of things:
-Engine rev limiter should be at least 200rpm above the TCM RPM Limit. Your Engine rev limiter is at 5800rpm, and TCM RPM limit is 6000rpm.

Not really, exactly the other way around

[colin7761]

08 Charger 5.7 Turbo newest file.hptmost recent 5.7 turbo.hplrt turbo wot issue.hpl

all right! i was able to go for a test drive, it still has no power when going WOT. I've attached the current tune and also two logs. I appreciate your time. Thanks to those of you who have had some suggestions, i have changed some settings around and i still have the same issue.

[colin7761]

@jefo I tried and its still doing the same thing, as soon as I go WOT it feels like the engine is cutting power and the turbo wont spool, if i go slowly into it as rpm goes up, the turbo spools up until i give it more gas then it cuts power again. Have you ever had a similar issue?

[colin7761]

I've also posted a video to show what's happening, note: at the beginning after turning, i apply WOT and it does that. Thanks for your help!


https://youtu.be/9rEmY4WreYw

[edcmat-l1]

It's not making any boost. Never goes over about 100 Kpa. Actually drops off as you keep the throttle wide open.

I had a twin turbo Camaro come in years ago same problem. Turned out the turbos were seized up. Might want to verify that, and then check for boost leaks.

[colin7761]

I think it won't make boost because something is cutting power to the engine. did you see the video? it downshifts to go and its like the engine is in limp mode. turbo starts to spool then engine power cut and turbo stops spooling., thanks for your help bro.

[edcmat-l1]

I think it won't make boost because something is cutting power to the engine. did you see the video? it downshifts to go and its like the engine is in limp mode. turbo starts to spool then engine power cut and turbo stops spooling., thanks for your help bro.

Unless you're logging incorrect pids, the throttle blade is wide open, it looks like you have enough fuel and the spark timing is in the mid teens. That's about all you need to know.

In your log the MAP pressure drops below 90 Kpa at WOT which would suggest there's an actual obstruction in the intake as opposed to a boost leak, where if that were the case you'd most likely see SOME boost before it falls off.

I'd be checking all your piping, check your turbos, make sure they spin freely, etc.

no boost.jpg

[edcmat-l1]

The more I look at that data log the more it looks to me like the turbo is seized. The MAP pressure peaks at 98 Kpa at 3100 rpm and then falls off pretty quick and hard and continues to drop as long as you're WOT. The way the MAP pressure drops resembles an exhaust restriction. Like a turbo that won't spin.

It would also, definitely feel like something is "holding it back".

[coanan]

0280298598 injectors. It seems that as soon as it gets into WOT there is no power, it slowly continues to climb in rpm but something is limiting it.
if i drive it in part throttle conditions it drives good but as soon as WOT hits it falls on its face. what could it be?
i included the current tune file if anyone knows a thing or two about hemis. thanks for your help!
heres a vid : https://youtu.be/9rEmY4WreYw

Set MAX MAP in Eng diagnostics to 200

[colin7761]

i appreciate your help bro, is it possible an intercooler 90 elbow is collapsing on itself in the intercooler piping?

[edcmat-l1]

Set MAX MAP in Eng diagnostics to 200

Has nothing to do with the current problem. He isn't even exceeding 100 Kpa.

i appreciate your help bro, is it possible an intercooler 90 elbow is collapsing on itself in the intercooler piping?

A silicone elbow isn't going to collapse on itself when you're trying to go into boost. The added pressure should keep it from collapsing. Now, if it's already collapsed, pinched real bad, etc. that would be different.

Need to go check the vehicle over real well. Start by making sure the turbo wheel spins freely. Something is acting like a big plug in the system.

[colin7761]

The turbo is spinning. I appreciate everyones help! I think i found the issue, it appears the intercooler piping is restricting the flow, some of the 90s were collapsing. I ran a test drive without the IC piping attached to throttle body and this time, there was no power loss. So thanks for the help!

[jefo]

That is good news, you could try shoving a cut piece of leftover intercooler pipe into the bends to support them from collapsing to test it (not the bend in front of the TB of course, don't want it sucked in). It looks like you have 2.5" piping and a honda size intercooler - not ideal but should still work; 3" IC piping and a 31"x12"x3" intercooler would work better.

You should definitely hook up a boost leak tester @ ~10psi to the turbo inlet and check/fix leaks. The EGR valve will leak, and the EGR tube to the intake manifold seal will leak. I RTV'd the tube to intake manifold seal, and cut off/crushed/welded the tube portion that enters the intake manifold to eliminate leaks. Also, you will probably want to gap the plugs down from stock to ~.025 or .030 to prevent misfires.

I attached a revised file mapped out to 2.2Bar just in case of overboost, as I didn't see you had a 2.25bar MAP sensor, and just minor other tweaks but everything looks pretty dialed in. Just check the edits of course, and definitely monitor AFR.


What size turbo is on it?

[Koutlaw]

I put together a modified version of your engine/trans CAL that should make it a bit better. Review the changes before running of course, and make sure AFR's are still good at WOT (Since sensed MAP is now disabled).

-Engine fuel/timing mapped to 200kpa instead of just 180kpa; No change to WOT timing or fueling - except at 6krpm; part throttle timing at 105kpa lowered by 10 deg - boost at stoich part throttle and lots of timing is no bueno
-Trans cal fully reworked - should shift quick and at ~5800rpm
-A bunch or other little changes

Was this a remote tune I'm guessing?

So you turn sensed map off completely? What is the advantage of it off vs on?