lt1 gen v Throttle not opening 100% issue

[malek779]

Hello,
been chasing my tale here for the last couple weeks, i have an lt1 gen5 with a cam swap dod and vvt delete , after swap i was having issues with torque management retarding timing and shutting the throttle. after a couple adjustments i was able to figure out the timing issue and the engine runs decent, after logging a couple times we noticed that throttle is only opening 60%, no matter what i change in the virtual toq tables it still opens only 60%, i think the problem is form the max engine torque values. it looks like every time my cmd and actual torque goes over the max, which might be causing this issue , what table is the one that controls max eng trq? i already have the peak tq figured out. thank you in advance.
farouk map 1.2 virtual torque adjsuted (1).hpt21-11-25 16-56-29.hpl

[A_Texas90]

Same issue on and off even replaced the throttle body still if I command 100% my throttles 73-74% open no luck tried driver demand-virtual torque-limits set to 100%, peak torque stock to wild, does it in maF only or with SD enabled. On a L83 DOD deleted, decent cam, L86 manifold and throttle, FB0. Following

[sevinn]

Your VVE table could have been the issue, this definitely isn't perfect and I'd work on dialing it in some more but give this a shot. Your "max torque" reporting was below your engine torque reporting. These changes to VVE should work on correcting that but may not be quite there yet.


farouk map 1.2 virtual torque adjsuted (1)_try.hpt

[lt1z350]

The VVe is a major player when comes to max torque calculation. Go into the vve editor go to the area that the throttle is not opening and reduce the table 10 percent and what how much the max torque value goes up. Yes I know it doesnt make much sense but I have found on these 2.0t cars I tune that with out tcm support on some you fight this and keeping boost up and throttle open all the way. I went round and round on some cars and then applied a later model vve to the early car. It lowered the vve around 15 percent at wot range. Low and behold the max torque went from below the reported to above it and the throttle opened all the way and made the boost I commanded. It is not always about it being correct sometimes you have to do what works and im telling you lowering it will work as now do it on a lot of vehicles where max torque is too low. To date this is the one and only thing i have found that no matter the tune it will go up as I go down on the table.
Playing with virtual torque didnt always work and was hit or miss but give that a try and keep going until you see the throttle all the way open.

[sevinn]

The VVe is a major player when comes to max torque calculation. Go into the vve editor go to the area that the throttle is not opening and reduce the table 10 percent and what how much the max torque value goes up. Yes I know it doesnt make much sense but I have found on these 2.0t cars I tune that with out tcm support on some you fight this and keeping boost up and throttle open all the way. I went round and round on some cars and then applied a later model vve to the early car. It lowered the vve around 15 percent at wot range. Low and behold the max torque went from below the reported to above it and the throttle opened all the way and made the boost I commanded. It is not always about it being correct sometimes you have to do what works and im telling you lowering it will work as now do it on a lot of vehicles where max torque is too low. To date this is the one and only thing i have found that no matter the tune it will go up as I go down on the table.
Playing with virtual torque didnt always work and was hit or miss but give that a try and keep going until you see the throttle all the way open.

I've always found that increasing vve brought max torque up

[ParmRisotto87]

I?ve experienced this issue on a cammed, e85 lt1 and it was resolved with adjustments to the driver demand and virtual torque tables.

[ZincGT]

driver demand

[J_schwaa]

Hello,
been chasing my tale here for the last couple weeks, i have an lt1 gen5 with a cam swap dod and vvt delete , after swap i was having issues with torque management retarding timing and shutting the throttle. after a couple adjustments i was able to figure out the timing issue and the engine runs decent, after logging a couple times we noticed that throttle is only opening 60%, no matter what i change in the virtual toq tables it still opens only 60%, i think the problem is form the max engine torque values. it looks like every time my cmd and actual torque goes over the max, which might be causing this issue , what table is the one that controls max eng trq? i already have the peak tq figured out. thank you in advance.
farouk map 1.2 virtual torque adjsuted (1).hpt21-11-25 16-56-29.hpl

Any resolution to this problem? I'm having the same issue with my 15 Silverado L86 twin turbo setup.

[Clutch]

I got one. OP's "Driver Demand" tables are requesting "LESS TORQUE" as "VSS" increases.

When "Predicted Axle Torque" is less than "Actual Axle Torque" and "Immediate Axle Torque" the throttle blade won't continue to open.

[DannyC]

I'm slow I guess but I've been chasing this for a year. I thought I had it fixed then the TB went bad, sent it back to Soler and they replaced it and said the bearings were locked up. Since replacing the TB I always have the throttle open then close to 50% at 2700 rpm then open at 3100 rpm.

Can someone explain the fix in simple instructions?

[ochoa121805]

...

[DannyC]

Ok I was wondering if that was the problem cus I get random Throttle Position Sensor errors too.

[Clutch]

Post #9

[TriPinTaZ]

I got one. OP's "Driver Demand" tables are requesting "LESS TORQUE" as "VSS" increases.

When "Predicted Axle Torque" is less than "Actual Axle Torque" and "Immediate Axle Torque" the throttle blade won't continue to open.

This is normal on Gen V stuff. The only way to tell if it is a torque issue, is to monitor the torque PID's that deal with requested, commanded, immediate and predicted torque and make sure you're not hitting a limiter or actually commanding too little torque.

[Clutch]

Xacly..., and the fix is to raise the torque request in the "Driver Demand" tables until "Predicted Torque" is more than the "Immediate Torque" and/or "Actual Torque".

[TriPinTaZ]

Or it points to a larger issue. And increasing Driver Demand is not necessarily always the fix. My only point was the Driver Demand values always decrease as speed or RPM increase. You certainly don't want the opposite. I've been around the block a few times and a closing throttle body isn't always as cut and dry as you imply.

[Clutch]

Or it points to a larger issue. And increasing Driver Demand is not necessarily always the fix. My only point was the Driver Demand values always decrease as speed or RPM increase. You certainly don't want the opposite. I've been around the block a few times and a closing throttle body isn't always as cut and dry as you imply.

Did you even look at his Driver Demand tables? So, at 10 MPH it makes sense to request 12,298 Ft Lbs of torque when you go WOT and just blow the tires off the car? and when you're doing 60 MPH and you go WOT you only request 5768 (less than half)? This makes no sense...

@Tripin - You said "My only point was the Driver Demand values always decrease as speed or RPM increase"

My 2015 Z06/Z07/3LZ/7spd begs to differ. Perhaps it's only for fast cars.

[Clutch]

OP - Your Accelerator pedal position is maxing at only 93% and your throttle is maxing under 60%.

Under - Trans>Torque Management>General>Limit TqMgt

Set "Enable Temp" high to disable. (Not 0 degrees)

Set "Min Torque Upshift" table high to disable. (Not 0 Ft. Lbs)

Set "Min TPS" high to disable. (Not 2%)

Also, if you don't want it pulling fuel or timing during the upshift change "Upshift" from No throttle to None.

[TriPinTaZ]

Did you even look at his Driver Demand tables? So, at 10 MPH it makes sense to request 12,298 Ft Lbs of torque when you go WOT and just blow the tires off the car? and when you're doing 60 MPH and you go WOT you only request 5768 (less than half)? This makes no sense...

@Tripin - You said "My only point was the Driver Demand values always decrease as speed or RPM increase"

My 2015 Z06/Z07/3LZ/7spd begs to differ. Perhaps it's only for fast cars.

Depending on if you car is a manual vs an auto, the requested values will be referenced by axle torque which is multiplied due to gear ratio.

Depending on the Driver Demand Table which could reference RPM and Engine torque or Vehicle Speed and Rear Axle Torque, the values in the table for the same Drivers Pedal % are decreasing as speed/rpm column increases. You dont need as much torque to move an already moving object. The values in the tune at say 50% throttle at 50mph are lower than the values at 50% throttle and 10 mph. There are some slight variances and exceptions for drive modes so that the car isn't too jumpy for conditions. Manual cars pretty much have the same engine torque requested values for all speeds/rpms in WOT areas and increasing engine torque as as speed increases, but were talking about automatic DD's here as the OP is an auto.


Happen to have any Draggy screenshots of that mighty Z06? I'd like to compare it to my Z06 or maybe even a few of my client cars since you think I'm slow

[TriPinTaZ]

Where in this Gen V DD Table do you see torque REQUEST increasing at the same pedal position as vehicle speed increases(and wind resistance increases)? I tried to give you the benefit of the doubt but you started talking about wind resistance which has nothing to do with the ECU's Driver Demand logic in this topic. It's clear to me that I'm having a discussion with someone that doesn't actually know what he pretends to know and wanted to talk shit about having a fast car, but can't show proof his Z06 has more than bolt-ons at best. It's a shame because I've been nothing but professional towards you but you want to take things I say and argue them when you clearly don't understand what you think you do. Anyway, doesn't matter. I can see you haven't contributed anything to this forum and I never have to respond to you again.


Screenshot 2023-05-26 083447.png



To the OP, sorry your thread got hijacked with this asshattery. Anyhow, a datalog with the proper torque PID's could shed some light on what your throttle is doing.