Lq4 turbo swap falls on face at 4800 WOT

[Ap_performance]

When I floor it rpms climb to 4800 then rpms drop while still at WOT

[Evo8john]

We are going to need a lot more information if you want any help. Please post a log and the tune file at the very least.

[Ap_performance]

this the tune
3-14 c10 better fueling with 30lbs inj.hpt

[5FDP]

Holy moly what happened to your VE table?

You have a turbo and only 30lb/hr injectors? There is no way they will supply enough fuel on a turbo 6.0.

Your PE and BE are not setup right either. The PE is set to 1.00, that is stoich, and then your BE is set up to run stoich all the way to 3-4psi of boost before it starts adding in fuel. That is just asking for a problem.

Your PE should start at 1.200 or so. Then the BE needs to start at 1.200 for 100kpa and get richer as boost rises. I'd suggest aiming for 11.0 to 11.5 AFR for starters.


Go back to a stock looking timing curve. You need to understand how the GM timing curves should be. Look at a stock timing table. Timing is higher at low load/cylinder airmass. Then the timing will slowly drop as rpm's rise and cylinder airmass climbs. Keep the stock like curve to the table and have the timing level out after .76-.80 cylinder airmass to the timing you want to run in boost. Something like 13-15 degrees is a good starting point.


A log would be helpful too but nothing is of use until you fix this tune that is a train wreck.

[Ap_performance]

thanks will do asap and the injectors are deccaped

[5FDP]

If they are de-capped put the flow rate they are at just to give you the best chance at dialing it in. No reason to have them at 30lb/hr when most flow 70-80lb/hr

The VE I'd probably start over with and see how it runs. You need to use your wideband o2 sensor to create a wideband error so that you can see exactly where you need to add or remove fuel from the VE.