C6 Corvette LS3/6l80e Tuning issues maybe?

[chaseb9]

2009 C6 Corvette LS3 - 6l80

Mods:
CAI
Headers
Stage 2 BTR V1 Cam

No torque converter - Transmission Fluid level is correct.


I need some like serious help since my tuner (mailordertuner.com) has said nothing is wrong and I can't figure out this myself. I don't want to spend money on a new tune and for it to be just like a engine or transmission issue.

So the problems I have with the engine is the car will start completely fine cold, now when its hot or I start the car a little after I turn the car off it sometimes just does not start at all or stumbles then roars away. I have to usually give it some gas when it doesn't start and hold it steady for a while to get it to idle. The car also stumbles when letting off the gas and giving it light throttle to accelerate, it sometimes pops then goes. This also happens sometimes on downshifts usually 3rd-2nd and 2nd-1st.

Now here are the transmission issues which I am not sure if some of them is the engine issue causing it or transmission. Before I cammed the car the old trans and ecu tune was perfect on the car (same tuner), I had no issues at all. Firstly the transmission shifts INSANELY hard into first, its like someone kicked you in the back. It also takes about 4-5 seconds for it to shift into drive, doesn't do it in reverse. Now the weird thing is that once you reset the adaptations in the transmission it acts completely normal, shifts fast into drive and doesn't slam into gear. When Stalling up the converter and letting off the gas like you don't want to launch the car just stalls, almost every time it stalls. It will also not do a burnout when its messing up. It did not do this after resetting adaptations but will go back to it eventually. Now here is the issues that don't change with anything I have tried. When driving and coming to a stop quickly the car will sometimes just stall and most times will just drop rpm to below 500 even to 0 then roar back to life and sit at idle.

I have no clue what to do, I have had no engine codes and the only transmission code I have only gotten was P0877 (Transmission Fluid Pressure (TFP) Switch 4 Circuit Low Voltage. I have cleared it a week ago when I reset my adaptations again and need to go check if it ever came back.

Any ideas or help will be great, I have attached one log I sent off to the tuner showing these issues and the tune.

[hjtrbo]

2009 C6 Corvette LS3 - 6l80
No torque converter

Does the problem go away if you put it back in?

[blindsquirrel]

I have had no engine codes

Trouble Codes:
P0449 - Evaporative Emission System Vent Control Circuit Intermittent (Pending, Current)

[hjtrbo]

Do another log with the combined channels in my sig. There's a few channels missing that would help.

[chaseb9]

Was fuse, gone now, log was from a bit ago.

[chaseb9]

Will do, I'll get that done tmwr.

[chaseb9]

Do another log with the combined channels in my sig. There's a few channels missing that would help.

Here is that log, first part is free revving and it tries to die and some stalling up converter and car dies when letting off gas. Lots of break up on part throttle stuff and when coming to a stop stalling down.

[Alvin]

It appears there has been zero VVE tuning on this. This is critical and will solve a lot of little issues. It is the foundation of a good tune.

To help your starting issue try adding 10-30% to the startup airflow table.

I would take time to diag that trans code. But the does good for a while then have to do the reset thing leads me to believe he jacked the pressure high and did not mess with shift timing.

[chaseb9]

It appears there has been zero VVE tuning on this. This is critical and will solve a lot of little issues. It is the foundation of a good tune.

To help your starting issue try adding 10-30% to the startup airflow table.

I would take time to diag that trans code. But the does good for a while then have to do the reset thing leads me to believe he jacked the pressure high and did not mess with shift timing.

Funny thing is I looked at the trans tune last night cause I wanna try the bluecat software transmission tables and the line pressure has not been changed one bit from stock. I plan to add 5%. I?ll go in myself and start with 10% startup airflow and move my way up to see if it gets any better. Im so tired of this stuff and spending money I?m gonna just start teaching myself..

[Cringer]

Does the problem go away if you put it back in?

Savage

[chaseb9]

Anyone see anything from the new log I posted? VVE tuning was never touched so that's fun and messing with the trans tune myself make me a little scared since it basically looks good in my eyes with Virtual torque being done but no other tables like shift scheduling or shift pressures so then putting the bluecat software tune on it just does not like that and will shift into gear at first and bang but once you reset adaptations it doesn't want to anymore.

My rev limit is 6800rpm and in my original trans tune it was set at 6400 rpm shift points, I did raise it to 6600 since that's what I kinda read to be about 200 rpm difference from redline, maybe thats the reason it does not want to shift or that I raised max line pressures by 5%

[Alvin]

Don't bother with Virtual torque right now.

VVE is critical. Don't know how else to say it. It is the foundation of a good tune.

[chaseb9]

Yeah figured, virtual torque is already messed with and doesn?t look bad to what the car is making flywheel torque, I?m gonna mess with this trans tune more and go get data logs for VVE tuning. I?ll do my best to figure it out and play it safe. Hopefully..

[chaseb9]

lol, this is a god awful 60-130 for what I've seen similar Headers/stage 2cam /Intake ls3 c6 run. Just adjusting the trans tune myself it dropped my 60-130 by 0.4 seconds. My tuner is absolute trash and it's not even "perfect" yet. What I waste of $800 from mailordertuner.com...


IMG_2251 (1).jpg IMG_2249 (1).jpg

[chaseb9]

Don't bother with Virtual torque right now.

VVE is critical. Don't know how else to say it. It is the foundation of a good tune.

Gonna buy your remote tuning when I get vbands welded in to get rid of my exhaust leaks so my wideband reads perfect.

[edcmat-l1]

lol, this is a god awful 60-130 for what I've seen similar Headers/stage 2cam /Intake ls3 c6 run. Just adjusting the trans tune myself it dropped my 60-130 by 0.4 seconds. My tuner is absolute trash and it's not even "perfect" yet. What I waste of $800 from mailordertuner.com...


IMG_2251 (1).jpg IMG_2249 (1).jpg

Holy crap I need to raise my rates.

Yeah looking through it, it is not impressive at all. I'd say not even mediocre for someone doing it professionally. The main spark tables are completely untouched. And on top of that the "gas" table is zeroed which lowers your total spark at WOT. So he basically detooned it.

[chaseb9]

Holy crap I need to raise my rates.

Yeah looking through it, it is not impressive at all. I'd say not even mediocre for someone doing it professionally. The main spark tables are completely untouched. And on top of that the "gas" table is zeroed which lowers your total spark at WOT. So he basically detooned it.

Wow... yeah see I started with transmission stuff since I really thought engine was fine, clearly both are screwed. I'm just gonna give up on all this crap since I don't know anything and I am trying to learn and wait till I can get proper tune done without risking anything.

This is some actual BS for being the Texas Speed recommended tuner...

[Alvin]

Yeah damn. I need to keep up with the times.. I'm not entirely sure we'd charge $800 to do it in person on the dyno.. I don't handle money around here though.

[chaseb9]

Yeah damn. I need to keep up with the times.. I'm not entirely sure we'd charge $800 to do it in person on the dyno.. I don't handle money around here though.

Yeahhhh, two tunes from them for bolts on then when I went cammed.. $800 down the drain for nothing. Man that could've gone to a converter. May my college student paychecks rest in piece ;(