c6 corvette Speed density tuning help

[Wakethis2006]

so I have a 2005 C6 corvette that is procharged, heads and cam and long tubes and dual nozzle meth kit and LS3 intake. I started with a regular LS2 MAf and blew 1 apart on the dyno and was maxxing them out. so I swamped out to the LS3 MAF and did a ZL1 MAP sensor. I know its a 3 bar. so I was going to switch to SD tuning but had a few questions. On the 3.0 VCM editor under the OS it doesn't have 2 bar or 3 bar anymore? so is it already built in and you don't have to switch anymore? do I need to change any settings for the 3 bar map sensor?
next ? is I turned off the MAF, pulled off the pink wire off the MAF so it wasn't getting power anymore and when I went to start the tuning process I kept getting reduced engine power and couldn't go over 2k on rpms at idle or anything.

also on the SD tune do I go through and get the idle down like I normall would with the start up air flow and the everything and spark advance or do I go a different route. any help would be great I know there was a write up on the stickies but I didn't know if it was for 3.0 yet.

[schpenxel]

Can't run a 3 bar MAP on a 2005 C6 (E40 ECM).

I assume it has heads also? Because an LS3 intake won't fit on LS2 heads that came on a 2005.

Post the tune for starters

[Wakethis2006]

Yes it has ls3 cncd heads and intake. So what map should I run to work with the corvette computer?

[schpenxel]

https://www.dedicatedmotorsports.com...ct-p/25bms.htm

[Wakethis2006]

Why can't I just run my 3 bar I already have. The computer just won't register anymore past the 2 bar but the sensor should still work

[schpenxel]

Because an e40 won't accept the settings for a 3 bar sensor. It's limited to 255 linear and only can use positive offsets. 3 bar needs over 300 linear and has a negative offset if memory serves.

[Wakethis2006]

jasons convette tuned.hpt

here is the tune that was done on the dyno buy a tuner that is local. wanted to get dyno numbers so had to let him tune it but the car honestly runs like crap. it surges bad when cruising and just doesnt run that great. i tuned it with a MAF off the ls2 before i took it to him. here is everything


stock 6.0 bottom end
LS3 CNCd heads
LS3 intake
LS3 Map sensor(stock non ZL1)
OBDX Long tube headers no cats
magna flow axle back
custom cut comp cam 223/239 115
dual nozzle meth kit
LS7 lifters
BTR springs and push rods
LS9 head gaskets/arp head studs
D1sc Procharger at 10 lbs
Mccloud RXT
kennebell BAP

[Wakethis2006]

oh ya also running 65lb fass injectors

[schpenxel]

What MAF is being used? LS2 or card style?

Also we need a log of you driving it around with it surging

[Wakethis2006]

I will get it a log later this afternoon. I am using the card style LS3 maf

[schpenxel]

And you're saying it drove a lot smoother originally with the ls2 maf? If so I'm not surprised at all. Get a log and include maf airflow and freq

[GHuggins]

Your on primarily MAF and it needs lots of work - very rough and your low curve doesn't even line up with your high curve...

[mowton]

I will get it a log later this afternoon. I am using the card style LS3 maf

Not sure if this is late to the party but using the LS3 MAF on an E40 will need to be re-scaled to the LS3 values, Its easy to change the axis values and data in the 2005 to the LS3 values.

Ed M

[schpenxel]

Your on primarily MAF and it needs lots of work - very rough and your low curve doesn't even line up with your high curve...

There's that little detail too. Dropping 15 g/sec airflow while increasing MAF freq probably isn't going to end in a smooth running vehicle...

I also wouldn't put 30* of idle spark in it either

VE table wise he just took the original table and smoothed it slightly

OP--where are you located??