lm38330

iTrader: (12)

Ive searched,no straight answer.
Ok guys,I sent my PCM for mail order tune after doing these mods
799 heads
228r cam
Ls6 intake
Ls6 injectors.
I was told that I have to be careful,and that I can't go WOT without wideband,since I can lean my engine out.I'm working on getting a wideband,but that will be sometime next week.now my question

How safe is WOT without a wideband? What are the chances of me leaning out the engine? I can cruise my car right? any other pointers?

Thanks

LSWHO

iTrader: (1)

I assume the tuner told you this?

I wouldn't even come close if so. They should know better than anybody how lean that car can run.

Go get it dyno'd. About $50 and they'll tell you how lean you are/aren't.

flame

iTrader: (13)

Your MAF could be out of calibration, fuel pump weak, injectors dirty, the tuner can't know all these things. Play it safe until you know its is good.

Sid447

It's not got much to do with whether you need a WBo2; It's about getting the right combination of parts that are proven to work.

LS6 injectors max out with a 210 cam, let alone a 228.
You need the 36lb injectors and probably a 255L/hr fuel pump.
Once you know your fuel system can deliver and the PCM tune is professionally done you then won't have any doubts.

Frost

iTrader: (45)

those injectors will support over 420rwhp.

If the fuel pressure is solid and the MAF is known to be good, you should be good if the mail order tune is, you just can't know for 100% until you see it with a wideband. See if you can borrow a friends or something. If you are peaking in at NBO2 voltage at WOT it will let you verify that you are in the ballpark.

I use the disclaimer on my own calibrations after seeing the sea of bad MAFs, intake leaks, etc that often get pointed back at the calibration after users seem to be unable to properly troubleshoot their setups when there are issues.

The cars are fine to cruise on; normal closed loop operation can mask problems such as a bad MAF through heavy fuel trimming.

Sid447

Hello Steve,

Fitting just a small 212-218 cam on an otherwise stock 5.7 shows IDC of over 80% (using EFI-L scanner) above 5,500rpm when retaining the 28.5lb LS6 injectors. A change to 36lb-ers fixed it.
These were on cars making less than 400rwhp (eddie-current dyno).

The stock 194L/hr fuel pump also failed to deliver enough fuel for a cammed LS7 (505rwhp e/c dyno) during sustained high-speed running (130mph+) the engine burnt a number of valves and damaged a few pistons too.

A short WOT pull on a dyno may not show this problem.
Only passing on actual events that were experienced.

bene

iTrader: (16)

I have 28.8lb inj w/ my stock 243 heads and EPS 222/226 cam. With 20+ dyno pulls, I was watching my IDC the whole time and at 6.2K rpm, it was at 80%.

This is w/ dyno dynamics machine.

Sid447

GM themselves,

fitted 36lb injectors in the 430ehp Corvette ASA cars....

http://www.corvettefever.com/techart...sa_engine.html


Why not go with what these people below recommend, they seem to know what they are talking about:

http://www.rceng.com/technical.aspx