440 CI LS7 - quick question
hi guys,
I’d like to receive one good advice from you.
I ordered to Golen enigne one 440ci LS7 short block.
The OEM one was seriously damaged.
It will be fitted with Kooks long tube headers, CAI, Katech torquer camshaft, fast 102 manifold, stock LS7 throttle.
The question is:
Per your experience, stock LS7 Bosch injectors are enough or they should be updated?
(they should be rated at 39 lb/hr according to Bosch:
http://www.boschdealer.com/index.php...products_id=35 )
or it's better to change over with some bigger ones? in that case, any p/n reccomended?
thank you
bye!
WOT log file and comments, please!
Hi guys,
today I spent some time driving this car:
Golen engine Service 440ci LS7 short block.
Kooks long tube headers (no cat converter at all)
CAI by Air Aid, 160° thermostat
Katech torquer camshaft,
Fast 102 manifold,
Stock LS7 throttle and injectors,
brand new oxygen sensors, MAF, ECT sensors.
I run out a nice tune, using WB and Bluecat SW to to the VE, no bucking no surging at all. You can use the cruise control il 6 gear at 1200 RPM with no issue!
That being said, I have to correct a little more the tune file (MAF airflow at low RPM and at WOT)…
However, I think the injectors are not enough.
Take a look at minute 5.29 & 8.37. 96% duty cycle. Wow… I will swap LS9 injectors early next week.
Also take a look at minute 7.48. why the ECM have 6 degrees of retard? Maybe because I suddenly accelerate? Should be addressed in the tune file or is kind of normal?
There are some lean spikes on the log file, like minute 6.44 & 6.48. Are these kind of normal too or should be addressed?
Last but not least. Between minutes 6.54 & 7.20 I’m running with 6 gear and cruise control. There are several negative spikes on the timing (mostly not felt during test drive) and the car is running lean. Is normal GM strategy to save fuel or there is something wrong?
thanks for sharing your opinion on my tune!
bye