Re: Dyno tuning the new 3.9 lz9 setup.
Posted: Thu Jun 30, 2022 4:52 pm
Reminder this is a bone stock lz9 with just a 75mm truck tb. Stock peanut lnj cam from 09 equinox fro vvt delete
might start a new thread but the first pull did 492 hp with maybe 1 lb more boost over the 93 tune and zero timing changes.
I added 2 more degrees after 5500 rpm and it went to to 497.
I added 2 more degrees from 4600 to 5500 and peak power went to 505.
I pulled out those 2 degrees from 4600 to 5500 because it didn't add much power so I felt it better to stay safer.
Final pull I put 24% on the boost controller duty cycle at 5400 rpm and it added between .5 and 1lb additional lb of boost going to 15.2 lbs. Peak HP at 5600 rpm was 521whp.
At this boost level from 14 to 15 I am picking up about 15 hp per lb of boost. If that holds, than 19 lbs would be an additional 60 HP.
I am out of injector with e85 testing right near 85%. Since I was out of injector i didn't feel safe adding more boost. On the last run I hit 96% injector duty cycle. The shop owner talked me out of more runs as he says with ls engines and e85 he likes seeing injector DC under 80%. So I listened. I only did 5 pulls.
My butt Dyno was was close. Here was the D.A. Dyno room showed 88 degrees F.
might start a new thread but the first pull did 492 hp with maybe 1 lb more boost over the 93 tune and zero timing changes.
I added 2 more degrees after 5500 rpm and it went to to 497.
I added 2 more degrees from 4600 to 5500 and peak power went to 505.
I pulled out those 2 degrees from 4600 to 5500 because it didn't add much power so I felt it better to stay safer.
Final pull I put 24% on the boost controller duty cycle at 5400 rpm and it added between .5 and 1lb additional lb of boost going to 15.2 lbs. Peak HP at 5600 rpm was 521whp.
At this boost level from 14 to 15 I am picking up about 15 hp per lb of boost. If that holds, than 19 lbs would be an additional 60 HP.
I am out of injector with e85 testing right near 85%. Since I was out of injector i didn't feel safe adding more boost. On the last run I hit 96% injector duty cycle. The shop owner talked me out of more runs as he says with ls engines and e85 he likes seeing injector DC under 80%. So I listened. I only did 5 pulls.
My butt Dyno was was close. Here was the D.A. Dyno room showed 88 degrees F.
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