CR vs head flow with D1sc & 91
11-26-2015, 10:21 AM
#1
CR vs head flow with D1sc & 91 I currently have a stock 5.3 Longblock with a tick stage 1 v2 blower cam 223/235 .610/.610 116+5 and installing a D1sc and will be maxing it out 60k+ rpm 16+psi. It currently has 706 heads and I'm wondering if it'd be worth throwing 799's on it for flow even though I'd be dropping compression from 9.4 to 9.1 however I'll be running pump 91 with no meth. I thought I'd get 2 benefits with flow and compression but it seems lowering compression for boost is not the the thing to do anymore. Also don't want to mill 799's and loose deck thickness. Which heads 706 or 799?
11-30-2015, 01:37 PM
#8
That's a good question. I see in your other thread you're thinking about running a dry shot of nitrous, or possibly a wet shot, so I think that will play into a safe compression for 91 octane. You could probably get away with 10:1 with a good tune.
11-30-2015, 01:49 PM
#9
Originally doing research and reading other builds for boost and going off factory cr for boosted engines ex: ls9 9.1cr and people throwing 317's on their 5.3 and since 93 or e85 isn't readily available I thought dropping cr would be a benefit however I started noticing procharger builds running 10.1 to 11.5 on pump gas but want to push as most boost as I can with most compression as possible. Flow + compression = more power!
11-30-2015, 01:54 PM
#10
Same with the nitrous. I already have it and people using it to either spool a turbo or flash a converter to get into the rpms for supercharger applications for boost quicker so if I can keep it and utilize it the right way would be awesome but if setup can't handle it I'll just have to wait
11-30-2015, 03:59 PM
#13
799s, especially if you are really planning on trying to run that much boost on 91 octane. Here in AZ with our crappy 91 octane and hot air you wouldn't get much above 12-14 psi at 9.1 compression and even then it would be in the single digits for timing to not detonate. Of course this depends on the whole combo but it's what I normally see.
12-02-2015, 02:23 PM
#16
Yeah in Nebraska. Closest to me and who I've gone to everytime is DK Performance in Humphrey, NE. They've treated me pretty good but the last couple tunes I wasn't to sure of. I lost power drivability and gas mileage. Stock 5.3 with 01 ls6 cam 320whp 150 shot 470whp 22mpg before and 295whp 430whp 16mpg after his tune. Then put the tick boost cam in and made 333whp & 150 shot 480whp. I'll probably go back but I went there to jet up from my 150 shot that I ran 3 years with no issues to a 175 or 200 but ended up losing in all three categories to be "safe"
12-02-2015, 08:45 PM
#18
You'd think so right? It's not as accessible as you'd think. I actually work at an ethonol plant that produces 3 million gallons of ethanol per day but all of it goes to California and not one gas station in that town has e85. 91 is much easier to find and with e85 even if I got a barrel at home idk if a tank would get me to the next station that has it. I'd love to have it but accessibility isn't there