408 roots blower build
Sep 12, 2011 | 09:28 AM
#103
Well i have a kick *** looking engine atleast. Well the engine didn't make near as much as i thought. With the roots blower i knew it wouldn't be a power horse but i'm not impressed much. Anyways here's the results.
6 lbs boost 25* timing 9.0 A/F ratio 88degrees AIT start to finish of pull= 705.2HP@6,500rpm 664.4TQ @4,700 rpm.
9 lbs boost 23* timing 8.5 A/F ratio 126 degrees start and 162degrees AIT end of pull= 732.5HP@6,100rpm 667.5TQ @5,200 rpm.
15lbs boost 17* timing 8.0 A/F ratio 183 degrees start and 209 degrees AIT end of pull= 722.9Hp@6,300rpm 678.3TQ @ 4,600 rpm.
Any input or suggestions? I have tomorrow morning yet to dyno if needed. I'll try to post dyno sheets and videos soon.
6 lbs boost 25* timing 9.0 A/F ratio 88degrees AIT start to finish of pull= 705.2HP@6,500rpm 664.4TQ @4,700 rpm.
9 lbs boost 23* timing 8.5 A/F ratio 126 degrees start and 162degrees AIT end of pull= 732.5HP@6,100rpm 667.5TQ @5,200 rpm.
15lbs boost 17* timing 8.0 A/F ratio 183 degrees start and 209 degrees AIT end of pull= 722.9Hp@6,300rpm 678.3TQ @ 4,600 rpm.
Any input or suggestions? I have tomorrow morning yet to dyno if needed. I'll try to post dyno sheets and videos soon.
Gotta start somewhere
I'd like to see a higher boost run with lower starting IAT's. Have you thought about adding a interrcooler?http://www.theblowershop.com/product...R-71-SERIES-1/
Sep 12, 2011 | 09:30 AM
#104
Thread Starter
Launching!
Joined: Jan 2008
Posts: 248
Likes: 0
From: MN
Ok so what should i set the A/F ratio at and timing for a 15.5 psi pull?
I also have a 19psi setup i can put on. What recommendations for timing and A/F for that?
The 9lb pull produced the most hp and ait were not to bad and changes to the timing or A/F on that setup?
I also have a 19psi setup i can put on. What recommendations for timing and A/F for that?
The 9lb pull produced the most hp and ait were not to bad and changes to the timing or A/F on that setup?
Sep 12, 2011 | 09:32 AM
#105
Thread Starter
Launching!
Joined: Jan 2008
Posts: 248
Likes: 0
From: MN
I'm thinking of a 19lb run 1st pull this afternoon. That way the ait's will be down and not up there from the previous 4 pulls. Hopefully the ecu won't pull timing this way. What's your thoughts for timing and A/F for the 19 lb pull and also for the 15lb pull?
Sep 12, 2011 | 10:33 AM
#106
I would run 17 deg. And equivalent of 11.2 or so afr. Depends how the ecu alters timing with iat. IMO that should be safe. I run 21 deg. at equivalent of 11.9:1 at 14 psi with e85. Seems like you can go a touch leaner with e85 than gasoline. Don't blame me if something happens though, lol.
Last edited by joeyc125; Sep 12, 2011 at 10:39 AM.
Sep 12, 2011 | 12:09 PM
#107
Thread Starter
Launching!
Joined: Jan 2008
Posts: 248
Likes: 0
From: MN
I would run 17 deg. And equivalent of 11.2 or so afr. Depends how the ecu alters timing with iat. IMO that should be safe. I run 21 deg. at equivalent of 11.9:1 at 14 psi with e85. Seems like you can go a touch leaner with e85 than gasoline. Don't blame me if something happens though, lol.
Sep 12, 2011 | 01:02 PM
#108
Joined: Jan 2006
Posts: 16,282
Likes: 438
From: Huntsville, AL
Ethanol (and methanol) has a much higher octane rating that gas, no way should you run 21 degress on a strictly gas setup with that combo, and its going to be hot as hell at 19lbs with no intercooler, even if its your first run.
Sep 12, 2011 | 02:13 PM
#110
Also, he has injectors both pre and post blower, so meth would hardly benefit in this case, however an intercooler would do wonders. If you want to get the good number, you have to run high boost setup first run. Maybe even warm it up to get the oil temp where you want it, then let it sit for 15 minutes with some ice cold towels on the blower, you'll be amazed. Icing my blower in the pits took 1-2 tenths off my runs every time.