Looking for opinions....
Looking for opinions.... OK guys here is the deal... First of all I live in Texas... which right now we are close to 100 deg days... secondly I want to know what you all think about running a Whipple @ 9psi on pump gas WITHOUT water injection.... Just a stock internal engine with a 9psi whipple.... I have gotten a couple of opinions but I thought I would throw it out here cause I am very stubborn as these people will tell you... Also keep in mind I have 30Lb 8.1L injectors which I am trying to tune myself per Ls1 Edit..... I am thinking if I can get my Ltrims in line and then retard the timing just a SLIGHT bit I might be able to pull it off.... END Opinions welcome now.....
Moderator
Joined: Nov 2001
Posts: 3,048
Likes: 12
From: Raleigh, NC
Re: Looking for opinions.... I don't know about the Whipple, but I think 9 PSI is a high goal without SIGNIFICANTLY lowering timing and finding ways to limit detonation in 100+ degree weather (unless you lowered the static compression).
7 PSI would be more manageable.
7 PSI would be more manageable.
Re: Looking for opinions.... 9 psig won't be too bad
gotta remember, the truck motor has a lower CR to start.
advance curves are lower on the truck to start, not a premium fuel vehicle.
What base motor are you installing it on??
gotta remember, the truck motor has a lower CR to start.
advance curves are lower on the truck to start, not a premium fuel vehicle.
What base motor are you installing it on??
Re: Looking for opinions.... don't laugh but the 4.8L <img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" /> and if i get it tuned right for the 9psi then i will prolly go with a 50 shot of nitrous!! hopefully! <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
Re: Looking for opinions.... hi will, you know my oponion on this subject but i think i can answer another one of your questions. are 30lb/hr injectors large enuff.
strait form the whipple web site http://www.whipplesuperchargers.com/powercht_c.html the 4.8 with a whipple at 6psi is rated at 384fwhp. now add hp for the extra 3psi, about 20hp/lb. so now you are trying for 444hp.
now to calculate injector size you can goto rcengenering http://www.rceng.com/technical.htm and use one of their tables to see what size injector you need.
at 444hp, .55bsfc and 80% duty cycle you need 38lb/hr injectors.
even at 100% duty cycle you will need 30.5lb/hr
from what i understand .55bsfc may be too low, .60 might be closer. i don't think those injectors have a chance, at 6psi they should work fine, somewhere short of 9psi they will run out.
the best thing about these websites is you can copy what others have made work. is anyone runing 9psi, if so what did they have to do to make it work?
strait form the whipple web site http://www.whipplesuperchargers.com/powercht_c.html the 4.8 with a whipple at 6psi is rated at 384fwhp. now add hp for the extra 3psi, about 20hp/lb. so now you are trying for 444hp.
now to calculate injector size you can goto rcengenering http://www.rceng.com/technical.htm and use one of their tables to see what size injector you need.
at 444hp, .55bsfc and 80% duty cycle you need 38lb/hr injectors.
even at 100% duty cycle you will need 30.5lb/hr
from what i understand .55bsfc may be too low, .60 might be closer. i don't think those injectors have a chance, at 6psi they should work fine, somewhere short of 9psi they will run out.
the best thing about these websites is you can copy what others have made work. is anyone runing 9psi, if so what did they have to do to make it work?
