what kinds power do u guys estimate???
02-25-2008, 05:12 AM
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what kinds power do u guys estimate???
I have a jdm b20 BONE STOCK with a sc34 log mani, 580 cc, 255 walbro...if I have a real good tune how much power do u think I COULD see??
02-25-2008, 07:22 AM
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Re: (Schister66)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by miller »</TD></TR><TR><TD CLASS="quote">325</TD></TR></TABLE>
This. I can see your 580s being pretty much used up by then.
This. I can see your 580s being pretty much used up by then.
02-25-2008, 08:43 AM
#6
Man U FTW
The rule for injectors is 6cc per whp. If you use that method, the 580s are as follows:
580cc x 4inj = 2320cc (total)
2320 / 6cc per whp = 386.667whp at a 75-85% duty cycle
You can safely make up to 387whp on those injectors at stock fuel pressure. They technically CAN make more, but i wouldn't expect a lot more out of them.
580cc x 4inj = 2320cc (total)
2320 / 6cc per whp = 386.667whp at a 75-85% duty cycle
You can safely make up to 387whp on those injectors at stock fuel pressure. They technically CAN make more, but i wouldn't expect a lot more out of them.
02-25-2008, 09:04 AM
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Re: (Schister66)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Schister66 »</TD></TR><TR><TD CLASS="quote">The rule for injectors is 6cc per whp. If you use that method, the 580s are as follows:
580cc x 4inj = 2320cc (total)
2320 / 6cc per whp = 386.667whp at a 75-85% duty cycle
You can safely make up to 387whp on those injectors at stock fuel pressure. They technically CAN make more, but i wouldn't expect a lot more out of them. </TD></TR></TABLE>
Yeah, I figured I undershot it a little bit but it's better to do that with an injector than overshoot.
Curious though, how are you getting 75-85% duty cycle out of that? Is the 6cc/whp coming to that conclusion?
580cc x 4inj = 2320cc (total)
2320 / 6cc per whp = 386.667whp at a 75-85% duty cycle
You can safely make up to 387whp on those injectors at stock fuel pressure. They technically CAN make more, but i wouldn't expect a lot more out of them. </TD></TR></TABLE>
Yeah, I figured I undershot it a little bit but it's better to do that with an injector than overshoot.
Curious though, how are you getting 75-85% duty cycle out of that? Is the 6cc/whp coming to that conclusion?
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02-25-2008, 09:09 AM
#8
Man U FTW
Its just a general rule based on what i've seen around. People used to base injector sizing on 5cc per bhp, but that's not a great measurement since you have to then guess at what whp you'll make. The 6cc per whp is not meant to be deadly accurate, but rather, give you a good idea where you should be about. If you're looking to size injectors and you hit your power goals within a little bit of the 6cc per whp range, its fine.
Basically its just an easy way to get in the ballpark..
Basically its just an easy way to get in the ballpark..
02-25-2008, 10:37 AM
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Re: (Schister66)
Gotcha. Yeah, I've got my Maximum Boost book sitting here in my schoolbag with all of the calculations highlighted and tabbed. 
Wasn't about to break it out just for this though. 6cc/whp is the first I've heard of it, good ****.
Wasn't about to break it out just for this though. 6cc/whp is the first I've heard of it, good ****.
02-25-2008, 12:16 PM
#10
Man U FTW
Re: (SovXietday)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SovXietday »</TD></TR><TR><TD CLASS="quote">Gotcha. Yeah, I've got my Maximum Boost book sitting here in my schoolbag with all of the calculations highlighted and tabbed. </TD></TR></TABLE>
That's a good read...i still have yet to go through most of it, but i have a .pdf copy on my laptop. If i find some time, i'm going to incorporate it into a nice little write-up for the FI Forum (it'll be better than the G2IC Boost FAQ)
</TD></TR></TABLE>That's a good read...i still have yet to go through most of it, but i have a .pdf copy on my laptop. If i find some time, i'm going to incorporate it into a nice little write-up for the FI Forum (it'll be better than the G2IC Boost FAQ)
02-25-2008, 12:31 PM
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Re: (Schister66)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Schister66 »</TD></TR><TR><TD CLASS="quote">
That's a good read...i still have yet to go through most of it, but i have a .pdf copy on my laptop. If i find some time, i'm going to incorporate it into a nice little write-up for the FI Forum (it'll be better than the G2IC Boost FAQ) </TD></TR></TABLE>
If you want help let me know. I read the book between classes in school a lot. The only problem I have is that the author focuses too much on psi being the hindering aspect of turbocharging an engine and not torque made or better yet a combination of both with turbo/intercooler efficiencies and all that stuff.
Otherwise, great book indeed.
That's a good read...i still have yet to go through most of it, but i have a .pdf copy on my laptop. If i find some time, i'm going to incorporate it into a nice little write-up for the FI Forum (it'll be better than the G2IC Boost FAQ) </TD></TR></TABLE>
If you want help let me know. I read the book between classes in school a lot. The only problem I have is that the author focuses too much on psi being the hindering aspect of turbocharging an engine and not torque made or better yet a combination of both with turbo/intercooler efficiencies and all that stuff.
Otherwise, great book indeed.
02-26-2008, 05:25 AM
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Re: (Schister66)
well I have a 2.5 inch dp into 2.5 inch piping to a virbrant muffler...dont think I could make 300 (which is what I am shooting for) with that or should u run open dp??
02-26-2008, 08:05 AM
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Re: (T9U4ReBgO)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by T9U4ReBgO »</TD></TR><TR><TD CLASS="quote">well I have a 2.5 inch dp into 2.5 inch piping to a virbrant muffler...dont think I could make 300 (which is what I am shooting for) with that or should u run open dp??</TD></TR></TABLE>
Full 2.5" is fine. Seriously, a simple clean setup with what you have will do 300 no problem and be perfectly safe with a good tune.
Full 2.5" is fine. Seriously, a simple clean setup with what you have will do 300 no problem and be perfectly safe with a good tune.
02-26-2008, 09:47 AM
#18
Man U FTW
Re: (SovXietday)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SovXietday »</TD></TR><TR><TD CLASS="quote">
Full 2.5" is fine. Seriously, a simple clean setup with what you have will do 300 no problem and be perfectly safe with a good tune.</TD></TR></TABLE>
x2...you'll be fine with a 2.5". You'd be better with a 3", but that's "ideal"
Full 2.5" is fine. Seriously, a simple clean setup with what you have will do 300 no problem and be perfectly safe with a good tune.</TD></TR></TABLE>
x2...you'll be fine with a 2.5". You'd be better with a 3", but that's "ideal"
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