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Author Topic: Max boost on 440cc  (Read 2600 times)

Towdogg

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Max boost on 440cc
« on: April 08, 2009, 12:37:37 AM »
I have a 75mm Vitara D16Z6 with .57 trim and 440cc injectors...

What is the max amount of boost I can run on the injectors before they dry up...   :evil:

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88dx

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Re: Max boost on 440cc
« Reply #1 on: April 08, 2009, 12:39:21 AM »
29.1189
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patsmx5

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Re: Max boost on 440cc
« Reply #2 on: April 08, 2009, 12:39:57 AM »
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Quote: Originally Posted by Adam Hopkins
There is no such thing as too much boost. You could have too little rod, piston, or sleeve. But never too much boost.

88dx

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Re: Max boost on 440cc
« Reply #3 on: April 08, 2009, 12:40:45 AM »
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marcj

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Re: Max boost on 440cc
« Reply #4 on: April 08, 2009, 12:42:49 AM »
haha, 450cc injectors should max out around 300 hp at stock fuel pressure.

I'm thinking they might support more with a decent FPR, but I'd recommend upgrading the injectors instead. Delphis are cheap
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Towdogg

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Re: Max boost on 440cc
« Reply #5 on: April 08, 2009, 12:55:21 AM »
Quote from: 88dx on April 08, 2009, 12:39:21 AM
29.1189

So the post whoring begins!   Get a job!  :somb:
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sewell94

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Re: Max boost on 440cc
« Reply #6 on: April 08, 2009, 01:14:39 AM »
boost is irrevelant.  it is all about the power.  What fuel pump?? What base fuel pressure??  what cams?? any port work?? Theres alot of variables involved,

taking a random guess(assuming you have a stock head/cams and a 255) you should be able to get at least 17-18lbs out of them.
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chris

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Re: Max boost on 440cc
« Reply #7 on: April 08, 2009, 01:41:03 AM »
Fuel pressure makes a huge difference. I have made 190 whp on b16a's all motor with stock injectors. Fpr was cranked up as high as it would go classic b&m fpr.
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Towdogg

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Re: Max boost on 440cc
« Reply #8 on: April 08, 2009, 01:46:30 AM »
I do have the Classic B+M FPR but switched it out for the bigger outlet B-series FPR.

Stock fuel pump...

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lilpooh21186

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Re: Max boost on 440cc
« Reply #9 on: April 08, 2009, 02:01:08 AM »
chuck i may have a 255 for you i have to raid the shed to find it though
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rsmith2786

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Re: Max boost on 440cc
« Reply #10 on: April 08, 2009, 02:05:05 AM »
(34.8MJ/L)*(1L/1000cc)*(440cc/min)*(min/60s)=.2552MW=340HP

Assume approx thermal efficiency of 40% and you get 136HP.

Clearly too low.  Where is my error?  440cc/min at base fuel pressure?  Some of my conversions could be wrong too.  It's late.
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jhonda

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Re: Max boost on 440cc
« Reply #11 on: April 08, 2009, 05:10:35 PM »
im running 440cc on my b20 vtec turbo and putting down 342hp with them and a walbro 255 fuel pump tuned on crome (but yea their probably about maxed out) :yes: :o
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patsmx5

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Re: Max boost on 440cc
« Reply #12 on: April 08, 2009, 05:18:05 PM »
'bout yay much.

<------------------------------>
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Quote: Originally Posted by Adam Hopkins
There is no such thing as too much boost. You could have too little rod, piston, or sleeve. But never too much boost.

MantisX

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Re: Max boost on 440cc
« Reply #13 on: April 08, 2009, 05:18:53 PM »
Quote from: jhonda on April 08, 2009, 05:10:35 PM
im running 440cc on my b20 vtec turbo and putting down 342hp with them and a walbro 255 fuel pump tuned on crome (but yea their probably about maxed out) :yes: :o

Did you increase the pressue any with a regulator or is it stock pressure?
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jhonda

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Re: Max boost on 440cc
« Reply #14 on: April 08, 2009, 05:29:25 PM »
im not sure but i think the pressure is around 60 or something (i had the car tuned by slowmotion-motorsports here in ohio) after i got it all turboed up... i was expecting somewhere around 250whp on 9psi NOT 350whp... but its still going strong no smoke and no problems. next time i pop the hood i'll look at what the pressure is at i cant remember 
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stock b20-vtec + 342hp 247wtq = NO TRACTION

Colin

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Re: Max boost on 440cc
« Reply #15 on: April 08, 2009, 05:54:41 PM »
Quote from: rsmith2786 on April 08, 2009, 02:05:05 AM
(34.8MJ/L)*(1L/1000cc)*(440cc/min)*(min/60s)=.2552MW=340HP

Assume approx thermal efficiency of 40% and you get 136HP.

Clearly too low.  Where is my error?  440cc/min at base fuel pressure?  Some of my conversions could be wrong too.  It's late.

Thermal, yes, but typical engine efficiency is about 20%. Multiply that by 4 injectors and you get about 272HP.

It's pretty typical that these things are good til about 300hp, depending on fuel pressure.
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rsmith2786

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Re: Max boost on 440cc
« Reply #16 on: April 08, 2009, 07:42:59 PM »
Damn.  4 injectors. :D
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