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24 Lb Injectors

  • Thread starter Thread starter JD1964
  • Start date Start date Dec 22, 2013
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NIKwoaC

中國製造
15 Year Member
Oct 31, 2006
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Dec 24, 2013
#21
  • Dec 24, 2013
  • #21
mikestang63 said:
No offense, but I suggest you change professions with that kind of advice. There are hundreds if not thousands of guys running 19's and around 300 hp. 24's can easily support 325...

Jrichker posted this several times


Injector HP ratings: divide flow rating by.5 and multiply the result by the number of injectors. This uses a 100% duty cycle. These ratings are for naturally aspirated engines.

Example:
19/.5 = 38, 38 x 8 = 304 HP
24/.5 = 48, 48 x 8 = 384 HP
30/.5 = 60, 60 x 8 = 480 HP

The preferred duty cycle is about 85% maximum, so for a safety factor multiply the final figure times .85.

304 HP x .85 = 258 HP
385 HP x .85 = 326 HP
480 HP x .85 = 408 HP

Remember that the above ratings are at 39 PSI. Increasing the pressure will effectively increase the flow rating. Example: a 19 lb injector will flow 24 lbs at 63 PSI, and a 24 lb injector will flow 30 lbs at 63 PSI.

See http://users.erols.com/srweiss/ to get the calculators used in these examples.
Click to expand...

If you don't know who he is, Decipha is a damn tuning wizard. There are ways to cheat undersized injectors, and people do it every day, but there are a lot of corners that people cut with these cars across the board.

Plus I think Decipha is talking rear wheel and you're talking crank.
 
Reactions: f8tlfiveo

NIKwoaC

中國製造
15 Year Member
Oct 31, 2006
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Dec 24, 2013
#22
  • Dec 24, 2013
  • #22
Also, my $.02: anyone with non-stock heads should consider a wideband O2 sensor and gauge. They are kind of expensive, but without it, you're just guessing.
 

f8tlfiveo

My wife likes my spool and blow-off valve.
Aug 8, 2007
1,585
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64
Lancaster, PA
Dec 24, 2013
#23
  • Dec 24, 2013
  • #23
NIKwoaC said:
Decipha is a damn tuning wizard.
Click to expand...
Yeah, I have first hand experience, he tuned my last car. And as soon as I get my ass in gear he is gonna do my car again. Do your research before making assumptions.
 

mikestang63

SN Certified Technician
Aug 27, 2012
11,606
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In the garage
Dec 24, 2013
#24
  • Dec 24, 2013
  • #24
NIKwoaC said:
If you don't know who he is, Decipha is a damn tuning wizard. There are ways to cheat undersized injectors, and people do it every day, but there are a lot of corners that people cut with these cars across the board.

Plus I think Decipha is talking rear wheel and you're talking crank.
Click to expand...


If he's talking RWHP then yes, he is correct. Appreciate the clarification and again, no offense was being made and no assumptions either.
 

JD1964

there is enough sticking out to grab on to
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#25
  • Dec 24, 2013
  • #25
stykthyn said:
If you find you are leaning out WOT you can cheat and dial the pressure up.
Click to expand...

With regard to leaning out at WOT, are there symptoms that a driver would notice and if so, what would they be?

Otherwise, how would you determine of you are leaning out at WOT?
 

stykthyn

I want to measure mine. It doesn't look that tall.
15 Year Member
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Dec 24, 2013
#26
  • Dec 24, 2013
  • #26
Popping and pinging at wot. Without a wideband or being strapped to a fund there is no real way to know for sure.
 

srtthis

the guy doing it does every local racers rear end
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Dec 24, 2013
#27
  • Dec 24, 2013
  • #27
stykthyn said:
Popping and pinging at wot. Without a wideband or being strapped to a fund there is no real way to know for sure.
Click to expand...
do a wot pull and shut it off and coast. pull the plugs and look at them.
need fresh plugs to get a good reading.
 

f8tlfiveo

My wife likes my spool and blow-off valve.
Aug 8, 2007
1,585
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Dec 25, 2013
#28
  • Dec 25, 2013
  • #28
+1 for wideband..
 

JD1964

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#29
  • Dec 25, 2013
  • #29
Tell ya what I'll do. I'll swap the heads (new TFS springs included) intake, TB and switch to the 1.7 roller rocker arms. I'll put it all back together with the 19lb injectors, give the setup some time to adjust then take it in for a dyno pull.

We'll see what the tuners data says and take it from there.

Merry Christmas everyone. Be safe out there whatever you're doing.
 

JD1964

there is enough sticking out to grab on to
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#30
  • Dec 27, 2013
  • #30
I'm getting to like the wideband O2 idea. I'm the type that likes a hands on approach. The ability to see what's happening and make periodic adjustments to A/F ratio is something I'm interested in.

What are the recommended kits?
 

srtthis

the guy doing it does every local racers rear end
15 Year Member
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#31
  • Dec 27, 2013
  • #31
im a fan of the fast dual wideband set up. that way you can watch each bank
 

JD1964

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#32
  • Dec 27, 2013
  • #32
srtthis said:
im a fan of the fast dual wideband set up. that way you can watch each bank
Click to expand...

That sounds more expensive. Btw, how would you address each bank individually if they were unbalanced.

What is an entry level type kit that is viable and more on the affordable side?
 

JD1964

there is enough sticking out to grab on to
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Dec 27, 2013
#33
  • Dec 27, 2013
  • #33
I mean, I expect to make various changes to setup over time. So being able to see what's going on and adjust is the idea.

Stuff like- ok, time to change injectors, or raise/lower fuel pressure.
 

f8tlfiveo

My wife likes my spool and blow-off valve.
Aug 8, 2007
1,585
102
64
Lancaster, PA
Dec 27, 2013
#34
  • Dec 27, 2013
  • #34
160-200$ on eBay.. I have an aem kit I got for 160$, and I had a innovate lc-1 i used on my last car I paid 190$ either will be fine. Your not driving a full blown race car
 

NIKwoaC

中國製造
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Dec 27, 2013
#35
  • Dec 27, 2013
  • #35
I use this guy. It works pretty well.

http://www.aemelectronics.com/wideband-air-fuel-systems-15/digital-wideband-air-fuel-gauge-25/
 

JD1964

there is enough sticking out to grab on to
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#36
  • Dec 27, 2013
  • #36
This one looks affordable too.

Innovate Motorsports 3795 DB BLUE Complete Wideband Gauge Kit (2 1/16 52mm) with LC-1, O2 Sensor, Bung and Plug
http://amzn.com/B001QFH2RW
 

srtthis

the guy doing it does every local racers rear end
15 Year Member
Jul 3, 2009
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Dec 27, 2013
#37
  • Dec 27, 2013
  • #37
John Dirks Jr said:
That sounds more expensive. Btw, how would you address each bank individually if they were unbalanced.

What is an entry level type kit that is viable and more on the affordable side?
Click to expand...

AEM FJO or the LC1

the fast is about 400 bucks
 

f8tlfiveo

My wife likes my spool and blow-off valve.
Aug 8, 2007
1,585
102
64
Lancaster, PA
Dec 27, 2013
#38
  • Dec 27, 2013
  • #38
John Dirks Jr said:
This one looks affordable too.

Innovate Motorsports 3795 DB BLUE Complete Wideband Gauge Kit (2 1/16 52mm) with LC-1, O2 Sensor, Bung and Plug
http://amzn.com/B001QFH2RW
Click to expand...
This is the one I had on my old car. Worked good
 

f8tlfiveo

My wife likes my spool and blow-off valve.
Aug 8, 2007
1,585
102
64
Lancaster, PA
Dec 27, 2013
#39
  • Dec 27, 2013
  • #39
NIKwoaC said:
I use this guy. It works pretty well.

http://www.aemelectronics.com/wideband-air-fuel-systems-15/digital-wideband-air-fuel-gauge-25/
Click to expand...
Nice thing about this, does not need a free air calibration. The innovate does, and recommends one every year I think. Which requires you to unscrew it and put it out in the atmosphere to calibrate. Pain in the butt.
 

Decipha

Active Member
Aug 22, 2007
221
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39
New Orleans, LA
Jan 5, 2014
#40
  • Jan 5, 2014
  • #40
I recommend the ntk afx, its the most accurate low priced wideband money can buy

A close second is the aem

be sure no matter which wbo2 you get that you get it with a DIGITAL gauge ONLY
 
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