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Discussion Starter #1
Does anyone know, it would be interesting to know this.

Just for comparison sake...and could we use them if they are larger? And how much are they?
 

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well you'd have to get your MAF recalibrated and ECU chipped for the different injector size.
 

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Discussion Starter #3
yaya...blabla...


what size??????????

None of this stuff is proven...i know a few people with STOCK calibrated mafs, a chip and 24lb injectors doing perfectly fine...this whole calibrated mafs...who know, some do it, some dont...personally, i would like to have as little to do with proFLOW mafs as possible to rely on fuel, i am not fully trusting their methods yet

WIth that said, WHAT SIZE ARE THEY?

Just to compare, thats all.

I dont know if i should get 20lb or 24lb injectors...
 

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Originally posted by nazthug:
yaya...blabla...


what size??????????

None of this stuff is proven...i know a few people with STOCK calibrated mafs, a chip and 24lb injectors doing perfectly fine...this whole calibrated mafs...who know, some do it, some dont...personally, i would like to have as little to do with proFLOW mafs as possible to rely on fuel, i am not fully trusting their methods yet

WIth that said, WHAT SIZE ARE THEY?

Just to compare, thats all.

I dont know if i should get 20lb or 24lb injectors...
<font size="2" face="Verdana, Arial">oops...guess i should have payed attention to the person who started the thread....of course you know that....n/m
 

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Discussion Starter #6
just talking out of my experienced ass right guys>?

Dont know, but ive seen it done plenty of times, very succesfully...

ANYWAYS

I just wanted to know, THATS IT, just to compare what the SVT needs vs me.

Nader ...u said 30;s before, but that just sounds HUGE...i cant imagine them needing to put that in...can someone verify?
 

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I believe the svt has 3x lb flue injectors. I would call ford dealership and ask the parts departent. Below is the a/f ratio with rpm of a focus svt dyno. look at how rich it gets at the higher rpm's. Does the a/f needs to be 11.5? I think that is too rich.

rpm a/f ratio
2485 14.7
3065 14.2
3894 13.3
4640 12.7
5220 12.2
5468 12.1
6048 11.8
6214 11.6
6379 11.5
6628 11.4
6794 11.5

[ 10-14-2002, 04:09 PM: Message edited by: lourenco ]
 

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30# does sound large but maybe they had the aftermarket in mind when the put em in....
 

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Originally posted by Egz:
Think we would ever know what they are? We can't even get a straight answer on a stock Focus...
<font size="2" face="Verdana, Arial">speaking of which, arent the stockers 19?
 

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Naz yes you MIGHT get by with a set of 24`s and not do the maf

but keep in mind part of the reason for doing the maf is to move the 5volt up so you dont hit it not just for the injectors

Not sure what size nader/dennis is useing but we are maxing out the 36`s we have in the 192hp n/a car,,going to 42`s with the new sheet metel intake

tom
 

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Discussion Starter #12
Originally posted by lourenco:
I believe the svt has 3x lb flue injectors. I would call ford dealership and ask the parts departent. Below is the a/f ratio with rpm of a focus svt dyno. look at how rich it gets at the higher rpm's. Does the a/f needs to be 11.5? I think that is too rich.

rpm a/f ratio
2485 14.7
3065 14.2
3894 13.3
4640 12.7
5220 12.2
5468 12.1
6048 11.8
6214 11.6
6379 11.5
6628 11.4
6794 11.5
<font size="2" face="Verdana, Arial">HOLLY ****, just by tuning the a/f on a SVT focus you should gain like 10-15whp....

damn thats WAYWAYWAYWAYWAY too rich....

This is a first, thats huge news guys, strap on a apex fuel controller, lean it out and watch, i bet you can hit 160whp without even any mods...

Tom, i dont think i will ever use all of the 24lb injectors if i got the, i dont think i can go too much over 170whp without going crazy with this NA thing, RPM, rough idle, huge headers, cams....compression

I would like to hit 170whp and still have nice low end, good idle, 7000rpm redline and my 10.5:1 compression

Because later, i still plan to go boosted ya know? Im gonna go step by step, im gonna build the bottom end to do both, work well with my NA setup now and beat up on it, and be also setup for some boost, no more than 15psi though...

so the project goes on...
 

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Originally posted by nazthug:
Tom, i dont think i will ever use all of the 24lb injectors
<font size="2" face="Verdana, Arial">If you're hittin 4.88v on a stock MAF curve you need every pound of those 24 lb/hr injectors.

For a 13.2 a/f you'll use 22.7 lb/hr fuel.

I'm just puting together a setup similar to yours (got my head back today) and I'm gettin rid of my 24s and going to 30 or 32 just based on your numbers. Looked for 36s but they were hard to find.
 

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Originally posted by Egz:
Think we would ever know what they are? We can't even get a straight answer on a stock Focus...
<font size="2" face="Verdana, Arial">I had my stock injectors checked on a flow bench. They are about 19 lb/hr.
 

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Discussion Starter #15
i just dont get it, why you would ever need such larger injectors

the FC race car, at 194whp, is on 30lb injectors, and have the pectel tuned WAY down on fuel because it was WAY too rich..i dont get it..

Eric is runing 158whp wiht the same package as me but 24lb injectors....and he had his cheap LEANED out and is still geting 12.5 or so a/f

I am aiming for a/f at about 13.5 which i think is perfect for an N/A car...

im not arguing, im just tryina figure out which is the best size for me, guess i just gotta take it to a wideband

I kinda wanna bring with me some 20lb and 24 lb injectors and swap them right there and then and see which gives me the best a/f ratio

[ 10-14-2002, 08:04 PM: Message edited by: nazthug ]
 

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Originally posted by nazthug:
</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by lourenco:
I believe the svt has 3x lb flue injectors. I would call ford dealership and ask the parts departent. Below is the a/f ratio with rpm of a focus svt dyno. look at how rich it gets at the higher rpm's. Does the a/f needs to be 11.5? I think that is too rich.

rpm a/f ratio
2485 14.7
3065 14.2
3894 13.3
4640 12.7
5220 12.2
5468 12.1
6048 11.8
6214 11.6
6379 11.5
6628 11.4
6794 11.5
<font size="2" face="Verdana, Arial">HOLLY ****, just by tuning the a/f on a SVT focus you should gain like 10-15whp....

damn thats WAYWAYWAYWAYWAY too rich....

This is a first, thats huge news guys, strap on a apex fuel controller, lean it out and watch, i bet you can hit 160whp without even any mods...
</font><hr /></blockquote><font size="2" face="Verdana, Arial">I believe those numbers are from Terry's car (my2002svt) right? If so, he's currently getting like 157 whp right now, with only a cheap little PepBoy's cone filter on there.

We just need someone to crack the SVT's ECU codes and come out with a chip one of these days. Would also be interesting to see what other kinds of numbers are possible with modifing when the short runners kick over. Maybe some more mid-range power? who knows...
 

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Okay, as much as I hate it, it's time for some math. My fiancee (math teacher) would be so proud.

Since all of my reference manuals are at home, there may be some error in the explaination, but the math is sound.

Brake Specific Fuel consumption is basically the amount of fuel required to make 1 horsepower. This number varies throughout the rpm range, but on average it ranges from .45 to .55 pounds.

Now for the math. Lets assume the worst and say it takes .55 pounds of fuel to make 1 horsepower. This means for every pound of fuel you will make 1.82 HP, or for every 1.82 hp you will require 1 pound of fuel.

therefore, Injector size x #of injectors x 1.82 = maximum supportable HP

4 injectors x 1.82 = 7.28

7.28 x injector size = max HP at 100% duty cycle.

7.28 x 30 = 218.40
218.4 max HP for 30# injectors at 100% duty cycle with a BSFC of .55

At .45 BSFC the same injector would support 266.4 HP at 100% duty cycle.

Hope that helps

I forgot to mention, that's at whatever pressure the injectors were rated at.

[ 10-15-2002, 10:48 AM: Message edited by: Greg Dantzler ]
 

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I have a Pectel, but I won't be helping anybody with such an offensive screen name. Thanks.
 
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