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24lb injectors big enough? 

 

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 Post subject: 24lb injectors big enough?
Posted: Tue Aug 22, 2006 11:31 am 
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Im in the process of putting a powerdyne S/C on my el xr6 ive installed new high flow 24lb injectors and a walbro fuel pump will this be enough for 6-9psi? and will i need a rising rate fuel reg?

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Posted: Tue Aug 22, 2006 12:19 pm 
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You'll definately need a rising rate reg for 24s. Probably looking at 36/42 pounders to run at a flat fuel pressure.

Maybe a 6:1 or an 8:1 rising rate for 24s....

The walbro will provide enough fuel.

How much power you chasing? What ECU?

 

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Posted: Tue Aug 22, 2006 12:25 pm 
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dunno how much power id be happy with 200rwkw im runnin a chiptorque HP6
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Posted: Tue Aug 22, 2006 6:58 pm 
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the best possible advice, although most people building forced cars on a budget dont like to hear this, is buy a nice aftermarket management, a 1:1 reg, and for the power you want, some ford motorsport 42lb injectors...

its going to be a hell of a lot better outcome, than trying to use rising regs and std managment. with the added bonus, of, when the boost bug bites (which it will) you then have to option to throw watever you can imagine at it

 

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Posted: Tue Aug 22, 2006 7:19 pm 
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yer ill see how it goes if it works out then yay, im only goin for a mild set up so i should be right.
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Posted: Tue Aug 22, 2006 7:29 pm 
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I ran a v8 with 19# injectors and a 12:1 FMU for almost 2 years with about 7.5psi boost.

Never skipped a beat, but wasnt ideal... got some killer power drops throughout the range as a result of air fuel ratios being a bit out as a result of the FMU.

Can probably see this in my 170kw dyno run in the user gallery.

 

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Posted: Tue Aug 22, 2006 7:41 pm 
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after a 10 min think i might go the 42's is the standard XR6 reg 1.1, anyone need 8 new 24lb injectors :oops:
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Posted: Tue Aug 22, 2006 7:42 pm 
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Yeah, standard/xr6 fuel reg (doesnt really matter which one, so long as its tuned properly), big injectors and a good tune will be a much better option.

 

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Posted: Tue Aug 22, 2006 7:50 pm 
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yer i gona have to do it that way.

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Posted: Tue Aug 22, 2006 9:30 pm 
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yeh i would go for the 42's, may i ask my u ported your head and got a good cam for 200rwkw, when the standard xr6 setup is good for 220+ most forced induced stnadard xr6's are making around 230rwkw on 10-12 psi

 

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Posted: Tue Aug 22, 2006 9:44 pm 
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err the head and cam where done over a year ago
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Posted: Tue Aug 22, 2006 10:00 pm 
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ebs_4l wrote:
the best possible advice, although most people building forced cars on a budget dont like to hear this, is buy a nice aftermarket management, a 1:1 reg, and for the power you want, some ford motorsport 42lb injectors...

I really dont think that is the best advice...far from it.

Its a mild blower, and its never going to make more than 8-9psi. And being a centrifugal supercharger there is no chance of it spiking boost...very predictable.

He already has a 1:1 regulator.

He already has a Chiptorque chip (aka edit).

EL-XR6, your best option is to sell off the 24lb injectors and get yourself some 36lb injectors (or 42's). The standard computer with a (custom tuned) Chiptorque chip will handle that without any dramas at all.

The other option is to run the 24lbs and up the rail pressure to 60psi....this will give your fuel pump a hard time, but no more than a rising rate reg. A Walbro GSS-341 should be OK.

An FMU/rising rate reg is your last option, but I would avoid it if you can. You will get much better results with a good tune, and the right sized injector (and a fuel pump to match).
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Posted: Wed Aug 23, 2006 1:46 am 
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xr8ute wrote:
I really dont think that is the best advice...far from it.

lol, how far from it are you talking, there wasnt a hell of a lot of advice variance, so lets get picky

xr8ute wrote:
Its a mild blower, and its never going to make more than 8-9psi. And being a centrifugal supercharger there is no chance of it spiking boost...very predictable.

i did say the boost bug will/may bite, and therefore, why not cover your bases now, trying to help the lad from having to change his management down the track, after hes invested all his money in a compromising chip tune

xr8ute wrote:
He already has a 1:1 regulator.

not a problem, then you can leave that piece of advice out of what i said, it leaves him with a smaller list

xr8ute wrote:
He already has a Chiptorque chip (aka edit).

which i would not recommend to anyone trying to run a forced car, and certainly wouldnt recommend it for user friendlyness

xr8ute wrote:
EL-XR6, your best option is to sell off the 24lb injectors and get yourself some 36lb injectors (or 42's).

we agree on that part, except i wouldnt bother with 36's, YES, you may point out that they CAN flow the required fuel, but, for the sake of having something up his sleeve for the future, AND the fact they are the same sort of price, then why not buy the bigger ones


xr8ute wrote:
The standard computer with a (custom tuned) Chiptorque chip will handle that without any dramas at all.

and how many tuning shops can handle doing that??

xr8ute wrote:
The other option is to run the 24lbs and up the rail pressure to 60psi....this will give your fuel pump a hard time, but no more than a rising rate reg. A Walbro GSS-341 should be OK.

you said he already had a 1:1 reg? therefore, not needing to buy another 1, how do you suggest he runs 60psi rail pressure with it?? unless ive missed something, the only 1:1 reg i know of him having is the std one, do you suggest he squashes it in a vice or something to crank up 60psi...

what sort of flow number will the walbro produce at 70psi??

xr8ute wrote:
An FMU/rising rate reg is your last option, but I would avoid it if you can. You will get much better results with a good tune, and the right sized injector (and a fuel pump to match).

yes

lol, how is that better than my advice??

try finding anyone, anywhere that you can drive in and get a chiptorque eec tune done?? drive into any dyno shop worth there money with any off the shelf management and you wouldnt have a problem, he'd also drive in with 36lb injectors, find they run dry, have to turn around and buy some bigger ones, and waste the time spent on the dyno

as 36lb'rs re only realistically capable of 240-250kw at the engine

 

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Posted: Wed Aug 23, 2006 10:34 am 
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do they have to be ford motorsport 42lb or can i get any 42lb that fits?

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Posted: Wed Aug 23, 2006 8:48 pm 
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im with ebs_4l

EL-XR6 wrote:
do they have to be ford motorsport 42lb or can i get any 42lb that fits?

Cheers


depends on if u use the eec and chip or u go for the aftermarket ecu, with the eec i would say u would be restricted to a certin resistance, if u use anything that works on a ba it will be fine.

the fordmotorsport injectors will be fine for wat u want, and u can pick them up real cheap on ebay.

 

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