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Guest Message by DevFuse
 

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The Truth about RX Turbo Fuel Injector Flow Rates


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38 replies to this topic

#26 oddcomp

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Posted 04 August 2005 - 04:09 PM

hmm maybe i will try myx's flowed injector rating on my rx's fuel table and see how well it likes it ..
i have mine set for 80 cc a min on my megasquirt setup and it seems to run pretty good for a tired old motor

edit: my one key is borked .. so make that one eighty cc's

#27 the_postie

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Posted 05 August 2005 - 06:17 AM

some guy in new zealand fitted 1983 jaguar xj6 injectors into his rx.they fit straight in with a change of o-ring.possum Borne used these in his rx rally car in the day.

#28 soobscript

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Posted 30 August 2005 - 03:45 PM

Just got mine back from RC. Injectors from an 88 RX. #1 and #3 might be switched, but #2 and #4 are the correct cylinders.
Posted Image

#29 oddcomp

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Posted 31 August 2005 - 10:12 AM

btw according to a fuel psi conversion utiliity for one of my megasquirt tuneing programs
240 cc/min at 43psi converts to
219 cc/min at 36 stock suby psi

now i assume the 36 psi we are supposed to get is only at idle ect
or is that the max full boost fuel psi the regulator provides? since that might be useful to know

#30 calebz

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Posted 31 August 2005 - 11:22 AM

btw according to a fuel psi conversion utiliity for one of my megasquirt tuneing programs
240 cc/min at 43psi converts to
219 cc/min at 36 stock suby psi

now i assume the 36 psi we are supposed to get is only at idle ect
or is that the max full boost fuel psi the regulator provides? since that might be useful to know


Clayton, the Fuel Pressure regulator doesn't regulate at a straight 36 psi.

The regulator is setup to deliver a steady 36(point something) PSI above manifold pressure.

ergo, at 10 psi of boost, you should be seeing 46psi at the injectors

#31 Guest_shadow_*

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Posted 31 August 2005 - 11:26 AM

The Subaru regulators should be 36psi at atmospheric. Under vacuum the pressure should drop, and conversely rise under boost. I still have my megasquirt set to 185, although 219 would be the proper number given the test results as Clayton said. A regulator from a 42psi car would be an upgrade in addition to fuel management, giving you the maximum from the stock injectors.

#32 oddcomp

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Posted 31 August 2005 - 01:43 PM

wel if i tell ms my injectors are much bigger than 200 cc then it starts to bog down even at idle
and this is with stock xt spider non turbo injectors on a turbo rx.. so go figure

#33 oddcomp

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Posted 31 August 2005 - 01:46 PM

Clayton, the Fuel Pressure regulator doesn't regulate at a straight 36 psi.

The regulator is setup to deliver a steady 36(point something) PSI above manifold pressure.

ergo, at 10 psi of boost, you should be seeing 46psi at the injectors

thats kinda what i wanted to know is the when and where the max psi occured at

#34 oddcomp

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Posted 31 August 2005 - 01:54 PM

wow double post.. disregard one of these posts.. you choose wich one

#35 electryc_monk

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Posted 07 September 2005 - 09:19 PM

free bump/subscribes...

#36 Myxalplyx

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Posted 08 September 2005 - 05:43 PM

Just got mine back from RC. Injectors from an 88 RX. #1 and #3 might be switched, but #2 and #4 are the correct cylinders.
Posted Image


Off of what car, year, model are these injector flow rates in reference too?

#37 Subarutex

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Posted 08 September 2005 - 06:40 PM

I'm just guessing... but I bet it was a 1988 RX.

#38 soobscript

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Posted 09 September 2005 - 03:25 PM

I'm just guessing... but I bet it was a 1988 RX.

Correct!

#39 tizzle

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Posted 19 October 2005 - 08:35 PM

So I got my RX injectors back from RC engineering. The results were good. Interesting to look at the before and after picture

Posted Image

you can see the cleaned on the right. The gap is wider, and they all came back a different color? wierd

off my donor engine never actually ran in my rx:
before/ after
221--Dripping/ 238 exc
230--good /240-exc
235--good /242-exc
1 with electrical damage

replaced with injector from car
220--good /240-exc

Interesting how the one that was actually on my car, had a good spray pattern but, the worst cc/min




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