Correct Flow Rate of PTE 550cc injectors

[tte]

Hi guys,

What is the correct rating for the PTE 550cc injectors at 90% duty cycle?

I read Weezl had his Ptes at 50 lbs @90%...

Cheers,
Roy

 

[figgie]

well

I think they test thier injectors at 90% d/c.

 

[tte]

Hmmmm anyone here have flow data for their 550cc injectors?

cheers,
Roy

 

[starscream5000]

I think it's 80%, because most injectors max out at 80% duty cycle. Anyways, 90% is 495cc's or 47.1429 lbs/hr. At 80% it's 440cc's or 41.9048 lbs/hr.

Calculations for lbs/hr came from: http://www.racetep.com/rc2.html

And of course, just multiply the number of cc's in the injector by the % of duty you are wanting to run them at .

 

[figgie]

told ya!!

http://www.precisionturbo.net/fuelsys-display.php?company_id=101795&category_id=3058

@ 90%

 

[starscream5000]

specifically this page :http://www.precisionturbo.net/fuelsys-display.php?company_id=101795&category_id=3059

 

[aljordan]

550 cc injectors flow 550ccs of fuel wide open. Just like the stock injectors are 440s and are tested at wide open as per the TSRM.

To find what a 550 will flow at 90% DC, just multiple 550 by 90%.

Some additional tech info regarding injectors written by a dude at RC Engineering. Just for the people using search out there..

http://www.suprasonic.org/public_html/sonictech/fuel_injectors/RCtech.html

 

[starscream5000]

^Thanks for elaborating on top of my post. They probably understand it better now because I was a little vauge .

 

[Facime]

I called and talked to PTE directly to find out what the markings on the side of my injectors meant. The tech that I spoke with said that PTE tests their injectors at 90% duty cycle and they flow (in my case) between 50.5 lbs/min and 50.8

How that would be compared to other injectors that may be tested at 80% duty cycle...well you do the math.

 

[IJ.]

Test pressure plays a part as well

 

[Facime]

awe crap yes it does and I forget what they said it was. Off the top of my head I think 43lbs? isnt there an industry standard?

 

[lintlars]

yes PTE tests at 43.5 psi mine came back 50.2-50.7

 

[tte]

How do they test it?

Do they have a setup for the injectors and a electronic control that runs and varies the duty cycle from 0% - 100% or it is rpm based?

Cheers,
Roy

 

[Nick M]

So this would make the PTE injectors too big for the LEX/550 upgrade, knowing Toyota's test is at 100% for 15 seconds. I wondrer how many have had problems using this 580 injector and didn't know it wasn't a 550.

 

[Facime]

Nick, isnt that what a wideband and SAFC is for? Or an AFPR for that matter.

 

[Dirgle]

The original design for the lex/550 was a direct replacement with out having to fiddle. Of course over time people added things to tune the pig rich state out of the stock fuel maps. But the original design and calculations were made for a "drop and go" upgrade.

 

[Nick M]

Nick, isnt that what a wideband and SAFC is for? Or an AFPR for that matter.

I was going to say no. The SAFC was simply accomidating the incorrect injector size, now that we see in hindsight.

The factory 1UZFE injectors are calibrated to the anticpated airflow and meter size of the engine.

 

[Fuzz420]

Nice info in this thread, it got me thinking, i have rc 550's and i checked the sheet and they are tested @ 43 psi and 80% duty cycle

 

[aljordan]

People.... if you have 550cc injectors.. they flow 550cc's at 100% duty cycle, and 43.5 psi. The pressure is an industry standard, as is the sizing.

WHen you have an injector "tested" at 80%, that means they run the injector at 80% to ensure it'll work. It DOES NOT mean it flows 550ccs at 80% duty cycle. 550s should flow around 440ccs at 80%.

 

[aljordan]

How do they test it?

Do they have a setup for the injectors and a electronic control that runs and varies the duty cycle from 0% - 100% or it is rpm based?

Cheers,
Roy

Read that link I posted and it'll tell you everything RC does to an injector. Including how they test it.