Injector Size Too Small on TRD S/C ??

[jetlounge]

So, now that we know the TRD injectors on the S/C kit are 400cc (see thread: TRD Injectors are 400cc), I am wondering if there are too small. Sure this is all academic, but if I go to a site that has a formula to find the proper injector the math is fuzzy. I went to http://www.injector.com/injectorselection.php and http://www.rceng.com/technical.aspx I use the following: Crank Horsepower: between 230-250 # of Injectors: 4 Consumption: between .55 and .60 Max Duty: .80 Why so high on the hp? We know that TRD advertised 200 hp, and soon learned from end user dynos that this was 200 at the wheels, not at the crank. Some a hair above, some a just a hair under. Factoring some value for drive-train loss (between 10-20% I arrived at that figure) since I don't think we have any verifiable dta on the crank horsepower for the s/c. So when I plug in those values, even being conservative it comes in way off. Not sure if I should be using different values for consumption or duty. I also am using the default fuel pressure. So, what does everyone else think? Is the math right?

[kikcaffine]

I believe someone calculated the drive train loss to be ~13%

[jetlounge]

so that means I was close..at 230 crank hp.

doesn't that mean 400 is too small? Using .55 - .60 and .80 duty cycle give you 415 - 450 cc requirement.

Anyone on the rest of the math?

[Crippie]

http://www.rceng.com/technical.aspx?UserID=835433&SessionID=w{swqICja63eegBooaaW#Conversion_Formulas

[2_much_tc]

i thought the injectors were 440cc?

[jetlounge]

Originally Posted by Crippie

http://www.rceng.com/technical.aspx?UserID=835433&SessionID=w{swqICja63eegBooaaW#Conversion_Formulas

i already posted that link.

my question was if 400cc was adequate for the numbers posted.

[jwaggz82]

the injectors surely are fine - if you arent running high in the duty cycle there is no reason to upgrade. The stock injectors can easily handle 260whp

[Crippie]

Originally Posted by 2_much_tc

i thought the injectors were 440cc?

i too believe that the sc injectors are 440s. Have you pulled them out to check?

[TongMan]

No. Stock TRD supercharger injectors are 410 cc

[2_much_tc]

Originally Posted by Crippie

i too believe that the sc injectors are 440s. Have you pulled them out to check?

if i knew how... i would.

[Crippie]

ah.. its cake... disconnect the battery. remove the plastic valve cover and that will expose your fuel rail. there should be two nuts either 8, 10, or 12mm holding it down. once those are removed, you can pull up your fuel rail and injectors. not sure about the trd injectors, but the rc injectors say the rateing on them without even having to remove the injector from the rail. once your done, just repeat the process backwards. if you do it, let me know what they are

[jwaggz82]

Im wondering why you care so much? We have proved twice they run full duty cycle at 285whp'ish

[THansenite]

Originally Posted by jwaggz82

Im wondering why you care so much? We have proved twice they run full duty cycle at 285whp'ish

A general rule of thumb is to keep injectors under an 80% duty cycle to prevent the injectors from going static and getting really hot.

[jetlounge]

Originally Posted by TongMan

No. Stock TRD supercharger injectors are 410 cc

No, actually they are 400cc

See here:
http://www.scionlife.com/forums/viewtopic.php?t=225714

[Crippie]

thats it? thats the smoking gun of proof that they are 400s?

[jwaggz82]

Originally Posted by THansenite

A general rule of thumb is to keep injectors under an 80% duty cycle to prevent the injectors from going static and getting really hot.

surely - which is why im keeping mine in my car when i up my boost and run around 260whp .... the ones i have now are a good fit for me.

[jetlounge]

Originally Posted by Crippie

thats it? thats the smoking gun of proof that they are 400s?

The CARB executive order? I would hope that was on the up and up. And if you merely didn't read the entire thread I actually posted the orders here:
http://blog.scionxtc.com/blogs/archi...n-xb-2008.aspx

or go to the California gov site yourself.

[hookedonlucy]

how do you check the CC numbers on the injectors?

[jetlounge]

flow test