what pound injectors do i have?

[2.3L_turbo]

so when i bought my new motor it had blue injectors. i know that a stock 4G63 has orange injectors so they r upgraded and i dont know what pound they are. do u guys know lol

[steviek]

we can't tell just from what colour they are.

[tfoti]

Originally Posted by steviek

we can't tell just from what colour they are.

Actually, you can:

210cc light tan top
240cc orange/pink top
390cc tan top
450cc blue top (95+ are black top)

EVO 4G63 injectors:
510cc yellow top
560cc red top

[2.3L_turbo]

holy crap so ur sayin i have 450 pound injectors
sweet more boost

[tfoti]

Yeah if you have any turbo model. Except for 1G Auto. They came with 390's. It's not measured in LBS, it's in CC's.

[SilvrEclipse]

Originally Posted by tfoti

Yeah if you have any turbo model. Except for 1G Auto. They came with 390's. It's not measured in LBS, it's in CC's.

Actually injectors are also measured in lbs/min. 2.3L was referring to the cc's but injectors are measured on both units.

[defiancy]

V8 /domestic injectors are usually in lbs, imports are almost always in CC's.

Here is a cool little injector worksheet. It can help you if you need to convert from lbs to CC's or vice versa for any reason.

http://www.rceng.com/technical.aspx

[kjewer1]

You can skip this post if exact numbers don't matter to you.

The problem with that and all other online calcs is that none of them take Specific Gravity into account. When converting between volume flow and mass flow you need this SG value to be included. I'm sure they just use some common value when they come up with the 10.5 number, but most DSMers use both pump gas and race gas, which are quite different.

To make an example, a stock 450cc/min injector would be a 45 lb injector on pump gas, and a 41.5 lb injector on the lightest race gas. That translates into a 3 lb/min or 30 hp difference in what those injector will support.

If you need rough numbers, the online calcs will work. But if you need exact numbers to verify injector flow or airflow meter or WBO2 accuracy, take the fuel's SG into account in your calculations.