Ok long story short, i bought some injectors off of the board and didn't do much research until i got them. Well, now that i have them i have been doing some readying and am wondering... what do i actually have lol.

Ok here is the deal. I bought them as 800cc injectors. The thing is is that they are stock red injectors that have been Modified by KGParts.com. KG part's website says that when they modify them they can add 47% more flow then the stock injectors. If stock red injectors flow 290cc that means at 47% more they would flow 426cc's.

Now, the flow sheet that i have from KGParts that i received with the injectors says that each injector is flow matched at 800cc/min @2.25 bar. Even then arnt most injectors rated at 3 bar or 43.5psi?

So if i could get a little help here - - - - what exactly do i have my hands on here. 290s , 426s, or are they actually 800cc injectors as the sheet says. Sorry for the odd questions but i am somewhat lost here. Thanks guys

 

Without flow testing them...you really have no way to know

For $25 send them in and find out

 

Well in my mind, its not possible for 290cc injectors to be modified into 800cc injectors.... is it? lol

 

I'm not sure what you would call them if you wanted to place them in a lineup, but if you have the data sheet from KG parts and the ends have been visually opened up, then they flow what KG Parts says they flow. You could give KGParts a call and ask for an explanation. If they were 290s to start (and if you look up the model number, Denso probably calls them 225s), KGParts advertises that they can get them to 650 or 680 (I forget). When I got my yellows back, they were flow matched to 820 at 2.25 bar above the advertised 750. Raising the pressure should increase flow by about 15% between 43.5 psi and 33 psi.

However, does it matter? You don't run 43.5 psi fuel pressure in an Rx8. I think generally you're up around 55-60 psi. Now if you had the flow at 2.25 or 3 bars, you'd still be transposing it to a new pressure. The internals of the yellow tops and red tops are probably the same with only the spray pins size/number/location changed to yield a desired result. With manually redoing that spray pattern, it doesn't surprise me that you get roughly the same output out of them.

 

So your saying that they most likely are the 800cc that KGparts specified... or rather 920cc @ 3 bar. thats quite the jump to go more then three times the original size if thats true. crazy

 

Have you looked at the injector end? A stock injector fires gas through pin holes. Actually, it doesn't really fire anything. It merely uncovers them and the fuel pressure drives the fuel out. Take 5 pin holes and make that a single 1/8" diameter hole and you've increased the flow area by a ton. The effort of the solenoid to block the larger hole versus the pin hole is the same. The fuel injector body does not need to change. I'm just guessing this, but I'd probably assume that a denso 750 cc injector and a 225 cc injector have mostly the same design and parts with only altered spray windows. Now Denso might decide that having a field of pin holes spaced in X pattern is 10% better for atomization than having a flood gate so maybe they redesign around a larger diameter body for more space, but maybe not.

Look at a 195500-4460 50# (528 cc) injector - high impedence/denso connector.
http://injector-rehab.com/images/inj...95500-4460.jpg
Now a 195500-3110 15# (160 cc) injector - high impedence/denso connector.
http://injector-rehab.com/images/inj...95500-3110.jpg

I bet mechanically those two injectors are the same parts with altered spray windows. KGParts can probably tell you infinitely more about these things than I can. I just was looking into it as I had a pile on fuel injectors on my desk and was trying to decide what I wanted to run.

 

Glad to see you received the injectors Phish, yeah man give KG a call, also if you look @ the bottom tip of the injectors you can see they removed that part

 

Yeah no doubt that they modified the injectors. I jsut noticed that they contridict thierself on the site by saying 47% increase then show a 200% increase on the flow sheet.

 

I use KG parts modded injectors. The sheet is probably correct. Mine flow 850cc. They work perfectly.

 

were yours stock reds?

 

Stock yellows. But my point is that the flow sheet they send are most likely correct. They're a reputable company.

 

I agree they are a reputable company, just kinda caught me off guard i guess. 800cc/min they are. Thanks guys