I ordered the RTek 1.7. It says it expects to see secondary injectors of 720cc. I had mine flow tested and they come back at 690/699.

The question is: Is 690cc close enough to 720 cc not to cause a problem?

 

are you sure there not 700 cc?

 

I posted a WTB: 720 cc injectors

This is what somebody replied and they are the ones I bought.

"I have a fresh set..
Low impedence
Plug and play for S4 TII

Just had them gone thru By RC Engineering

$145.00 to your door for the pair

My paypal: xxx@yahoo.com"




I had them flowed at WitchHunter. WitchHunter also attached a note that states:

About average for old used injectors

Did I get ripped off????????????

 

$145 for 2 injectors? you got taken

 

Yep, I think so.... but, can I still use them for the Rtek 1.7 that calls for 720cc injectors?

 

I wouldn't use them unless you have some other way of increasing fuel flow (like safc). Having 5% less fuel may not cause your engine to blow (I haven't seen what the afr plot looks like with rtek 1.7), but it will increase the risk of failure due to improper fueling.

Josh

 

i would ask for a refund from the seller. it would be one thing if they were used and he didnt know, its another to say they were recently serviced.

 

I don't see much point in "upgrading" your engine with crappy old fuel injectors. New injectors are only about $100 each. Get Bosch, Siemens, or Denso, not Python/Venom.

The method for increasing fuel flow should only affect the secondary injectors so as not to run the primaries too rich.

 

I wonder why the guy was selling them... :P

 

The guy has answered more than 10 WTB messages in last couple of days. He must have access to new and used parts. I don't want to post his screen name yet, just in case he sent me the wrong injectors. BUT, if he doesn't offer a resolution, everybody will know not to buy from him.

 

THIS GUY IS ME!!!!

Nothing to hide here!
This thread is SUPER Presumptuous...and fact missing..

I have PMed ARAD99 twice now asking for him to call me ( provided my TEl #) or to give me his numder so that I can call him..

waiting!

 

Still no phone call..

Still has not provided me with a tel # to call him.

So since I cant get a direct response, I will respond here.

I NEVER said the injectors where BRAND NEW


Here is what I said, (DIRECT QUOTE FROM THIS THREAD)

"Originally Posted by Japan2LA
I have a fresh set..
Low impedence
Plug and play for S4 TII

Just had them gone thru By RC Engineering

$145.00 to your door for the pair

My paypal: japan2la@yahoo.com"

I said FRESH from RC Engineering..

Both injectors are from a Low mile Jspec Engine
Both got a full Service from RC, $25.00 per injector..
Cleaned
flow tested
patterened and matched
ALL new O-rings and pintle caps

This thread makes it seem like he got a dirty, high mileage, junky set of injectors for $145.00 which is NOT the case!

Post pics of the injectors so those who commented can see them..

Do the math

Injectors sold for $145.00 for the pair delivered

$50.00 to RC for a full service
$4.35 paypal fee
$8.00 in shipping
$1.85 in shipping materials

Total net for the injectors $80.80 for the pair or $40.40 each..

MORE THAN A FAIR PRICE!!!!!

Yes, I do have Brand new 720cc injectors.. They are $139.00 each plus S&H and paypal fees

That would come to about $296.00 delivered for a pair

I dont care what Witch hunters says..

I have the paper work from RC that says they flowed over 700cc at standard fuel pressure. With a upgraded fuel pump and fuel system, the will flow over 720cc per injector..

If you sent them to witch hunter, you just wasted your money..


Lastly, regardless of all this.... if you simply want a refund, send them back and I will refund your payment less the shipping cost and paypal fee thru paypal..

 

Japan2la is an awesome vendor here, i bought my injectors off of him and have no complaints. Will do business with again.

 

Why didn't you send him a copy of the RC Engineering paperwork along with the fuel injectors? It would have saved the buyer a lot of money, and it would have saved you a lot of grief. Maybe you should consider that for future sales?

With an upgraded fuel pump and fuel system running 47.4psi rail pressure to get those old injectors up to 720cc/min, the stock 550 primaries would flow close to 600cc/min, which would be too much to run well with a pre-tuned ECU upgrade. Sure, it would be fine with a full EMS that has individual injector trim, but that is not what the OP has.

 

Buyer never told me what his setup was and I did not ask... posted a WTB thread and I responded.. Payment sent, injectors shipped out...

 

I do have a question though..

My report from RC says both of those injectors flowed 702cc and 705cc if my memory is correct..

I know bumping the fuel pressue up will make them flow more....

My question is why will the extra Fuel pressure needed to get the 18cc +/- out of the secondaries result in pushing the stock primaries from 550cc to 600cc?

18cc gain on the secondaries and 50cc on the primaries??

How can that be???

 

I used the 690cc/min flow rate as specified by the thread title, plus I rounded off the numbers. Anyway, if you want to calculate on your own, the math is as follows:

Given:
- 690cc/min@43.5psi tested flow rate of lowest-flowing purchased injector
- 720cc/min@43.5psi desired flow rate of purchased injectors
- 550cc/min@36.95psi average stock flow rate and fuel pressure as per FSM

To calculate pressure needed to flow 720cc/min:
P2 = P1((F2/F1)^2)
P2 = 43.5((720/690)^2)
P2 = 43.5((1.04347826)^2)
P2 = 43.5(1.0888)
P2 = 47.36psi

To calculate flow rate of the 550 injectors at the new higher pressure:
P2 = P1((F2/F1)^2)
(F2/F1)^2 = P2/P1
F2/F1 = sqrt(P2/P1)
F2 = F1 * sqrt(P2/P1)
F2 = 550 * sqrt(47.36/36.95)
F2 = 550 * sqrt(1.281732)
F2 = 550 * 1.132136
F2 = 623cc/min

 

I've already installed the injectors so this is sort of an after-thought.
But, you should really have of told me that you had the injectors flow tested and that they flowed 702/705 since I was interested in 725cc injectors. First, I probably would not have wanted them and 2nd, if I had bought them, I would have saved another $40 by not having them re-flowed.

 

I did...



Here is a quote: "Just had them gone thru By RC Engineering"

^Maybe you missed reading this? or maybe you did understand what that meant?

Gone thru by RC means:
Cleaned
Flow tested
patterned
matched/balanced
New Orings and pintle caps

And as I explained earlier in this thread.. Those injectors will flow 720cc with the the correct fuel pressue.... as simple as a Walbro fuel pump and fuel pressure regulator... all of which you should already have when running the current setup in your car...

You decided without even checking with me to send them to WitchHunter, so that is on you... not me...

Anyway, all of this is pointless as you are now using them...

The End...

 

They will NOT flow 720cc with the correct fuel pressure. They will only flow 720cc with increased fuel pressure, which will cause the primaries to flow too much unless they are also flowing at a reduced rate due to age.

Well that is a pretty shitty attitude for a vendor, and it does not explain the discrepancy between the WitchHunter test and the supposed RC test which you have deemed necessary to hide. If you had included a valid RC test with the injectors you would have avoided this problem.

 

Your right, I didn't know what "gone thru" meant, especially after you said you had "a fresh set". Also, you know that you passed off a set of 700/705 cc injectors as 725cc injectors. That is why you never mentioned the flow specs. You thought I'd just throw them in and that would be the end to it.

 

Holy ****, this is getting a little crazy....

 

I offered you a full refund..

And I offered you a Brand New pair of Denso 720cc

I even gave you my phone number to call me directly

You opted out of all of my attempts to work out a resolution to your issue..

You never called..

You did not send the injectors back.

You did not decide to buy the NEW Densos's that I offered

I gave you plenty options...

 

Do me a favor and tell me how you are helping in this.. GTFO if all you want to do here is throw fuel on a fire.. You are not helpful..... "Supposed RC Test"..."Shitty attitude for a vendor".... Jesus Christ....enough is enough... What you are doing is against the user policy here.. Give it a rest already...

 

You are right. You did give me the options.

Enough is enough.