+40's flowed?

[ShelGame]

Has anyone had thier "+40's" flow tested? Sepecifically, someone who has a set of +40's that seem to flow too much? I know there are sets out there that run way too rich when run on a +40 calibration. If we could figure out a flow rate for these "bad" injectors, it would be a big help to everyone.

If you have a set of these hi-flow +40's, please post the part numebrs that are on the injector, if you can (both Mopar and Bosch). I suspect that they may in fact be Bosch injectors for Ford that are rated to flow 52pph@43psi fuel pressure (not 55psi). But, I need the Bosch P/N to confirm that.

[Bubba]

I believe mine flow more than they should and this is on 2 separate engines. I got mine from Gary Donovan 6 years ago. I'll check the P/Ns when I get some time.

[ShelGame]

Anyone?

[mario03SRT]

Rob,

Sorry but I don't have any p/n's for you but I can testify to the richness of the tune and the "52 lb" injectors, with a STG V cal or the S60 cal. I'm running 25+psi on a 46 trim turbo with meth. Base fuel pressure of 45 lbs and still getting a 10.5 afr at redline. Take out a 1/2 point for the meth and it's still a flat 11.0 afr. HP is somewhere in the 350 range. I outta be near the end of the injector and have a fairly large duty cycle. I'll re-do the calc on RC Eng's site to be sure.

PS my injectors are 15 months old.

FYI,
Marion

[inmyshadow]

I believe my friend Jim aka nomandman2001 has his +40s tested after we tried my +40s in his car. He posted alot about this problem on dcal early 06.

He had to rescale his calibration because his +40s were more like +50s.

later

Anyone?

[Bubba]

Where do you have injectors tested and how much does it cost?

[ShelGame]

RC Engineering - cost is about $25 per injector. But, they not only test them, the clean and balance them as well. It's a nice service for the price. I did this to the used set of +20's I bought...

[ShelGame]

I believe my friend Jim aka nomandman2001 has his +40s tested after we tried my +40s in his car. He posted alot about this problem on dcal early 06.

He had to rescale his calibration because his +40s were more like +50s.

later

Yeah, I found that (I think) and it looks like his injectors checked out. He changed the O2 sensor to clear up a rich condition. Unless I'm looking at the wrong posts...

[lametec]

I have a set in my car that seem to flow a lot more than they should. I'll see if I can get the part number at lunch time.

[MiniMopar]

I have not had mine flowed, but I can tell you what I observed while tuning my cals between the CSX and the Daytona. The set of S60 injectors that I bought about two years ago flow about 10-12% more than the set I bought back in 1998. I thought I had a leaky one in the CSX, so I put the new ones in and noticed the difference.

[lametec]

4532586 made by Siemens/DEKA. Bought from FWD-P a few years ago.

Any cal I've had in my car with these has been rich from the get go.

[badandy]

I just bought some +40's from FWD right before I put one of Rob's cals in and I am still having to pull fuel out. I will try and check P/N and static press. and report back. I know the cal was based off a TII and scaled for the supposed +40 injector flow rate... but the variance in flow rates make this difficult to obtain. Without and ajustable reg. and proper a/f management it would be hard to make the cal right without flowing the injectors first (Iwould think)

I really think flow is all over the place on the +40 injectors

[inmyshadow]

His O2 was fouled out by the +40 injectors. It did the same thing after a 4 wire upgrade.

He still scaled his cal back because of the to big injectors.

later

Yeah, I found that (I think) and it looks like his injectors checked out. He changed the O2 sensor to clear up a rich condition. Unless I'm looking at the wrong posts...

[mo' parts]

the ones i had a few years back also ran pig rich, on both cals i used, s-60 and a stg. 5. with the s-60 it would actually flood the engine and make it near impossible to start. i believe i had my base set to 38-40lbs, just to have an acceptable idle.

[mario03SRT]

Shel,

I went on to the RC Eng site and came up with this. The assumption that 390crank hp = 350 at the wheels, which is my estimated hp. A 10% parasitic loss due to drivetrain.

Per their calcs @ 55 psi of base fuel pressure a 65 lb injector (rated @ 43.5 psi) is required and stay at a .80 duty cycle. Of course they do not say at what afr those numbers are for.

FYI,
Marion

[csxtra]

4532586 made by Siemens/DEKA. Bought from FWD-P a few years ago.

Any cal I've had in my car with these has been rich from the get go.

I checked my +40s last night (while swapping out one that was marginal-getting knock in that cylinder only). They are the same manufacturer/part # as Per (lametec) posted above, and I had to cut down my base FP to get them to run right.

Also, I had purchased my original +40s from FWD-P 5 years ago, and the new ones I just purchased are the same manufacturer/part # as the old ones, so I can't help with identifying an individual batch of "bad" injectors, if they exist.

[kpic]

Funny I was just going to post a question about this when I saw the thread.

I bought my +40's from FWD Perf. in early 2004, I have a MFG P\N of: 5249452 (this is on the invoice so I think it might be the set number)

I got the S5 CAL at the same time and figured I had to turn down the FP way down (to like 35psi) because everyone said it ran rich and then I got a TU CAL and had to still turn down the FP and even with Robs CAL I have had to turn it down to 45psi.

If these flow like +50s does that make the correct FP 45psi? Or is there more to it than just turning down the FP?

I was going to get new +40s from FWD or TU to correct this suspecting I had a bad batch that I heard were around at that time but if FWD still shows the same PN does that mean they flow too much as well?


Can we

[mario03SRT]

I wanted to add that my afr got richer after installing a Hi Pressure 255 Walbro.

[mark]

mario, when you upgraded your pump, did you upgrade your return line too?

[mario03SRT]

mario, when you upgraded your pump, did you upgrade your return line too?

No it is stock. I'm pushing 27 psi on a T3/T4 46 Trim and i have plenty of fuel. But it is on my radar to be upgraded. I'll just swap the feed line to the return since it is larger and then run a new line from the fp to the rail.

Also I'm running water/meth inj too.

Marion