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**Howerton Engineering** · 11-12-2011, 11:08 PM

The line from the FAV to the jet is not overly long with this install, but the fact that it is mostly down hill may have the line slowly draining after a shutoff. During driving if one slow drip were to occur, it would immediately get sucked up and evaporate. This is not the first time this possible issue has arisen, albeit on other cars. We can place a CV right at the jet to hold the line full. Another option is to move the FAV closer to the jet, but since we told everyone to install it elsewhere, this is not the best option. We can get a CV to Erik and Sil and see if this curbs the issue. If it does we know the fix, if not we look at it again.

Buli · (This post was last modified: 11-12-2011 11:12 PM by Buli.)

(11-12-2011 10:57 PM)BostonR56S Wrote:
(11-12-2011 10:55 PM)Buli Wrote: I can't picture what type of check valve would help your problem. Maybe your FAV has debris in it and is leaking.

Fav is supposed to be mounted as close to the jet as possible. The fav isn't leaking. There is water left in the hose between the fav and nozzle after the car is off, which may be what is leaking. A check valve at the nozzle stops this extra water between the fav and nozzle from leaking out of the nozzle.

If the FAV is not leaking how is would anything get out of the jet? The water could expand slightly from heating but it seems unlikely to cause your issue.

Jeff is it a spring loaded Check valve?

BostonR56S · 11-12-2011, 11:15 PM

(11-12-2011 10:58 PM)silhouette88 Wrote: I'm not sure if this adds any usefulness, but reading Erik's last post about a possible slow leak after the engine is off made me think of it. On occasion when I turn the engine off, go do something for an hour, then come back and start driving away I have a noticeable stumble / hesitation in 1st gear that feels worse if I stay in 1st and apply more throttle. After shifting to 2nd the "stumbling" goes away and everything is fine. It doesn't happen all the time. Sorry if this is a red herring.

I've been getting this as well. Is it different than your stumble you had told me about in the past, before your wm? That issue went away after I reset battery for some reason, and now this stumble has come up after wm, but is definitely different than the stumble I used to get.

And, thanks Jeff I'd be happy to test it out and report. For now I'll keep track of any loss of water after the engines been off

silhouette88 · 11-12-2011, 11:22 PM

(11-12-2011 11:15 PM)BostonR56S Wrote: I've been getting this as well. Is it different than your stumble you had told me about in the past, before your wm? That issue went away after I reset battery for some reason, and now this stumble has come up after wm, but is definitely different than the stumble I used to get.

It feels similar, but to a higher degree I think. The initial stumbling definitely went away after the w/m install, but the battery was also disconnected so it's hard to say what actually caused it to go away. But the initial stumbling seemed like it happened in higher gears. This stumbling always happens right when I start up the car, let it idle for 30 sec or so and then drive away. And I can always count on it going away after I let off the throttle a bit and then get back on the throttle. It was so minor to me that I never bothered reporting it here.

**Howerton Engineering** · (This post was last modified: 11-12-2011 11:30 PM by Howerton Engineering.)

(11-12-2011 11:10 PM)Buli Wrote:
(11-12-2011 10:57 PM)BostonR56S Wrote:
(11-12-2011 10:55 PM)Buli Wrote: I can't picture what type of check valve would help your problem. Maybe your FAV has debris in it and is leaking.

Fav is supposed to be mounted as close to the jet as possible. The fav isn't leaking. There is water left in the hose between the fav and nozzle after the car is off, which may be what is leaking. A check valve at the nozzle stops this extra water between the fav and nozzle from leaking out of the nozzle.

If the FAV is not leaking how is would anything get out of the jet? The water could expand slightly from heating but it seems unlikely to cause your issue.
Jeff is it a spring loaded Check valve?

Usually you can hold the jet and line straight down and it won't leak. Like putting your finger over a straw and lifting it. But every once in a while the jet and line are at the right angle and the fluid left in the line from the FAV to the jet can slowly drip out of the jet, being replaced by air. The standard check valve we have is a 15psi, so vacumm cannot draw it open, but the system spraying has no issue. I'll send these to Erik and Sil. I'll see if I can get some special 1 or 2psi valves made, and see if they also work. The lighter pressure would not affect how the system is setup, but would prevent any drip.

Yes it's spring loaded.

(11-12-2011 11:22 PM)silhouette88 Wrote:
(11-12-2011 11:15 PM)BostonR56S Wrote: I've been getting this as well. Is it different than your stumble you had told me about in the past, before your wm? That issue went away after I reset battery for some reason, and now this stumble has come up after wm, but is definitely different than the stumble I used to get.

It feels similar, but to a higher degree I think. The initial stumbling definitely went away after the w/m install, but the battery was also disconnected so it's hard to say what actually caused it to go away. But the initial stumbling seemed like it happened in higher gears. This stumbling always happens right when I start up the car, let it idle for 30 sec or so and then drive away. And I can always count on it going away after I let off the throttle a bit and then get back on the throttle. It was so minor to me that I never bothered reporting it here.

Good or bad, we always want to know about any issues to improve the kits. Sometimes there maybe no fix or nothing practical, be we do want to improve the kit.

silhouette88 · 11-12-2011, 11:37 PM

(11-12-2011 08:15 PM)BostonR56S Wrote: This is why Jeff kicks ass. I sent him my first email about this a mere 30 min ago and we have already went back and forth with several emails. It's SATURDAY NIGHT! Amazing, thanks Jeff.

True story. I can't say enough good things about Jeff, and I just met him. lol

And look, it's STILL Saturday night! Why are we all on the forum chatting instead of out drinking and raising hell?? Big Grin

**Howerton Engineering** · 11-12-2011, 11:43 PM

Who's not drinking?

Buli · 11-12-2011, 11:55 PM

White Russian tonight for me. I watched "The Big Lebowski" last week and I am feeling like the Dude!

silhouette88 · 11-13-2011, 12:01 AM

Certainly not I. Big Grin

I'm working on the the $3 Samuel Smith now... where the hell was this stuff back when I was a starving college student?

RennSport Racing · (This post was last modified: 11-13-2011 07:31 PM by RennSport Racing.)

Hey Jeff, I've noticed that the system sprays more in the midrange than the top end, is this because the load, and thus the IDC, is higher in the midrange?

What IDC-gain setting do you think would be best for an R56 JCW? I can't get to a dyno or even a track to test out which setting I get most power from. I'm running 50/50, but I'm thinking of running 75/25 on the next tank.

Finally, I've noticed that on the overrun, sometimes I see one bar of flow on the gauge. Is that normal?