Coyote Lund tuning help

[cfriedman67]

I have a coyote gen3 and have done my first log with Lund. They sent me back instructions but one thing is confusing me. They say “ For the fuel system you need to get the regulator to 55 psi with NO vacuum reference on the fuel pressure regulator. Once the fuel pressure is set leave the port on the regulator open to atmosphere. I have an aero motive fuel regulator . Part # AEI-13129. I have hooked everything up according to factory five. I have also adjusted to regulator to read 55 when I turn the key to on. Can someone explain what they mean?

Thanks

[Hacksaw84]

That vacuum port nipple on the top half of the regulator, do not connect anything to it. Leave it open to "atmosphere".

Once you are done you can put a threaded plug in there just to keep it protected.

Its mostly only "needed" if you have forced induction of some kind.

Also, I am pretty sure gen 1&2 is 55 PSI and Gen 3 is 65 PSI? Double check that. And you want to adjust/check it with the car running too (not just key on).

[cfriedman67]

150914
The thread piece coming out of the top is the way a can change the pressure. Which port are you talking about? Also, Lund says set to 55.

Thanks

[BradCraig]

I have a coyote gen3 and have done my first log with Lund. They sent me back instructions but one thing is confusing me. They say “ For the fuel system you need to get the regulator to 55 psi with NO vacuum reference on the fuel pressure regulator. Once the fuel pressure is set leave the port on the regulator open to atmosphere. I have an aero motive fuel regulator . Part # AEI-13129. I have hooked everything up according to factory five. I have also adjusted to regulator to read 55 when I turn the key to on. Can someone explain what they mean?

Thanks

Gen3 calls for 65 psi fuel pressure, lund must think you have older Coyote.

[cfriedman67]

i see in the Ford instructions 65 psi.

[edwardb]

150914
The thread piece coming out of the top is the way a can change the pressure. Which port are you talking about? Also, Lund says set to 55.

Thanks

What they're talking about is where you have the rubber hose attached. With the tie wrap. Remove it and plug the end of the hose. You don't want an open vacuum source to the engine. The Aeromotive instructions say if you aren't using the vacuum reference, leave it open to atmosphere. Don't plug the fitting. They say it would lead to inconsistent performance. Also agree the Ford instructions say 65 psi. That's what I had mine set on when Lund did my tune. Also the Ford instructions say to set it with the engine off. Meaning you have to be watching the gauge when someone else turns the key on because the pump only runs briefly. But it quickly peaks to the dialed setting. Repeat and adjust until it's at the right pressure.

[cfriedman67]

Ok. I will detach the rubber hose from the regulator and leave it open. I will also detach the hose from the engine and plug that port as well. Appreciate the help.

Craig

[Jones375]

I have a gen3 and went with Lund for tuning as well. I got the tune a few days ago and the instructions said to turn the fuel press’s down to 55 psi as well. I’ve run it a for probably about 10 miles and it drives fine. I haven’t data logged it yet. I’ll ask if the 55 is correct then if cfriedman doesn’t beat me to it.

[BEAR-AvHistory]

With LUND can you still use the X4 or go you need to buy their box?

[JohnK]

Is the general consensus that Lund recommends not connecting the pressure regulator to a vacuum source? I'm about to make the CMCV line for my gen2 coyote as shown in this thread (https://thefactoryfiveforum.com/showthread.php?22472-Important-Information-Regarding-2015-2016-Coyote-CMCV-Plumbing), but if the vacuum line is not needed I'll omit that from the CMCV line.

[BEAR-AvHistory]

Is the general consensus that Lund recommends not connecting the pressure regulator to a vacuum source? I'm about to make the CMCV line for my gen2 coyote as shown in this thread (https://thefactoryfiveforum.com/showthread.php?22472-Important-Information-Regarding-2015-2016-Coyote-CMCV-Plumbing), but if the vacuum line is not needed I'll omit that from the CMCV line.

Yes

[cfriedman67]

I have a gen3 and went with Lund for tuning as well. I got the tune a few days ago and the instructions said to turn the fuel press’s down to 55 psi as well. I’ve run it a for probably about 10 miles and it drives fine. I haven’t data logged it yet. I’ll ask if the 55 is correct then if cfriedman doesn’t beat me to it.

I emailed with Lund racing and they confirmed 55 PSI not 65 PSI.

[Alan_C]

It would be interesting to discuss Lund's recommendation of 55 psi with Ford Performance. They have their online chat which does not take too long to get an answer. For Lund to recommend a lower fuel pressure than does the Coyote controls pack instructions is puzzling.

[rich grsc]

It would be interesting to discuss Lund's recommendation of 55 psi with Ford Performance. They have their online chat which does not take too long to get an answer. For Lund to recommend a lower fuel pressure than does the Coyote controls pack instructions is puzzling.
It can be handled by the ECU. If you tell the ECU it's X/psi, it just controls the injectors accordingly.

[BradCraig]

It would be interesting to discuss Lund's recommendation of 55 psi with Ford Performance. They have their online chat which does not take too long to get an answer. For Lund to recommend a lower fuel pressure than does the Coyote controls pack instructions is puzzling.

Makes no sense at all, curious about their thinking. I'm running at 65 PSI as recommended by ford, Jon Jr at Lund never even asked about fuel pressure. Runs like a champ, why introduce variables.

[edwardb]

Makes no sense at all, curious about their thinking. I'm running at 65 PSI as recommended by ford, Jon Jr at Lund never even asked about fuel pressure. Runs like a champ, why introduce variables.

Exactly the same here.

[Alan_C]

I would have to believe that 65 psi is specified by Ford due to the addition of direct injection. Reducing pressure might create an issue with spray pattern from direct injectors. I think I would specify to Lund that the fuel pressure needs to be at 65 psi.

[Alan_C]

I am running a Gen 2 Coyote. The Aeromotive fuel pressure regulator install instructions identify a filter that can be installed in place of the vacuum hose barb. The Aeromotive part number is 15662 and they are available at Summit Racing among others. Here is a picture of the filter installed on my regulator.

https://i.imgur.com/f3cvChMl.jpg

[edwardb]

I would have to believe that 65 psi is specified by Ford due to the addition of direct injection. Reducing pressure might create an issue with spray pattern from direct injectors. I think I would specify to Lund that the fuel pressure needs to be at 65 psi.

I can't cite the reason why the Gen 3 recommended fuel inlet pressure is slightly higher than before. Direct injection may play into it somehow. But that's way to low for the actual direct injectors. The Gen 3 has a cam driven mechanical pump on the right hand head the provides the direct injection pressure. Pictures in this post: https://thefactoryfiveforum.com/newreply.php?do=newreply&p=315714. Don't know the specs of that particular one, but direct injection systems are running in the 1000's PSI. 1500, 2000, etc.


I am running a Gen 2 Coyote. The Aeromotive fuel pressure regulator install instructions identify a filter that can be installed in place of the vacuum hose barb. The Aeromotive part number is 15662 and they are available at Summit Racing among others. Here is a picture of the filter installed on my regulator.

Good catch. I've wondered about that but don't recall seeing it in their instructions. If it's there I missed it. Just placed a Summit order today. But too late. I'm sure it won't take me long to find I need another >$100 order (free shipping as everyone knows) and I'll throw that in. Thanks.

[JohnK]

Good catch. I've wondered about that but don't recall seeing it in their instructions. If it's there I missed it. Just placed a Summit order today. But too late. I'm sure it won't take me long to find I need another >$100 order (free shipping as everyone knows) and I'll throw that in. Thanks.

LOL - thanks to this thread it's also sitting in my cart at Summit, waiting for me to think of another $93 worth of stuff I need.

[Alan_C]

Just helping others spend their money because it is what we do.

[cfriedman67]

I emailed back and forth with Lund regarding 65 and 55 PSI and the answer was "Craig its not going to make a difference. Don't get hung up on it." Also, OEM is 58 PSI.

[Mike Garrett]

I emailed back and forth with Lund regarding 65 and 55 PSI and the answer was "Craig its not going to make a difference. Don't get hung up on it." Also, OEM is 58 PSI.

I had my gen 3 tuned by a Coyote expert on a chassis dyno. Ford told me 65 psi and my tuner said that was good. After some tuning it made 443 at the rear wheels. According to my tuner the gen 3 like more than 55 and 65 worked good. Just my two cents worth.

[BEAR-AvHistory]

Speed Hut GPS Speedometer & TKO - 600. Are there any transmission wire connections with this package? Have two wires with plugs that don't seem to have a home.

[JohnK]

Between the speedo and the transmission? No.

If you're referring to the wires/connector on the tail of the TKO600, that's for a neutral safety switch. Most don't use it and either tie it up out of the way or cut off the wires. The other available electrical connections on the TKO600 are the backup light terminals (half way back on the DS) and electronic speedometer output on the PS of the trans (not used with the GPS speedo).