General Supercharger Thread

Having a similar issue with a 08 4Runner 4.7L where it’ll just cut out with too much throttle. I’m leaning toward fueling or the IAC. Will be driving with moderate pedal, and will cut out and jerk. I flashed back to factory tune, same issue, so I know it’s not a hiccup in the calibration.

Have you monitored fuel pressure?

 

The radio could be hard-wired like mine is...even with the OBD2 unplugged it still receives CAN data, I had to disable the feature on the head unit or I only got SAE channels as well.

 

@snivilous this is similar to what I was trying to explain. Not sure if you can look at my initial read file and first tune you wrote for me it disappeared. Only thing that comes to mind is fueling @texoma or some sort of torque management or ???

 

Did he also disable it in the head unit? Mine was unplugged and still causing the issues until I turned it off in the head unit itself.

 

Got the PML pan installed. Will have to finish up when I get back home later on.

 

Dang thats a beast!

 

How hard was it to get the bolts out?

 

It was easy. I've removed my pan quite a few times...no rust.

 

I used to get the occasional dead pedal, it has not happened in a long time. I chalked it up to a faulty Harrop wiring harness extension for the MAF or TB which I have since eliminated. Does the truck have stock gears. Just wonder if it’s at all related to this post by @mZiggy for example. There’s been a few of us with the dead pedal in the past but I think we all had Harrops so I thought it was just a harness. On a magnuson, could be something else entirely. https://www.tundras.com/threads/general-supercharger-thread.85513/page-144#post-2985631

 

What did you seal it with?

 

I debated between just using the cork or fipg. I wound up just using the cork.

 

I'm sure the cork is fine. I also have a pan to install. With the PML sitting lower, is anyone else concerned about the pickup being higher than how Toyota designed it? Ideally, it would be sitting close to the bottom of the pan. I think @Jowett has brought this up before. Could this have detrimental effects?

 

The check level is at the same height as stock so the filter pick up will be submerged. I was going to try to extend the pickup but didn't have anything to try. I did cut the pickup off my old filter and thought of trying seal attach it an extra inch down. And I thought I could wait for @Jowett to engineer something.

 

If there was no concern about the pick up grabbing air, then PML wouldn’t have placed baffles in there. Should we worry about it? Most of the time it’s likely just fine… but designing without considering the extremes, no matter how remote the chance of occurrence, is eventually asking for trouble. I say dry sump everything!

 

Not disagreeing with anything said. Tagging in Johnny @Cruisers & Co. in hopes he can help get direct answers from either PML or WAT. Given the location of the baffles and the pickup filter/screen , is there really that much to gain by lowering the pickup depth?

 

The PML and B&M pans have been in use for a while. Haven't heard of any issues.

 

I think it is fuel pressure! Still very preliminary, but the guy somehow got it to log today, said he hit repoll a dozen times and all of a sudden everything was reading.

This seems to be the moment it cuts out, accelerator pedal, TPS, timing, MAF, injectors, etc. all look normal but shortly after the rpms drop the AFR spikes full lean, and we can see he gives it some gas after and everything except AFR responds, and then a second attempt later and then AFR goes normal and rpm raises.



His truck is a FFV, not sure what difference that would make, but somewhere it appears to be losing fuel pressure. Gonna have him try to recreate it again and see if the same thing and logic repeats, and see if he can get a video of fuel pressure when it happens. If that all confirms it then onto troubleshooting root cause.

 

flashbacks of dropping the fuel tank a dozen times, anytime Fuel is mentioned in conjunction with a s/c issue

 

That's kinda what I experienced and tried to explain yesterday when we spoke. Is his ffv pump in high psi mode?

 

Was the fuel pump replaced when the SC installed? Hopefully the he injectors and seals were replaced.

 

I'm not sure what the current mode of the pump is, I think it's in high pressure mode but not sure.

He says the pump was replaced three years ago. The blower (and presumably the injectors) came off a customer (his customer at the shop he works at) vehicle and sat around before he got it, I don't know what level of refurbishment he did, but he did not change the pump since it already had a "newish" FFV pump in it.

And apparently it was not doing this prior to installing the blower, and he has it boost referenced currently.

 

Try it without being boost referenced. If he doesn't have it in high psi mode it won't give the extra psi.

 

Why would that provide less fuel though? It tries to increase pressure and there's nothing left, wouldn't that just be the same as already being at the max pressure and not trying to bump it?

 

It shouldn't...but. I'm just thinking of things to try before dropping a tank and pulling stuff.

 

Is he running in the 43 psi low pressure mode? With the switching valve relay closed it jumps it to 58 psi mode from what I remember.

 

Just asked the same question lol

 

I believe in the fuel assembly it caps at 43 psi and 58 or so psi at the rail regulator. The pressure switch valve activated removes the 43 psi restriction, thus allowing the 58psi to take over and limit.......now it's been a while but that how I was able to overcome my fuel issues.

 

Can't got also cut the bevel-restrictor off the rail to get to 60psi+?

 

I'm over 60 using an adjustible FPR & having removed all the Flex junk/jumping the relay per FiremanDan.

 

Didn't you say it was running close to 70? I wonder if that's why your IDC is so low? Because it's at a higher pressure, different injector constants would be needed. Below example of different injector voltages depending on base pressure...or maybe your tune was changed for that pressure?