General Supercharger Thread

At Xact, waiting for my appointment.

 

We ran water meth on the old mans built sti. Awesome system but correct on if it runs out and you're on it you could be sol.

 

RE: IAT is there an air density table referenced? IAT temp may be a rolled up into a similar calculation.

 

"Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve driveability"

Looks like there are some DTCs related to IAT temp/MAF, not sure how accurate the site is or if it applies to this Gen Tundra.:
https://www.ttundra.com/825/intake_air_temperature_sensor_1_circuit_range_performance_p0111_.html

 

Waiting to hear the results!

 

I have a fuel cut out. Need to figure out why.



This 700 hp supra was there

 

Did you get larger injectors?

 

Yes5-0 650s he said are delivering 750

 

I'm guessing the injector duty cycle was not a cause?
What RPM did it cut at?
Do you have a fuel pressure gauge in your regulator?
If so, did anyone monitor it during the pull?

 

I would guess the injectors aren’t mapped right

 

Oem FPR, no gauge, he said I need to figure out a way to get fuel pressure. He said there is a ton of injector % left, that the issue is although he commanded it to get a shit ton of gas, it was cutting at wot. Snevilous said that from logs I sent him.

He is a 30-year pro, I am sure if he could have he would have done it, he charged me 300 less than if he had done the full tune.

 

I stand to learn something from this

keep the info flowing

 

Not really a rpm cut, it just randomly starts losing fuel. This is a datalog from yesterday and very clear, you can see the truck commands it to richen (orange) and for a few second it does (red) and then there's blips where it loses fuel and even goes lean.



Injectors according to the datalog are fine, the truck runs fine otherwise, the injectors constants double checking them appear fine. COTS is turned off so the only thing that should be controlling fueling is PE, and going back to the graphs, the injectors and fuel system are fine for a moment and then something happens and they hiccup and then grab fuel again and hiccup. Other datalogs are even worse where it'll maintain fuel for two seconds and then just completely run away and lean out insanely bad.

New Walbro 450. My theory is either the fuel pump connections got loose or screwed up and bleeding pressure off inside the tank, or there's some weird flex fuel thing going on where the pump is seeing reduced performance. All the flex fuel parameters in the tune are matched to the normal operation values, and OP said the dyno guy looked at ethanol content and it was only at 6%.

Any suggestions for e30, assuming the issue is not on the tuning side

 

TBH, that sounds suspiciously close to what was happening with me when the fuel line blew inside the tank. Truck still had pressure, but not enough. I did get a lot of errors on the dash, but I believe the 2021 is gonna have a different dash layout than the 2010, so we wouldn't see the same dash lights. You were reporting some, though right? Were any of the codes lean outs? @e30cabrio

I also had that vacuum leak causing the readings to jump back and forth

 

The only code I have gotten lately was fuel sender signal P0462, the truck is a 2013, but I have a 18+ cluster.

Due to M3's issues I used the plastic "hose" that came with the walbro & the similar one that was in the oem basket, I used fuel line clamps, the kind with a screw that goes through both sides of the clamp & constricts. On the main "nipple" which was very big and a major pita to get the hose on, I sinched it enough so it would not move, the hose was not moving without it. On the smaller return the hose was loose without the clamp, I sinched it until there was no movement, I also have the Radium Venturi, also using the plastic hose & fuel line clamps.

 

Didn’t realize you have an FFV. Did you remove the VSV relay to keep the pump in high flow mode?

 

It’s been out for over a year since Viktor tuned it with e85 out.

thanks

also I have a non flex basket and the valve is bypassed (if that matters)

 

Apparently I have a cognitive disability. The tuner read the thread (these posts) and said this:


you've got some stuff backwards. there's no cut, it's me letting off the throttle because it's so lean, i don't want to hurt the engine.
there's almost nothing left of the injectors, they're at 80% duty cycle at only 4900 rpm.
everything is working like it's supposed to, we just don't have any delivered fuel. that's why it's so important to start with pressure.

 

Hmmm

 

I'd definitely start working back to the pump to double check. May try going boost referenced if you're not already. Disconnect fpr from intake, and reroute it to the boost port, and cap the intake side

 

What if I get something like this to use my FPR?

https://www.ebay.com/itm/3722760809...Om-E2ju2C9J50tFBAvmEgL76X2mxFvxBoCFBkQAvD_BwE

 

He just sent me this:

here's datalog from last pull. you can see injector duty cycle is 85% at just 5100 (750cc @ 58psi injectors!). maf is at 4.5v, commanded fuel is .7 lambda (very rich), but can see actual lambda is .95 (very lean), which is what the dyno wideband was also showing. there is no g/s limiter that i see and there's nothing that looks like it's not doing what it should. just have no fuel. that's nearly always a pressure problem.

 

I think so. In one of the ViktorG vids he talks about connecting an fpr to factory fuel lines. But he's also running custom fuel lines.

 

Here is the before/after on the good news side.

 

Pops is waiting for the custom pillar pod setup to come in but he threw in a boost gauge. Here’s a quick vid


https://youtube.com/shorts/tBNdbNHyLQ8?feature=share

 

Your Ethanol percentage is saying 27%, is that correct?

 

It has never had any ethanol in my ownership (4/21) The VSV relay has been out for over a year.

 

Sure, but for some reason, it appears to think it does. Honestly, I don't even know if that relevant.

I was looking at one of my early logs with the 750s just to compare my INJ DC vs. Air g/s at similar revs. I know we're at different elevations, but mine shows over 430g/s at 6100rpms and "only" a 64% INJ DC. If memory serves the wideband back then was indicating in the low 10s. If I had your numbers, I would think mine would be running super fat, +80% INJ DC with 750s, sounds like a lot.

 

Prospeed intake and RCF tb on the way for pops rig. Will use the the prospeed for now just to get the maf sorted then have the shop build the custom box.

 

I don't see any adaptors for the fuel into the FPR, does anyone know where I can get one? Or is there an aftermarket FPR that will connect to it?