General Supercharger Thread

just as an FYI for anyone interested.

I've mostly just been talking to @snivilous about this, but also @ARES35 a little.

I'm at 166k miles with 3k on my mag2650.
stock canned tune from mag

I ordered and installed sniv's 76 pulley. runs great...hard!
did boost ref to add more up top wot fueling
afr seem to stay rich until you get to 5500 rpms or so
injector dc is maxed around there... so it's getting enough fuel but starting to run out... and this is while pushing the 535's to the max dc

i just ordered dw650's
will install and retune and see where i end up

 

You'll like the added safety of not touching the ceiling with the 650's. I couldn't believe when @snivilous was saying I'm running at 100% duty cycle with the 535's on the smaller tvs1900. I went with denso 750's' currently at 73% dc, and a whole fuel system mod with larger intake etc.
As others who run the 650's it is reliable with the stock fuel system. Enjoy and good choice!

 

@snivilous is hands down your best bet! I'll most likely regurgitate what he's taught me with a few exceptions on FFV stuff I picked up from @firemandans threads and @SlowNStock from the repository. 650s are a good choice for your application! . I would also highly suggest switching over to a MPVI-3 so you can get the best bang out of your mods imo

 

When you say " stock fuel system", do mean retaining the factory fuel pump?

 

i can’t speak for MDL, but usually that just means stock lines, rails, and usually FPR. The pump and injectors need to be replaced and comes with the SC kit.

 

Question for the group: heard back from Mat at VF that he did not identify any tables we weren't hitting. Suspected that although we could change the injector cranking pulse that it wasn't actually doing anything since adjusting the values up or down didn't seem to create any differences in my hard warm start issues.

I'm wanting to throw this 77.5mm pulley on I've had for 5 months. Been living with the hard warm start issue and it sucks. If you were me would you-

a) put on the smaller pulley/tune and go from there to address injectors
b) make sure to get injectors that start correctly before proceeding
c) put in new injectors and the pulley at the same time

What would be my best bet for other injectors to try? Denso 650 750, DW 650 or 750, others?

Currently I have the DW340 lph or whatever Harrop kit supplies with a Walbro 450 in the trunk as a spare.

.650cc x 60mins x 8cylinders =312lph which is like 92%. The 750's are 360lph . I don't know squat about tuning so wanted to see if anyone has had experience being too close to the max DC of the supplied Harrop pump when they upgraded the pulleys. TIA

 

That factory fuel pump is replaced with a higher flowing pump with the 2650 SC kit, non ffv. But if he pushes it higher than he can upgrade to a dw340 lph unit.

 

I would address the injector situation first. I'd go with either dw650's or prospeed. While the prospeeds need some adjustments they work. Denso 750's can have a warm prolonged start. It's not bad but does happen.
If you go walbro 450 get the 267 model as it drops in without modification. You will need a modified fuel pickup sock filter that I got from quantum fuel. But I'd stick with the dw340.

 

Thankyou.

I've read thru the install a dozen times and changing FP was always required. I just wasn't sure you guys hadn't figured out a way to use the factory pump.

Thanks again.

 

Yeah I’m looking forward to knowing I’ll have extra overhead and when I get a tune, as sniv said, they may add more fueling anyway that my current injectors cannot provide. So it seems needed regardless. Though drivable and safe now, it’s the right best next step to ensure long term reliability.

 

Anyone know what size is in the 2650 kit?

 

For those upset over getting the belt on a Tundra.

Been wrestling it for 2 days.

 

Yeah the s54 blows too lol
Edit. That might be s52?

 

I believe it is 325lph. Others may know 100%

https://www.tundras.com/threads/com...s-injectors-rails-etc-etc.81884/#post-2688354

 

This is an S52 with S54 oil filter housing & oil cooler/hoses that are in the way. my arms are a mess, look like a cross between poison ivy & chickenpocks.

Modding is such fun!!!!

 

Ahh gotcha. Looks like a fun project.
Is that an AA sc?

 

Folks,

I have a hypothesis for a problem I've been chasing for months, and I'm wondering if this brain trust can help me validate its plausibly.

Bit of background:
- 2019 SR5,
- Maggy tvs1900 'kit'
- upgrades to fuel system: walbro 450, a check value, prospeed rails, larger lines, afr, fic injectors.

I've been chasing a phantom issue where the tune logs indicate random instances of going rich/lean. I have exhausted my search of this being a mechanical/install issue, and have had the truck install audited to verify that.

Early on in the troubleshooting process, I removed the lid of the blower to re-seal it (the idea was this could be a source of an air leak). During this process I noticed a pool of motor oil inside the blower, under the intercooler. Thought it was strange, but that was the extent of it.

Now, I. Wondering if I have blow by ... And, a lot of it. To the extent that it's fouling the 02s and that's that's messing up the fueling.

Thoughts? Remedies? Process to test/measure?

 

Do you have a pcv catch can installed?

 

Nope

 

Yup

 

I’d also suggest going this route first. I’m surprised by what gets caught in mine.

 

Where is the afr data coming from in your logs?

 

You’d be surprised how much cleaner the throttle body stays without the crankcase venting to the intake.

 

I'm not sure I understand your question, everything is being pulled off of the O2 sensors.

 

The oem oxygen sensors max out at something like 11:1, and can not read rich enough to accurately measure afr while under boost. Can you post a screenshot(s) of the logs where it's doing the random rich/lean so we can see what you're seeing?

 

This. Same info I was told. Need to use wideband to see afr accurately since these motors need to run rich. Can’t rely on o2 for any data logging

 

You could do a compression or leak down test but I think you would be getting misfires if it was major. Where is the check valve and do you need it? I only have the check valve on the walbro 450. How is your fuel line from pump to canister? Good seal? Possible random losing/gaining pressure. How is your fuel psi? I know we asked a bunch of questions before.

 

I also have a wideband installed, but - still not following how the 02 sensor can't cut it? I'm able to see the same afr from the wideband as I can calc.from lambdha from the logs.

 

This is what I was thinking too, plus pulling the 02s, to look at the condition

 

With the compression ring lands being tight we target an afr from 10.1 to 10.5, while in boost, for cooling and adds a safety margin if you start leaning out at WOT. The stock O2's can't read that low.