General Supercharger Thread

Hate to ask stupid questions, I did search, but for those of you who use the scangauge 3 is there anyway to monitor Knock? I understand not displaying Boost, plan on a separate gauge. Currently have afr, timing, calculated load, LTFT, STFT, iat, coolant temp and MAF....... BTW just picked up the truck, as of now driving her like a grandma to get some miles in

 

Mean and Clean!!

 

It'd be under knock retard if it's similar to HPT.

 

Yeah just not seeing it as a choice for monitoring.... it has x gauge and allows me to input a number but have no idea what they may be

 

https://www.fjcruiserforums.com/threads/toyota-specific-pids.739248/

That thread lists some PIDs for KFB and KCLV but they say they're not sure if they translate to other vehicles. Post #6

 

ask scanguage on their site

if they give you a code. Share it

They are on this site, but I forgot his namr

 

Thank you guys ill continue digging.

 

The Scan Gauge rep's handle on here is @ScanGauge AKA James DeLong

 

https://www.tundras.com/threads/scangauge-3-available.107529/page-2#post-2798831
I didn't see anything knock or retard related in the auto scan options. They may have added more in an update so the list may not be complete. They do have ignition timing.

Doubt it is the X Gauge section, that is a monitor I would have added when I ran the SG2s

 

Here my setup for now on monitoring.

 

What’s the intake diameter at the MAF?

 

that’s the normal Maggy box I believe 3.85?

 

I was curious if it changed in the 2650 kit or was the same as the 1900.

 

I bet it’s the same

 

Need some help or insight. I changed my trd intake to 4.5 inches, installed Prospeed adapter with RCF TB, 750cc Denso injectors and Snivs 2.2 pulley. I removed snout by taking water crossover off and idler pulley and coolant lines. Tuned for increase intake and 750cc injectors. On startup I had a fuel leak at the return AN fitting from passenger side return. Stopped engine and tightened fitting and cleaned up fuel spray. Started up and RPM's were in the 2000's then decreased down to 1200 with afr's going from 14.7 to 17.88 multiple random misfires. Idle was akin to a overcammed GM hunting for a good idle. STFT were +4 to +19%. Misfire on 12578. Pulled injectors and reset started and got misifre on 3 and 6. Increased intake to 40% over and same thing random misfires. Removed 750 Injectors and replaced with 535's only had tune for increase intake same thing misfire and high afr's. I noticed I was bottomed out with the TB screws for PS adapter. Installed washers and TB was sealed. I disconnected battery for awhile and looked over vacuum lines PCV system. Started and afr's were still high with high STFT 20%

Tried a Prospeed intake tube, thanks @snivilous, and same thing.
Removed 4.5 intake and installed 4 inch tube with maf installed and normal tune. High 2000 rpms settling into 1200 and 900 STFT were -3 to -20% although afr's were in the 10-14 but high as 16 all over the place. It ran great before but I was maxxed out on injectors. Im scratching my head as I cant figure this one out...Any insights????

 

Seems like a vacuum leak to me, maybe the injector isolators have dirt under them not allowing them to seal?

 

Sounds like a vacuum leak... have you tried unplugging MAF and seeing what happens?

 

@armyoffoo, I cleaned them up and also sprayed maf cleaner around to see if any leaks. Ill recheck again as something could have slipped. I vacuumed and wiped area but who knows...Thanks!

 

@HulkSmurf14 unplugging maf and it just dies.

 

Did you let it idle long enough to start getting LTFTs? Then adjust IC to bring the LTFTs to ~14.7. I've only tuned my own truck, but I've never really found a use for STFTs in doing so. Have you also considered swapping back to the stock TB? You were running that when it was running correctly right, or the RC TB and only changed the intake, injectors, and pulley?

 

It was running rough and after a few minutes would be at 17.88afr and rpm bouncing from 1500 to 800. I put original TB on and 4 inch intake and 535's back on. Same swinging afrs and stft.

 

Your STFT will always be adjusting from -25/25, that's what gives you your LTFT's. +/-10 is what I always targeted for LTFT at least turbo wise. You said you are -10/-20 back to 4 inch stock TB, 535 injectors? What STFT #'s are you above 2000 rpm? It's odd your running rich at idle

 

I thought STFTs once they stay for an extended time convert to LTFTs, so you have to consider both. For this where the datalog is only a couple minutes, there's not enough time for the fuel trims to move from short to long, but it shouldn't matter since the net fuel trims is calculated as short + long anyways. If it's +20 short and 0 long right off the bat, one could assume it'd eventually go to +0 short +20 long so either way the net fuel trim is +20.

 

The STFT will always bounce around depending on mass airflow/fuel/ throttle/rpm/load/weather etc. The closer to zero the better of course. Then the LTFT will set depending on STFT data especially after a tune and getting some miles in. After I would tune my Speed3 STFT would be everywhere, within -25/+25 and would gradually adjust my LTFT until I was close to 0 give or take. If LTFT eventually was below/above -10/10 I would adjust my map to get close to zeros

 

The odd part is if he's at an afr of 17-18 and pulling fuel in stft's. That seems like an adjustment to the MAF voltage is needed imo or a vacuum leak...

 

We've tried adjusting the MAF parameters all over. If you keep bumping the MAF to try and get it to add more fuel it just doesn't seem to change anything. When MDL went to the 4in intake it seemed to help the AFRs, but then it's just hunting back and forth aggressively as well as the MAF voltage became extremely jagged for some reason.



And correct me if I'm wrong @Mdl but this is after he reset it to the original configuration more or less, small intake, stock TB, original 535cc injectors. Original deviations from that did all kinds of weird shit and misfiring all over, now he's back close to the original setup (really with the exception of the 2.2" pulley) and while it runs the data just looks insane. I'm not sure where he should chase down an issue at next. It was weird that the fuel regulator sprung a leak after installing all this stuff, but after he fixed it it's reading correctly and behaving as expected. Could the regulator be reading pressure but not able to deliver enough fuel? MAF randomly shit itself when installing everything? Air leak somewhere, maybe the snout since he removed that but that seems unlikely also. Could bump the pulley size back near stock or remove it altogether but that also seems unlikely to be an issue since we're just talking about idle right now unless the belt is just slipping like a fiend but the MAF should pick up on that anyways so it should at least run somewhat normally.

 

That erratic MAF voltage kinda bugs me. Have another close look at the MAF wiring and pins at the connector? Swap the MAF? Air leak where the MAF seals to the intake. Kinda grasping at straws.

 

I tried plugging the purge solenoid. Cleaned pcv and started high 2000rpms settled to 1200. Afr were 12-15 with hunting rpm, didnt have fuel trims yet. Gave throttle to 2500 and afr 14-16. One thing with system back to normal (535 and 4 intake) is no lid just 4inch tube with maf inside and filter held against it as I modified the lid for 4.5 intake.
I'll check injector isolators but to hVe both banks affected is wierd.

 

I got an answer from scanguage on knock

I’ll post in morning

 

Just got the truck back

pulley, belt , etc


I easily hit 8.7psi. Never done that before