General Supercharger Thread

wish everything was less expensive, but you gotta pay to play.

 

Awesome! Hope that is the end of the issues.

 

Are you still going forward w/selling it though???

 

Yessir. Got it listed and will sell if someone comes forward with the money. I think a superduty would still be the smart move, long term. We will see. I'm in no rush, especially with how perfectly it's driving with all stock TCU tables.

 

I saw that on FB and was going to comment and decided to not waste my time. I don't know where these kids get their kool-aid from lol.

 

They’re good kids living their best life trying to make an 07 Tundra go fast. We all learn.

 

The BCA kit uses Koyo and SKF bearings and you can order the front bearings/seals from Japan.
https://www.summitracing.com/parts/ntn-nbdrk382mk

 

I saw those kits when I was shopping initially. Had I known what brand bearings were in them I would have ordered. Super good price! Its crazy how cheap you can put together a complete gearset and install kit with some of the deals we saw compared to if you order the whole package from somewhere.

 

Damn, that's solid. Might scoop that up for the 'one day' install potentially this spring.

 

Do it. Then add it to your for sale ad "fresh bearings in the bed"

 

Don't tempt me.

 

he might need the money to fix the ford when he gets it

 

I'm sure they are. I'm not mocking them. Just thought was funny because he thinks he's going to be running 10's when all of us in here know that's not going to happen. Either way you know if he does supercharge it he is going to be smiling like the rest of us!

 

let the kids be kids. i once thought this was fast (mine was blue).

https://youtu.be/fRLG0NgTfRo?feature=shared

 

yea yea, classic funnyguy

 

You can get better than 10's dropped from a great height, ONCE!

 

hes claiming when hes ready to get the SC hes going to build the motor.
what i found funny is he was saying his trans is bulletproof because he had it tuned

 

Where's this conversation happening?

 

this group on a post of a kid who just put long tubes on

 

I found this local place, they have good reviews, Should I have my converter rebuilt? (145-185)

https://www.google.com/search?q=roa...gBEAEYFJIHBDQuMjSgB-XfAw&sclient=gws-wiz-serp

 

This is great to hear.

I have been watching my pending codes and occasionally was seeing the P2757 pop up as pending (same wheel size, IPT Trans, gearing). So I disabled the flex lock by seting all the RPMs to 6375.

Drove around some more watching the pending and it wasn't until 1.5 hours into doing errands (and almost home ironically) had the P2757 come pending again. It happened around 45mph going up a slight incline. It looked like I was 1100rpm, which I believe is 6th gear. It had kind of a minor rumble strip feeling. When this happens I look at the AFR gauge and it shows near 0 PSI vs. usually cruising would be negative pressure. So it seems like these superchargers + larger tires + rebuilt trans has some funky Torque converter lockup stuff happening near low rpm in 6th gear. Possibly low line pressure related due to rebuilding the valve body? It is also about 32F here and my trans cooler is pinned so maybe low trans temp related.

What I am mostly confused about is my shift schedule for 6-5 is 1700, so I am not sure how I am in 6th at 1100 all the time. Unless the "1700" is not the engine speed but the output shaft speed = 0.588*1700 = ~999 rpm. Since the TCC lockup is released at "1701" and the down shift is "1700" wonder if the engine is somewhat lugging or something at that speed (like on an incline). Thus my hypothesis is that I should either drive in S5 more often or set the shift points higher to stay out of 6th or some other combination that shifts preemptively.

Similar to your observations, truck drives completely normal outside of these (pending) P2757 occurrences. I did not get this code before rebuilding the transmission either (totally different symptoms/codes after alot of wear and tear).

 

Try and recreate that in S6, and then pull back to S5 and see if it downshifts or if it doesn't change anything so you know you were already in 5th.

 

Going to try that for sure. As well as s5 driving same routes to compare.

Another thought I had is my larger headers/exhaust may actually be part of the issue at these low rpms too (when under load up an incline), when combined with tire size making the overall gear ratio very low with limited exhaust scavenging (dual 3” dumped). Then the truck is trying to lock up in those conditions.

 

It is output shaft rpm and will need to be calculated. Can you try to have it downshift if it is lugging as it probably doesn't have the line pressure to hold it. Especially if your getting a shudder.

 

These trucks, especially with the supercharger, seem to hate high load/low rpm.

 

There are NA Tundras having p2757 codes. Some with shudder some without. Some have the code go away disabling flex lock some changing tcc lockup rpm or torque converter. Usually the slu solenoid is good.

 

Mine doesnt seem to mind chugging along in 6th at 1300 rpm going 55 on backroads up hills and all. It’s also possible it hates me for it and just hasn’t told me yet.

 

Yeah I considered that, at @Mdl suggestion. I just didn't want to change what I know 'should' work properly. I went from the stock config and modified to something that works for others, ie- changing lockup. I never loved the way it drove, albeit it was only a week or so (maybe two) with the lockup's modified. Seemed like I couldn't get it to behave properly with the tire size, stock 4.3, and fixed lock up. Runs perfect now that the lock up has been changed back to stock. My wife drove the truck today about 50 miles and even said it feels better.

All in all, feeling much better about everything now. MPG is back up from what I can tell - no longer at 11mpg, looks back up to 14.5mpg. Not going to make or break the bank by any means, but another signal for my brain that everything is as it should be.

P2757 is an oddball code, but it does tie to specific faults - 70rpm or more diff between 'input shaft actual' and 'output shaft expected' when locked or sub 35rpm diff when unlocked. Aside from an electrical issue, low ohm/resistance on the SLU solenoid, or complete trans failure elsewhere, the code will be thrown when the RPM tolerances aren't within spec.

Edit - adding that I have never had any shudder whatsoever in any rpm or mph under any circumstances. code has always been thrown in a high load, low to high rpm situation.

 

I have mine setup just little differently than stock. Have tow/haul setup for 4th lockup for towing but similar to AI/cruise lockup schedule. Those with hpt can disable flex to see if that is the culprit for testing.

 

I also wonder if flex vs lockup rpm behaves differently. I've never touched the flex tables and only adjust the lockup engage/disengage rpm. I would think it'd be different paths to the same solution, but maybe not.