General Supercharger Thread

Vociferous? Why, yes. Vehemently so…

So that’s something that does concern me - being hard on the rods - but I don’t know how justifiable my concerns are. Engines are more efficient at high load/low rpm. So if you are able sprinkle in some boost at lower rpm, you can increase the load without increasing rpm, which should net better efficiency.

BUT.. if you have to dip in to boost, I suppose you are putting more (excessive?) load on the rotating assembly. And you are putting more heat in to the cylinders. Since we are concerned with piston ring interference from heat buildup in the piston, we like to run the cylinder rich, but imagine PE hasn’t kicked in yet.

To counter the above, low rpm means less fuel per min is running through the cylinder, so the block and cooling system have more time to absorb and dissipate the heat compared to high rpm operation. So the excessive heat/no PE may be a moot point. Also, if the motor is loaded down with a comparatively steady rpm, timing and fueling should be theoretically easier for the ECM to monitor and adjust correctly. Perhaps this lessens the chance of detonation.

I’m reasoning with myself, not stating facts so please correct me if my assumptions are incorrect.

 

I might guess that there's some sort of bell curve where what your describing is ideal, but either side of that is of course less so. What you were saying got me to thinking about how fast coolant is circulating at a given RPM. Bell curve again, if the coolant is moving too slow, it wouldn't be removing the heat it has absorbed fast enough, and if it were circulating too fast, it wouldn't have enough time to absorb the heat it's there to remove. Finding the conditions where both are most effective is probably a never ending quest.

 

Or $9k for a semi

 

I do exactly the same thing as Dave. As long as it's richened out in boost, I usually just let it chew. If it's making 5+ psi or so for an extended period I usually downshift just since I get worried about sitting in boost for that long. I've also seen coolant temps start to climb if it's in boost, even a low amount, for a long duration. I'm not sure what's more stressful, revved out or boost--if it's the same horsepower at the end of the day. Personally that line of stress I'm willing to accept for minutes on end is that 4-5psi mark, then I feel revved out is better.

 

as a favor to those that are simpatico with you, can you explain, what you did to change your tune?

I am in the exact situation & would like to be able to tell my tuner what needs to change.

is it as simple as moving the PE engagement down a few % points?

 

Someone like @snivilous would be better at explaining what is needed. Essentially my PE engage has been adjusted to 25 degrees of throttle angle and disengage at 20 degrees. This equates to engaging at 36% TPS and disengaging at 32% TPS. To keep it from going full rich in those scenarios, Dan tweaked the fuel cells in the tune in the 1600-2400rpm for PE. I’d have to compare the files to say 100% what was changed, but Sniv adjusts these things on a regular basis. He also prefers to let it go full rich rather than trying to feather a mid-range AFR as I did if I understood him correctly in prior posts. This was briefly touched on in the most recent posts of the “how to tune with HPtuners” thread if you want to check that out.

 

@Mdl would you please tell them the solution to keeping cylinders cool while in boost, regardless of RPM?

 

Momma always says not to have a dependence on meth. That, and alligators are ornery cause they got all them teeth but no toothbrush.

 

Mama, mama ,Mama says... Great movie!

 

Do it and don't look back!

 

That's just plain cool!

 

Firemandan's fueling setup got me thinking about the cooling sauce...water/methanol. And I'm mainly at a 30% w/m mix just for a little bit of extra cooling.
I'm at 24 enable 22 disable and may lower it a lite bit as I'm at 4-6 psi pretty early with @snivilous 2.0 pulley.

 

After 3 long years on jackstands I finally have my garage back. And the Tundra just barely fits! I did some sketchiness to get the car on the trailer but I didn't die. Threw in a new set of seats so I could at least feel like there was one upgrade done. Passed emissions for the last time on this car. Never has to go again! Then grabbed a quick beer at a brewery with my buddy and his newly whippled rock warrior. Overall it was a good weekend.

 

Anyone ever consider just water injection? I think BMW used it on at least one of their engines. It provides cooling without adding fuel or worrying about rotor coatings.

 

Lots do it. Just do not spray at high concentration at low rpm's as it can bog the engine down. I'm really not worried about rotor coating or pitting. Usually those that try to go 100% methanol. That will eat aluminum in a heartbeat.

 

You’re probably fine at your %. At this point I’m just too lazy to have to alter the tune for the increase in fueling from the meth lol.

 

You’re gonna have to run you and your buddy’s RW now…. For science.

 

Ya that will definitely happen. We both punched it the other day when i was behind him. I was right on his bumper through first and second but it seemed like he ever so slightly was starting to pull away in 3rd gear. It's almost time for me to throw in the injectors I bought from @Fastlane47 and a smaller pulley and see what i can do. I'm still on the stock maggy.

 

I had a little fun with a trx the other day. I didn't think he would bite but he did. I wish i could have gotten an actual run in with him but there was too much traffic.

https://youtu.be/VupqXf3N1G4?si=4c5cjITSIc6ib-pd
https://youtu.be/kEs4-veqFVU?si=WHtFOaiNeyJ_gMSN

 

Bet he was surprized!

 

Ya he was smiling and gave me a big thumbs up when I was getting off the highway. I jumped on him not thinking he would floor it but now it has me wondering if he would have pulled me back in or not. This is the second TRX I've messed with and still have not been able to get an actual run in with one. Only @reywcms seems to know what it's like to walk a Rex.

 

I love making the Az racer bois cry.

lol

Did it a few times in the BMW last week too!

 

That little car must be fun.

 

Haha I was wondering if there was a car in front of him, or of he realized when he stomped it that he wasn’t gonna reel you in, and that it was too embarrassing to stay in it any longer and opted to just act as if he wasn’t trying.

 

Unfortunately, there was cars in front of us both. Total bummer we couldn't have a little more fun. But ya I think he knew either way it wasn't gonna be like he walks away from me

 

It is 2800lbs & has at least 350hp, traction is the main issue, I am learning it so I don't pull a cars & coffee exit.

 

Please I don't want to see a mustang post in here!

 

Not saying the TRXs are not quicker in most cases, but it’s definitely not enough of a difference to care about it sure seems to me. They’re definitely closely enough matched.

 

Dead stop drag race the Tundra is outmatched hands down. Launch control, better trans, etc. But on the highway I think the Tundra being lighter makes it about even.