General Supercharger Thread

11s with or without water/methanol? I'll take mid 11s at 75-full flow 500cc nozzle over just 10-11 "dry". Probably splitting hairs, though since it's probably all doing the same thing, but 0.0, the thing is a mule and just keeps working. I'm sure y'all are getting a similar look/feel. Just stating my experience and lack of concern now that the tune requires less gallons of water methanol/mile than previous tunes.

 

I have a log from a week ago that I briefly got while towing an old truck on my flat bed up a hill. Was only a couple minutes since I was just curious if the truck was pulling timing while in boost loaded down. Cruise control 75mph, 3000rpm (5th), no boost or AFR being logged, but high 10s for AFR, boost was 2-5psi consistently for minutes on end. ECT got up to 208F in the log, trans temps were also in the 205-208 range. Nothing really exciting from it, everything is just a flat line for 4 minutes but I can send it to you if you want. That's the only time I've datalogged towing, usually just have the OBD2 reader hooked up to the phone.

 

Does anyone know the limiting factor to the Harrop or Whipple for pulley size? I just installed a 70mm on a Magnuson and measured the snout size to see how far I could push it, and due to the OD of the snout I can really only drop the pulley to ~66mm in diameter which isn't much gain. I could MAYBE play some tricks or use titanium or steel but even then I could only push down to MAYBE 64mm. I wonder if the Harrop 65mm is the absolute limit that can go? And I wonder what the equivalent Whipple limit is. Just trying to theorize which blower has the maximum boost potential.

 

I just got my PE to settle out. Although its rpm based it will be at 10.8-11 at 2-4psi. 4-8 psi is about 10.6. 8-14psi settles around 10.4afr with 250cc water/methanol mix. W/M starts 100% spray at 8psi.

 

I’d measure it for you if I had the blower lol

 

No sir no meth just gas. Especially when I first threw on Downpipes. Had to increase power enrichment at wot. But no knock and she pulled real hard lol

 

For the Whipple, the backside of the pulley shows the hub mounting diameter. My calipers have grown legs so I'll grab a metric measurement later, but American Engineering units shows ~1 21/32" . I think that's ~42mm. I should add that it certainly isn't a press fit when changing the pulley but not necessarily wobbly.

The stock tundra pulley is 3.625" or ~92mm. For the altitude, I've pulleyed down two steps 3.375" or ~86mm.

 

All I see is a bucket full of sadness..

 

8-14psi God damn!

 

Right?!? He lost me after 4 psi and I thought he was rambling on about tire pressure or some such until I remembered @Mdl has BOOOOOOOST. I think he should just change his tagline to

MDL: 18 PSI and counting...

or MDL: how much boost does it take to get to the center of a tundra block...

or MDL: boosting for three...

or MDL: more boost than you...

or MDL: more boost than an entire atmosphere...

or MDL: boost opens windows to the soul block..

 

I personally feel "how much boost to the center of it" wins.. but I'm.old.

 

And I thought my measly 8-9 psi was a lot because it's screams.....but @Mdl is just on an other level! That thing has gotta scoot!

 

I know from experience and several holes punched through a block what a bad tune and too much psi can do. But I really don't want that experience again and rarely push it past 12.5psi. 18psi is reserved for @Fastlane47 !

I do have timing pulled a few degrees at 150 and 158% load. I just remember @snivilous saying how far can we "safely" push a stock motor with a good tune.

 

Haven’t measured anything personally on the Harrop but in this post @ViktorG said 60mm was probably the smallest you could go. I guess you would have to pair that with a larger crank pulley to get the most possible out of it. A 60mm with a stock 6.125” crank pulley would be about 16,100 rotor RPMs at 6,200 engine RPM. With a 7” crank pulley it would be 18,600 rotor RPM. This is within the TVS limits. If you’re trying to find which can move the most air overall, one consideration when comparing to the Whipple is you should not spin twin screws that fast as they are more limited on RPM due to having 2 different size and shape screws. I believe most say 18,000 rpm is the hard ceiling on a twin screw vs 24,000 on a TVS. The reason being is if the female rotor is spinning 18,000 on an 5/3 rotor combo, the male is spinning 30,000! Apparently if spun too fast they have issues with rotor phasing and the bearings will not last. For this reason as you can see in the photo from a discussion on a Camaro forum, even a TVS2300 can theoretically outflow a 2.9 screw for the simple fact that it can be spun 24,000 RPM vs 18,000. A 2650 I suppose would flow that much more.

 

With the A/C on it hits 20.5psi,

on cold mornings it will hold 19psi all the way through, but I know its way out side of it being efficient.

 

You and that @Fastlane47 character are nuts man! Lol

 

The engine is built for 25psi, I don't think I will ever max it out.

 

Even built it's hard for me to grasp that you pull 3 times the boost pressure that I run. My shit is a haha

 

So according to @Silver17 post, to max out the Whipple at 18k on a stock crank pulley, the blower pulley would need to be 54mm. On a 7” pulley, you’d be looking at a 61mm pulley. Just making that clear for @reywcms …

 

Harrop mounting flange diameter is 51mm, the snout is 52mm.

 

Same size as the Magnuson then. The Magnuson mounting flange is 51.8mm.

 

According to this, @ViktorG had a 60mm on his Harrop paired with a 8” crank pulley. Depending on your engine redline that should be able to max out the 2650 RPM. He said he was running 7,200 rpm shift on his built engine, so with a 60mm pulley that’s over 24,400 RPM on the blower. The ad is for a 62mm, but in that post he referenced a 60mm. Not sure if he used a 60mm or if he is just referring to the 62 as a 60.

https://www.tundras.com/threads/harrop-supercharger-62-mm-overdrive-anti-slip-griptec-pulley.138983/

 

Based on that and pulling up the Harrop CAD model I have, I think the Harrop measures pulley diameter at the top of the rib (this is how I measure the 1900 pulleys since it's easy to get the calipers on that), but the 2650 Magnuson's measure the pulley from the outside of the belt so a "larger" Magnuson is the same as a "smaller" Harrop. My 70mm pulley is really the equivalent of a 65mm Harrop since I use the same measuring convention for the 2650 as Magnuson does, and the 60mm Harrop would then match up with the 64-66mm Magnuson I'm thinking about.

So really, the Harrop and Magnuson have the same power potential (ignoring intercooler differences) and can fit the same size pulley.

Left number is the Harrop measurement, right number (radially) is how Magnuson measures it.

 

An interesting note for the sake of comparison just for fun. I was curious about the stock flow of a TRX supercharger as it comes. If quick research is accurate, the TRX has a 7.35” crank pulley and a 3.17” supercharger pulley on a 2.38 liter IHI twin screw supercharger with a 6,200 RPM redline. They claim 11psi of boost. That equates to 34,213 LPM at redline. To get that same airflow out of a 2650 on a tundra with a stock crank pulley at 6200 redline the closest pulley would be a 75mm which would flow 34,113 LPM at redline and also produce around 11psi. I think at that pulley size and boost level the tundra 5.7 would put out pretty comparable power despite being down half a liter of displacement. Now if only we had that 8 speed trans….

 

The Supersnake has 771hp and a 3.85" pulley on their 3.0 Whipple... I'm not certain the size if the crank but they shit and get alright...different apple, nevermind.

 

Those super snakes move out for sure. I next to one on the freeway the other day stuck in traffic hoping things would let up and the guy would lean in to it a little. I was in the sequoia so no chance at running with him but the kids in the back seat were hoping for a show from the truck.

I think the coyote also turns 7400 rpm so a smaller pulley would prolly spin that blower in to moon dust I dunno if the super snake ups the rev limiter but it would be a hoot to rip around in.

 

The Raptor R seemingly needs a lot more flow from the blower to make that 700hp. 5.2 liter V8 with a 7000rpm redline. 7.8” crank pulley, 3.25” blower pulley, 2650 supercharger at 12psi. That’s 44,520 LPM at redline. That’s 10k more than the TRX.

 

Here's what I got from CSP, is it similar to Interchillers?

 

I wanted to share an issue I'm having with my HP tuner scanner, I wanted to see if anyone else has had this happen and if you have fixed it. My scanner moves slow, it logs the data but has a delay. I can upload tunes at normal speed. I sent my dongle to HP, they tested it and said it works fine, just not for me. I'm using a new HP laptop, I also tried my old laptop and the same thing happens. I have also tried using the beta scanner and it's the same thing, most of the time the beta stops responding. Thanks in advance for any help or ideas.

 

Have you tried a different cable and/or different USB port on the computer? Do you have anything else hooked up via USB? Do you have anything else running in the background? Open up your Task Manager (Ctrl+Alt+Del, select Task Manager) and look at your available resources, CPU and Ram usage, and what the HP Tuner Scanner software is doing/using as far as CPU and Ram. I swear I once had a background process that ONLY ran whenever I opened up a specific program; it made it run slow as molasses as it the background process was using some 80% of CPU to rearrange my HD.