Turbo BS Thread

That spool is a bit conservative but is more like what I see on my auto. The torque converter robs a lot until about 2000-2500

You can scale vertically the plot line to compensate for faster spool, but it realistically is probably still not anywhere near the surge line, which is where you want to be for max spool, and where manufacturers design around from personal testing

 

I feel like I had more spool when it was auto. Atleast in 1st and 2nd. I have a R151 in it now which has really low gears in 1st and 2nd. Spool definitely got better in 1st with the .82 vs 1.03 housing with 35r.

 

Weird. If you think of it in terms of load, TC is less load vs direct drive with a clutch.
But ya smaller housings are a must. I ran an eBay GT35 and it was massively oversized for my application. I now run 2x K03s which are used on 2.0L engines. So basically I'm running a 1.7L engine on each one, which makes them slightly oversized, but gives me that margin that the manufacturers take most of in tuning

 

Only thing I can think of is the Stator helps out and gear ratios. Obviously it would be nice to test all this stuff back to back. But no one will do multiple turbo/housing tests, then do them all again with a different transmission, on a 20 year old truck.

Yours is a cool setup, very different, in a good way. Any hp guesses or dyno sheets?

 

I should be around 350 right now

 

That's probably around 400ft/lbs. Zesty

 

I've posted this before when it was fresh, but somewhat relevant now. This was on a "heart breaker" Mustang dyno, 35 inch tires, 4.56 gears.
Solid plot was NA, Auto and K&N intake. Hard to dyno an Auto because it always wants to drop a gear, so getting lower rpm data is hard, so on these rigs it's typically from 3000rpm and beyond.
Thin line is same 35" tire, 4.56 gear, but 5 speed, dynoed in 4th gear. Genuine 3582r, 1.06 housing, no boost controller and 8 psi.

It made 315 ft/lbs to the wheels. I changed springs up to 10 psi and it went to 355 ft/lbs. It was a little rich and we ran out of time. Unfortunately I don't have that plot to show.

This next pic is a few Torque curves combined, quickly, by hand on paper.
Stock Tq line is taken from Magnuson SC graph. Supercharger Tq is also from that graph. Turbo Tq is my old graph with Aem fic, 1.03 housing and no boost controller. New Turbo Tq is Estimated, but is using .82 housing, Haltech, boost controller, and more heat management. Take with a grain of salt.

 

What fuel?

 

@lavrishevo 91 octane.

 

Little Tuesday morning motivation

 

Less load but higher RPM by quite a bit, it's a gradient of the two that gets you spool. If I just stab my pedal in 5th (OD) gear on the hwy at 70mph itll make 4ish lbs but won't really want to do more quickly. But I'd bet when you do that in 4th (OD) it unlocks the TC and drops a gear (maybe 2) and you probably spool right up despite the load being lower in that lower gear.

 

Have access to e85?

 

Ya, fair points. Velocity/heat/mass relationship
For me cruise is around 1800 and it seems like from a dead stop it takes to about 2500 to really overtake the TC (idk where exactly the lockup is), but as long as I get over that hump it builds extremely quickly

 

You cruise at 1800 on the hwy? What's your diff gearing again? Lockup occurs whenever the stock ECU sees that load is low enough, so I'm sure it's not helpful at all right now being fed questionable info haha

 

Not the hwy, just like going 55 down the road (technically a highway haha). But I'm 4.10 on 35s

 

Oh. 4.10 on 35s with an auto... that's a considerable load for that TC to take on. I don't have a great frame of reference for how that would feel

 

Feels good once you're going haha
Digs suck.

 

Yes but don't care to play with it.

 

We have it here too, can make excellent power on it but unless you're willing to plumb and wire a flex sensor in and then retune entirely for pure E85 it isn't worth the effort for just a couple fun pulls. Plus E85 here is more expensive than regular 92. Good for a hail mary pass on the dyno or the drag strip though.

 

My thoughts exactly.