2.4 ecotec turbo
 

2.4L SUV engine (LE5)
K04 turbo with bullet compressor wheel
FlowForce 960 injectors
On wastegate only here

First run is in red, blue is after some tuning
Tons of room to build power with boost higher up, but I'm happy with the torque, and it feels awesome to drive

That is a little torque monster youve got there. How much boost is wastegate on those engines? How much flow is the K04 good for? 300ish whp?

The peak torque there is 12psi. I'd like to see a bit more flow in the wastegate to take the edge off that spike, but I'm sure I'll be well over 12psi soon enough. After the spike, it drops quickly to 9psi, then down to 8psi from 5000 to redline (7000).

My next step is to get EBC dialed in and get it dialed in at 11-12 psi all the way up.

According to the literature, with the bullet compressor wheel, this turbo should be good for 400hp. The engine and drivetrain should support 350, but we'll see how far I get in that direction.

Based on experience tuning LNF's from my Cobalt SS days, the Twinscroll K04 offered on the 2.0L would make ~300whp and ~350wtq on 21-22psi on 93 octane with nothing more than just a tune. It was enough to push my otherwise stock cobalt to a 13.4 @ 111 1/4 mile time with a horrible 60' time vs 14.0 @ 102 from factory spec. More daring guys were edging as high as 330whp / 380 wtq on 24-25psi and E47 fuel, but you really are pushing the turbo hard to get there from a long term reliability standpoint. You may end up making a bit less due to some extra drivetrain losses in RWD layout, but should still be close once you get it dialed in. Those numbers were also ramping in boost pretty hard, which isn't necessarily preferred for road course application.

The long story short of it, a 2.4 Le5 k04 powerplant would be a blast in a Miata. Torque for days. Numbers look good given the circumstances. Anxious to see how to dyno charts look once you get the EBC working.

I got it up to 10 psi at the redline with EBC at 100% duty. However, in a continuation of the story of me not knowing what I'm doing, turns out this turbo has a built in bypass valve. I didn't have anything connected to it, so it's certainly letting a bunch of air past under boost. I'm thinking I could just tee it in to the manifold reference that I have my BOV set up on, so they both release when I lift off. Then at some point I'll decide whether to stick with a BOV or run that bypass valve instead. Blockoffs for that valve exist. To be continued!

The turbo I have has a billet compressor wheel that's supposed to be good for an extra 30-50wph at the top end. I remain hopeful that I can hit 350/350 on E85

Any updates on this project??

Yes, it's with me right now, have it sorted out and street tuned up to 16psi flex-fuel currently on e70 it's an absolute animal. Hoping to dyno it this week or next. updates on Instagram, @vladituned

the way it makes torque it feels like a v8. seriously

That is awesome, I'm ready to pull the trigger on a K04 setup. Do you have a fuel sensor for running E70 or just different maps?

Flex fuel all the way. I can't wait to see what it puts down at dyno time with vladi's tune :)

My only concern is this motor is an 08'. I'm not shooting for the moon but bet your ass I'll put it through the ringer at 300 wheel. I reckon a proper tune is the recipe to a lasting boosted motor. Following on the IG can't wait to see the results.

I'm to understand that a small number of early '08s had forged rods, but the majority aren't. 300whp is aggressive for the powder rod version. To be safe you'd be better to stick to 275 or so, which will still be insanely fun because of the massive amounts of torque.

I reckon one day I will find out. Good thing junkyard motors are under a grand.

Updated numbers 290whp/392ft/lbs, and that's with losing traction on the dyno.
https://cimg1.ibsrv.net/gimg/www.mia...8e78af8c05.jpg
The drivetrain:
ZZP built short block
New gen 3 block LE5
forged Diamond 10.4:1 pistons
forged Molnar rods
new crank
stage 3 ported head
82lb springs
Inconel oversize valves
Fluidamper harmonic balancer
Flex fuel (dynoed on E60)
DW200 fuel pump
FlowFlorce 960cc injectors
stock LNF exhaust manifold
K04 turbo with billet "big wheel" compressor wheel
DDM 450ft/lb clutch
New Solstice AR5 transmission

Only revving it to 4500? Crazy tq numbers though.

The engine will rev to 7500-7800, but it couldn't keep traction on the dyno.

You need some dyno sauce.

We used 4 straps. I had my friend sit in the trunk. it still spun for some reason. We'll try a hub dyno if Nigel ever wants to

https://www.instagram.com/p/CLkvSTeH..._web_copy_link

She can't be contained!

That's bonkers. Would love to see numbers from a full pull. Congrats, gotta be a riot to drive.

Dyno sauce applied. 343whp/449wtq on a Mustang dyno.
https://cimg6.ibsrv.net/gimg/www.mia...ea985ec470.jpg

That torque drop looks insane until you realize at 7000rpm you're only 20ft/lbs less than my max.

:skid: bonkers

yeah the scaling on the plot is super confusing since he didn’t use the same for both.
this thing is an EFR7163 and a proper fuel pump/regulator away from a lot more power.
this is on a return less stock solstice fpr setup btw.

Yeah, that torque curve should be flat through at least 5k, with the power going way up. I'm surprised I got as much as I did out of a DW200. Still, the punch when you floor it at 3k is mind blowing.

It will be fun to see with a proper boost referenced system. Must be fun!

It is so fun!

WTF. Get some videos of this thing, that torque curve is hilarious (awesome).

https://www.instagram.com/p/CLkvSTeH..._web_copy_link

https://www.instagram.com/p/CLkvSTeH..._web_copy_link

https://www.instagram.com/p/CKsSX8sH..._web_copy_link

Nigel can take new/cooler vids. But my recollection of it goes like this: violent. raw. brutal. butt puckering. makes you laugh hysterically and sweat at the same time. need a cigarette after driving it and I don't even smoke.


I've tuned/driven many miata's. Quite a few of them well over 300 and at least a dozen over 400. This is a little different: at 2k this thing shoves you back like no BP could ever even dream of. The dyno sheet doesn't really tell the whole story. It PULLS and then it PULLS HARDER. Only big displacement and dual vvt can do this trick. Even on the dyno plot, take a look at the very beginning at 2k. It's at 220wtq at 2k basically. and then just shoots up

Coming out of a corner going uphill, you expect to have to roll on a lot of throttle at lower revs to get it back into the power. With this car, it feels like turning the corner was stretching some massive elastic, and dipping into the throttle releases it. It's hard to describe the feeling. The noise is something else too. The little turbo has an aftermarket billet wheel, and it just screams.

This basically exactly describes the only thing I loved about my cobalt ss/tc... the engine/turbo combo.. torque for days (although it does fall off up top a bit as mentioned)

Can only imagine how fun this is in a NB