Euro 535i LS Turbo Build Thread - 7/10/19 Dyno update

[Kyle in NO]

Damn.

[wkohler]

This sounds like a car Kyle owns.

[T_C_D]

Update. Turbo never smoked again but the 2pc intake manifold split again and was leaking. Took a few weeks but I bought a LS6 factory manifold and got it installed last night. Hoping to be able to get some miles on it now.

[wkohler]

Sexy.

[Hffvdbl]

That looks really good Todd

[Duke]

Strut bar wont work.

[T_C_D]

I finally have some seat time with everything seemingly working properly. I ordered 80lb injectors today because the 50lbers are maxed out by 5500rpm. Engine feels very strong. Much stronger than anything I have ever driven. Looks like it's going to be exactly what I envisioned.

[Mark 88/M5 Houston]

I finally have some seat time with everything seemingly working properly. I ordered 80lb injectors today because the 50lbers are maxed out by 5500rpm. Engine feels very strong. Much stronger than anything I have ever driven. Looks like it's going to be exactly what I envisioned.

Sounds great Todd, keep the updates coming.

[Brad D.]

I finally have some seat time with everything seemingly working properly. I ordered 80lb injectors today because the 50lbers are maxed out by 5500rpm. Engine feels very strong. Much stronger than anything I have ever driven. Looks like it's going to be exactly what I envisioned.

That's awesome. Do you have plans on dyoning once you install the new injectors?

[Shawn D.]

I finally have some seat time with everything seemingly working properly. I ordered 80lb injectors today because the 50lbers are maxed out by 5500rpm. Engine feels very strong. Much stronger than anything I have ever driven. Looks like it's going to be exactly what I envisioned.

Awesome!

[T_C_D]

I finally have some seat time with everything seemingly working properly. I ordered 80lb injectors today because the 50lbers are maxed out by 5500rpm. Engine feels very strong. Much stronger than anything I have ever driven. Looks like it's going to be exactly what I envisioned.

That's awesome. Do you have plans on dyoning once you install the new injectors?

Hopefully end of next week.

[stoney]

What was the reason behind fitting the smaller stroke crank?

Do you plan raising the rpm ceiling?

At what boost are these turbos in their efficiency range?

[T_C_D]

What was the reason behind fitting the smaller stroke crank?

Do you plan raising the rpm ceiling?

At what boost are these turbos in their efficiency range?

I wanted the short stroke for fun. super safe rev limit is 7000 instead of 6500. Turbo is happy in the 8-15psi range for this motor.

[T_C_D]

Nice weather this morning (78F). I went to a new dyno shop that specialize in LS motors but both of their tuners were absent so I was on my own. AFR in the mid 11s and timing is probably close. Boost not super smooth and tapered a little or it would have made more HP. That being said I am super happy with the result. The way this engine makes power is exactly what I wanted. Will be bumping the rev limit a few hundred rpm since it is so happy at 7000rpm. Plenty of room for more boost if I wanted but highly unlikely since the engine will make a lot more power at the dragstrip in cooler temperatures.



https://youtu.be/tJ9jK9gInxU

[Mark 88/M5 Houston]

Looks quite nice Todd; congratulations!

[tig]

[Bill in MN]

It's time for that engine to get transplanted into my chassis.

[Jelmer538i]

Nice!

[Kyle in NO]

It's time for that engine to get transplanted into my chassis.

But doesn't your chassis reject transplants?

[wkohler]

hahahaha.

[turbodan]

That dyno chart is beautiful.

[T_C_D]

That dyno chart is beautiful.

Thanks Dan. I spoke to the cam designer and he thinks I am missing a little power at 6500rpm. It should peak there, not be flat. I was able to finally plot the required airflow across the turbo compressor map and the turbo is undersized. Compressor is operating at 68% efficiency above 5500rpm. Both the compressor wheel and the turbine need to be a little bigger. They are currently 67mm billet and P trim. This winter I'll go to 72mm billet and Q trim. The 72mm will be operating at 78% above 5500rpm. This will really help the top end. I think 535+ at a solid 10psi should be easily attainable.

[offroadkarter]

Hey Todd, I do believe I came across your car on the internet






Source: https://www.flickr.com/photos/136164148 ... 8575261346

[ldsbeaker]

Wow! That is some terrific power!

[Bill in MN]

It's time for that engine to get transplanted into my chassis.

But doesn't your chassis reject transplants?

Oh now aren't we cute

Nice job Todd!!!!

[Good & Tight]

Those #'s are without the turbo hooked up right..?

[T_C_D]

Those #'s are without the turbo hooked up right..?

[Good & Tight]

Those #'s are without the turbo hooked up right..?

Todd was kidding about the turbo not being hooked up. It's a nice flat power band, just thought it would make north of 600 being an LS engine.
What psi was that dyno run..?

[T_C_D]

Those #'s are without the turbo hooked up right..?

Todd was kidding about the turbo not being hooked up. It's a nice flat power band, just thought it would make north of 600 being an LS engine.
What psi was that dyno run..?

It's a baby motor. 4.8L with big bore, 9.5CR at a little less than 10psi. It's making exactly what it should. About 20-23rwhp per psi of boost. 5 more psi and it's way over 600rwhp but I doubt I'll ever do that. My intention is to optimize the current setup and tweak the boost a tiny bit. It drives so great I doubt I'll ever chase a dyno number.

[mkoepp]

You have one sweet ride there Todd. A pure thing of beauty and a sleeper too......Congrats....