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

[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....

[Boru]

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..?

The engine is capable of making far more power with a bump in boost, fuel, etc. but there really is no point unless you're looking to wave a Hp number around... a number that you can only realize on a dyno. The chassis is more of a limiting factor than anything else.

[Shadow]

What do you mean no point?

[stoney]

There comes a stage where more power on the street is pointless, 500hp is more than enough to put you over twice the speed limit in just a few seconds.

If it was a drag car, or did some circuit work etc, you might want all the power it can produce, but at the same time, what then becomes the weak point? Start destroying CV's in the driveshafts, blowing up diffs, tailshafts etc.

I can possibly see the point of tuning it for a higher boost setting so you could switch to on the odd occasion for extra fun, but I still haven't even done that on my Skyline, and 17psi is more than enough (350rwkws) even though my whole setup is good for 30psi, same reason here, gearboxes become a weak point, tyres dont last half as long, I prefer to keep my license and so on.

If you've ever driven a 500hp at the wheels car, you know it's more than enough for the street

[Shadow]

More than enough for who and for what? More than enough for the Prius guy? You?
Not me.




btw todds your build is fantastic just commenting on the "who needs THAT much power. Pointless!" excuses I'm seeing.

[Boru]

btw todds your build is fantastic just commenting on the "who needs THAT much power. Pointless!" excuses I'm seeing.

Clearly you know more about Todd's build than I.