You my friend, have brass ***** 😂

 

Hi Bruno,
Do you know your boost before 5000rpm?

My 997 achieves the same times with the same turbos but via a different way: E85, 3,8built engine, only 1,65Bar.(23-24psi)
Curious you need so much boost, probably only at top end to compensate very low boost at midrange and preserve the stock internals.

 

Would also like to know?

 

Hi Sam,

Yes you might raise the boost slowly from pretty low, stock engine.
Nevertheless 850hp seems not so high regarding 32psi at top end.
Whp or crank hp?

 

Very Fast Brunno Congratulations!

I'm pretty confused now, is your car still running VTGs?

And is the car tuned by Cobb directly or a Tuner who uses Cobb would be interested to know.

Thanks!

 

What is your set up?

Before I posted this I looked up your previous post and all I saw was a introduction just saying “hi” & then BANG!!!... Crazy power and times from a stock engine set up!!

So far we have the introduction, conclusion to the book, but can we please have the “body” of the book now?!...LOL.

 

+1 would like to know as well, so many shops coming up with numbered performance stages that don't make any sense to me (stage 1,2,3,4,5,6,7,8...etc)

 

Guys I don't think Bruno's numbers are far off, they make sense to me. If you look at the setup it takes that much boost to get there. The fuel difference, stock heads and cams(thats ~3psi right there), I believe he is still using smaller intercoolers (restriction), how does the exh look? The turbine housings are the TiAL bolt on ones (start to become restrictive). etc etc. As the engine gets pushed up with this set up the pumping work is going up considerably, we spend energy in pumping losses instead of converting it into power.

With E85 or race fuel (to add plenty timing), ported heads and cams, and bigger turbine housing this engine will achieve this same power at a much lower pressure. Adding displacement will obviously help too. Just keeping it simple and high level here.

 

Is this still on VTG's? Or Tial/Xona/Garrett?

 

I believe its Xonas 3073(or 5756 or XR980 whatever naming they want to use today lol) on the TiAL bolt on housing, internal wgt.

 

Looks like a Stage 5 & 3/4 or 6 & 1/2

 

Oh I was thinking VTG lol, thought the boost curve would look like the Eiffel Tower lol.

 

Boost alone is not enough info, let's compare compressor maps...

 

That would be nice wouldn't it? Unfortunately aftermarket turbo suppliers do not do gas stand testing and even if they have some information its not published. I'm won't dive into this cause I would never get off my soap box

Anyways we would expect to see Bruno's car at a higher pressure ratio at similar flow. Indicating a lower VE and higher pumping work. If we had relative humidity and ambient conditions then we could compare Bruno's vs. XYZ car VE at the intake manifold conditions. It would clearly show the difference of why one engine has to work much harder than the other from a pressure perspective. Comparing timing would be another good one. I have some estimates on the thermal efficiency of a stock 3.6L and a built 3.8L as well which we can compare that. Multiple ways to slice this.

I have some comparisons of the effects of heads and cams at a lower airflow (850-900hp crank) and its worth around 50-60hp which is around 2.5 to 3psi. Comparing the available density in the intake manifold we see a measurable shift in VE aligning with the gain in HP.

 

I see Precision Turbo does not, that is pathetic. I've always had Garretts and BorgWarner turbos - they do. Ah well.