I like how you can determine that a Precision will be efficient at a given pressure ratio with no compressor map. Mad skillz.

 

Sure there is no map for it . But not hard to determine what the map will look like once you consider wheel size and compare with other similar turbos .... Why do you hate precision arca ? Results from the rx7 forum plus the fact that it's a copy of the gt3582 helped as well .

 

I see more FI motors popping than drivetrains. If you think your intended gool is any easier on the drivetrain then you have my good thoughts. There's no need to feel like you have to defend your choices. I only bumped your comment because you dismissed the choice solely based on your own goals, which not everyone will share. It's simply a choose your low rpm vs high rpm poison situation

You don't seem to always have a grasp on choke line IMO. The reason a GTX3076 is a bad choice is because the 60mm turbine is too small for the compressor. The GT3576 jumps the turbine up to 66mm, but then the compressor is not up to the task unless you intend to make low end power like the 7670 we just discussed. 6266 suggests a 62mm compressor inducer and 66mm turbine exducer. For a Garrett comparison, the GTX3582R would be more suitable to achieve your goal.

 

Answered it for me.

 

 

No idea why you think I was defending a choice . I haven't even bought anything yet . I was talking about the best turbo for the job of making good power that could actually fit in a low mount setup. What you have suggested is another possibility and I accept that many might consider it as an option as well . But why not have your cake and eat it too ? It has already been proven that a BB 6266 turbo can spool as well as a Greddy so it would give you low down torque plus top end .

Just because I didn't fully understand it once doesn't mean I don't now . I don't think anybody around here did ....including yourself .
Those Borg Warner maps actually really helped me to understand it because they actually tell you what happens outside the traditional map . I asked about this years ago and no-one could give me the answer that we now see on those maps. A few liked to pretend they knew ... funny.

Yeah .... that would be my preference over the Precision . But the size of the turbo intake is a major PIA .... Maybe there is a way around it ...........

 

There is no 'have your cake and eat it too'. It's a series of compromises; which part of the cake that you prefer to have and eat.

We all learn as we go, I get it ...

 

Heh

Slight negatives but none of them a dealbreaker.

 

Apparently the EFR7163 fits in the low mount position and RHD to boot, liking the manifold & engine mount too




don't car much for his rear front subframe cross-brace though




giving this guy props just the same , anyone now who he is?


.

 

That has to be the most random build video I've ever seen . Kudos for them getting it down there . I wonder if they modified the firewall much to achieve it ............

hmmmm 7163 ...... Gunna spool like a **** but pretty inefficient at the top end

 

a generic statement that's not backed up on the BW sizing program

the 7163 in particular has a compressor wheel design that no other EFR has yet

 

did you mean it would spool slow Brett? Cause the 7163 will spool fast... On every platform I've seen the 7163 and the larger 8374, the spool is incredible

 

Quite the opposite ....

 

Numbers with corrections; still not that bad IMO; 56*F compressor outlet delta across the efficiency range. The pressure differential is high, but it's the price to be paid for the killer response down low. It just depends where and how much you want to make. How many daily drivers will be at 7500+ for long periods of time? Not many ... all workable IMO. Shift and use torque, use a 3.9 rear gear too. Never claimed it to be ideal, but not a deal killer IMO.

 

Try plugging in the correct Compressor efficiency figures and let's see what you get .................

 

Hmm, thought it was doing it automatically, good point

 

Also have a look at delta pressure at that boost .
Hot intake air and high back pressure . Not a good combo on a high compression rotary IMO.

 

Maybe not a....... "deal killer" ... but an........ 'Ideal killer'....... of renesis engines .Has the ability to flow a lot of air at poor efficiency and high back pressure .
I agree it's a real street weapon , but this thread is about 'Renesis turbo efficiency' and that one .......isn't.


Getting back to the video ..... I find it interesting that they did all they could for flow everywhere else in the system but they may as well not have bothered because the determining factor will be the amount of backpressure created by the turbine . That's the way I see it anyway .

 

You've been doing it for years, but didn't have a program pumping out numbers to show how fubar the turbine relationship was for open forum criticism

not to mention the atta-boy sans criticism for the GT3076R top mount thread

Jeebus

 

16psi at 2000RPM? Yeah that's why those backpressure numbers look skewed. Raise it to hit 10psi at 3k and 16psi at 4k and you have a quite reasonable setup on high and low end. Or even 16psi at 3k.

The turbine sizing is the best part of that calculator, but it only works if you use it correctly.
And hey it even takes EGT into account...

 

and you have been telling us how it should be done for years witrhout ever doing it your self

double Jeebus +

 

True, I'm not in a position to do a turbo yet relative to my race class interest. Just the same, it has no bearing on my previous post.

 

My post is funnier because it's more accurate

 

Any chimp can sling their own sh-t to make a totally irrelevant diversion ...





You're just as caught out here as the throttle body discussion, Greddy compressor upgrade discussion, center plate removal discussion, deeper RX7 apex seal discussion, etc.



When you point out my mistakes like missing the BW program did not automatically compensate for their own compressor map efficiency I don't have any problem saying I goofed and posting up the correction ...



But I'm done trying to counter your dodging. Everyone can decide on their own ...

.

 

OK ....................... back on topic then


True - I've been maxing out an undersized turbo for over 6 years now ... maybe I learned something relevant to the Renesis in the process .......... .

BTW : A month or so ago you put me down for using that Matchbot program to make some rough guesstimates about a non BW turbo . From your earlier post (now deleted) it's obvious you didn't even know how it worked yourself ! Now that you know - perhaps an apology is in order ? JK

It's called constructive criticism without being an *** . A concept you seem to have no clue on .