Sorry guys, I made a huge mistake interpreting the hp chart for the BNR stage 3s on my excel plot that a LOT of people read. This was a BNR Stage 3 non seq vs M2 seq comparison to try and show the spool between each, NOT upper end hp as the setups were different.

Here is the original sheet for the BNRs http://66.216.67.51/images/products/dynos/dynograph.jpg
If you look you'll notice the hp/tq scales are different.

Here is the new excel plot, with the sequential M2s way ahead in the low end. Sorry to bring this up, but I had to correct myself. Both sets still kick ***!

 

how hard is it to make that excel file into a jpeg. im too stupid to convert due to my lack excel software.

paul

 

 

Hmm, the only thing I get out of this is that sequential is better with a ported engine and parallel is better with stock. Acording to the spreadsheet parallel max's out at 6500rpm but sequential keeps increasing past 7500rpms.

I have no idea what you corrected but a real comparison would be both twins in either parallel or sequential and not both. Moreover, at the same boost levels and same mods. That chart is a bit deceiving without all the info and makes the M2's look pretty sad.

 

But you also have to remember that once the sequential hit 4500 rpm both turbos are working. So according to the chart above 4500rpm the BNR stage 3 are making more power. If artguy tunes his M2 more then maybe it'll be a better comparison.

 

That definitely makes more sense. It was hard for me to believe that non-seq upgraded twins were making more power than BB sequential twins down low. The M2s are at a disadvantage with having a non-ported motor, hi-flo cat, and 15 psi where the BNR FD has a midpipe, streetport, and 17 psi. Both sets should be very comparable when run with the same setup. One of these days I'll get me dyno results at 16 psi and can compare them to artguy's eventual dyno results - he has the same exact mods as me I think - even down to hi-flo cat.

 

Here is another take: The M2's show more HP below 4k rpm which in med-heavy city traffic your shifts will be about 3500pms so the M2's will feel torquier instead of slingshoty (BNR). The M2 seems smooth, with the exception of the transition which needs to be ironed out.

If the BNR car had a street port then it's possible the 25hp difference below 4k rpm it lacked was the reason.

If we can get a chart with the BNR's on a stock ported motor and the HP below 4k matches the M2 set, then BNR is the Twin Turbo Guru!

 

Yeah, read the original thread for the BNR dyno numbers and this will make a lot more sense. It was NOT a hp comparo, just trying to show the excellent spool of the BNR non seq compared to the M2 BBS running sequentialy IN THE LOW RPM....but since I misread the chart, they don't spool nearly as well as I let everyone on to believe. Thats all

 

why even compare sequential to a non sequential setup?

 

Read the thread, that was the whole point. Its seemed as if the the non seq actually did better than the seq down low.

 

I agree with GoRacer... you can't compare apples and peaches, because they're totally different! You are either comparing the differences between the two manufacturers(BNR vs M2) with the same set up or you are comparing the differences in performance between non-sequential or parrallel with the same set up. I think that when making comparisons, you can't have more than the other as far as upgrades. When making comparisons you need to have the same set up, just using a different brand for the comparisons that you are trying to make. I over emphsized the word comparisons, but isn't that what we're talking about here? my 1 sense, i think.


see ya,
car 53

 

Also, you guys might remember from the first thread that I have A LOT of tuning to do on the bottom end, its basically untuned. If you notice how the hp curve dips down to the right in the bottom instead of being a nice curve you can see how the tuning is affecting it.

I was running between 1 - 2 a/f's to rich on the bottom which is going to make a HUGE difference in power and spool up.

I'll get around to tuning that out one of these days but I've been to busy. I'm working a lot and in the middle of buying a new house so I just dont have any time. It'll prob be a few months before I get that worked out. I dont really want to mess with it right now anyway, I'm having to much fun just driving it LOL

STEPHEN

 

Stephen,
I know what you are going through with the house. Just built my first new house. In the process, I had to sell all my mods and all mods that were going into the 7. Now all that is done, I finally got time to work on my baby and start from stratch...
Just to let people know that the Group buy is going to be ending in MID-Feb. to own one of these upgrade for around $1,800.
IMHO, that is a steal for the FUN you get from a sleeper look 7. Please spread the word...

http://www.nopistons.com/forums/inde...T&f=21&t=11711

Ken