BNR Sequential vs non-sequential
 

Just ran across this dyno graph, which I thought was pretty interesting and worth sharing. It's an overlay from my car before and after the non-sequential conversion with BNR turbos. I converted because this was a track car and I didn't like the way the dip in the transition disrupted power delivery.

I don't have the ambient temps, but IIRC the non-sequential was spring time (march/april) and the sequential was morning time in either June/July in Atlanta.

Same Dyno machine
Same tuner (Steve Kan)
Same engine
Same turbos
Same boost controller and boost level (15 psi)

Only difference here is the conversion from sequential to non-sequential and the time of year. Not a perfect back to back, but still a better comparison than most i've found...

overview of mods -

Mild Street port - Rick Engman Mazmart
Gasket matched UIM/LIM
HKS V-Mount Intercooler (it is pretty massive)
Downpipe/testpipe (no cats)
Racing Beat catback
UR lightweight pulleys (not underdrive)
Power steering delete
Air conditioning delete
Air pump delete ( w/ Tweakit pulley)
Double throttle removed
550/2000 injectors (injector dynamics secondary)
HKS twin power
Power FC
Greddy Profec B Spec II
93 Octane Shell Pump gas, running regular OMP no premix.

Danny-

Overall, as a track car the loss of power down low is not even noticeable, basically from 4200rpm on the non sequential is better and I'm rarely ever below 4000 RPM while driving on the track. I've taken the car around town and from a complete stop, the non sequential's definitely lack the ridiculous punch that the sequential set up provided, but they're perfectly smooth.


Danny~

interesting. been looking for just such a comparison.

Thanks for posting that up. Seq for street and autox and non seq for the track.

Sequential fun factor is untouched, knowing your shit is going to work right everytime you hit the gas is the reason I always put cars togther NS. AutoX is a no brainer to stick with sequential, other than that you have to weigh the pros and cons of each.

I have to say, with the newest BNR Stage 3s sequential offers a much more streetable powerband. I wouldn't go any other way.

:nod: i agree.
on this thread they have non seq and seq dyno sheets for stage 3
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/bnr-stage-3-turbos-966671/

Nice, was never able to find a comparison. Thanks though. I plan on doing the opposite of the OP, run the BNRs NS for a bit and gather new OEM components for the sequential system.

Doesn't the custom solenoid rack help alot with the transition? Everyone has been saying that you don' feel it anymore when the rack is installed.