My turbo is dying so I'm considering a Stage 2 upgrade from BNR & I was told that it would work on the stock fuel/ECU (I have no time nor money to do fuel/ems).

I only want to run stock boost levels but I really want to make sure that a "T04B compressor wheel & compressor cover" with stock fuel won't blow the engine.

Now my understanding is that regardless of what kind of turbo it is, 8psi will always be 8psi.

If that is true, that means that turbo upgrades only make more power because they push more air, correct?
Generally, there is no smaller turbo that will make equal amounts of or more power than a larger turbo, correct?


And if anyone can shed some more light on how a Stage 2 hybrid can run fine on the stock fuel/ems, it would be greatly appreciated!

(S5 TII)

 

It should be fine.

The stock fuel injectors (4x550's) can easily support 250bhp at the flywheel.
The stock fuel pump (at full voltage) will support about the same power levels.

I don't think the BNR Stage 2 hybrid can hit that kinda power levels at 8psi.


-Ted

 

If BNR is going to take your money, then they also need to take your questions. Usually, not too many people know the product better than the manufacturer.

With regard to manifold pressure, yes, 8psig is 8psig, but not all boost is created equal. The design of the turbo may allow it to produce the boost more efficiently, which can result in:
1) Less temperature rise, which means more dense air at a given pressure, which means more power.
2) Less turbo rpm required to produce the same boost, which means the boost will rise faster. Depending on the compressor, this may also allow for more boost at a given turbo rpm.
3) More airflow at a given pressure, which may keep boost from dropping at higher rpm's, and/or result in a steeper stall threashold which allows for more boost at lower turbo rpm's.

It's not really big or small as much as the "correct" size that will make the most power. Also, the design has a lot to do with performance.

 

thanks for the help guys!!
it's always good info when 2 bigwigs of RX7Club chime in

I will try to get more info/clarity from BNR but I just didn't want to pester him with what should be very basic knowledge to them when they are/should be very busy.

 

You guys can come with questions anytime. You don't pester me a bit. .

Bryan@BNR