Drivetrain Most boost ran on stock internals?
#1
Most boost ran on stock internals?
What is the most boost you can safely run on a stock N18 motor?
I hear everywhere mixed results.
14-15psi. 16-18psi. 18-20psi.
Anyone know the answer? I peak at 18.5psi and Terry from Burger Motorsports said I should turn it down to 15-16psi. What do you guys think?
I hear everywhere mixed results.
14-15psi. 16-18psi. 18-20psi.
Anyone know the answer? I peak at 18.5psi and Terry from Burger Motorsports said I should turn it down to 15-16psi. What do you guys think?
#5
Boost
I don't know about anyone else but I've seen my boost rise from a max of 14 psi pre JB+ incrementally over the course of 300 miles to:
Today 57 deg F and pulled 17.5 psi peak in fourth gear, I think somewhere around 5000-5500 rpm. I am extremely surprised. Every time I think I've hit the top end and been satisfied on boost it's bested the next day. As Nigel is quoted in Spinal Tap "This one goes to eleven."
Using 93octance Shell V-Power 10% ethanol blend. Measured with a Craven Speed Vac/Boost gauge with electronic sending unit and peak recall. In Chicago area (about 750 ft above sea level).
Terry does this sound reasonable and safe for my vehicle on 93 octane or should I back the dial down?
Today 57 deg F and pulled 17.5 psi peak in fourth gear, I think somewhere around 5000-5500 rpm. I am extremely surprised. Every time I think I've hit the top end and been satisfied on boost it's bested the next day. As Nigel is quoted in Spinal Tap "This one goes to eleven."
Using 93octance Shell V-Power 10% ethanol blend. Measured with a Craven Speed Vac/Boost gauge with electronic sending unit and peak recall. In Chicago area (about 750 ft above sea level).
Terry does this sound reasonable and safe for my vehicle on 93 octane or should I back the dial down?
#7
Boost
Thanks for the quick reply Terry,
The boost comes on quickly at starting at 12 psi and then climbs gradually with the engine through the rpm range which is nice as it helps minimize torque steer. I have not made any adjustments to the JB+. I'll keep an eye on it and continue to provide feedback. The car is almost "scary fast" now. I don't need a dyno to tell me your JB+ topped the total gains of my bolt on upgrades at about 1/7 the total investment. That being said I do think that they complement each other nicely however and would particularly recommend one of the various stepped intercoolers as a must first upgrade followed closely by an exhaust.
The boost comes on quickly at starting at 12 psi and then climbs gradually with the engine through the rpm range which is nice as it helps minimize torque steer. I have not made any adjustments to the JB+. I'll keep an eye on it and continue to provide feedback. The car is almost "scary fast" now. I don't need a dyno to tell me your JB+ topped the total gains of my bolt on upgrades at about 1/7 the total investment. That being said I do think that they complement each other nicely however and would particularly recommend one of the various stepped intercoolers as a must first upgrade followed closely by an exhaust.
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#10
#12
15psi on a mini with stock turbo is different than 15psi with a fp green turbo. Fp green turbo will flow waaaay more air.
Psi is just a measurement of pressure in the manifold.
Also, 15psi with intake air being 100 degrees is different that 15psi at 50 degrees. When you compress air a by product of that is heat, when you spin a small turbo to a higher psi, at some point it produces enough heat were its no longer worth it to raise boost.
Then when you start throwing in timing, octane, outside temp, fuel quality...ect
In the end..there isnt a perfect answer to your question...but if a tuner is telling you to back it down, I would just listen to him.
#13
I've added a pair of FCD's and have my MBC set to about 25PSI. OEM crank, rods, and pistons. Using a custom remote AP tune for 91 octane. Don't get on it much, but say a couple prayers every time I do. Been running this configuration for about 6 months / 6K miles --- no problems, YET! Still trying to find a good dyno tuner with Mini AP software, anywhere west of the Mississippi River.
Don't even think about doing something your tuner doesn't approve of --- tuning is everything!
Don't even think about doing something your tuner doesn't approve of --- tuning is everything!
#15
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