NB built BP4W, GT2560R, 16-17psi
#22
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Yeah it's gonna be interesting, have an HPDE the following weekend so a little more top end pull will keep those pesky vetts close enough in the straits to bug em in the turns. I can keep the revs between 5000-7400 which should be high enough to make the HP without the torque
#27
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93 octane, stock fpr. I don't have a fuel pressure gauge but with 550s my duty cycle is about 84% at redline. Pretty much maxed out the injectors they might have a little left in them. I'm pretty much at the limit of my setup, injectors/turbo. But I'm happy with it.
#28
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Your duty cycle suggests you are in the 300whp range. I'm actually surprised my duty isn't higher honestly. Maybe the Hydra and ms3 read duty cycle differently? I'm really curious what kinda power your making. I read your build thread, in one picture I saw your turbine wheel. It looked clipped and I swear it has one less blade than mine. Is it a straight 2560? Or do you have a gt28 turbine wheel?
#29
Yeah the wheel has seen some things, the small chip isn't too bad but it's there. It's not a 28 wheel as far as I know, just a journal bearing 2560. Duty cycle is duty cycle, so should be the same. I'm running pretty rich, that might explain the difference......or I'm just making way more than i think.
#30
Your duty cycle suggests you are in the 300whp range. I'm actually surprised my duty isn't higher honestly. Maybe the Hydra and ms3 read duty cycle differently? I'm really curious what kinda power your making. I read your build thread, in one picture I saw your turbine wheel. It looked clipped and I swear it has one less blade than mine. Is it a straight 2560? Or do you have a gt28 turbine wheel?
#31
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Yeah the wheel has seen some things, the small chip isn't too bad but it's there. It's not a 28 wheel as far as I know, just a journal bearing 2560. Duty cycle is duty cycle, so should be the same. I'm running pretty rich, that might explain the difference......or I'm just making way more than i think.
#33
I data log my fuel pressure and actually had a 255, it does over power the NB regulator at low PW, would rock up to 70psi and caused all kinds of funky transient fueling issues. I would see about 58psi at redline with the 255 still, with the 190 I see 56-57 psi. I chalk this up to pressure drop through the lines since both pumps are over kill for this power level.
#34
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I data log my fuel pressure and actually had a 255, it does over power the NB regulator at low PW, would rock up to 70psi and caused all kinds of funky transient fueling issues. I would see about 58psi at redline with the 255 still, with the 190 I see 56-57 psi. I chalk this up to pressure drop through the lines since both pumps are over kill for this power level.
#35
Where I saw the problem was on AE, if I was at part throttle the fuel pressure would be at 62 psi and on a throttle stab the motor would want a certain amount of AE. If I was off the throttle in overrun the fuel pressure would be in the low 70's and a throttle stab would nearly drown the motor.
#36
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Where I saw the problem was on AE, if I was at part throttle the fuel pressure would be at 62 psi and on a throttle stab the motor would want a certain amount of AE. If I was off the throttle in overrun the fuel pressure would be in the low 70's and a throttle stab would nearly drown the motor.
#37
For the others that are following along, my dyno day was a bust. I have some odd issue going on where the motor is surging and not making power. Replaced coils and plugs with no improvement, changing cam and crank sensors next and then fixing with an LS swap after that.........aren't race cars fun.
#38
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For the others that are following along, my dyno day was a bust. I have some odd issue going on where the motor is surging and not making power. Replaced coils and plugs with no improvement, changing cam and crank sensors next and then fixing with an LS swap after that.........aren't race cars fun.
It really sucks that it runs perfect for so long then hates life right when you want to Dyno it lol. I understand the LS swap thing, however I actually like the BP... This makes me tarded' obviously.