BNR GT2871 vs ZZP ZFR Turbo
Thread Starter
Senior Member
Joined: 02-13-11
Posts: 8,047
Likes: 0
From: Olney, MD
BNR GT2871 vs ZZP ZFR Turbo
differences ???
tbh I don't know much about the BNR 2871... but I know the inducer is the same size as the EFR, but 4mm bigger exducer.
and the EFR has a 5mm bigger turbine wheel than the BNR 2871..
whats the deal?
what do you guys know about the turbos?
all i know is the BNR is a lot cheaper, and makes a lil less power.
the other thread has over 20 pages now. I am not keeping up with it. haha.
tbh I don't know much about the BNR 2871... but I know the inducer is the same size as the EFR, but 4mm bigger exducer.
and the EFR has a 5mm bigger turbine wheel than the BNR 2871..
whats the deal?
what do you guys know about the turbos?
all i know is the BNR is a lot cheaper, and makes a lil less power.
the other thread has over 20 pages now. I am not keeping up with it. haha.
Thread Starter
Senior Member
Joined: 02-13-11
Posts: 8,047
Likes: 0
From: Olney, MD
Senior Member
Joined: 02-09-09
Posts: 4,374
Likes: 5
From: Tejas
The EFR was designed to be a fully inclusive turbo, with integrated BPV, WG, clockable housings, a broad curve, and ability to turn up the boost pretty high to boot. You can think of the EFR as a feature turbo. The thing that's also nice about it is that since it's got a lighter rotational mass, it spools like stock, while still flowing like a larger turbo on the top end... basically letting you have your cake and eat it too, since usually those two don't go together.
That being said, the BNR could go well with the parts you've already got, as was already pointed out. The upside is that it's an upgrade and gives a respectable bump in power for the price. The downside is that you do need more revs relatively speaking before it really hits its pace. With my E85 K04 setup against a 93 BNR setup, it was like a back and forth battle between torque and top end.
Overall, what's your goal? For a moderate power increase and a good value, I'd go BNR. For a better overall torque and power increase, and not needing additional supporting parts, I'd go EFR. You pay extra for the extras so to speak with the EFR and with your parts it doesn't sound like you'd need the extras anyway. Just some stuff to think about.
That being said, the BNR could go well with the parts you've already got, as was already pointed out. The upside is that it's an upgrade and gives a respectable bump in power for the price. The downside is that you do need more revs relatively speaking before it really hits its pace. With my E85 K04 setup against a 93 BNR setup, it was like a back and forth battle between torque and top end.
Overall, what's your goal? For a moderate power increase and a good value, I'd go BNR. For a better overall torque and power increase, and not needing additional supporting parts, I'd go EFR. You pay extra for the extras so to speak with the EFR and with your parts it doesn't sound like you'd need the extras anyway. Just some stuff to think about.
Thread Starter
Senior Member
Joined: 02-13-11
Posts: 8,047
Likes: 0
From: Olney, MD
The EFR was designed to be a fully inclusive turbo, with integrated BPV, WG, clockable housings, a broad curve, and ability to turn up the boost pretty high to boot. You can think of the EFR as a feature turbo. The thing that's also nice about it is that since it's got a lighter rotational mass, it spools like stock, while still flowing like a larger turbo on the top end... basically letting you have your cake and eat it too, since usually those two don't go together.
That being said, the BNR could go well with the parts you've already got, as was already pointed out. The upside is that it's an upgrade and gives a respectable bump in power for the price. The downside is that you do need more revs relatively speaking before it really hits its pace. With my E85 K04 setup against a 93 BNR setup, it was like a back and forth battle between torque and top end.
Overall, what's your goal? For a moderate power increase and a good value, I'd go BNR. For a better overall torque and power increase, and not needing additional supporting parts, I'd go EFR. You pay extra for the extras so to speak with the EFR and with your parts it doesn't sound like you'd need the extras anyway. Just some stuff to think about.
That being said, the BNR could go well with the parts you've already got, as was already pointed out. The upside is that it's an upgrade and gives a respectable bump in power for the price. The downside is that you do need more revs relatively speaking before it really hits its pace. With my E85 K04 setup against a 93 BNR setup, it was like a back and forth battle between torque and top end.
Overall, what's your goal? For a moderate power increase and a good value, I'd go BNR. For a better overall torque and power increase, and not needing additional supporting parts, I'd go EFR. You pay extra for the extras so to speak with the EFR and with your parts it doesn't sound like you'd need the extras anyway. Just some stuff to think about.
my goal (haha, probably everyones goal)
but my goal is to be at around 20-24 psi, not too much stress on the motor. on pump gas. i want to be the fastest from highway rolls. like a 30+ roll or something.
i want to be over 380whp on pump gas. but also less than 24psi of boost pressure.
and maybe in a year or so e85
but for now this is going to be my daily for the next 5 years so i don't want things like e85 yet....
Senior Member
Joined: 02-09-09
Posts: 4,374
Likes: 5
From: Tejas
thanks for the highly informative reply..
my goal (haha, probably everyones goal)
but my goal is to be at around 20-24 psi, not too much stress on the motor. on pump gas. i want to be the fastest from highway rolls. like a 30+ roll or something.
i want to be over 380whp on pump gas. but also less than 24psi of boost pressure.
and maybe in a year or so e85 but for now this is going to be my daily for the next 5 years so i don't want things like e85 yet....
my goal (haha, probably everyones goal)
but my goal is to be at around 20-24 psi, not too much stress on the motor. on pump gas. i want to be the fastest from highway rolls. like a 30+ roll or something.
i want to be over 380whp on pump gas. but also less than 24psi of boost pressure.
and maybe in a year or so e85
but for now this is going to be my daily for the next 5 years so i don't want things like e85 yet.... Either you'll need 25-26psi from what we've seen so far to make the power you're wanting, or you're going to need to go larger than what you need with the EFR, so you can bring the boost pressure back down.
Junior Member
Joined: 07-18-12
Posts: 408
Likes: 0
From: Brinklow MD
i'm kinda curious here actually, if you run a bigger turbo at 20 psi vs the stock k04 at 24, is either one worse than the other?? (assuming we're not talking a huge turbo at 20, just like zfr)
Senior Member
Joined: 03-03-11
Posts: 1,069
Likes: 0
From: Pottstown, PA
Nah, Not IMO, The KO4 is out of its efficency range at right about 25PSI +, So at 24PSI you would be fine, IMO I would rather have a close to stock spool(Full Boost at 2,800-2,900RPMs)
The Zzp efr is worth the cash if you want to spend it. Same with the bnr. The Zzp efr I beleive is a 6758 which is a small exclusive turbo. The bnr is a small but mighty turbo, but it does have its efficiency like the 6758. The actual efficiency of te 6758 is better then then the bnr.
The longitivity of the engine with a quick spool from the efr will causes issues internally more then the bnr. Due to the extensive tq te efr will give due to quick spool. So the basis of what you want comes into play. Put it like this:
Efr spool time vs bnr... Efr
Efr efficiency vs bnr.... Efr
Healthier and less hard on engine with no ramp just turbo actual spool up "no holding back".... Bnr
Power of each (which one can create more power)? ...... Efr
Easier bolt on? Efr
The bnr is a great turbo for 360-400ish
Flow is there being 45-47min lbs. it that will only get you so far power wise. Unless the dyno you go to is very high at reading numbers. Only way to get high numbers is on a added fuel system and ethanol mainly and high boost and aggressive tables.
Ko4 is inefficient at 22.5-23lbs
The longitivity of the engine with a quick spool from the efr will causes issues internally more then the bnr. Due to the extensive tq te efr will give due to quick spool. So the basis of what you want comes into play. Put it like this:
Efr spool time vs bnr... Efr
Efr efficiency vs bnr.... Efr
Healthier and less hard on engine with no ramp just turbo actual spool up "no holding back".... Bnr
Power of each (which one can create more power)? ...... Efr
Easier bolt on? Efr
The bnr is a great turbo for 360-400ish
Flow is there being 45-47min lbs. it that will only get you so far power wise. Unless the dyno you go to is very high at reading numbers. Only way to get high numbers is on a added fuel system and ethanol mainly and high boost and aggressive tables.
Ko4 is inefficient at 22.5-23lbs
Last edited by Chevycobaltss3; Sep 22, 2012 at 11:14 AM. Reason: Automerged Doublepost
Thread Starter
Senior Member
Joined: 02-13-11
Posts: 8,047
Likes: 0
From: Olney, MD
The BNR can make the power you're looking for, but it'll be making that power around 26psi (from what I hear... also about as high as you'd probably want to go with it). That sounds like it's higher than you want to go, so the only way to bring boost pressure down is to have cooler air; in this case going with a larger turbo like the EFR since you've already got an upgraded IC and want to stay away from E85.
Either you'll need 25-26psi from what we've seen so far to make the power you're wanting, or you're going to need to go larger than what you need with the EFR, so you can bring the boost pressure back down.
Either you'll need 25-26psi from what we've seen so far to make the power you're wanting, or you're going to need to go larger than what you need with the EFR, so you can bring the boost pressure back down.
i thought the EFR and the BNR was relatively the same size ?
The Zzp efr is worth the cash if you want to spend it. Same with the bnr. The Zzp efr I beleive is a 6758 which is a small exclusive turbo. The bnr is a small but mighty turbo, but it does have its efficiency like the 6758. The actual efficiency of te 6758 is better then then the bnr.
The longitivity of the engine with a quick spool from the efr will causes issues internally more then the bnr. Due to the extensive tq te efr will give due to quick spool. So the basis of what you want comes into play. Put it like this:
Efr spool time vs bnr... Efr
Efr efficiency vs bnr.... Efr
Healthier and less hard on engine with no ramp just turbo actual spool up "no holding back".... Bnr
Power of each (which one can create more power)? ...... Efr
Easier bolt on? Efr
The bnr is a great turbo for 360-400ish
Flow is there being 45-47min lbs. it that will only get you so far power wise. Unless the dyno you go to is very high at reading numbers. Only way to get high numbers is on a added fuel system and ethanol mainly and high boost and aggressive tables.
Ko4 is inefficient at 22.5-23lbs
The longitivity of the engine with a quick spool from the efr will causes issues internally more then the bnr. Due to the extensive tq te efr will give due to quick spool. So the basis of what you want comes into play. Put it like this:
Efr spool time vs bnr... Efr
Efr efficiency vs bnr.... Efr
Healthier and less hard on engine with no ramp just turbo actual spool up "no holding back".... Bnr
Power of each (which one can create more power)? ...... Efr
Easier bolt on? Efr
The bnr is a great turbo for 360-400ish
Flow is there being 45-47min lbs. it that will only get you so far power wise. Unless the dyno you go to is very high at reading numbers. Only way to get high numbers is on a added fuel system and ethanol mainly and high boost and aggressive tables.
Ko4 is inefficient at 22.5-23lbs
Thread Starter
Senior Member
Joined: 02-13-11
Posts: 8,047
Likes: 0
From: Olney, MD
Thread
Thread Starter
Forum
Replies
Last Post
