99 FD turbos vs 95 BNR s3 turbos
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99 FD turbos vs 95 BNR s3 turbos
Hey everyone I want to see what everyone thinks of these turbos I want to setup my car for touge track and everyday used so I'm not sure witch one is the best for me bcuz I'm looking for a turbo that has small lag and makes good power and is not to much of a pain to deal with , well I hope I can get some good feed back and I'm doing all the fuel upgrades too with the turbo .
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ya sorry I'm posting from my dumb phone at the airport , but ya I have done a bit of research and I want to see what everyone thinks of them bcuz the 2 of them sound good but are they good for what I'm looking for? bcuz I dont care if I can make 450hp I care more of making HP that I can used for what I'm doing.
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The BNR's are cheaper, and can be repaired. Don't think anyone repairs the OEM turbos that I know of.
The BNR's can run much higher boost. Problem is the support system (solenoids, etc) isn't very reliable over 10psi. There is a solution to the solenoid situation with using better ones.
The achilles heel of the sequential system is all the vac hoses, chambers, solenoids, actuators and check valves. The OEM parts were never designed over 10 psi, and the sequential system is notoriously difficult to understand and fix. It's also hard to get to crammed mostly under the UIM. This is why most people go single turbo.
I'm hoping with the new solenoid setup I'll be able to eliminate the OEM problems of complicated vac hose setups and crappy solenoid problems. Check valves can be upgraded as well to viton.
We'll see what happens, can't hurt trying
The BNR's can run much higher boost. Problem is the support system (solenoids, etc) isn't very reliable over 10psi. There is a solution to the solenoid situation with using better ones.
The achilles heel of the sequential system is all the vac hoses, chambers, solenoids, actuators and check valves. The OEM parts were never designed over 10 psi, and the sequential system is notoriously difficult to understand and fix. It's also hard to get to crammed mostly under the UIM. This is why most people go single turbo.
I'm hoping with the new solenoid setup I'll be able to eliminate the OEM problems of complicated vac hose setups and crappy solenoid problems. Check valves can be upgraded as well to viton.
We'll see what happens, can't hurt trying
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Adam- I think the main thing is the abraidable seals.
Pete- Can't wait to see the 2:08 video. Great example of the 99twins being used on track and working very well... along with a great driver.
And BTW Pete, what's your top speed on the back straight at VIR... 155-160ish? Geeeeez, That's plenty fast enough for top end
Pete- Can't wait to see the 2:08 video. Great example of the 99twins being used on track and working very well... along with a great driver.
And BTW Pete, what's your top speed on the back straight at VIR... 155-160ish? Geeeeez, That's plenty fast enough for top end
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I'm hitting 160 on the back straight and 155 on the front at VIR. My theory on '99's vs other upgrades (that are typically "larger", aimed at higher peak power) is that the "small" size is a better match for the rest of the system. Basically, most sequential systems are limited to maybe 385 hp @ 15 psi anyway due to the flow through the manifold. That being the case, you're better just going smaller and getting better spool and torque for similar limited top end power. Of course your results may vary with non-sequential operation, porting, or boost levels above 15 psi... which I wouldn't run on the track with any twin turbo system due to heat. At 12-13 psi, the '99's are hard to beat, and you can run 15 psi on the street, which again is about as high as I'd go on pump gas. I've been running '99's since '03 or so.
FWIW, I've been running the same factory sequential turbo control system for probably 8-9 years without repairing anything. I have the saxyman upgrade solonoids in a drawer, but until something fails, it's hard to "fix" it. One thing I DO have is a pressure regulator plumbed in after the pressure tank that ensures the 'noids never see more than 10 psi.
Anyway, that's my experience. I recognize that plenty of people have destroyed '99's and other TT's on track in much less time.
FWIW, I've been running the same factory sequential turbo control system for probably 8-9 years without repairing anything. I have the saxyman upgrade solonoids in a drawer, but until something fails, it's hard to "fix" it. One thing I DO have is a pressure regulator plumbed in after the pressure tank that ensures the 'noids never see more than 10 psi.
Anyway, that's my experience. I recognize that plenty of people have destroyed '99's and other TT's on track in much less time.
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PFS put it on my car years ago... I believe it was called "SpeedAir"... if you search for posts by me, there may be a few threads with more info from me on it, including a P/N, but I've forgotten it's been so long, and my car isn't at the house currently to check.
EDIT: This looks like the thread, but I never posted a part number, or it was in another thread that got removed. When I get the car back, I'll try to remember to post some info:
https://www.rx7club.com/showthread.p...gulator&page=3
Last edited by ptrhahn; 11-07-11 at 07:19 PM.
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I noticed the opposite when I went from the 93-95 turbos to the 99s. The spool up felt the same but my butt dyno noticed the torque had dropped most noticeably in the lower boost pressures. Up top they felt stronger abover 10psi though. My original turbos had 50K miles on them FWIW. I no longer have the link, but there was an Austrailian website that had some articles on it when the 99 model was released and two had mentioned how bottom-end torque was reduced. They even had a dyno spread that compared the old turbos to the newer ones.
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We have access to both the 92-94 "early turbos" and the later model Series 8 turbos here in Australia. I have 2 identical FDs, with a set of each fitted in the shop. I do notice more lag in the older design turbos, before they come onto boost.
I think I currently have 7 sets of Series 8 turbochargers (the ones with the abradable resin in the compressor housings) and 5 sets of the older style turbos, sitting on the rack. They are much of a muchness, apart from spool time being reduced in the newer style.
My Dad's car has some weird ones- it has a set of sequential Knight Sport turbochargers. They have a polished alloy finish on the compressor housings, and "KNIGHTSPORT" cast around the compressor housings in raised letters. We dont know much about them, but he pulled them apart and balanced/blueprinted them, and that car absolutely rockets. I've been in a 400hp FD before, and his car is much quicker. Its smoking clutches and spinning wheels in 4th gear. Granted yeah, he did spend a lot of time rebuilding the motor, but I think a lot of it is due to the knightsports turbos he's using.
I think I currently have 7 sets of Series 8 turbochargers (the ones with the abradable resin in the compressor housings) and 5 sets of the older style turbos, sitting on the rack. They are much of a muchness, apart from spool time being reduced in the newer style.
My Dad's car has some weird ones- it has a set of sequential Knight Sport turbochargers. They have a polished alloy finish on the compressor housings, and "KNIGHTSPORT" cast around the compressor housings in raised letters. We dont know much about them, but he pulled them apart and balanced/blueprinted them, and that car absolutely rockets. I've been in a 400hp FD before, and his car is much quicker. Its smoking clutches and spinning wheels in 4th gear. Granted yeah, he did spend a lot of time rebuilding the motor, but I think a lot of it is due to the knightsports turbos he's using.
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Is the spool really that much slower than the stock/99 twins? Seems to be varying opinions between this and other threads.
What about the Knightsports twins, anyone have those? Not much information, they seem to spool fast, but are prone to failure, is that accurate?
What about the Knightsports twins, anyone have those? Not much information, they seem to spool fast, but are prone to failure, is that accurate?
#25
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Is the spool really that much slower than the stock/99 twins? Seems to be varying opinions between this and other threads.
What about the Knightsports twins, anyone have those? Not much information, they seem to spool fast, but are prone to failure, is that accurate?
What about the Knightsports twins, anyone have those? Not much information, they seem to spool fast, but are prone to failure, is that accurate?
No experience with the Knightsports. I remember them from several years ago, and remember a few members having them, but not much else. Seems like Carol(Imstillonjava) had a set maybe? Not sure if she ever had them installed though.
One other element that really hasn't been brought up in this discussion(and is a big one IMO) is we all know Bryan@BNR. We know his turbo's and how well they work. We know he does good work and if you have an issue with his turbo's, you can give him a call or shoot him an email and have great technical/customer support. That's worth alot.