Dual or single exhaust
Good post, but the RB is rather huge as it is. The mouth of the inlet had to be deformed so that it could actually bolt on to an FC turbine housing. How much bigger can you go without going V-band/full turbo?
The RB system is RESTRICTIVE.
I know the RB system since I have it on my car now. I know they Oakie rigged the downpipe inlet by crushing it where it welds to the turbo flange. I know how hard it is to bolt to the turbo because of this.
The CORRECT way to do it is the way my JIC 3 1/2" downpipe was built. A reverse velocity stack for good gas expansion from the smaller turbo outlet to the bigger downpipe and the added benifit of plenty of room to move your box end wrench on the nuts.
RB also has more Oakie rigged features like 3 cheated radius cuts/welds instead of better flowing mandrel bends through out and thin downpipe tubing and too thick heavy y-pipe tubing so the exhaust is heavy with NO benifits.
Before the RB I had the JIC Spec 90 3 1/2" turbo back and it had MUCH better low end power faster boost response and lower rpm full boost by ~500rpm. I could cruise at ~1,000rpm in 5th and pull from that smoothly. With RB I couldn't cruise under 1,500rpm as it will jerk if I try to accelerate.
The restriction of the RB did cure my boost creep issues though as it couldn't flow as much on the top end either.
It is nice the RB is so quiet, but you can get that without restriction- look at the old Knighsports turbo dual system that split into dual 3" exhaust RIGHT off the turbo. It had 4 presilencers and 2 mufflers recieving half the exhaust energy each! Quiet and good flow...
The RB system is RESTRICTIVE.
I know the RB system since I have it on my car now. I know they Oakie rigged the downpipe inlet by crushing it where it welds to the turbo flange. I know how hard it is to bolt to the turbo because of this.
The CORRECT way to do it is the way my JIC 3 1/2" downpipe was built. A reverse velocity stack for good gas expansion from the smaller turbo outlet to the bigger downpipe and the added benifit of plenty of room to move your box end wrench on the nuts.
RB also has more Oakie rigged features like 3 cheated radius cuts/welds instead of better flowing mandrel bends through out and thin downpipe tubing and too thick heavy y-pipe tubing so the exhaust is heavy with NO benifits.
Before the RB I had the JIC Spec 90 3 1/2" turbo back and it had MUCH better low end power faster boost response and lower rpm full boost by ~500rpm. I could cruise at ~1,000rpm in 5th and pull from that smoothly. With RB I couldn't cruise under 1,500rpm as it will jerk if I try to accelerate.
The restriction of the RB did cure my boost creep issues though as it couldn't flow as much on the top end either.
It is nice the RB is so quiet, but you can get that without restriction- look at the old Knighsports turbo dual system that split into dual 3" exhaust RIGHT off the turbo. It had 4 presilencers and 2 mufflers recieving half the exhaust energy each! Quiet and good flow...
Last edited by BLUE TII; Oct 20, 2005 at 05:45 PM.
Oh how I love supercharging. Boost response is not dependent on pull-over gradient.
Are you loving it yet? I have been eagerly awaiting an update on your awsome project and a report on the boost patterns.
Well, even with the very quiet RB restrictive system I still was getting some boost ~2,000rpm, ~8psi by ~2,500rpm and full 17psi by 4,000rpm to redline (8,000rpm)
YOU know how big a Lysolm it would take for 17psi from 4,000rpm to redline on a big ported 13B! Can't afford that can we
Are you loving it yet? I have been eagerly awaiting an update on your awsome project and a report on the boost patterns.
Well, even with the very quiet RB restrictive system I still was getting some boost ~2,000rpm, ~8psi by ~2,500rpm and full 17psi by 4,000rpm to redline (8,000rpm)
YOU know how big a Lysolm it would take for 17psi from 4,000rpm to redline on a big ported 13B! Can't afford that can we
Play Well
Joined: Feb 2005
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From: We're all fine here now, thank you. How are you?
One word FLOWMASTER. JK they sound like poo on a fc at least. I think I am gonna run a Apexi dual system on my car. I heard from somone that it isnt that loud. I have a vid of a fc with it. Didnt GReddy used to make a dual system. If they did I think I have a video of one of them to. I was compair exhaust for a long time and even though it may sound ricer of me I like the canister exhausts. The RB is good but it just isnt my cup of tea. Plus its way expensive. Well at least with RB you know that your getting your moneys worth in reliability.
Alex Saunders
Alex Saunders
I'm a boost creep...
Joined: Jan 2002
Posts: 15,608
Likes: 8
From: Auckland, New Zealand
BLUE TII, I know you have some issues with how the RB exhaust is built, but do you think some of the performance difference between it and the JIC system might be because of the rather significant 25% difference in pipe internal area? 
BLUE TII, I know you have some issues with how the RB exhaust is built, but do you think some of the performance difference between it and the JIC system might be because of the rather significant 25% difference in pipe internal area?
Definitely! I was trying to illustrate that larger than RB system is better in response to this post
Good post, but the RB is rather huge as it is. The mouth of the inlet had to be deformed so that it could actually bolt on to an FC turbine housing. How much bigger can you go without going V-band/full turbo?
It is sad that a made in China $400 Ebay "knock off" of the RB system is better quality at 1/2 the price (check group buy section). Made in America used to be a good thing but the conservative nationalistic dogma of "buy American" meant the brainwashed masses would buy American even when the quality dropped to crap
Definitely! I was trying to illustrate that larger than RB system is better in response to this post
Good post, but the RB is rather huge as it is. The mouth of the inlet had to be deformed so that it could actually bolt on to an FC turbine housing. How much bigger can you go without going V-band/full turbo?
It is sad that a made in China $400 Ebay "knock off" of the RB system is better quality at 1/2 the price (check group buy section). Made in America used to be a good thing but the conservative nationalistic dogma of "buy American" meant the brainwashed masses would buy American even when the quality dropped to crap
Full Member
Joined: Aug 2004
Posts: 136
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From: Hudson, Florida
Originally Posted by BLUE TII
[It is sad that a made in China $400 Ebay "knock off" of the RB system is better quality at 1/2 the price (check group buy section). Made in America used to be a good thing but the conservative nationalistic dogma of "buy American" meant the brainwashed masses would buy American even when the quality dropped to crap
That system is still american, made in the heart of north carolina.
R.J.
Originally Posted by fcdrifter13
One word FLOWMASTER. JK they sound like poo on a fc at least. I think I am gonna run a Apexi dual system on my car. I heard from somone that it isnt that loud. I have a vid of a fc with it. Didnt GReddy used to make a dual system. If they did I think I have a video of one of them to. I was compair exhaust for a long time and even though it may sound ricer of me I like the canister exhausts. The RB is good but it just isnt my cup of tea. Plus its way expensive. Well at least with RB you know that your getting your moneys worth in reliability.
Alex Saunders
Alex Saunders
Apexi's are usually only $50-$75 less then a RB system.
The Greddy cat-back is around $800 last I checked!
Thread Starter
No money. No love.
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From: SACRAMENTO
Originally Posted by Jager
Apexi's are usually only $50-$75 less then a RB system.
The Greddy cat-back is around $800 last I checked!
The Greddy cat-back is around $800 last I checked!
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