sequential TT OR SINGLE
sequential TT OR SINGLE
04-22-02, 07:58 PM
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Stay with a sequential system, there is a reason why mazda put one in there in the first place, and if you do decide that you want turbos that produce more horsepower than the stock which produce at there peak 400 hp, then go with two t-66 turbos on each side of that rotary and then you will be ****** flying bro!!!!!
04-22-02, 08:06 PM
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You can get good power with either of them. If you don't go overboard and get a huge turbo (T-88 or something) the difference in lag will be small. Examples are the Apex RX-6, XS T04S or T04E, and I understand the Greddy T-78 has acceptable lag and has the most power capability of these.
I think there are two main questions that determine what to do. First, if you go single that will cause problems if you need to get your car smogged. If you don't mind switching back to get it smogged or live somewhere where you don't need to smog, go single. It's so much more simpler. One exception I *think* is HKS- they may have a street legal single. Seems like I remember them discontinuing it though.
Second, if you do to single, to decide which turbo to get you should think about what boost levels you are going to run, which is determined by what kind of gas you will use. If you use pump gas that will limit you to maybe 15psi, so there's no point in getting a T-78 that works well at 20+psi.
You'll also have more turbos to choose from if you go single. The only twins that are ready-made for the FD are M2's and I think Pettit & PFS also have upgraded twins (there might be a couple other places).
Basically, I'm partial to the single- I just put one on my car a couple months ago and I really like it. If you don't want to deal with smog issues, then upgraded twins would probably be best for you.
I think there are two main questions that determine what to do. First, if you go single that will cause problems if you need to get your car smogged. If you don't mind switching back to get it smogged or live somewhere where you don't need to smog, go single. It's so much more simpler. One exception I *think* is HKS- they may have a street legal single. Seems like I remember them discontinuing it though.
Second, if you do to single, to decide which turbo to get you should think about what boost levels you are going to run, which is determined by what kind of gas you will use. If you use pump gas that will limit you to maybe 15psi, so there's no point in getting a T-78 that works well at 20+psi.
You'll also have more turbos to choose from if you go single. The only twins that are ready-made for the FD are M2's and I think Pettit & PFS also have upgraded twins (there might be a couple other places).
Basically, I'm partial to the single- I just put one on my car a couple months ago and I really like it. If you don't want to deal with smog issues, then upgraded twins would probably be best for you.
04-22-02, 08:14 PM
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Originally posted by RotaryRockeTT
Stay with a sequential system, there is a reason why mazda put one in there in the first place, and if you do decide that you want turbos that produce more horsepower than the stock which produce at there peak 400 hp, then go with two t-66 turbos on each side of that rotary and then you will be ****** flying bro!!!!!
Stay with a sequential system, there is a reason why mazda put one in there in the first place, and if you do decide that you want turbos that produce more horsepower than the stock which produce at there peak 400 hp, then go with two t-66 turbos on each side of that rotary and then you will be ****** flying bro!!!!!
I wonder how you get enough boost for the Twin T-66
04-22-02, 08:35 PM
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What does single or twin have o do with smog? I see no relation. Please inform.
I just rode in an Apexi RX6 single turbo, and it was badass.... it didn't feel like and RX-7 though.
He had a lot more power on tap at all RPMs then my car, which is stock turbos with DP and intake.
He had RX6, full exhaust, intake, and really that is it, he did't even have an intercooler, and was running 14 psi.
Sequential will give better overall performance in theory. The problem is, in order to really get that performance you will need custom twins, and will probably end up spending around $5,000 to $8,000.
The jury is still out on the M2 twins, so I dunno, maybe they are badass and I just don't know it.
The other issue though is realiability and simplicity. Single turbo is way more reliable and simple, and will save weight over twins.
It feels different though, and I kinda think that twin turbos is part of what makes and RX-7 and RX-7.
Its a complicated issue for sure.
Single has many benefits.
Here are the facts as I see them:
Pro Single:
1) There are single systems that make more power across the powerband then stock twins.
2) Single can give a more steady build of power then stock twins.
3) Single is more relaible then stock twins.
4) Single saves weight over stock twins.
5) Single is easier to maintain then stock twins.
Pro Sequential:
1) RX-7s are meant to be sequential turbo cars. (this isn't really a fact I guess)
2) Sequential turbos can eliminate turbo lag and give more bottom end then a comperable single turbo system.
Thats about it.
The deal is that a COMPERABLE sequential turbo system will be better then its Single Turbo version in terms of performance, BUT and this is what gets people, THERE IS NO OFF THE SHELF SEQUENTIAL SYSTEM OUT THAT IS COMPERABLE TO THE SINGLE SYSTEMS THAT ARE OFFERED!
That is the deal. And if you find a sequential system that is comperable to a system like the RX-6 or T-88, or T-78, then it would cost you almost twice as much, or maybe more then twice as much, plus be harder to install and maintain.
The only real option is the M2 twins, BUT, do you really want to strap those on for the long haul?
The dela is, the single systems are major systems that are suported by big companies that run these same turbo on other cars, from Hondas to Toyotas to even GMs and Fords in some cases. These turbos will be supported for a long time. The RX-7 is 10 years old now, can I rely on M2s workmanship and support for the loing haul? I dunno.
The Pettit systems are not comperable to the single systems IMO, they are just stock tubros with clipped blades basically, well maybe not, but still they are essentially stock twins that have been tuned. They still have all the problems that stock twins have and will still go bad every 80,000 to 100,000 miles or so, if not earlier.
If I were a tuner shop and knew how to build my own sequential system and hd to resources and time, sure, I would do that, but I'm not and I don't have the money or time, or knowledge to build a sequential system.
I still don't know what I will do when the day comes to replace my turbos. I'm guesing that I will probably go with a single. I want to run around 400 HP, but I also want to autocross my car still, and want low end power. I know the Apexi RX6 is good for low end power, more low end the the stock twins, so that is a strong option for me.
I just rode in an Apexi RX6 single turbo, and it was badass.... it didn't feel like and RX-7 though.
He had a lot more power on tap at all RPMs then my car, which is stock turbos with DP and intake.
He had RX6, full exhaust, intake, and really that is it, he did't even have an intercooler, and was running 14 psi.
Sequential will give better overall performance in theory. The problem is, in order to really get that performance you will need custom twins, and will probably end up spending around $5,000 to $8,000.
The jury is still out on the M2 twins, so I dunno, maybe they are badass and I just don't know it.
The other issue though is realiability and simplicity. Single turbo is way more reliable and simple, and will save weight over twins.
It feels different though, and I kinda think that twin turbos is part of what makes and RX-7 and RX-7.
Its a complicated issue for sure.
Single has many benefits.
Here are the facts as I see them:
Pro Single:
1) There are single systems that make more power across the powerband then stock twins.
2) Single can give a more steady build of power then stock twins.
3) Single is more relaible then stock twins.
4) Single saves weight over stock twins.
5) Single is easier to maintain then stock twins.
Pro Sequential:
1) RX-7s are meant to be sequential turbo cars. (this isn't really a fact I guess)
2) Sequential turbos can eliminate turbo lag and give more bottom end then a comperable single turbo system.
Thats about it.
The deal is that a COMPERABLE sequential turbo system will be better then its Single Turbo version in terms of performance, BUT and this is what gets people, THERE IS NO OFF THE SHELF SEQUENTIAL SYSTEM OUT THAT IS COMPERABLE TO THE SINGLE SYSTEMS THAT ARE OFFERED!
That is the deal. And if you find a sequential system that is comperable to a system like the RX-6 or T-88, or T-78, then it would cost you almost twice as much, or maybe more then twice as much, plus be harder to install and maintain.
The only real option is the M2 twins, BUT, do you really want to strap those on for the long haul?
The dela is, the single systems are major systems that are suported by big companies that run these same turbo on other cars, from Hondas to Toyotas to even GMs and Fords in some cases. These turbos will be supported for a long time. The RX-7 is 10 years old now, can I rely on M2s workmanship and support for the loing haul? I dunno.
The Pettit systems are not comperable to the single systems IMO, they are just stock tubros with clipped blades basically, well maybe not, but still they are essentially stock twins that have been tuned. They still have all the problems that stock twins have and will still go bad every 80,000 to 100,000 miles or so, if not earlier.
If I were a tuner shop and knew how to build my own sequential system and hd to resources and time, sure, I would do that, but I'm not and I don't have the money or time, or knowledge to build a sequential system.
I still don't know what I will do when the day comes to replace my turbos. I'm guesing that I will probably go with a single. I want to run around 400 HP, but I also want to autocross my car still, and want low end power. I know the Apexi RX6 is good for low end power, more low end the the stock twins, so that is a strong option for me.
Last edited by Malachi151; 04-22-02 at 08:43 PM.
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04-23-02, 11:05 AM
#8
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Originally posted by MaxRX7
the Apexi single turbo will blow your mind !!!
if you want a bunch of power and don't mind lag, get a BIG single.
the Apexi single turbo will blow your mind !!!
if you want a bunch of power and don't mind lag, get a BIG single.
04-23-02, 05:33 PM
#10
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kel are you running non seq now. if so give me call, i want to feel the difference. before putting my car on the road i want to go non seq. just want to know if its worth it while i save for a single.
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