single turbo, stock port
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Junior Member
Joined: Aug 2010
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From: anaheim
single turbo, stock port
I just bought a 93' fd and want to know what kind of "reliable" power can be made with a single turbo conversion on a stock port motor. Also, what kind of power band should be expected? Thanks in advance for the help!
You can make as much power as you can afford.
Power band would depend on the turbo being used. Quick generalization: smaller turbo - you'll get boost around 3,000 RPM. bigger turbo - you'll get boost around 4,000 rpm.
Reliability would be a factor of choosing a good kit, getting all the supporting mods (fuel, cooling, clutch etc) and catching up with all deferred maintenance and replacing old parts like the wiring harness, all coolant hoses and clamps etc. The final piece of the reliability puzzle is good tuning - which is hard to find.
Good luck passing CA smog with a single turbo kit...
Here is a link to the 3rd gen FAQ thread. Read up on these topics:
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/faq-3rd-gen-other-useful-links-68640/
Thread Starter
Junior Member
Joined: Aug 2010
Posts: 6
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From: anaheim
Not sure yet, any suggestions? I'm trying to figure out if it's worth going to a single conversion without porting the motor. I've been told the powerband blows by doing so. Sorry, but SUPER noob to this rotary thing,lol
Thread Starter
Junior Member
Joined: Aug 2010
Posts: 6
Likes: 0
From: anaheim
You can make as much power as you can afford.
Power band would depend on the turbo being used. Quick generalization: smaller turbo - you'll get boost around 3,000 RPM. bigger turbo - you'll get boost around 4,000 rpm.
Reliability would be a factor of choosing a good kit, getting all the supporting mods (fuel, cooling, clutch etc) and catching up with all deferred maintenance and replacing old parts like the wiring harness, all coolant hoses and clamps etc. The final piece of the reliability puzzle is good tuning - which is hard to find.
Good luck passing CA smog with a single turbo kit...
Here is a link to the 3rd gen FAQ thread. Read up on these topics:
https://www.rx7club.com/showthread.php?t=68640
Power band would depend on the turbo being used. Quick generalization: smaller turbo - you'll get boost around 3,000 RPM. bigger turbo - you'll get boost around 4,000 rpm.
Reliability would be a factor of choosing a good kit, getting all the supporting mods (fuel, cooling, clutch etc) and catching up with all deferred maintenance and replacing old parts like the wiring harness, all coolant hoses and clamps etc. The final piece of the reliability puzzle is good tuning - which is hard to find.
Good luck passing CA smog with a single turbo kit...
Here is a link to the 3rd gen FAQ thread. Read up on these topics:
https://www.rx7club.com/showthread.php?t=68640
Yeah, the CA smog thing is certainly an issue. Ok, makes sense, its pretty much like boosting anything else. Thanks for the help
A hybrid turbo setup is also an option for someone looking for more power, but needing to make it appear stock. BNR can rebuild FD twins with GT28 wheels and CHRAs if you need to go incognito, but still want to squeeze some more power out of the car. http://bnrsupercars.com/
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Follow the link I gave, and go to the Mazda products section. I can't directly link since the site uses Ajax.
The BNR Stage 3's have the world record on most RWHP made off bolt up hybrid turbochargers for the RX7! 426 RWHP and 365 RWTQ was made at 18 psi of boost!
The Stage 3's have many improvements over the factory HT12 turbochargers. The factory HT12's are not rebuildable in most cases. The stage 3's however are not remanufactured turbochargers. They have new CHRA's (Center Housing Rotating Assemblies) and the factory end housings are machined to fit the new CHRA's. The stage 3's can be ran in sequential or non sequential forms. When sets are ordered, please include Y pipe for modifications. A one year warranty comes with each set of BNR Stage 3's. We do need your turbochargers on purchase. Here is what you get with a set of BNR Stage 3's.
*
GT28 CHRA's (Center Housing Rotating Assemblies)
*
360 degree thrust assemblies
*
VSR balanced to 140K RPM
*
CNC machined turbine and compressor housings
*
Ported wastegate and turbine housing entrence
*
Adjustable wastegate actautor
*
Both compressor and turbine wheels are upgraded
*
1 year warranty
The Stage 3's have many improvements over the factory HT12 turbochargers. The factory HT12's are not rebuildable in most cases. The stage 3's however are not remanufactured turbochargers. They have new CHRA's (Center Housing Rotating Assemblies) and the factory end housings are machined to fit the new CHRA's. The stage 3's can be ran in sequential or non sequential forms. When sets are ordered, please include Y pipe for modifications. A one year warranty comes with each set of BNR Stage 3's. We do need your turbochargers on purchase. Here is what you get with a set of BNR Stage 3's.
*
GT28 CHRA's (Center Housing Rotating Assemblies)
*
360 degree thrust assemblies
*
VSR balanced to 140K RPM
*
CNC machined turbine and compressor housings
*
Ported wastegate and turbine housing entrence
*
Adjustable wastegate actautor
*
Both compressor and turbine wheels are upgraded
*
1 year warranty
A local guy to NorCal made ~350 RWHP at ~14-15 PSI on a well built motor with a small port, 91 octane and good tuning using the BNR twins setup in sequential manner. Search for posts form rynberg in the 3rd gen section.
I'm just pulling this out of my *** but I've heard that street porting can add 10% or more to HP. It would obviously depend on how good the porting and rest of the motor is.
I made ~330 RWHP at 10 PSI on 99 twins on an old motor with a large street port, 91 octane and good tuning. Same motor and turbos put down 350 RWHP on 93 octane years before with the same tuner. These are on stock sequential setup (not non-sequential) so I have full 10 PSI of boost comes at ~2,500. Very quick spooling, fun setup.
The FAQ thread has details on supporting mods required for different power levels.
I'm just pulling this out of my *** but I've heard that street porting can add 10% or more to HP. It would obviously depend on how good the porting and rest of the motor is.
I made ~330 RWHP at 10 PSI on 99 twins on an old motor with a large street port, 91 octane and good tuning. Same motor and turbos put down 350 RWHP on 93 octane years before with the same tuner. These are on stock sequential setup (not non-sequential) so I have full 10 PSI of boost comes at ~2,500. Very quick spooling, fun setup.
The FAQ thread has details on supporting mods required for different power levels.
Last edited by gracer7-rx7; Aug 20, 2010 at 04:00 PM. Reason: added: using the BNR twins setup in sequential manner
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