Turbo RX8
06-01-2006, 02:16 AM
#21
Senior Member
Join Date: Aug 2004
Posts: 426
if the 6 port weren't blown, i'd trade you. i've got the harness, ecu, manifolds, etc...
i think the 4 port is gonna get on with boost a little better than the 6 ports. the 6pi is great for na's, but not needed once you start shoving air in there on its own.
i think the 4 port is gonna get on with boost a little better than the 6 ports. the 6pi is great for na's, but not needed once you start shoving air in there on its own.
06-03-2006, 11:28 PM
#24
Junior Member
Join Date: Nov 2003
Posts: 3
Check out this months Car and Driver magazine July 2006, complete turbo coverage on the Protech system for the RX8.
I want forced induction so badd for my car, but don't know where to start.
Originally Posted by 321dyno' post='817833' date='May 7 2006, 01:44 PM
I want forced induction so badd for my car, but don't know where to start.
06-04-2006, 06:37 PM
#25
Member
Join Date: Apr 2006
Posts: 83
The GReddy computer doesnt have anyway to control the fuel pumps in the rx8 so changing the fuel maps doesnt fix everything. At certain rpms and certain throttle position with the right load there may still be fuel starvation problems because fuel pumps are still running like they would with a stock tune. Fuel pressure fluctuates with stock set up. The Mazsport Interceptor allows you to fix this problem, so tunning is much more acurate. With the Interceptor, in my opinion, you still need an air temp sensor and a wideband o2 sensor, both specifically calibrated for the Interceptor. This will cost about $1000+ from Mazsport on top of the cost of the Interceptor. You may want to also do something to modify the fuel pick up because hard cornering with much less than half a tank may cause fuel starvation problems too.
The turbo in the GReddy kit isnt big enough to hold more than 5 or 6 psi at redline, so no matter what you set the boost for, it will fall off up high. Mazsport is in the process of designing their own turbo kit i believe.
Rx8s have overheating problems so no matter what you do, the first upgrade should be either vented hood or radiator relocation, so hot air has a way to leave the engine bay. Aftermarket radiator will help too, but without a way for air to escape that wont be enough. Vented hoods seem to be the cheapest way to help with this problem, radiator relocation is most likely alittle better, but i think a vented hood usually does the trick.
The renesis will hold up to boost if its tuned correctly.
I would also get urethane engine mounts, or even solid mounts before you add much power to the cars, or even drive them hard in stock form. The stock liquid mounts suck really really bad and when they go bad your lower intake manifold will crack from hitting the subframe. Vibrations are almost non existant even with solid mounts, i have no idea why ford/mazda felt that liquid mounts were a good idea. Your whole drivetrain will last longer with harder mounts, soft mounts put alot of unnecessary stress on everything.
If you want a reliable car that you can beat on like it was stock, then dont try to turbocharge an Rx8 without about $10,000 to throw down on all the stuff mentioned above. You may have to have engine mounts custom made, if you go solid you also may need engine mount brackets made because the stock ones are just cast aluminum and they will crack and break with time, but someone may already make something, i dont know. If you are going to have custom mounts made, then you should know the subframe is about 3 degrees from level and that 3 degrees faces away from the engine on either side. I believe this angle has to be compensated for in the top of the engine mounts or the engine mount brakets wont sit correctly. Anyway, I have gathered this info from working on the cars myself and talking to some of the people making parts for the rx8 so i am 99% sure its all good info.
The turbo in the GReddy kit isnt big enough to hold more than 5 or 6 psi at redline, so no matter what you set the boost for, it will fall off up high. Mazsport is in the process of designing their own turbo kit i believe.
Rx8s have overheating problems so no matter what you do, the first upgrade should be either vented hood or radiator relocation, so hot air has a way to leave the engine bay. Aftermarket radiator will help too, but without a way for air to escape that wont be enough. Vented hoods seem to be the cheapest way to help with this problem, radiator relocation is most likely alittle better, but i think a vented hood usually does the trick.
The renesis will hold up to boost if its tuned correctly.
I would also get urethane engine mounts, or even solid mounts before you add much power to the cars, or even drive them hard in stock form. The stock liquid mounts suck really really bad and when they go bad your lower intake manifold will crack from hitting the subframe. Vibrations are almost non existant even with solid mounts, i have no idea why ford/mazda felt that liquid mounts were a good idea. Your whole drivetrain will last longer with harder mounts, soft mounts put alot of unnecessary stress on everything.
If you want a reliable car that you can beat on like it was stock, then dont try to turbocharge an Rx8 without about $10,000 to throw down on all the stuff mentioned above. You may have to have engine mounts custom made, if you go solid you also may need engine mount brackets made because the stock ones are just cast aluminum and they will crack and break with time, but someone may already make something, i dont know. If you are going to have custom mounts made, then you should know the subframe is about 3 degrees from level and that 3 degrees faces away from the engine on either side. I believe this angle has to be compensated for in the top of the engine mounts or the engine mount brakets wont sit correctly. Anyway, I have gathered this info from working on the cars myself and talking to some of the people making parts for the rx8 so i am 99% sure its all good info.
06-05-2006, 10:04 AM
#26
Senior Member
Join Date: Aug 2004
Posts: 426
just since i'm getting another renny motor with the interceptor, i'll use it. it's nice to have a little extra control, but at the end of the day, it's still a microtech, and has the typical microtech limitations.
but the other renny gets an fc front cover and a haltech e8.
but the other renny gets an fc front cover and a haltech e8.
06-06-2006, 07:43 AM
#27
Member
Join Date: Apr 2006
Posts: 83
The microtech isnt too limited, the only thing i can see that really matters is when tuning by load you cant tune the ignition as well as you can fuel. Ignition can only be tuned the "user friendly" way. But most people dont have access to a dyno that will allow them to tune for load anyway. I havent had much experience with haltech, how much more capable is it? Just curious.
The nice thing about the Interceptor is that you can still keep the stock TB and stock steering rack. Personally i dont like the feel of the steering much and would like just a damn manual rack on everything i drive. But the interceptor does keep things very simple. Its not perfect though.
The nice thing about the Interceptor is that you can still keep the stock TB and stock steering rack. Personally i dont like the feel of the steering much and would like just a damn manual rack on everything i drive. But the interceptor does keep things very simple. Its not perfect though.
06-07-2006, 08:03 AM
#29
Member
Join Date: Apr 2006
Posts: 83
i guess maybe the haltech lets you play with when and how injectors come on instead of just letting you play with overall amounts of fuel?
I'll take a look at the software, i think i might be looking for fuel management for my 7 sometime in the near future.
I'll take a look at the software, i think i might be looking for fuel management for my 7 sometime in the near future.
06-19-2006, 04:58 PM
#30
Senior Member
Join Date: Aug 2004
Posts: 426
Originally Posted by wankelTII' post='822954' date='Jun 7 2006, 06:03 AM
i guess maybe the haltech lets you play with when and how injectors come on instead of just letting you play with overall amounts of fuel?
I'll take a look at the software, i think i might be looking for fuel management for my 7 sometime in the near future.
yea, it has a few different staging options. primary hold, duty cut, has extra load bars, etc etc... it's got a lot of control to it.
the one thing it doesn't have that i wish it did is staging load vs. rpm. it's load dependant, but not rpm. if it had that, i could stage at say 10 psi @ 3500 rpm, and 4 psi @ 5k rpm... stuff like that.