Rx8 maxing out at 107 mph
#1
Rx8 maxing out at 107 mph
My rx8 is basically maxing out in 4th gear... I bought an rx8 and wanted to get a feel for it. I can redline up to 9000rpms in first, second and third gear, but then 4th gear it stops at 7000rpms and im sitting at 100-101 mph for multiple seconds, it never passed that line, then when i **** to try 5th gear it climbs to about 107mph slowly and thats it... 6th gear is basically OD and a **** show anyways considering its not pulling at 5th. Please let me know if this can be fixed or a common problem. I thought it could possibly be the governor,.. but why at 107mph....
#2
Registered
iTrader: (1)
That doesn't sound right. Since you're new to RX8s, there are some common things you need to get on top of:
- replace ignition coils if older than 30,000mi
- replace spark plugs if older than same
- check that the cat is not clogged
- do a compression test to assess the health of the motor
Full thread here: https://www.rx8club.com/rx-8-discuss...t-here-202454/
- replace ignition coils if older than 30,000mi
- replace spark plugs if older than same
- check that the cat is not clogged
- do a compression test to assess the health of the motor
Full thread here: https://www.rx8club.com/rx-8-discuss...t-here-202454/
#3
SARX Legend
iTrader: (46)
Are you towing a boat when doing this? If not then there could be many mechanical issues that would limit power/speed. Also, be careful about illegal driving/street racing posts, they are forbidden here.
#4
Registered
iTrader: (4)
There isn't a governor on a RX8. Top speed is aero limited on a manual transmission car to around 150 mph. And, electronically limited on a automatic to 125 mph.
I would think the first place to look would be the ignition system. Also possibly a clogged catalytic converter.
I would think the first place to look would be the ignition system. Also possibly a clogged catalytic converter.
#5
I replaced ignition coils, spark plugs battery and starter when i got. I am not towing a boat lol. Also yesi have engine codes about the catalytic converter, but I thought it was due to bad emissions.. How does that effect the driving other than gas mileage?
#8
As I understand it, a clogged CAT does not allow all your exhaust gases to escape and exit the tail pipe. As a result it is causing a bottle neck and backing up into your motor, which is not good. It is less than ideal in a piston engine, it is a death sentence to a rotary. I would stop driving it until I get it replaced. If you do a search, you can find multiple posts discussing this issue.
edited to add: All the above that beat me to it lol
#10
Registered
No you cannot just clean it and have a working cat.
Your options are to gut it and don't replace it(wont pass emissions...), buy a aftermarket cat and have it welded in place(search, there are not many good replacements), buy a new cat pipe from mazda, or buy a midpipe and stay catless. As someone else said, do not keep driving the car as-is. You could turn a $200-1300 problem into several thousand if you kill the engine.
Depending on your state you may be able to pass without a cat on the car, if it is only the obd2 test then its possible. If they do the sniffer test then you need to get a working cat on there.
Your options are to gut it and don't replace it(wont pass emissions...), buy a aftermarket cat and have it welded in place(search, there are not many good replacements), buy a new cat pipe from mazda, or buy a midpipe and stay catless. As someone else said, do not keep driving the car as-is. You could turn a $200-1300 problem into several thousand if you kill the engine.
Depending on your state you may be able to pass without a cat on the car, if it is only the obd2 test then its possible. If they do the sniffer test then you need to get a working cat on there.
#11
Alright thanks for all of your help. I am going to gut it out first then if I'm not satisfied I'll just buy a new one. The one last thing i want to make sure is though, is can the cat really take 40mph off my car, or would there be other things involved?
#12
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Originally Posted by alnielsen
There isn't a governor on a RX8. Top speed is aero limited on a manual transmission car to around 150 mph. And, electronically limited on a automatic to 125 mph.
I would think the first place to look would be the ignition system. Also possibly a clogged catalytic converter.
I would think the first place to look would be the ignition system. Also possibly a clogged catalytic converter.
Posted From RX8Club.com Android App
#14
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Join Date: Jul 2012
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P.S. My exhaust smoked a lot for the first few minutes after startup with my cat-delete, don't be too alarmed if yours does the same. Leftover carbon and what not.
#15
I dont think its been mentioned but do you have a JDM spec 8 as they are limited to around 170km/h or 107 mph, the engine will just stop accelerating, my first 8 was like this.
#16
Hmm I have a similar issue, mine stops accelerating around 120mph (Manual)
I think I need to replace my coils as I replaced the plugs and wires not to long ago, did not have the money at the time to do the coils ^-^
Any advantage with BHR or will OEM suffice? I know BHR is amazing, top quality, will last longer, ect.. but for 500$ vs 84$ Is it worth it, for a normal street driven RX8?
I think I need to replace my coils as I replaced the plugs and wires not to long ago, did not have the money at the time to do the coils ^-^
Any advantage with BHR or will OEM suffice? I know BHR is amazing, top quality, will last longer, ect.. but for 500$ vs 84$ Is it worth it, for a normal street driven RX8?
#17
Registered
BHR is better, but if money is an issue then just go with the aftermarket coils. There is also at least 1 DIY on how to make your own ls2 coil upgrade which would save you money if you wanted to go that route.
#18
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iTrader: (1)
Hmm I have a similar issue, mine stops accelerating around 120mph (Manual)
I think I need to replace my coils as I replaced the plugs and wires not to long ago, did not have the money at the time to do the coils ^-^
Any advantage with BHR or will OEM suffice? I know BHR is amazing, top quality, will last longer, ect.. but for 500$ vs 84$ Is it worth it, for a normal street driven RX8?
I think I need to replace my coils as I replaced the plugs and wires not to long ago, did not have the money at the time to do the coils ^-^
Any advantage with BHR or will OEM suffice? I know BHR is amazing, top quality, will last longer, ect.. but for 500$ vs 84$ Is it worth it, for a normal street driven RX8?
#20
Mr. Örange
Could it be an oil issue? Could your engine rev limit you because of improper oil intake, either it's not getting proper flow, or you don't have enough oil? I wouldn't let the oil drop below the second hash mark (1 quart low,) especially if you are really pushing the car. I know there is another pint to go before you hit the add mark, but I think that is too low.
#21
You should find out where your car came from. I know the overseas 8s are less powered and limited on everything. So sounds like you might have one from overseas somewhere. I do not think a clogged cat or bad plugs or coils would cause this but I am no expert so dont take my word for it. I got my 05 8 to 164 before some jerk cut me off ( on the track) no street racing here no worries.
#25
Still happening
i have a punched out cat, the only code is a cat code and I already did coils and plugs and it still cuts power at 107mph until I let off the gas and go back on it