high revs
08-15-10, 01:34 AM
#2
do not exceed the indicated maximum rpm's for your engine. 86-88 is 7K rpm and 89-91 is 8K rpm. any higher and you risk leaving chatter marks on your housings from wiggling apex seals and you run the risk of stationary gear failure. you do not make power above 7K rpm or 8K rpm (model year depending) so its actually a waste to exceed the redline.
08-15-10, 10:35 AM
#4
Engine, Not Motor
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And to answer the second half of the question, building an engine that will rev to 10K requires balancing of the rotating assembly, lightening of the rotors if you want it to be reliable, oiling mods and hardened stationary gears. Of course, the stock porting and manifolds won't breath at that RPM anyway.
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08-15-10, 03:08 PM
#8
Kirei ni hyō*ryū* iku!
There's no rev limiter on the S4 just an annoying beeping sound once you redline at 7k rpm. That's obviously the cars way of telling you to well.. Shift. Performance wise, if you wanna accelerate and shift well (in a non turbo) I've figured out it's best to **** into second right at 30 mph, into third around 60 mph, fourth gear around 85 mph, and fifth gear around 110 mph. Hope that helps any.
Last edited by a_cradier; 08-15-10 at 03:09 PM. Reason: typo
08-15-10, 08:18 PM
#10
Kirei ni hyō*ryū* iku!
08-15-10, 09:14 PM
#11
if there were a rev limiter on an S4 (never took the engine past 7000 rpm), it would prevent you from revving the engine to 8000-8500 rpm on the high side. since the tachometer only reads to an indicated 8000rpm, there is no way to find 8500 on an S4 and doing so is just risky business. revving to 8000-8500 rpm can cause apex seal or stationary gear failure if done on a regular basis. on an older engine, 8500 rpm can mean certain death.
08-15-10, 10:39 PM
#15
There is definitely a rev limiter on FCs. At around ~7800 on my FC (S4 n/a), there is a very abrupt "I just hit a brick wall" lapse in acceleration, usually accompanied by a large backfire.
Although, with the age of these cars and the known electrical problems, it would not surprise me to learn that the rev limiter has somehow stopped working on some cars. Just like how some cars have clocks and idiot lights that don't work right, wiper switches that don't work right, etc.
Although, with the age of these cars and the known electrical problems, it would not surprise me to learn that the rev limiter has somehow stopped working on some cars. Just like how some cars have clocks and idiot lights that don't work right, wiper switches that don't work right, etc.
08-15-10, 11:42 PM
#16
There is definitely a rev limiter on FCs. At around ~7800 on my FC (S4 n/a), there is a very abrupt "I just hit a brick wall" lapse in acceleration, usually accompanied by a large backfire.
Although, with the age of these cars and the known electrical problems, it would not surprise me to learn that the rev limiter has somehow stopped working on some cars. Just like how some cars have clocks and idiot lights that don't work right, wiper switches that don't work right, etc.
Although, with the age of these cars and the known electrical problems, it would not surprise me to learn that the rev limiter has somehow stopped working on some cars. Just like how some cars have clocks and idiot lights that don't work right, wiper switches that don't work right, etc.
08-16-10, 12:25 PM
#18
'87 TII rx7
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i can take mine to 7500 since thats where fuel cut is..(had my ports open up a little bit more since im running a full RB exhaust system(NO CATS OR AIR PUMP)
08-16-10, 01:47 PM
#19
Rotary Enthusiast
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back when i blew my coolant seals and wanted to have the motor catastrophically fail(which it wouldnt do at all) i had the needle just stop moving at around 8.. pretty sure it went higher than that
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