91 NA how to get rid of the 8600 RPM fuel CUT???
#1
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91 NA how to get rid of the 8600 RPM fuel CUT???
i ported the engine and it seem sto pull all the way to 8500 and then i hit fuel cut, how can i get rid of this without goign haltech or some other expensive aftermarket system
#4
rotary engines should be reved past that but some sites have that fuel cut removal. also. u can get a chipped ecu that will remove that and give u no rev limit, but like ted said, its a huge risk that your taking. there has to be a reason why the rev limit only reaches 8600.
i purchased a shipped ECU and i am scared to put it in. one slip on gear will definately have me on foot.
i purchased a shipped ECU and i am scared to put it in. one slip on gear will definately have me on foot.
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i dotn think its that easy, the flywheel doesnt come off that easy. does everyoen torque them properly to ~380 lbs liek the manual says? and i woudl get a scatter shield anyway
#7
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Is this some kinda race car?  If not, you need to beef up the bearings and raise the oil pressure to get the engine to run reliably up in that kinda RPM ranges.
-Ted
-Ted
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#8
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i only wanna rev to 9k thast all, i am nto planning to go in to crazy high rpm, and i think 9k is nto that big of a deal anyway. its nto a race car, hi sis my daily drive that will be taken to road races when weatehr permitts.
#9
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The engine has vibration issues at 8,500RPM.  No reason to rev past that, unless you're asking for trouble.  It's a big risk (and a waste of money) you're taking just to brag you can rev that high...
-Ted
-Ted
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Strange, I would have thought that when you took a 91 na, to 8,600, wouldent it hit rev limiter and not fuel cut.............am I right?
#13
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Originally posted by RETed
The engine has vibration issues at 8,500RPM.  No reason to rev past that, unless you're asking for trouble.  It's a big risk (and a waste of money) you're taking just to brag you can rev that high...
-Ted
The engine has vibration issues at 8,500RPM.  No reason to rev past that, unless you're asking for trouble.  It's a big risk (and a waste of money) you're taking just to brag you can rev that high...
-Ted
oh an btw goign passed 9k was weird since after i rebuild the engine i hit the fuel cut twice already at 8600. (atlest what the tach says)
Last edited by Kahren; 02-27-03 at 02:12 PM.
#14
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Be careful how you read my reply - I said "torque", not "power".  Sure, it still makes power, but your torque would've dropped off a lot by then.  There is no way a stock ported (or even street port) engine is going to make serious power up that high.  The engine ports are just too restrictive to be making significant gains at that high an RPM.
-Ted
-Ted
#15
Do a barrel roll!
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Originally posted by SureShot
Duh? - The rev limiters action is to cut fuel..
Duh? - The rev limiters action is to cut fuel..
#17
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Originally posted by Rxmfn7
Not the way I understand it. Fuel cut was a function of the turbo ECU to cut the fuel once you hit a certain boost level. Rev limit is a function of the ECU that just limits the rpm the engine can rev. You can bounce of rev limiter and do no damage (not advisable though). But if you hit fuel cut you can detonate and cause severe damage. Please correct me if Im wrong..
Not the way I understand it. Fuel cut was a function of the turbo ECU to cut the fuel once you hit a certain boost level. Rev limit is a function of the ECU that just limits the rpm the engine can rev. You can bounce of rev limiter and do no damage (not advisable though). But if you hit fuel cut you can detonate and cause severe damage. Please correct me if Im wrong..
Henrik
87TII
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shouldn't the rotors be clearanced also if the engine is being revved up THAT high to prevent the rotors hitting the housings? i read that from Racing Beat...
#20
I dont know a damn thing
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Yea....why ask it again if you read it at racing beat? so lets realize what weve learned today...Unless your a road racer there is no reason to rev that high other than having it as some personal dick trophy but your also asking for trouble if you dont have the mods to the motor/rotors and a scatter sheild for the clutch when it departs.
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i am simply asking! why are u guys gettign mad, i did say i plan to road race teh car, that is why i would LIKE to have a higher redline, but if i cant do with what i have then i eitehr have to mod it or leave it as it is and deal with it. i know that revving past 9k is dangerous, and if i do get rid of the rev limmiter then i WILL get a scatted shield.
88 SE whats your ptoblem? u cant explain yourself without soudning like a dick?
88 SE whats your ptoblem? u cant explain yourself without soudning like a dick?
#23
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Originally posted by Henrik
Both the rev limiter and boost "limiter" work by fuel cut.
Henrik
87TII
Both the rev limiter and boost "limiter" work by fuel cut.
Henrik
87TII
funnie, i was sure that the na's used ignition cut for the rev limiter
-Shawn
#25
Rotors still spinning
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Racing Beat and Mazdatrix recommend a scattershield on anything revving past 10000. However, its better to be safe than lose bodyparts if something bad should happen. Turbostreetfighter revs his engine up to over 9000 all the time. It is a race car though. He still has stock seals and bearings too. granted the 3rd gen bearings are better than the 2nd gens. You aren't going to be making any more usable power up that high if you are running the stock intake manifold. The ports can flow enough air but the intake runners are physically too long to give you a useful power range this high, especially with a stock computer as well. If you want to take an engine this high then you should design one solely around this purpose such as new exhaust design, intake design, headers, porting, bearings, clearancing, oil pressure, etc... Since the production rotary has no center bearing on the eccentric shaft, it is prone to slight flex at very high rpm's. This flex gets very dangerous as rotors start wanting to touch housings and other nasty things. This is the reason for greater clearancing. It leaves a little more room to flex. Guru Racing makes a 2 piece eccentric shaft that allows for a center bearing. They shift their engines at 9500 rpm but the rest is also designed for it. If your motor is still relatively stock (factory components and clearancing not porting) just try to optimise power within the range it is in now. You'll be happiest and safest this way.
Last edited by rotarygod; 02-28-03 at 08:55 AM.