Safe Rev Limit? (searched)
09-19-2005, 10:01 PM
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Safe Rev Limit? (searched)
i was wondering what is a safe rev limit for a D16Y8 with complete stock internals. i shift at 7100 but since i have a turbo i was curious if could go past the stock rev limit. now i dont want to rev hard and push it down to 8500, i just want a slight increase of about a couple hundred rpm. is it safe??
Thanks in advance
Thanks in advance
09-19-2005, 10:06 PM
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Re: Safe Rev Limit? (M2nR22)
If you're boosting with stock internals, I wouldn't recommend shifting any higher than a couple hundred rpm below redline. If you don't have aftermarket cams (maybe not necessarily aftermarket, idk) you more than likely won't make that much more power shifting any higher. You increase the chance for something to go wrong. No one likes a floated valvetrain. 
09-19-2005, 10:35 PM
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Re: (gapergurlie_18)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DestructoEH »</TD></TR><TR><TD CLASS="quote">If you're boosting with stock internals, I wouldn't recommend shifting any higher than a couple hundred rpm below redline. If you don't have aftermarket cams (maybe not necessarily aftermarket, idk) you more than likely won't make that much more power shifting any higher. You increase the chance for something to go wrong. No one likes a floated valvetrain. </TD></TR></TABLE>
What he said. Except that with the turbo its quite possible to still be making power after redline. But with a stock valve train, thats asking for a broken engine due to valve float and other issues. Might be able to get away with it with some aftermarket valve springs though.
What he said. Except that with the turbo its quite possible to still be making power after redline. But with a stock valve train, thats asking for a broken engine due to valve float and other issues. Might be able to get away with it with some aftermarket valve springs though.
09-20-2005, 12:35 AM
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Re: (Djaric)
i dont know about y8's... but my friend had a z6 that got overheated and he took it up to 8 grand and it floated the valves.. but nothing happened.. he did it a couple of times.. it pulled all the way tho.. semi built head but valve springs were ****
09-20-2005, 04:24 AM
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Re: (siregcivic)
Stock Z6:
**** factory redlines.
I've tached that in nuetral, 1st, 2nd. and 3rd. I was a bit scared to do that in 4th.
But my Z6 was a freak. Another Z6'er wanted to use my ECU, but his would float right before 8 grand, yet mine would do it. Mine only floated if I didn't warm up the car.
Pull back timing on distributor, because with a SOHC, you're also "changing" where the poweband is, and have fun past 8000.
**** factory redlines.
I've tached that in nuetral, 1st, 2nd. and 3rd. I was a bit scared to do that in 4th.
But my Z6 was a freak. Another Z6'er wanted to use my ECU, but his would float right before 8 grand, yet mine would do it. Mine only floated if I didn't warm up the car.
Pull back timing on distributor, because with a SOHC, you're also "changing" where the poweband is, and have fun past 8000.
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09-20-2005, 06:32 AM
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Honda engineers spent countless time developing their motors and the safe limints to them. If you want a race car than get one, if not i would go by what the engineers set it to for safety.
09-20-2005, 07:30 AM
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Re: (dgmorr)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dgmorr »</TD></TR><TR><TD CLASS="quote">How do you know when your valves float?</TD></TR></TABLE>
I was wondering this myself
I was wondering this myself
09-20-2005, 11:11 AM
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Re: (SE7EN3S)
It's caused by weak springs and high revs. The valves don't return closed fast enough before they're opened again because of the weak springs. They 'float'. Not sure if you were asking WHAT it means, or how can you tell. I want to know how you can tell 
09-20-2005, 11:16 AM
#14
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when your valves float is when your valvesprings give out so the cam keeps spinning and the springs cant return the valves to a closed position....
if you ever hear your valves float... it sounds like if you are accelerating.. you will lose all your power and your intake will be very very fucing loud..
you will know when valves float dont worry
if you ever hear your valves float... it sounds like if you are accelerating.. you will lose all your power and your intake will be very very fucing loud..
you will know when valves float dont worry
09-20-2005, 11:47 AM
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Re: ({PBA}Threat)
It sounds like a second, even wilder VTEC. But you feel the power just DROP, like you put on the brakes.
vvvoooooooo(VTEC)OOOOOOOOOO(Float)AAAAAAAAAAA
1...2...3...4...5.........6..........7.........8.. .......(1000 R/MIN)
vvvoooooooo(VTEC)OOOOOOOOOO(Float)AAAAAAAAAAA
1...2...3...4...5.........6..........7.........8.. .......(1000 R/MIN)
09-20-2005, 01:15 PM
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Re: Safe Rev Limit? (jtreuno88)
summary:
You WILL hear floating valves.
Stock cams, dont change your rev limiter, cause the powerband is the same.
Turbos put more stress on the pistons and rods and crank, don't overrev the engine as your valves could overlap too much, could snap a rod, your not making enough power up there, and with your stock cam your REALLY not gonna make any noticable power above the rev limiter.
If you change your cam, or swap to a Z6/Y8 head on another D block, no need to up the rev limit. My redline is 6750 and fuel cuts at 7100
You WILL hear floating valves.
Stock cams, dont change your rev limiter, cause the powerband is the same.
Turbos put more stress on the pistons and rods and crank, don't overrev the engine as your valves could overlap too much, could snap a rod, your not making enough power up there, and with your stock cam your REALLY not gonna make any noticable power above the rev limiter.
If you change your cam, or swap to a Z6/Y8 head on another D block, no need to up the rev limit. My redline is 6750 and fuel cuts at 7100
09-20-2005, 08:00 PM
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Re: Safe Rev Limit? (Redline96LX)
ok so basically right now i should stay within my stock redline. future on if i decide to build my internals (cams, valves, valve springs, etc.) it is then were i could prolly rev harder right?
ko0! thanx to everone that helped me out
ko0! thanx to everone that helped me out
09-20-2005, 08:27 PM
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Re: Safe Rev Limit? (M2nR22)
you ever seen a d series at 9,500 rpm? Well I did, it was scary because it decided to try to overheat after that. Still ran fine though, it doesn't mean that it made power past 7 grand.
Yeah turbo car should be shifted at redline or before redline. I take my d up to 7,400 rpm sometimes if I get carried away, but it still doesn't mean that you make power up there.
Yeah turbo car should be shifted at redline or before redline. I take my d up to 7,400 rpm sometimes if I get carried away, but it still doesn't mean that you make power up there.
09-20-2005, 08:46 PM
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Re: Safe Rev Limit? (ABK)
off topic but i have a jdm zc d16a6 basically. i had a 50 shot wet on it and i was spraying on the highway testing it after i put it in it was fine. Then later that night i did it again and it was fine till about 6300 then it started to do what siregcivic said i laid of right away. I was confused i thought it was detonation from lack of fuel so i put a b&m fpr on it and it is fine so whats up? I had timing 3 degrees retarded.
09-20-2005, 09:13 PM
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Re: Safe Rev Limit? (91jdmhatchback)
its no use to go that high in rpm because ur engine makes its peak power at about 7000 rpm. I know mines a B16 and it gets 160 hp at 7600 rpm.....above that is a waste of gas and over time u'll blow ur engine up. Do what u want, not my car.....just a thought
09-20-2005, 09:21 PM
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If you're not making ANY power, or your powerband drops WAY before 8,000 RPM, why risk ******* your engine to think you're cool because you can rev the **** out of a bone stock D16Z6?