Choosing rev limit on b16a2?

[jono]

I know this has been discussed alot, but alot of the posts contridicted each other with people saying ya can rev safely to 9k, some saying anything past 8500 is asking for trouble...

So, im getting my b16a ecu modified to run a b16a2, and im guna use a gtech to crudely tune it by looking at G's pulled thru out the rev range.

I already know that thru 1st and 2nd i would most likely benefit from a increased rev limit, i have a b16a2 with most bolt on's but stock internals, so would 8800rpm be safe?

What are people who are getting gizzmo's this month setting there's to?

[garg]

plz correct me if im wrong but i though that as long as you ran stock internals you shouldnt rev a b16a/b16a2 much over 8000 rpm if you want long life out of your engine...

[dethy]

*sigh*

Isnt it true that with stock internals theres no point in increasing the rev limit....what are you trying to achieve, more engine wear?

[PH4T SI]

there is little point to increae your rev limit that far unless you have a lot of after market mods done. increasing your revlimit doesn't give you a better peak power curve, you need cams for that, and to rev that high safely after market internals would be a good idea, for example, my old prelude could rev out to 7k rpm but my peak power was 6250 rpm, no point to rev past that point as there is no power gain.

my 2c

[SOHC_MY_DOHC]

i got my b16a2 with stock internal chipped, once i missed into 2nd and revved off the clock, makes u crap u pants, plus u lose power if u take it past 8500rpm

[ciacia]

REV it as high as possible until one of your valves drop
thats one way to now how high your engine can REV
no kidding...!!! :wink:

[baked-]

with out cams dude , you will lose power above 8000 so theres no point

dont tune off a G sensor , tune by the feel of the car and the sound of the engine and a A/F guage if anything

[dohca]

8200 rpm max on stock b16a or b16a2...

hence why the rev limit is set there from factory.

[David R]

Mine is at 8700, and I wish it was higher. When I had my car dyno tuned peak power was at 7970rpm, so if I have to change on (or before) the standard 8200 rev limiter I drop quite a way back down the power curve. When I'm racing I'll usually change at around 8500 (or slightly higher) to try keep the revs further up the power curve.

[MUGENPRO2]

last summer drag i hit 9000rpm constantly through every gear that i change, on the third run it below up coz i lost count of my rev.

so if u gonna hit hi rpm i think u'll gonna get like 20runs down the track on stock engine.

[Cyclone21]

stick to 8,400rpm, no more on stock b16a2.

Once you have done internals then you can rev higher.

[jono]

Thanks for that.. Peak power is below the rev limit but still make good power past peak its not like it drops off drastically from dyno's ive seen esp with good headers that suit the higher rpm (i got cements old ones) so thought it would help changing at higher rpm. Also next gear falls higher up on the power curve so the same area under the 'power verses time' curve could be obtained in less time (or is it more area in the same time.. ive confussed myself), anyway ya get greater accelleration and thats the point.

Some people posted last year that Gizzmo set there rev limit at 8700 another to 8900 on a stock engine so think i'll try 8600 just to be safe and hopefully wont break anything if i do you all can laugh at me ops:

[David R]

Bah set it for 9k, you dont have to hit the limiter every gear!!! I've had no problems with mine yet taking it to 8600, just dont do it every day... 8)

[BoyCiviC]

Originally Posted by baked-

dont tune off a G sensor , tune by the feel of the car and the sound of the engine and a A/F guage if anything

isn't that as bad as tuning it using the butt/seat of the pants dyno?

i mean, if you really want a quantitative increase or smoother power/torque curve a proper dyno is the only way to go isn't it?

[jono]

I was thinking ya could hook into digital output of gtech and data log it thru a quarter mile run see where abouts in the rev's roughly the G's are being pulled. Dunno if anyone's done that or if its even possible? George prob knows...

[ef9]

most b16/18/20s ive seen on dyno's have max power about 7700, i think that they put the redline to 8k so when u change to next gear ull be in vtec,,well, thats what i found on mine,,,,,,

[HUSSLAA]

Originally Posted by baked-

dont tune off a G sensor , tune by the feel of the car and the sound of the engine and a A/F guage if anything

hope you're being sarcastic mang..

[Coupe-R]

Umm to clear things up thr standard cutout on a b16a2 is 8450 i am guessing u could hit 8700-8800 quite often as long as your car is well maintained and all should be well, but if u have no internal mods leave it at 8450 it is perfect for changing gears and staying above vtec point of 5800rpm

[Matty]

Weird. I seem to stay in VTEC when I change gear at 8000rpm. That's a B16A2 with a S4C box.

If your valve springs are getting on abit you might start suffering from valve float above 8500rpm. I wouldn't say you could rev "safely" to 9000, but you might be able to get there a few times before breaking something.

[jono]

The point where vtec first engages and the point where it disengages is different, its got some hystoresis so if your cruising along at 5600 exactly ya wont be going in and out of vtec, youl be in vtec and stay there untill rev's drop below 5300 for example, not sure on exact figures, so ya can get away changing at like 8k without dropping out of vtec even tho rev's may drop below 5600.

Redinteg where did you get the 8450 rev limit figure from i thought it was a bit lower than that?

[MarkE]

The Factory Revlimit is there for a reason.......a very good reason :wink: