Trying out a chipped ECU, what's safe beyond the 8100 redline on stock valvetrain?

 

8101 Keep the "STOCK" engine's redline "STOCK"

 

You could take it up to 8400rpm.

 

Why? Stock cams will not make power after factory redline.

 

but it's cool.. take it up to 9500..and then get a custom License plate that says 9500RPM...

 

8400rpm gets my vote, but true, there is no power above stock redline. Unless you are trying to put the tach back in a specific power range.(vtecvoodoo)

 

can a stock gsr handle over 8000 rpms saftley or is there a high change of valve float ect.

 

Great, I don't plan on shifting beyond 8100.

 

sure they will... not more than at 8000 but def more than at 6000.

still why raise the redline though? your shift points are the same regardless, but you will be starting higher up the rpm range if your redline is higher... this might not be a good thing dependingin where your motor makes power.

I have a stock GSR head but a JUN chip that goes to 9500 rpm.. I have taken this head to 8500 easily under WOT, it feels incredible. I want a better valvetrain setup so bad! (Santa Claus do you hear me?) But a few times it has seen 9000 rpm just by revving or mis-shifting which is not as bad an issue as hitting 9000 rpm on a stock GSR setup at WOT (full force possible on valvetrain)... that would get ugly very quickly. No problems so far... remember if there is only a limiter at 9500 rpm, if you "rev it" to high rpms, it wont stop until 9500 and that could be bad... very bad.


[Modified by owen_the_soyboy, 4:03 PM 11/27/2002]

 

brasilracing where did u get your ecu chiped at?

 

A stock set of gsr cams will not make power above 8100 from the dyno sheets ive seen. Put in a set or itr or ctr cams and your making power till 8500 and I would DEFINALTLY not go higher then that. I run a fully build head and I only rev till 8500 safely and i only hit that when racing at a track. There is more to worrie about then valve float, you should be concerned about how well your bottom end is balanced as well. When **** turn turn at the same rate and isnt balanced you get bad things happeneing. I talk from experience

 

to comment on the redline issue..........i have a buddy who has a stock b18c in his car.......with the exception of a some minor bolt ons. victor manifold, jdm 4to1, no cat and a 99si trans with a cm stage 4 clutch.......the car has a money chipped computer.........i can't recall who did it, it was a shop here in oregon.....but we both raced the car a grip.......and both of us shifted it (dependin on gear) at about 9000 on stock internals.......the car ran 14.20's all day on streets, and this is a full interior 92 si with 5 lug.......and no cf hood........and we drive it like that most of the time on the street also, shiftin it at 9000, never had one problem with the motor, maybe were lucky, but i've heard other people around that shift em at 8500 or above, but be carefull, cause on the stock internals at that rpm one miss shift and your gonna be shoppin for a swap.......

 

My friend's B16 with CTR cams stock valvetrain he took his up to 9,000rpm all the time & he went to the street races every night never had a problem.

 

Yeah, you can take it up to 9 grand....but why? You don't make any power above the revlimiter!!!!!

 

I keep it under 8100. I would not chip your ecu yet. what about a vfac.

 

without cams its pointless to rev past 8000rpm, with ITR cams it can actually make power to about 8300rpm (depends on many other things)

but don't run a chip in ecu unless the motor is upgraded

 

So you guys are saying once he passes the stock rev limiter, power will drop to 0 horsepower? No. I think he just wants to rev out the power he IS making a little longer to pull harder. He's still going to make power, just not increasing power.

 

Couter: I am trying out kenji's ecu, VTEC kicks in at 5700 and tops out, I believe over 9100. I haven't gone over 8100, but once it hits the crossover point, it really pulls strong.

 

Stock retainers can split above 8,500 rpm and really bad things happen. I speak from experience-#3 intake retainer split on my B18C1 and dropped an intake valve at 6,000 rpm-it was very ugly. The engine was seeing 8,800-9,000 rpm regularly and the retainer finally gave it up (after 6 months). Proceed at your own peril.

 

One misshift into the high 9k range bent all eight exhaust valves in my gsr...with type R springs and portflow retainers....

 

hey i wouldnt take it past 8100 rpms dude

 

I have my dyno somewhere around here. Stock cams in my GSR and it stopped making power around 7900 or so... it dropped off noticably after that.
I will try to find it again...

 

 

hey. where u at...i could use that stock si exhaust

 

oo was just wondering if you were going local