JDM 007

Hey,

I'm wondering if it is safe to take the ITR up to 9000 RPM with a reprogrammed ECU from Kenji?
Will the stock internals allow for this?

There was nothing in the "search" function about this...trust me.

Thanks in advance

007

Ferrell

there are a few people here that take it to 9100 everyday on stock internals.

JDM 007

So is that a "yes", or is that a "well some do and some don't".

Just so I clarify, I will NOT be going to 9000 everyday, I am more curious about it
for the few times a year I go to the track and the odd road rage around town.

TsunamiZC

A much better question is .....is it nessecary ? are you making any power at that RPM ?

JDM 007

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tsunami_zc &raquo;</TD></TR><TR><TD CLASS="quote">A much better question is .....is it nessecary ? are you making any power at that RPM ? </TD></TR></TABLE>

That is a very good question! I understand that by allowing the car to go a bit higher in the RPM range will help me stay in the power range, but at what point will i start losing power?
ITR's are rated at 8000 RPM right?

TsunamiZC

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM 007 &raquo;</TD></TR><TR><TD CLASS="quote">

That is a very good question! I understand that by allowing the car to go a bit higher in the RPM range will help me stay in the power range, but at what point will i start losing power?
ITR's are rated at 8000 RPM right?</TD></TR></TABLE>

umm...if you were to shift normaly at 7900 -8400 RPM , you will still remain in the "power range" (vtec) .....

TypeR 01 886

you have maximum power at 8000 rpms. The reason for allowing the engine to spool to 8500 (stock) is to allow for exactly what you are talking about (staying in the engines power band). There would be no reason to rev out to 9k rpms. If anything it will only cause "slower times" because after about 8200 rpms the engines ability to produce power declines exponentially. For the best shifts and best times it always good to rev to 8500 and shift.

Honda knew what they were doing when they tunes the ITR
Be careful without the rev limiter, I have heard of ppl who did bend vavles by revving that hight, remember your tach can be off. Good luck and have fun.

Ex-ITR5874

Never rev up to more than 9k with stock internals please... But 9k is pretty safe.
And yes, it IS nessecary to hit the 9k rev limit sometimes... It`s not the point if you make power there (Kenji ECU does up to 8700 or so), the point is (or can be), when you at your track day and got sticky tires: If I shift now, the rear breaks loose, so I better hold down the pedal to the metal, no matter what rpm....

Than you go for it and your engines revs up to whatever...

But let me tell you: 9k is safe. A friend got 50k km racing on his b18c6 and runs spoon ecu (9k). He hits the cutoff again and again during a race... A few hundered times a week... The engine runs still strong

TsunamiZC

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TypeR 01 886 &raquo;</TD></TR><TR><TD CLASS="quote">you have maximum power at 8000 rpms. The reason for allowing the engine to spool to 8500 (stock) is to allow for exactly what you are talking about (staying in the engines power band). There would be no reason to rev out to 9k rpms. If anything it will only cause "slower times" because after about 8200 rpms the engines ability to produce power declines exponentially. For the best shifts and best times it always good to rev to 8500 and shift.

Honda knew what they were doing when they tunes the ITR
Be careful without the rev limiter, I have heard of ppl who did bend vavles by revving that hight, remember your tach can be off. Good luck and have fun.</TD></TR></TABLE>

Yes , now this applies to stock ITR cams ....

if you have aftermarket cams ..... (Toda, Jun ...etc) , you could very well see power past 8000 RPM ...

GokuSSJ4

theres no need to rev pass 8400 rpms , is it safe ? some peeps have gotten away with it . i use to rev with stock internals and spoon cams to 8700 rpms with no problems . Even dyno and also no problems beyond that you are taking a chance or the risk of your springs given out on you .. since there not design to rev pass 8400 rpms .

Batoutahell

Then somebody should call King Motorsports up and tell them that 9000 rpm on the Mugen valve springs they sell is not safe.

PM-Performance

i have reved to 9k thousands of times on stock head. going anything over that gets iffy.

v00tecsi

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Batoutahell &raquo;</TD></TR><TR><TD CLASS="quote">Then somebody should call King Motorsports up and tell them that 9000 rpm on the Mugen valve springs they sell is not safe.</TD></TR></TABLE>

We are talking about a STOCK itr valve train. Mugen valve springs would not be considered "stock"

tonyxcom

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Spoon1 &raquo;</TD></TR><TR><TD CLASS="quote">theres no need to rev pass 8400 rpms....</TD></TR></TABLE>

There are, the first thing that comes to mind is not having to bounce the revlimiter for 20 feet to the next turn, when going from 2nd to 3rd to 2nd just makes you slower then riding the motor out to 9k.

Batoutahell

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v00tecsi &raquo;</TD></TR><TR><TD CLASS="quote">

We are talking about a STOCK itr valve train. Mugen valve springs would not be considered "stock"</TD></TR></TABLE>

The secret has been out for a while now. Mugen valve springs are identical to ITR valve springs. https://honda-tech.com/zerothread?id=112093

paRRRker

i take it to 9k everynow and then...especially when im in turns and dont want to lift throttle to shift

v00tecsi

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Batoutahell &raquo;</TD></TR><TR><TD CLASS="quote">

The secret has been out for a while now. Mugen valve springs are identical to ITR valve springs. https://honda-tech.com/zerothread?id=112093 </TD></TR></TABLE>

Not to bring it back up especially in here, but there is absolutely no evidence in that thread that proves that theory!!!

Stunna BEN

DO IT! 9500 is even better. Nothing like a dry rev

vtec.dc2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM 007 &raquo;</TD></TR><TR><TD CLASS="quote">Hey,

I'm wondering if it is safe to take the ITR up to 9000 RPM with a reprogrammed ECU from Kenji?
Will the stock internals allow for this?

There was nothing in the "search" function about this...trust me.

Thanks in advance

007 </TD></TR></TABLE>

i don't think its a bright idea with stock injectors.. i'd upgrade injectors or turn up fuel pressure.. stock injectors duty cycle is like 100% at 8500rpm.. the only reason i've raised my redline to 9K is to avoid hitting redline.

but, before anything, its pointless to upgrade your injectors or turn up the fuel pressure just to accomplish anything.

Batoutahell

Steve (aka Asimo), EP (aka Mr. Mugen-ho) and Mike (peddler of Mugen parts) all agree that Mugen springs are the same as stock. That's pretty strong evidence. Now that you mention it, I haven't heard of any evidence that suggests they are different. Short of a press release from Mugen admitting that their springs are the same as stock, what more evidence do you need?

Gee3

My friend was running a Mugen ECU to 9k rpm's and bent some valves on a B18C Spec R engine.

jorge

ask king what they have to say about mugen springs being the same as stock. That is pretty strong evidance.

v00tecsi

Then why would anyone buy them when they can get itr springs for half the cost if not more? Why would Mugen even bother producing them or even bother putting their name on them?

vtec.dc2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v00tecsi &raquo;</TD></TR><TR><TD CLASS="quote">Then why would anyone buy them when they can get itr springs for half the cost if not more? Why would Mugen even bother producing them or even bother putting their name on them?</TD></TR></TABLE>

same reason people buy mugen valve cover and other alike items?

baonest1

play it safe and dont bother. upgrade valve train and timing belt.. then go play