What's up all. I don't post in the ITR forum because, well, I don't have an ITR. I do however have a GS-R with ITR springs and retainers (along with Toda A's). I was wondering if you guys could help me out with a couple of my questions. I tried the all motor forum, and searched, but I didn't get enough responses for me to be sure on what's been said (9k safely)...

the questions are:

-How high can I safely rev my car, which has ITR springs and retainers, and Toda Spec A camshafts?

-I'm getting an ECU soon that's had it's rev limit moved up (9200 I think?). I'm kinda scared to test exactly where the limiter is at. Should I be okay if I'm revving my car based on what the tachometer is telling me? I was thinking of shifting around 8500 just to play it safe...

I appreciate any and all comments I can get from you guys. Thanks!

 

stay in the red son, stay in the red

 

I was good to what looked like 9.5K on the stock ITR tach and ITR valvetrain.
The/my stock tach read about 400 rpm at that speed and the Mugen ECU I was using redlined at 9100.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by baonest &raquo;</TD></TR><TR><TD CLASS="quote">stay in the red son, stay in the red</TD></TR></TABLE>

LoL, what???

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zygspeed &raquo;</TD></TR><TR><TD CLASS="quote">I was good to what looked like 9.5K on the stock ITR tach and ITR valvetrain.
The/my stock tach read about 400 rpm at that speed and the Mugen ECU I was using redlined at 9100.</TD></TR></TABLE>

So then, you're saying that your tach was reading 400 rpm more than it should have been? What kind of camshafts were you using on your ITR valvetrain?

 

Original cams. 97 ITR.

 

stock tach is WAYYYY off, don't even rely on it... Listen by ear.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B2FiNiTY &raquo;</TD></TR><TR><TD CLASS="quote">stock tach is WAYYYY off, don't even rely on it... Listen by ear. </TD></TR></TABLE> when you hear a boom, you've gone too far.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B2FiNiTY &raquo;</TD></TR><TR><TD CLASS="quote">stock tach is WAYYYY off, don't even rely on it... Listen by ear. </TD></TR></TABLE>

That doesn't work, because the motor sounds like it will rev forever!
Just remember the tack reads about 4-500 rpm high at 9K (real) rpm.

 

Hmmm... is this why GS-R owners think that their car redlines at 8200, when it really redlines at 8000? When I rev my car to the limiter, it stops at 8200 currently, but from what you guys have posted, it sounds like it's actually at 8000.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alfaaay &raquo;</TD></TR><TR><TD CLASS="quote">Hmmm... is this why GS-R owners think that their car redlines at 8200, when it really redlines at 8000? When I rev my car to the limiter, it stops at 8200 currently, but from what you guys have posted, it sounds like it's actually at 8000.</TD></TR></TABLE>

I'm pretty sure redline is 8000 and the rev limiter is 8200.

 

stock tach is off around 400 rpm for me under heavy acceleration, a little less when cruising...

 

stock valvetrain with stock cams is good to about 92-9300rpm, which is about 9500 on the tach

 

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

I'm pretty sure redline is 8000 and the rev limiter is 8200.</TD></TR></TABLE>
Get your info right folks...8100 redline, fuel cut 8200. If I follow my tach, I'm actually hitting the limiter around 8600 rpms on my GSR.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sgT &raquo;</TD></TR><TR><TD CLASS="quote">stock valvetrain with stock cams is good to about 92-9300rpm, which is about 9500 on the tach</TD></TR></TABLE>

What about cams that are slightly more aggressive? I've got Toda A's, and would like to avoid bending anything... again

 

Pick up a pill box, or the adjustable unit from summit and either wire up a light somewhere or use one of your existing dash lights as a shift light. Before you change out ECU's determine where the fuel cut off is, adjust the box to match that. Then when you install your new ECU you already have a reference point and can adjust based on that. I personally would stick to 8400 and live a long and happy life. Don't trust a factory tach up there!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alfaaay &raquo;</TD></TR><TR><TD CLASS="quote">-I'm getting an ECU soon that's had it's rev limit moved up (9200 I think?). I'm kinda scared to test exactly where the limiter is at. Should I be okay if I'm revving my car based on what the tachometer is telling me? I was thinking of shifting around 8500 just to play it safe...
</TD></TR></TABLE>

Like everyone else says, the stock tach (for the R atleast) will read a bit higher than you are actually doing... so if the limiter is indeed moved up to 9200, and don't want to risk it all out, you can try just before 9k (which would be around 8.5k or 8.6k in real rpm, just above the factory R redline)... you'll probably start inching it up as you get more and more confident and curious....

Either that or get (or borrow) something that reads the rpm signal directly (RSM or VAFC or anything along those lines) to actually see where things stand between your tach and the engine...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alfaaay &raquo;</TD></TR><TR><TD CLASS="quote">is this why GS-R owners think that their car redlines at 8200, when it really redlines at 8000? When I rev my car to the limiter, it stops at 8200 currently.</TD></TR></TABLE>
yeah my friend is convinced his GSR revs to 8400. I told him if that's the case he's in an R

I my heart was broken when I joined H-T and realized that my R wasn't blessed and that they all rev past 9 on the stock tach

Anywho back to you question I think those bits and pieces you got there should be good with correct tuning up and around 9000 TRUE rpm's safely

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alfaaay &raquo;</TD></TR><TR><TD CLASS="quote">What about cams that are slightly more aggressive? I've got Toda A's, and would like to avoid bending anything... again </TD></TR></TABLE>

A friend of mine has a skunk 2 valve train and stage 2's I believe they are slightly rougher than you cams if i'm not mistaken. He is capable of revving to 10,500 rpm's(I didn't say he was making power up there but its capable of it)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alfaaay &raquo;</TD></TR><TR><TD CLASS="quote">Hmmm... is this why GS-R owners think that their car redlines at 8200, when it really redlines at 8000? When I rev my car to the limiter, it stops at 8200 currently, but from what you guys have posted, it sounds like it's actually at 8000.</TD></TR></TABLE>
Redline on a GS-R is 8100 and fuel cutoff is 8200.

My GS-R shows 8500 before cutoff so it's tach is "only" 300rpm off.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cheezthis &raquo;</TD></TR><TR><TD CLASS="quote">
Get your info right folks...8100 redline, fuel cut 8200. If I follow my tach, I'm actually hitting the limiter around 8600 rpms on my GSR.</TD></TR></TABLE>

See, I should follow my own advice and follow the thread before replying..

but cheezthis, this is the forum that honestly believes they have a 8600rpm fuel cut instead of the commonly documented 8500 fuel cut sooo..

 

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

See, I should follow my own advice and follow the thread before replying..

but cheezthis, this is the forum that honestly believes they have a 8600rpm fuel cut instead of the commonly documented 8500 fuel cut sooo.. </TD></TR></TABLE>
Hehe...this forum believes a lot of things

 

i always go around and sometimes pass 9K had no problems yet

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dave-ROR &raquo;</TD></TR><TR><TD CLASS="quote">but cheezthis, this is the forum that honestly believes they have a 8600rpm fuel cut instead of the commonly documented 8500 fuel cut sooo.. </TD></TR></TABLE>

honda-tech &gt; honda

 

Do people actually believe that their tachs are correct????

Even after reading what the REAL fuel cut and rev limit are?

Idiots.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris N &raquo;</TD></TR><TR><TD CLASS="quote">Do people actually believe that their tachs are correct????

Even after reading what the REAL fuel cut and rev limit are?

Idiots.</TD></TR></TABLE>
My tach holds the key to the most secret b18c1 engine ever!! It's one of those, super special fluke ones that's better than the rest of the stunnaz!!!!!