In my 94 gsr when i redline 1st and hit 2nd it comes out of v-tec then has to hit again. Shifting 3rd,4th and 5th it comes right to 6k when i shift so its in v-tec. Any reason why it does this?
Thanks in advance.

 

Some one told me buying a performance clutch master cylinder would solve the problem but i cant make the least bit of sense out of that.

 

I assume you have a DC2. Only the IAB disengages between 1st and 2nd. VTEC is at 4400 RPM and IAB is at 5750RPM (Helm number).

 

I feel it hit at 6k in first then shift 2nd and it goes to about 5500 and dogs it bad then creaps up and hits v-tec at 6k again then i shift 3rd and it goes right to 6k etc.

 

What car do you have? You cannot reallt hear the VTEC engage on a stock 94-01 GSR (DC2 or DB8). VTEC engages at 4400 RPM for those cars unless the ECU has been modified.

 

I have a 94 gsr, i can hear the v-tec LOUD AND CLEAR in any gear. It hits hard at 6k in every gear. Stock ecu no mods.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by str8JDMteggy &raquo;</TD></TR><TR><TD CLASS="quote">I have a 94 gsr, i can hear the v-tec LOUD AND CLEAR in any gear. It hits hard at 6k in every gear. Stock ecu no mods.</TD></TR></TABLE>

Listen closly at 4400 RPM. That is when you VTEC engages. Near 6000 RPM (5750 to be exact) is when the Intake Air Bypass opens the butterflies for the short intake runners, which emit more noise.

 

Ok yes now i know what your talking about. I take that back v-tec does engage at 4400 rpm because i do remeber it being really loud when my exhaust broke. Why does it pull so much harder at 6k when the IAB opens?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by str8JDMteggy &raquo;</TD></TR><TR><TD CLASS="quote">Ok yes now i know what your talking about. I take that back v-tec does engage at 4400 rpm because i do remeber it being really loud when my exhaust broke. Why does it pull so much harder at 6k when the IAB opens? </TD></TR></TABLE>

Mine does not pull harder when the IAB switches. It could be perception where noise is associated with greater performance. That is basic human psychology.

 

Maybe it just does feel like it pulls harder becuase of the noise, when really its pulling harder just due to the fact that the car loves high rpms and i think this "pulling" in my head is due to the noise at 6k. Thanks again.

 

check your oil!!! i had the same problem vtec cutting in and out, i think thats what you meant kinda hard to understand what your trying to say

 

In a Type-R the gearing was designed to keep the engine in VTEC when shifting at the rev limiter.

The gearing in the GS-R transmission was not designed this way. Not only is the gearing taller than the Type-R (first gear is the same in both models), the GS-R also has a lower rev limit.

 

in all actuality the car should pull a little harder at 6k cause the engine is getting more air=more power. not as much as a difference a the camshaft slidding onto a bigger lobe but still a difference.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Haleiwa-Brando &raquo;</TD></TR><TR><TD CLASS="quote">In a Type-R the gearing was designed to keep the engine in VTEC when shifting at the rev limiter.

The gearing in the GS-R transmission was not designed this way. Not only is the gearing taller than the Type-R (first gear is the same in both models), the GS-R also has a lower rev limit.</TD></TR></TABLE>

A stock 94-01 GSR does not drop out of VTEC when performing an incremental redline shift.

 

a b18c1 with an ls tranny stays in vtec when you shift to 2nd and 3rd. it's only 4th and 5th it will drop out so if your stock gsr drops out of vtec when you shift you probably have some sort of problem with your car.

 

So is nothing is wrong when i shift second and it comes down to before the iab open? If so why would honda design it that way?

 

your not dropping out of vtec. i agree with Dogginator.

 

First To Second Gear Does Fall Out Of VTEC Depending On Where You Have Your VTEC Set For I,m Tuned For A 5150RPM VTEC Engagement And Fall Out Of VTEC Shifting Into Second, If Your VTEC Is Stock At 4400 And You Have A Single Stage I.M. Then You Will Not Fall Out Of VTEC But You Will Lose Your Low & Mid End Torque With VTEC So Low, And Not Being Tuned, IT'S ALL IN THE GEARING!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by str8JDMteggy &raquo;</TD></TR><TR><TD CLASS="quote">Some one told me buying a performance clutch master cylinder would solve the problem but i cant make the least bit of sense out of that.</TD></TR></TABLE>

That indeed makes no sense at all.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4DRDB8GSR &raquo;</TD></TR><TR><TD CLASS="quote">First To Second Gear Does Fall Out Of VTEC Depending On Where You Have Your VTEC Set For I,m Tuned For A 5150RPM VTEC Engagement And Fall Out Of VTEC Shifting Into Second, If Your VTEC Is Stock At 4400 And You Have A Single Stage I.M. Then You Will Not Fall Out Of VTEC But You Will Lose Your Low & Mid End Torque With VTEC So Low, And Not Being Tuned, IT'S ALL IN THE GEARING!!!</TD></TR></TABLE>

You need an ITR or B16 tansmission. Or you need to raise your redline to at least 8755 RPM.

 

...if you can shift fast enough you can get the rpm's to drop to 6200 going from 1st to 2nd :-D.....and has to be on 15in rims..16's are a tad bit big for it to stay in high rpms between gears if your car is stock.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lauj87 &raquo;</TD></TR><TR><TD CLASS="quote">...if you can shift fast enough you can get the rpm's to drop to 6200 going from 1st to 2nd :-D.....and has to be on 15in rims..16's are a tad bit big for it to stay in high rpms between gears if your car is stock.</TD></TR></TABLE>

Joke? (I hope.)

 

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

Joke? (I hope.)</TD></TR></TABLE>

yeah i thought so too...until i tested it..that 1 inch rim difference makes a difference...tho i don't feel it much. from redline in 1st to second with my 16 5zigen rpm drops to about 5900-5800 and with the 15 in rims drops to 6,100 6200.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lauj87 &raquo;</TD></TR><TR><TD CLASS="quote">

yeah i thought so too...until i tested it..that 1 inch rim difference makes a difference...tho i don't feel it much. from redline in 1st to second with my 16 5zigen rpm drops to about 5900-5800 and with the 15 in rims drops to 6,100 6200.</TD></TR></TABLE>

You must be slipping the clutch or tires during shifting. Otherwise, the RPM drop is only determined only by the gear ratios.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dogginator &raquo;</TD></TR><TR><TD CLASS="quote">You need an ITR or B16 tansmission. Or you need to raise your redline to at least 8755 RPM. </TD></TR></TABLE>

Actually I'd Have To Raise It To 9100 RPM

I,m On 16" Rotas Wrapped In 205/40s With This Cofiguration And My Tune
I,d Have To Shift Out Of 2nd At 9050RPM To Stay In My Torque Curve

Stock GS-R Tranny On 205/40R16s @30MPH:
1st Gear=6100RPM
2nd Gear=3550RPM
3rd Gear=2550RPM
4th Gear=1875RPM
Final-O/D=1500RPM

This Indicates That From:
1st-2nd Your Revs Will Drop 2550RPM
2nd-3rd Revs Drop 1000RPM
3rd-4th Revs Drop 675RPM
4th-5th Revs Drop 375RPM

So With This Being My Dyno I'd Want To Stay Between 6000-7500RPM


With A 1500RPM Usable Torque Length I,d Want To Shift Out Of:
1st At 8550RPM(2550Drop-8550RPM=6000 Where My Torque Starts)
2nd At 9050RPM(1500TQ Length+2550Drop-1000RPM 2nd Gear Drop=6000RPM)
3rd At 7825RPM(1500TQ Length +1000Drop-675 3rd Gear Drop-6000RPM)
4th At 7800RPM(1500TQ Length +675Drop-375 4th Gear Drop=6000RPM)

Now Back To The Origanal Post YES You Will Fall Out Of VTEC With A High Torque Curve, Stock Cams, And Gs-R Gearing

Since The Highest I Can Safely Shift At Is 8100RPM It Means That Shifting Out Of 2nd At 8100, I Will Land At 5050RPM In 3rd Gear Out Of VTEC (Tuned For 5150 VTEC Engagement)

Hope This Helps, And Is Not TOO Confusing

 

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

You must be slipping the clutch or tires during shifting. Otherwise, the RPM drop is only determined only by the gear ratios.</TD></TR></TABLE>

Not True!!!