So, being still a noobie i have a question.

With a stock 96 GSR Intake Manifold my vtec is relatively quiet, and it happens in two stages. I hear one stage engage at around 4400 and another at around 5400 am i imagining things?

Anyway to get this fixed?

I heard about V-AFC's.

Basically i want that really loud intense VTEC.

Im planning to put in
Skunk2 stage 1 pro cams
Skunk2 intake manifold Pro series
Skunk2 Cam Gears
Skunk2 70mm throttle body
Wiseco Pistons
Eagle Rods
Eagle Crank
Skunk2 Valve springs and retainers

suggestions?

 

you do know about the GSR's secondary intake valves that open pre-vtec depending upon throttle positon and rpm. However, your INTAKE AIR BYPASS (IAB) CONTROL SOLENOID VALVE opens the secondareries around 5,751 rpms and disengages below that. so idk why it would seem that your vtec would engage that low.

 

i guess i am hearing the pre-vtec valves open

 

At WOT, a stock P72 will engage the VTEC at 4400 RPM. The IAB butterflies in your intake manifold will open at ~5750 RPM. You only have a single stage VTEC system.

VTEC operation should not be felt if it is tuned properly: basically torque from small lobes should equal the torque form the large lobes at the crossover point. You will need to tune this.

BTW: there are no pre-vtec valves.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dogginator &raquo;</TD></TR><TR><TD CLASS="quote">At WOT, a stock P72 will engage the VTEC at 4400 RPM. The IAB butterflies in your intake manifold will open at ~5750 RPM. You only have a single stage VTEC system.

VTEC operation should not be felt if it is tuned properly: basically torque from small lobes should equal the torque form the large lobes at the crossover point. You will need to tune this.

BTW: there are no pre-vtec valves.</TD></TR></TABLE>

x2

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dogginator &raquo;</TD></TR><TR><TD CLASS="quote">At WOT, a stock P72 will engage the VTEC at 4400 RPM. The IAB butterflies in your intake manifold will open at ~5750 RPM. You only have a single stage VTEC system.

VTEC operation should not be felt if it is tuned properly: basically torque from small lobes should equal the torque form the large lobes at the crossover point. You will need to tune this.

BTW: there are no pre-vtec valves.</TD></TR></TABLE>

'nuff said.

 

Haha i was wondering if any one would catch that "pre-vtec valves" I was trying to write pre-intake runners and typed vtec LMAO.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dogginator &raquo;</TD></TR><TR><TD CLASS="quote">At WOT, a stock P72 will engage the VTEC at 4400 RPM. The IAB butterflies in your intake manifold will open at ~5750 RPM. You only have a single stage VTEC system.

VTEC operation should not be felt if it is tuned properly: basically torque from small lobes should equal the torque form the large lobes at the crossover point. You will need to tune this.

BTW: there are no pre-vtec valves.</TD></TR></TABLE>


And the P72 vtec engages at 4807 rpms actually if you want to get technical. and the ITR engages at 5700.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H22powered_94teg &raquo;</TD></TR><TR><TD CLASS="quote">Haha i was wondering if any one would catch that "pre-vtec valves" I was trying to write pre-intake runners and typed vtec LMAO.


And the P72 vtec engages at 4807 rpms actually if you want to get technical. and the ITR engages at 5700.</TD></TR></TABLE>

The stock P72 engages at 4400 RPM at WOT. My <u>chipped P72</u> now engages at 4800 RPM at WOT, but I tuned it for 96 spec ITR cams so that the transition is seamless.

 

I am just going by what Honda and Hondata says the redline for the P72 is. That is the parameter that my s300 had on it, 4807, for the stock P72 USDM ECU.

 

IDK why, but my S200 p28 has vtec engaging at 5700 and it snaps real loud. Loudest I've personally heard anyways. If you want it to "snap" harder, just get a vtec controller and set your vtec to engage later in the rpms, and by no ways does that give you more power engaging later, in fact it gives you less power. But sounds super wicked awesome!

 

here ya go!

http://www.team-integra.net/se...D=246

 

read this thread...
https://honda-tech.com/zerothread?id=2185921

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mesonerz &raquo;</TD></TR><TR><TD CLASS="quote">read this thread...
https://honda-tech.com/zerothread?id=2185921</TD></TR></TABLE>


good info!!

 

Yes, stock GSR is 4400 rpm, the Type-R is 5300(not 5700). I'm running I/H/E/resonated testpipe/Type-R OEM muffler(still stock B-pipig) with 3"SRI, 68mm Omni Power TB, Skunk2 IM, 01 ITR cams and springs on the stock ECU with a AFC NEO and I can have my VTEC hit really hard and sounds real good at 5000, but it is nice and smooth and doesn't have a big jump at 5300 on my engine setup. Also have found that 5300 works the best for me at the strip. Hopefully this upcoming week, I'll be getting a chip and piping.

 

So what you are saying is that the guys at Hondata are lying or they don't know what they are doing when they set the STOCK parameters on the P72 ECU to 4807rpms on the mapping? Just trying toclarifying.

 

dude seriously, download chrome and look at the packet for the stock p72 or search a few threads here on ht this has been discussed repeatedly. The stock p72 engages vtec at 4400 rpm and the IABs open at ~5750 rpm. You won't hear the vtec most of the time just the IABs. just to prove it to you, why don't you wire up a light to your vtec solenoid and run it into the cabin, at 4400 rpm if your ecu isn't modded or your vtec isn't working then that light WILL come on

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H22powered_94teg &raquo;</TD></TR><TR><TD CLASS="quote">So what you are saying is that the guys at Hondata are lying or they don't know what they are doing when they set the STOCK parameters on the P72 ECU to 4807rpms on the mapping? Just trying toclarifying.</TD></TR></TABLE>


Hondata most likely sets the vtec point to 4807 because that's is where ITR or CTR cams work well in a GSR engine. Type R cams are a common upgrade for GSRs. If someone is at the point of getting a hondata, they have probably upgraded a few other parts on their engine, so it makes sense to raise the vtec point a little higher to better match ITR/CTR cams. 4800 may just work a little better on a modded engine too.

I've had my GSR for more than 12 years, and I can assure you, the factory vtec switch point on my car is at 4400 rpm.