The car bogs when i engage vtec lol

i was running a mugen chipped p28 on my gsr with ctr pistons b16 head

it was running like a champ with the stock cams now it falls on its face when i engage vtec

crome pro here i come!

thought id share

 

your gonna need a tune, same thing happened to me when i went from itr cams to blox type b.

 

i can hear my valvetrain like hella too! was told its normal and its adjusted correctly too!

 

where's your vtec x-over? might be to low for those cams. Mines is like 5900 on my gsr w/ blox B's basically same as s2 stage 2 cams. My gsr w/ bc3 cams is like at 5400 rpm.

 

Same here with my BC3+. Drive very carefully to the dyno

 

your vtec crossover is too low.

You need a tune.

Drive it easy.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by preludedriva &raquo;</TD></TR><TR><TD CLASS="quote">thought id share </TD></TR></TABLE>
Thanks for sharing! Now get it tuned and share the dyno sheet!

 

its at 5700 then blam falls on its face lol

am i supposed to be hearing my valves? i got em adjusted

 

Sounds like something might be out of spec. And you DEFINITELY need a tune.

Quick ? while we're on the topic...on Skunk2 Stage 2's on a C1, what RPM should the VTEC engagement be raised too? And anyone know the rev limit on these cams while still retaining usable power?

 

It's going to be different for every motor and compression ratio, no one can tell you from the top of their heads man.

Mine have a usuable rpm range up to 9400 before the power stops climbing. Others don't make it much past 8500. All depends on the setup. Just take your own advice, get a tune.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by preludedriva &raquo;</TD></TR><TR><TD CLASS="quote">its at 5700 then blam falls on its face lol

am i supposed to be hearing my valves? i got em adjusted</TD></TR></TABLE>

u might not be hearing ur valves, u might be hearing ur rocker arms. it sounds like u have some worn lma's.

but some noise from ur head is normal with a larger cam. if u think its loud with stage 2's than u should hear it with pro 3's there loud as hell.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by preludedriva &raquo;</TD></TR><TR><TD CLASS="quote">i can hear my valvetrain like hella too! was told its normal and its adjusted correctly too!</TD></TR></TABLE>

if adjusted correctly, its normal with larger cams. check the condition of them in a few hundred miles if in doubt.

 

i got stage 2 cams and love em. vtec is at 5500 all the way to 9200. before it was tuned it would hit vtec at 49 bog a little dem go crazy from 55 to 9200. I just changed my headers to smsp. DO I need to get a retune

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mhollaek9 &raquo;</TD></TR><TR><TD CLASS="quote">i got stage 2 cams and love em. vtec is at 5500 all the way to 9200. before it was tuned it would hit vtec at 49 bog a little dem go crazy from 55 to 9200. I just changed my headers to smsp. DO I need to get a retune</TD></TR></TABLE>

Your AFR's get affected from any and every change you make to your motor. Things like changing your intake piping, your intake filter, your header, throttle body, exhaust piping, muffler, etc. etc. etc. can alter your AFR's. I run software that self-tunes in my cars, so I never have this problem. I set the AFR's to where I want them to be, and my software takes over and adjusts accordingly. for BRE.

 

You do know that throttle transitions affect the measured AFR's pretty much? Every pushing the throttle richens air-fuel while letting it off richens it than leans it out. You can effectively measure AFR and tune a car on the street at steady throttle positions only otherwise your measurements will be faulty. So letting a software autotune the maps while driving a car normally is a bad way. Well this is what I have experienced at least using CROME.

 

intake is at .006 (didnt have .007 for some reason)
exhaust is at .008

im getting tuned tommorrow morning

yeah it bogs at 5700 i didnt know it had to be changed to get it to run correctly figured if the A/F and timing was good it would be fine but who knew

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jay_Sensing &raquo;</TD></TR><TR><TD CLASS="quote">It's going to be different for every motor and compression ratio, no one can tell you from the top of their heads man.

Mine have a usuable rpm range up to 9400 before the power stops climbing. Others don't make it much past 8500. All depends on the setup. Just take your own advice, get a tune.</TD></TR></TABLE>

Yeah, just go get it tuned... Every motor is different.... With the same cams, I had my VTEC set at 4300 RPM....

 

vtec works! i guess the car wasnt warm enough cause i just got on it for the hell of it and it cracks tuning in the morning!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr_henrik &raquo;</TD></TR><TR><TD CLASS="quote">You do know that throttle transitions affect the measured AFR's pretty much? Every pushing the throttle richens air-fuel while letting it off richens it than leans it out. You can effectively measure AFR and tune a car on the street at steady throttle positions only otherwise your measurements will be faulty. So letting a software autotune the maps while driving a car normally is a bad way. Well this is what I have experienced at least using CROME.</TD></TR></TABLE>

I understand what you are saying. Every time I cross a different throttle range or different vaccuum column, a cell gets filled up with AFR data. The data in those cells are constantly being averaged. That average AFR is then compared by the software to what your desired AFR's are for that cell. I can adjust desired AFR's for each and every cell (meaning EVERY throttle position and at any Manifold pressure). The software then adjusts the fuel delivery for that cell to accomodate and to reach my inputed AFR's for that cell. After, I can verify my software's adjustments by doing an idle to 9400 rpm run and watching my software plot my AFR's on a graph....13:1 flat across the board. Motor has never burned oil, nor has it ever blown smoke. Car runs PERFECT. I swear by this software and this software alone....so much that I have friends with OBD2 cars converted to OBD0 just to run this software.

BTW, I run LogWorks software that was supplied with my Innovate LC-1 wideband at the same time as my software datalogs AFR's. Comparing the two softwares, AFR's are off by approximately .1 or less....So I know that my software is indeed accurate.

I leave my laptop in my passenger seat and let the software datalog away...I love it.

 

how much is this system ?? i allways wanted to run a lap top to monitor the car motor

 

Free. Visit http://forum.pgmfi.org for more information. The software is called BRE....you'll have to do your reading though.

 

just got a good ole street tune

vtec engages at 5500 runs great

 

im not revving past 8200 when i get on it too scared i got stock b16 valve trian at the moment gotta invest in a new setup

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by preludedriva &raquo;</TD></TR><TR><TD CLASS="quote">im not revving past 8200 when i get on it too scared i got stock b16 valve trian at the moment gotta invest in a new setup</TD></TR></TABLE>

wow, stage 2 cam with stock springs.......

 

yeah i know ima take it easy on the car til i get springs and retainers


can they be installed with the head on?