Let me start off by telling you about the motor. Its a b16a2 with eagle rods, je 9:1 pistons, acl bearings, ac block guard, rev valve train, and gsr cams. the turbo is a t3t04 57 trim and its running on a FMU.

Recently i changed my stock cams to GSR cams. BEfore i changed the cams i didnt have this problem.

The problem is that whenever the car gets into vtec it hits was seems to be a fuel cut. It makes like popping noises. The car drives great but whenever i attempt to get into vtec this happens. Does anyone know what this could be?

thanx
mike

 

so let me get this straight.....you spent money building a turbo setup, and more money building the engine, and then you're running it on an FMU.......i dont see why you'd have problems

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92redhatch &raquo;</TD></TR><TR><TD CLASS="quote">Does anyone know what this could be?</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92redhatch &raquo;</TD></TR><TR><TD CLASS="quote">its running on a FMU.</TD></TR></TABLE>

answered your own question

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BoostedEG6 &raquo;</TD></TR><TR><TD CLASS="quote">

answered your own question </TD></TR></TABLE>

Truth.

 

the fmu is temporary im on 6 psi. The car was driving great with the other cams. I just changed the cams so i can tune the car on monday. i have a set of 550cc injectors

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92redhatch &raquo;</TD></TR><TR><TD CLASS="quote">the fmu is temporary im on 6 psi. The car was driving great with the other cams. I just changed the cams so i can tune the car on monday. i have a set of 550cc injectors </TD></TR></TABLE>

FMU's work, but there are much more reliable ways to upgrade your fuel system for boost, and FMU's fail at the upper end of the rev range/higher pressure, and this sounds like your problem. You need a EMS like hondata, chrome, etc.......... and I bet your problem will stop, plus you can feel confident about you engine, and won't kick yourself in the *** if you screw up your engine because of being lean or rich.

 

the car is going to be tuned on crome.


Before i changed my cams i did not have a problem with this fuel cut. It started happening after the change of the cams.


Modified by 92redhatch at 11:05 AM 11/29/2006

 

A cam with a larger lift will require more fuel, maybe this is your problem, your current set-up can't provide enough fuel, what HP are you pushing?

 

right now on 6 psi my b16 should make like 200whp. The lift from the b16 to the gsr is not that big of a difference. I understand that maybe it could be my problem but i dont think my problem has to do with the fmu. I think that if i take off the fmu and install the injectors that i will have the same problem.

 

im not 100% sure but i dont think the problem is the fmu.

 

u said when u install the cams, u started to get this problem. put the ones u had b4 back one and problem solved.

once u go chrome, put ur gsr cams back on.

don't make it harder then it should be.

 

^ Changing the cams is a lil harder than taking the car to get tuned. Im going to check and see if any of the pins in any of the plugs in the engine bay are loose. If not then im going to put a wideband on the car and see if it might be too much or too little fuel.

 

How are you getting your car to idle with a stock ecu and 550cc injectors???....

 

its a chippen p28. the car idles perfect.

 

i dont have the 550cc injectors on the car now. i have an fmu and stock injectors. When i get the car tuned im going to put the injectors on the motor. I just wanted to make my car run properly on the fmu befor i change the injectors and take it to get tuned.

 

Your running a chipped ecu and a fmu? Why not just ditch the FMU and get the maps tuned out on the ecu? Do you know what map is on the chipped ecu? This might tell somewhat of what might be going on fuel wise, although a wideband would tell all.

What RPM does it start doing this at (wont go past ____ RPM?)

 

about 5700 rpm. when vtec is supposed to be engaged.

 

maybe to much over lap with those cams...and yes its the fmu too cause my friend had that problem cause right after vtec to would start pullin again

 

put your b16 cams back in, see if the problem goes away, if it oes, then u know your fuel supply isnt handling the gsr cams with that fmu, the more u keep trying to push it, your going to expletive up your motor, then you will be assed out even more, take that fmu out, just drive on your stock injectors to the tuner, and put the 550s in there and tune the bitch.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92redhatch &raquo;</TD></TR><TR><TD CLASS="quote">^ Changing the cams is a lil harder than taking the car to get tuned. Im going to check and see if any of the pins in any of the plugs in the engine bay are loose. If not then im going to put a wideband on the car and see if it might be too much or too little fuel.</TD></TR></TABLE>

It's not that hard to change out cams, if you feel uncomfortable by yourself, then go get a haynes manual and look up the torque specs and order. All is need is common sense, a set of metric 6pt sockets and a half way decent torque wrench. I would strongly recommend that you put the stock cams back in.

 

not pointing at the fmu directly, BUT that on top of the 550's, i would start there, and are you on a base map? if so WTF are you goin into vtec and boost on a base?

if neither are the issue, maybe plugs? what heat range? gap?

 

ive changed my cams more then once. ive built my motor twice. i can change the cams in less then an hour. but i know i dont need to. my fuel pressure at idle was 50 psi and at 6 psi(boost) it was 100 psi. so at idle i lowered the psi to 40. also my plugs are gapped to 45. so tomorow im buying new plugs and im going to gap them to 32. After that im going to see if i still have the same problem.

 

the car is driving much better now that i lowered the fuel pressure to 40 psi. However i havent taken it to vtec yet because i want to change the plugs first.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92redhatch &raquo;</TD></TR><TR><TD CLASS="quote">ive changed my cams more then once. ive built my motor twice. i can change the cams in less then an hour. but i know i dont need to. my fuel pressure at idle was 50 psi and at 6 psi(boost) it was 100 psi. so at idle i lowered the psi to 40. also my plugs are gapped to 45. so tomorow im buying new plugs and im going to gap them to 32. After that im going to see if i still have the same problem.</TD></TR></TABLE>

1 - i hope that fp reading was line off of the reg
and with 6 psi what riser are you running? 10:1 should net 110+ if it is a 12:1 should net 122+

2 - plugs gapped to 45 what? 0.045? thats still way too much. i even think the 0.032 lay be a little wide. i am on 8's gapped at 0.018.

either you have an ignition breakup, or piggybacking a chipped ecu 550's with an fmu may be running it pig rich.

again is this a base map? and again if so, stop beating on it til you get it tuned.

 

currently the car is on stock injectors. the fmu is a 12:1 . im not beating on the car. i dont go past 4500rpm. yes its on a basemap. but like i said its temporary.