i got a 91 teg with a 94 b18c1(GSR MOTOR)first of all im using a b16 ECU, and i was told with that computer it doesnt open the intake manifold as much, as would the b18 computer. is that correct?but more important, i got a check engine light for my speedo. Now if your speedo doenst work, your vtec also wont work, because vtech is "activated" after you've reached a certain speed. after like a couple MPH, it doesnt ingage yet, but its more or less "activated" it(cuz you like cant have your vtec kick in while ur in your drive way reving it)so your ECU tells it to activate after a couple MPH. but sense my speedo doesnt work, the ECU cant tell that the cars actaully running. so intill i get the speedo fix next week, my question is if my vtec wont work right now, can i still shift past 4500 RPM's, or will it **** something up, cuz thats when vtec supposed to kick in?

 

My speedometer dosen't work and the check engine light is on as well. It's because of the VSS (Vehicle Speed Sensor) being bad most likely. I've heard that VTEC won't engage with the CEL on as well, but mine kicks right over just fine. It could be because of my VAFC and the changed VTEC setting, but I'm not sure. Nothing bad has happened to me so far with it being like this.

 

you using the stock GSR manifold i would say since your talking about opening the intake. Yea this is true, if you wanna keep the manifold you have to use the p72 GSR ecu. It has the setup for the secondary butterflys in the manifold.

Vtec will engage with the CEL on. You just wont make as much power since the ECU is almost in limp mode. You can rev past 4500 with no problem. The VTEC just wont engage so your engine will experience a loss in power but no harm will come

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AllMotorGSR94 &raquo;</TD></TR><TR><TD CLASS="quote">

Vtec will engage with the CEL on. You can rev past 4500 with no problem. The VTEC just wont engage</TD></TR></TABLE>

huh?

My VTEC comes on with my CEL on but the ECU cuts the fuel at around 6000 RPM.

 

sorry I answered two questions in one sentence,

1st ? . yea vtec will still engage with the CEL on.

2nd ?. you can still rev past your set VTEC point even if VTEC in not functioning

 

is it just me or is vtec engaged by rpm not speed?

 

it is by rpm.

 

i know the code is the (Vehicle Speed Sensor) cuz im getting 17 for the code. now that is more or less with the speedo not working correct? or is it both the speedo cable missing and a bad speed sensor?and "I've heard that VTEC won't engage with the CEL on as well"whats the CEL???and whats "VAFC".and i thought that i couldnt use a p72 GSR ECU is its not vtec, that you had to use any B-series ECU thats vtec.

 

Depends on what CEL your throwing... i'm throwing a CEL and my vtec still engages.. but thats cause i'm throwing code 23 (knock sensor) but i don't have a knock sensor so its no problem. your speed has nothing to do with your motor working correctly.

 

VTEC has to have a few conditions for it to engage. Oil pressure, RPM, something else. Either way you need the stock GSR eco to open the secondaries on the intake at 5700. Also with a CEL VTEC can and cannot work depending on what CEL code is thrown.

tweak, get a knock sensor because without it you can harm your engine.

 

CEL=Check engine light
VAFC=vtec air flow converter....electronic fun lil thing that you can change your vtec engagement point and mess with air/fuel mixture to a certain extent

 

so my vtec should be working fine then, even with a CEL.cuz im only thoughing a speed sensor code.so it should kick right in. but still confused why the b16 ECU wont work. or it will work just fine, but it just wont open up the intake manifold as much as it should beable to open?

 

another reason why im using the B16 ECU and not a GSR is because the GSR ECU is ODB1 and my cars an ODB0. Now i could get the wiring harness to convert it, or i could just put in a b16 ported/polished intake manifold.its easy enough to put in right?

 

yes you could convert the intake manifolds. but I think you have to do some modificatiions to the b16/c5 intake manifold to make them work. It would be much easier using the SKunk2 Type R Manifold for the GSR.

Installation is pretty straight forward and it allows you to reuse the factory throttle body. One downside when using the GSR throttle body is the arm for the butterfly is vertical feed. You need to get a Horizontal Arm Feed which you can find on all b16s and B18s except the GSR. You will also need the throttle cable mount for a Type R.

Inlinefour.com is running a special on the SKunk2. you can get the Manifold, cable mount, and type r throttle cable for around 340.00. You can just go to boneyard and pick up a different arm for the throttle body

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by matto2413 &raquo;</TD></TR><TR><TD CLASS="quote">i got a 91 teg with a 94 b18c1(GSR MOTOR)first of all im using a b16 ECU, and i was told with that computer it doesnt open the intake manifold as much, as would the b18 computer. is that correct?but more important, i got a check engine light for my speedo. Now if your speedo doenst work, your vtec also wont work, because vtech is "activated" after you've reached a certain speed. after like a couple MPH, it doesnt ingage yet, but its more or less "activated" it(cuz you like cant have your vtec kick in while ur in your drive way reving it)so your ECU tells it to activate after a couple MPH. but sense my speedo doesnt work, the ECU cant tell that the cars actaully running. so intill i get the speedo fix next week, my question is if my vtec wont work right now, can i still shift past 4500 RPM's, or will it **** something up, cuz thats when vtec supposed to kick in?</TD></TR></TABLE>
well i take it your car is still obd 0 so here is what is wrong: obd 0 jdm computers will not let you go into VTEC unless your VSS is working and you are going faster than 20mph. Fix this and i guarantee your car will go into VTEC (as long as it is wired right ). also vtec is rpm activated . if your speed, rpm, oil pressure are not within spec, it will not go into VTEC. btw get a skunk2 manifold to get rid of your butterfly problem or do an obd1 conversion and run a obd1 p72 ecu. I reccomend you do both though

 

the code that im getting VSS, is that a 2 part problem. is it an actual sensor thats messed up, or just the fact that my speedo cables fucked up. cuz i plan on replacing the speedo cable tomorrow and in doing so should fix all problems right....

 

Speedo cable doesn't have anything to do with VTEC. Replace your VSS and the problem will go away. Replacing just the speedo cable won't fix anything.

The P72 ECU DOES control VTEC, as it was designed for a GSR engine.

Lastly, the IAB's (the butterflies in the intake manifold) will stay fully open when you aren't using a GSR ECU (P72).

 

yes...your mph do not matter when vtec engages. I've used a b16a jdm p30 on my 94 gsr w/ the stock gsr intake manifold. You should be able to hear vtec at 5700 even with the stock manifold. I believe your secondaries stay open all the time since the b16a ecu is not meant to control the secondaries in the stock intake manifold. You should be able to rev past 8000 rpm, but since your car is throwing a cel, your ecu automatically sends it into limp mode, thus....NO POWER! Also, if you do plan on using the b16a ecu with your stock gsr motor/intake manifold...then expect some losses in hp and torque.

 

in order for VTEC to kick in doesnt it rely on 3 things, RPM,Speed and oil pressure. so speed would be a factor. and to future my point installed the new speedo cable and no more CEL. yet,still not sure if VTEC is working. at 5,000 still cant tell if it is kicking in. you should beable to feel it kick in correct?

 

i take that back VTEC is working and i can def. till when it kicks in at 5,000

 

i have the same problem, im using a p72 and my speedometer isnt working and my CEL is on is that why my vtech doesnt kick in??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by liquidxEG &raquo;</TD></TR><TR><TD CLASS="quote">Speedo cable doesn't have anything to do with VTEC. Replace your VSS and the problem will go away. Replacing just the speedo cable won't fix anything.

The P72 ECU DOES control VTEC, as it was designed for a GSR engine.

Lastly, the IAB's (the butterflies in the intake manifold) will stay fully open when you aren't using a GSR ECU (P72). </TD></TR></TABLE>

bulshit
example i had a customers car come in friday of last week 2000 gsr full greddy turbo kit and he bitching because after he changed his cluster out his gluster wasent working plus vtec wasent kicking in so

i replaced the cable and boom guess what all hell broke loose at 4500 rpm

 

yea with the speedo in the **** kicks right in. but somethings up with the intake manifold though, how with the b16 ECU that im using it wont open the secondary butterflys. so im not getting as much power as i should be. but you can just remove them correct