HEY GUYS I JUST PUT IN MY JDM p73 and wow!...Vtec engagement is alot more noticable but with the p72 i had more power between 4500 rpm and 5600 rpm..soo i don't know if im losing time or gaining time. reason why i did this is because im getting a sk2 IM later on. but what i really want to know is with the type R i know im running rich....but would running rich so besides wasting gas will it damage my motor?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lauj87 &raquo;</TD></TR><TR><TD CLASS="quote">HEY GUYS I JUST PUT IN MY JDM p73 and wow!...Vtec engagement is alot more noticable but with the p72 i had more power between 4500 rpm and 5600 rpm..soo i don't know if im losing time or gaining time. reason why i did this is because im getting a sk2 IM later on. but what i really want to know is with the type R i know im running rich....but would running rich so besides wasting gas will it damage my motor?</TD></TR></TABLE>

So you're still running a B18C1 IM with the P73? If so you're not getting IAB activation from it. You're loosing power at the top from that.

Do you mean you had more power from 4500-5600 before you put the P73 ECU in? Again, if you're still running the B18C1 IM, the VTEC engagement from the P73 at 5700-ish is way too late for that manifold, which is costing you that power. I'd recommend you go back to the P72 until you get the Skunk IM, just for the sake of your powerband. Also, don't forget that the P73 gives you a couple hundred rpms before fuel cutoff than the P72. Can your valve train keep up?

As for the P73 running you rich, if it does, I'd doubt it would be by much. It shouldn't hurt anything, depending on actual air/fuel ratio. Better a little rich than lean but too much either way isn't good either. If it is too rich though, damage could be done to the catalytic convertor.

 

The vtec feels like it engages harder because you are losing more power before vtec than your stock ecu. Unless you have mods to warrant using that ecu go back to your p72.

 

hahaa yeah im going to go back to my stock ecu soon but i like the feel of this one..soo imma drive with it just till i get tired of it :-D

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kchungb17a &raquo;</TD></TR><TR><TD CLASS="quote">So you're still running a B18C1 IM with the P73? If so you're not getting IAB activation from it. You're loosing power at the top from that. </TD></TR></TABLE>

Without the signal from the ECU, the secondaries should actually be open all the time, so he'd be sacrificing power in the low RPM range, not high. I do agree that it's best to stick with the stock ECU at this point until the modifications warrant switching to the ITR ECU.

 

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

Without the signal from the ECU, the secondaries should actually be open all the time. </TD></TR></TABLE>


really? i thought they would be close!?

 

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

Without the signal from the ECU, the secondaries should actually be open all the time, so he'd be sacrificing power in the low RPM range, not high. I do agree that it's best to stick with the stock ECU at this point until the modifications warrant switching to the ITR ECU. </TD></TR></TABLE>

Really?... Is that on OBD2 thing?

 

No, it's simply a result of how the secondaries function. The manifold is set up so that the secondaries are normally open (held that way by a spring). When the car is started, power is sent by the ECU to a solenoid which in turn directs vacuum to a diaphragm that closes the secondaries. Once the ECU determines that the secondaries should be open, it cuts power to the solenoid (sources I've seen actually indicate that it's the solenoid's groud that is being interrupted, but the principle is the same either way) and the secondaries then open. If there is no being power sent to the solenoid by the ECU or if there is no vacuum to the diaphragm, the secondaries will remain open at all times.

 

I stand corrected (again). Thanks for straightening it out. I believe the difference between the ground vs power activation depends on whether it's OBD1 (ground) or OBD2 (power).

 

OooOoO that would explain why my intake is noticeably louder in the lower RPM'S

 

soo when the spring is in the down position that means the IAB's are open?