Maybe I'm wrong but on a P72, IAB soleniod activates at 5800 rpms...

I know for a fact IAB solenoid activates on a P13 (91-96) at 4600, and 4800 on a P5M (97-01)

So I deem the IAB control on the P72 useless, and detrimental to your engine performance.

Here's the IR graph of a P13 vs a P72 on an H22a


the p72 enagages VTEC at 4400...with the IAB's closed....look at the power nosedive...incidentally when the IAB's open at 5800....the power curve surpasses the p13....

P72 IAB control is junk for the H22a. Discuss.

 

vtec engagement is too early.. take a v-afc and bump vtec cross over to that of the p13 and redyno.. if the graph is more like the p13 in mid but still keeps that higher top end.. that would be nice...

-Mike

 

Regardless of the VTEC crossover...it's the IAB's being closed that is killing the power, that's my argument anyway....

 

is there no way to change the iab point on the p72?

if not i guess youll have to dyno w/the open the whole time, then closed the whole time. where the graph's cross is the best point for activation. this can be controlled using an msd or similer controller.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fastludeh22 &raquo;</TD></TR><TR><TD CLASS="quote">is there no way to change the iab point on the p72?

if not i guess youll have to dyno w/the open the whole time, then closed the whole time. where the graph's cross is the best point for activation. this can be controlled using an msd or similer controller.</TD></TR></TABLE>

Right. It's not adjustable, an MSD rpm switch or something would work.

I run a custom P72...but my IABs are open all the time, because this function will kill the motor...

 

I doubt its the IABs because I'm seeing the P72 pass it up around 6400rpm. I would like to know exactly what it is thats getting that extra top end out of the H22 though.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4bidden &raquo;</TD></TR><TR><TD CLASS="quote">I doubt its the IABs because I'm seeing the P72 pass it up around 6400rpm. I would like to know exactly what it is thats getting that extra top end out of the H22 though.</TD></TR></TABLE>

It crosses at 6000....but the reason for the higher peak is mostly less fuel, same sort of results you can get with a V-AFC.

 

Hondata allows adjusting IAB opening, IIRC.

 

ill second the hondata allows it thought at least if you use the latest version of romeditor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by satan_srv &raquo;</TD></TR><TR><TD CLASS="quote">Regardless of the VTEC crossover...it's the IAB's being closed that is killing the power, that's my argument anyway....</TD></TR></TABLE>

I'd say leave them open all the time, loose the gas milage and low end, and get the midrange back.

The power curve should be pretty much cought back up at around 4800.

Something is weird about that P13 dyno though. I've never seen HP drop at VTEC engagement AT ALL on a stock ECU with stock cams. It usually jumps up.

 

ask some of the teg guys to get in on this post. I bet they know something we don't.

 

oh, my wild guess is maybe theres a big difference in cams between the 2 engines *shrugs* anyone got a dyno of a teg motor with a p13?

 

lol, dyno is of a H22 w/ P13 ecu and the same motor with P72 ecu. Read before you post..

-Mike

 

does the p72 just run way leaner on top end because its designed for a 1.8lt motor? or does it adjust the fuel based on map sensor readings or something else. cause that top end is real nice on that dyno, but if its just pulling fuel, then i guess reliability would be an issue if it ran too lean.
marsh

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM BB2 &raquo;</TD></TR><TR><TD CLASS="quote">lol, dyno is of a H22 w/ P13 ecu and the same motor with P72 ecu. Read before you post..

-Mike</TD></TR></TABLE>

yeah no **** sherlock. the p72 is a teg ecu right? what i was saying is the dip could be because the p72 was designed for an engine with different cams then the h22. stop being a ***** and get back to installing your apc euro tails.

 

Hello, this might be a little off topic, but how much hp do you think the IAB produces, or free up?

 

why are you comtemplating on junk ecu's...

p28 with hondata s200 tuned. none of that BS... before i used to care, now with hondata i don't ....

stand alones rule... get an s200 and a euro-r and call it a day. i did and man what a difference from another h22a !!

 

i am going to use hondata 4b for engine management, so now i accutally got all 3 ecus in position as of right now, and i chose the p28 and ditching the other 2, anyone wanna buy a obd1 p13 or obd1 p72???

 

you can keep the IAB with a chipped p28 also....i went with a normal chipped p28 though....it DOES lose bottom end power, but from what i've read, the IAB crossover is at 5500-5700rpm...after the vtec crossover....and vtec crossover with stock cams work best at 4700rpm.....

 

anyone dyno a upgraded p72 and p13 side by side before? i don't want to see the graph from import review, i want to see from someone that have done it them self, and has anyone dyno a p72 with the iab open and close? to see if using the iab will give a better power range or just leaving the iab off will give it a better power range? anyone please repones