is there any legitimate reason? assume it's a vtec motor with itb's.....

 

if u have a B series motor, then the P72 has fuel and ignition mapping for it. P28 has tables for a SOHC motor. it dont matter too much, but if i were u, i would get a OBD1 P28 or P72, socket it and run CROME for their ITB support

 

I've already got a socketed and crome tps mapped p28.

I've already got a socketed and crom tps mapped p72.

I was thinking of maybe using the p72 just for the fact that it has a knock sensor and I could possibly use that for my datalogging/ tuning - especially with my high compression setup that I'm building.....

 

the knock sensor isn't quite useless, but damn close. If you have a built motor, it's damn useless. The knck sensor is tuned for a rather specific noise, and if you do too much to change that (forged pistons, difference in bore in particular) it ceases to be useful. The reason to use a P72 is for the extra output (IAB) but it's a non-issue with ITBs.

 

And if you have big cams, you may want to get+install ITB tools plus. It's a little OTT in terms of column resolution, but having the extra rows is making a huge difference on the car with Pro1s I'm working on.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blundar &raquo;</TD></TR><TR><TD CLASS="quote">And if you have big cams, you may want to get+install ITB tools plus. It's a little OTT in terms of column resolution, but having the extra rows is making a huge difference on the car with Pro1s I'm working on.</TD></TR></TABLE>


I believe johnzm used itbtools+ on cromepro for the base map he burned for me.

 

good luck, and rememeber to use the force. Don't be afraid to feed the ****** fuel either. ITBs are very peaky

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blundar &raquo;</TD></TR><TR><TD CLASS="quote">good luck, and rememeber to use the force. Don't be afraid to feed the ****** fuel either. ITBs are very peaky</TD></TR></TABLE>


haha, I am very concerned re: running out of fuel.....!

 

it wouldsnt really matter what ecu you went with on account you need a p30 base for itb tools ? right

 

imo use which ever you have on hand and is cheaper, beucase in the end they both are pretty much the same thing. seeing as you have both, i'd do a coin toss

 

id keep the p28 and sell the p72..they seem to have a better resale value

 

ITB's love fuel. When we converted from a IM to TWM's I had to add shitloads...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .nate &raquo;</TD></TR><TR><TD CLASS="quote">ITB's love fuel. When we converted from a IM to TWM's I had to add shitloads...</TD></TR></TABLE>AGREEEEEED!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blundar &raquo;</TD></TR><TR><TD CLASS="quote">the knock sensor isn't quite useless, but damn close. If you have a built motor, it's damn useless. The knck sensor is tuned for a rather specific noise, and if you do too much to change that (forged pistons, difference in bore in particular) it ceases to be useful. The reason to use a P72 is for the extra output (IAB) but it's a non-issue with ITBs.</TD></TR></TABLE>

Yeah. I seem to be logging "knock" at half throttle with my setup now. 11.3:1 comrpession with some pretty large cams. USDM ITR pistons though. I put in some 110 octane and STILL logged the same amount of knock.. I think that the knock sensor tends to pick up "engine noise" a little more then anything else at this point. I agree that it is somewhat useless at this point.