I installed type R pistons in my b18b and dont feel much of a difference except for a litle more pull at top end. Did anyone else do this what else can i do to feel a litle more power but oem parts.

 

More aggressive cams would help I'm sure. VTEC head. 94 octane. New tune? I'm sure someone else will know more.

 

If your going to make any significant change like that, it's always important to tune aftarwards. Right now, your running higher compression on a fuel map that wasn't intended for that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Haleiwa-Brando &raquo;</TD></TR><TR><TD CLASS="quote">If your going to make any significant change like that, it's always important to tune aftarwards. Right now, your running higher compression on a fuel map that wasn't intended for that.</TD></TR></TABLE>

i agree. get it tuned and give us an update.

 

More aggressive cams, a quality header and exhaust, and proper tuning will help you realise greater gains. You can't expect to simply drop-in some pistons and achieve a large power increase.

 

I put in JDM type R pistons in my 95 LS and noticed good gains everywhere in the rev range. Before I put the pistons in my car already had an intake, header, and exhaust so apperently that helps? Obviously run the highest octane gas you can get.

Curious, regarding the tuning, can someone point me to a dyno chart that has curves before and after tuning when simply pistons are changed?

Second question, to tune for this type of change would the ECU need to be changed or can the fuel pressure be adjusted?

Good luck bud!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mdhimes &raquo;</TD></TR><TR><TD CLASS="quote">I put in JDM type R pistons in my 95 LS and noticed good gains everywhere in the rev range. Before I put the pistons in my car already had an intake, header, and exhaust so apperently that helps? Obviously run the highest octane gas you can get.</TD></TR></TABLE>

Not necessarily. To run say...race gas you need a significant amount of compression. Around 12.5:1 and up. 92/93 Octane, I would say that it's threshold is around 12.5:1...but that is risky business running pump gas on that high of a compression.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mdhimes &raquo;</TD></TR><TR><TD CLASS="quote">Curious, regarding the tuning, can someone point me to a dyno chart that has curves before and after tuning when simply pistons are changed?</TD></TR></TABLE>

Not that I know of, search the all motor section.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mdhimes &raquo;</TD></TR><TR><TD CLASS="quote">Second question, to tune for this type of change would the ECU need to be changed or can the fuel pressure be adjusted?</TD></TR></TABLE>

The ECU will always need to be changed if you do anything like that. Your stock ECU will support your simple bolt on stuff, but once you mess with the head or the block, it will no longer be sufficient. You need to determine what ECU you need, chip it and run something like Crome Pro on it. Crome pro will also allow you to adjust the fuel pressure.

 

ok i just got a chrome pro install on ecu and feel a huge difference the power is felt throught the entire RPM wide span and definitely feel the difference

 

what can I do to the rotating assembly meaning rods and crankshaft oem wize.