Well, I recently found out that I need new rings for my GSR. So, I decided that I would put new pistons in while I have the motor apart.
Seeing that I am on a budget I am going with RS machine's CTR pistons on stock rods. I also have a blockguard.

My questions:
1. Would I be able to run just the CTR pistons for a while until I can tune it or will it run crappy?

2. Will I need to upgrade any other parts in order to have the motor run fine?

3. Will this setup require advancing/retarding the timing?

4. How would I know if I will have clearance issues?

Any other helpful information would be greatly appreciated!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SL0-hatch &raquo;</TD></TR><TR><TD CLASS="quote">Well, I recently found out that I need new rings for my GSR. So, I decided that I would put new pistons in while I have the motor apart.
Seeing that I am on a budget I am going with RS machine's CTR pistons on stock rods. I also have a blockguard.

My questions:
1. Would I be able to run just the CTR pistons for a while until I can tune it or will it run crappy?

2. Will I need to upgrade any other parts in order to have the motor run fine?

3. Will this setup require advancing/retarding the timing?

4. How would I know if I will have clearance issues?

Any other helpful information would be greatly appreciated!</TD></TR></TABLE>

1. CTR pistons in a GSR motor will have a high CR. Go with RS Machines ITR pistons .25mm or .5mm overbore and a hone. It will not run as good as it should without a tune.

2. I would upgrade my rod bolts to some ARP rod bolts. Cheap insurance.

3. Retarding your timing will help prevent detonation until you get a tune.

4. Clay the motor if you don't have the tools to do it the otherway.

Good luck

 

thanks for the advice/help!

any others...

 

both of the suggested pistons will have compression fairly high by the time you cut the head. rather than blow money on a cast piston that will have 11:5-1 compression or more there is a better alternative since you're doing an overbore anyway. spend the $380 on a matched set of the forged 4032 alloy mahle pistons. the piston to wall can be ran as tight as cast at .0025 or .003 and they are 40g lighter than type r slugs. the dome is also smaller on the 10:5-1 piston and normally creates 10:7-1 compression after the head is resurfaced.

 

thanks for your input! ill look into it!

 

any other info/help?

 

how cheap were you planning on going? if i remember right the RS pistons are JDM type r domes which brought the compression higher than i wanted to go on a p72 head, especially after decking the block and head. a couple things to look at are: the cams you run. longer duration is compression friendly. stock GSR cams would scare me more at 11:1 than your typical stage 3 ever would at 11:5-1. the tune also influences this since timing can get played with. if you have a stock ecu and stock cams i would really try to keep the compression around the 10:5-1 to 10:8-1 level. let us know what you can spend and what cams & ecu you will be running.