So...I have a '98 GSR and it bogs pretty bad when the car is warm (normal operating temperature) and I push the car to wide-open throttle.

The car is basically stock. I did a slight rebuild about 3000 miles ago...the only thing different I put in are JDM ITR pistons...I did not touch the head (it is a stock OBD2 GSR head). Only other things I have on the car are Ebay short ram, headers, and ebay cat. I have checked the timing and it is on...however, I did advance the timing just by turning the distributor and it is not bogging as bad as it was before I advanced the timing. The car is also eating a lot of fuel. I'm thinking this could be a fuel problem, but not sure of exactly what part of the fuel. Spark plugs and wires are new, distributor cap and rotor are new, starter is new, fuel filter is less than 6000 miles.

Please help me out guys...Thanks!

 

Anyone? Please help?!?

 

get it tuned...running itr pistons is different then running gsr pistons

 

Even if you were to have just bolt-ons on a stock GSR motor, the car bogs as well. In this case, with ITR pistons, you definitely need to get the car tuned!

Get with a tuner and get it done. It'll be a different car afterward. You wont regret it.

 

Check and ajust the valves if not done so. Could be that.

 

tune, sounds like ignition timing....

 

i went through the same thing and i had to replace my dizzy and redo timing you deffinately need a tune though .. thats what i did when the other things helped ,but didnt fix it

 

You altered the compression to 11:5 or so!! and that changes everything! your ecu will not be able to compensate fuel so its most likely runiing rich you must get it tuned and with some type of software crome hondata ect. thats your problem you will mess up your motor driving untuned! and why put those pistons and not upgrade your valve train at least!

 

I was hoping to try to avoid getting it tuned because I don't have the cash right now, but I guess if that's what I have to do, then I must... I did some research on this before I dropped the itr pistons in and most people said it was a direct drop in with no other major modification?

 

Who ever told you that pour some baby powder in your palm and smack his *** so hard his mom feels it!
ive replaced my gsr head with a b16 head and it drove real strong untuned with bolt ons (poor mans type r) but putting in bigger higher comp. pistons will need a break in for one! and a dyno tune second. unless your replacing the blocks piston with the same type piston/compression and just going over bore a little because of the hone you might be able to drive it as is because it will be almost still identicle except that you will need to still break in the block, just put some more mods on and get it all tuned!