Compression JDM vs. USDM

[Bobby BUdds]

I noticed the compression on all JDM engines is a tad higher then the USDM. Now since I'm looking to do a turbo build should i be getting a usdm engine? I'm planning on sleeving the block and having compression lowering pistons in there. So what I'm getting at is since I'm using the compression lowering pistons, does it matter if i get JDM or USDM. Thanks

[Snoopy]

if you're going to rip the internals out anyway, save yourself a little $$ and go with the cheaper engine. which is usually the usdm.

[Bobby BUdds]

I was told by the guy at honda(I don't believe him fully) that the jdm gsr transmissions have a shorter gear ratio which he told me makes a huge difference. Is this true or misinformation? I am getting tons of misinformation from people in real life, so i always come here to verify it or not. Thanks again.

[Snoopy]

Originally Posted by Bobby BUdds

I was told by the guy at honda(I don't believe him fully) that the jdm gsr transmissions have a shorter gear ratio which he told me makes a huge difference. Is this true or misinformation? I am getting tons of misinformation from people in real life, so i always come here to verify it or not. Thanks again.

usdm and jdm gsr gear ratio's are the same. although the jdm had lsd as an option.

[Bobby BUdds]

What is lsd and does it give performance increase?

[Sirfallsalot243]

LSD- Limited Slip Differential.

If you dont have LSD, have you noticed that in a burnout only 1 wheel will spin? This is because your tranny puts power to the wheel with the least amount of traction. If youre stuck in the snow with 1 wheel spinning, youre getting power to the wheel with no traction. LSD allows power to go to the wheel that has traction, to essentially create a 2 wheel burnout. I kind of compare it to "posi-rear" that has a live axle spinning both wheels. The difference is with posi rear that both wheels spin at the same speed. When cornering, the outside wheel is supposed to spin faster than the inner, and posi-rear doesnt allow for that (so its mainly just for drag). LSD still allows the inner and outer wheels to spin at different speeds, while putting power to both wheels, instead of "skipping" around a turn. As far as performance gains- it wont make you have more power, but it will make you faster.

[Sirfallsalot243]

And per your first post- since youre ripping out the internals anyway, just get whichever motor is cheaper. It makes no difference, as the compression difference is due to the pistons- which you wont be using.

[Snoopy]

Originally Posted by Sirfallsalot243

And per your first post- since youre ripping out the internals anyway, just get whichever motor is cheaper. It makes no difference, as the compression difference is due to the pistons- which you wont be using.

is there an echo in here?

Originally Posted by Snoopy

if you're going to rip the internals out anyway, save yourself a little $$ and go with the cheaper engine. which is usually the usdm.

[Sirfallsalot243]

Originally Posted by Snoopy

is there an echo in here?

I didnt even read your post. Whoops, I guess youve got it covered.

Never hurts to reiterate though right?

[Bobby BUdds]

thanks both of ya =D