I see the 62mm one rsm racing has and just wondering if its worth it?

Any input or advice, I read the FAQ and know what they do but for performance is this the best size?

56mm is said to be one of the best sizes for the LD9, atleast in N/A tune

Topsub wrote:I see the 62mm one rsm racing has and just wondering if its worth it?

Any input or advice, I read the FAQ and know what they do but for performance is this the best size?

Ender_Wiggin wrote:56mm is said to be one of the best sizes for the LD9, atleast in N/A tune

I can vouch for that. I have the RSM 62mm, and at 170-180HP N/A it's definitely overkill. Now if you plan on going S/C or Turbo in the future, the 62mm's really gonna shine and you might as well get it now and take the low-end hit it'll give you while you're still N/A.

You'd think the larger bore of the 62mm would be an advantage versus the 56/57mm TB's, but that's not the case for N/A. A couple bad things the 62mm does N/A are 1) it decreases the velocity of the air entering the motor, which may make the car feel weak, unresponsive, and gasping for air in the low RPM's, and 2) it shifts the effective range of your power band way up in the high RPM's (4500+ RPM) and the best chunk of power it makes we can't even reach because it's past our rev limiters. Chances are you don't get to 5000/6000RPM's in daily driving, more like 3000RPM +/-, so like me, you won't even get to take advantage of the extra power until you get the odd chance to wind the car all the way out. The 56/57mm TB's give you a sweet amount of power but also spread more evenly throughout the RPM range, so it's actually useful to you.

Conclusion: Staying N/A - 56/57mm is best, Going S/C or turbo - 62mm would be great.

Hope that helped. Sorry I talk so much

LD9 Fury (The JBO Viking) wrote:

I can vouch for that. I have the RSM 62mm, and at 170-180HP N/A it's definitely overkill. Now if you plan on going S/C or Turbo in the future, the 62mm's really gonna shine and you might as well get it now and take the low-end hit it'll give you while you're still N/A.

You'd think the larger bore of the 62mm would be an advantage versus the 56/57mm TB's, but that's not the case for N/A. A couple bad things the 62mm does N/A are 1) it decreases the velocity of the air entering the motor, which may make the car feel weak, unresponsive, and gasping for air in the low RPM's, and 2) it shifts the effective range of your power band way up in the high RPM's (4500+ RPM) and the best chunk of power it makes we can't even reach because it's past our rev limiters. Chances are you don't get to 5000/6000RPM's in daily driving, more like 3000RPM +/-, so like me, you won't even get to take advantage of the extra power until you get the odd chance to wind the car all the way out. The 56/57mm TB's give you a sweet amount of power but also spread more evenly throughout the RPM range, so it's actually useful to you.

Conclusion: Staying N/A - 56/57mm is best, Going S/C or turbo - 62mm would be great.

Hope that helped. Sorry I talk so much

Thats just what i wanted to know!!!

I saw teh 62mm is around 400 bucks

Right now i will have alot of bolt-ons do you know a good place to buy a 56mm body? IS there anything else i need or is it a directy swap?

This thread should answer questions on the install procedure:
http://www.j-body.org/forums/read.php?f=2&i=337816&t=337816#337816

awesome thanks..

you can have your stock TB bored out. be cheaper then buying one
on a 2.4, the opening in the intake manifold is roughly 59 mm. so bore out your TB to 59mm and there be hardly any bottle neck there.



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