Safe amount of boost on KA24DE - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SSJ2Gohan · 07-22-2002, 08:49 PM

Im looking to go the turbo route on my KA24DE as opposed to the SR20DET route.

As said in my other post im looking at the Nsports kit.  Im wondering how much boost the KA24DE can take before needing upgraded rods and pistons.

Tyler Durdan · 07-23-2002, 12:17 AM

7 psi from what I've heard.

*sykikchimp* · 07-23-2002, 08:38 AM

With a T3/T4 (most commonly used turbo on KA)

4 psi before you need fuel managment
7 psi w/ RRFPR
~14 psi max on Stock internals WITH proper fuel management.

Stock internals are good to about 300+hp with good tuning on a healthy engine.  The Pistons are the weak point.. they are Cast, whereas the Rods, and Crank are forged.

misnomer · 07-23-2002, 03:58 PM

Check

Which model 240 is this engine in? I have been told only the 95+ have forged rods. Anybody know about this?

SSJ2Gohan · 07-23-2002, 08:59 PM

It sounds like forged are good.  Im looking to replace both rods and pistons anyways (which if SOMEONE has a link to this Id really like it <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt='

'> )

I have a 1995 240sx SE if that helps.

*sykikchimp* · 07-23-2002, 10:38 PM

All KA engines have forged rods.

BlackFox · 07-24-2002, 11:48 AM

If you replace the  pistons and rods and get the compression ratio down to 8.5:1 And with the proper fuel, ecu, exhaust, etc.... 20psi shouldn't be a problem. Few guys on the board have pretty crazy KA-T setups. That's the route I'm going.

If you don't want that much boost. You could save yourself some bucks and get the rods cold forged or something like that to make them stronger (I went into how this works in a post a few months ago, I can tell it again, but unless you took a materials engineering class you're not going to understand it)

07-22-2002, 08:49 PM	#1
SSJ2Gohan Leaky Injector Join Date: Feb 2002 Posts: 149 Trader Rating: (0) Feedback Score: 0 reviews	Im looking to go the turbo route on my KA24DE as opposed to the SR20DET route. As said in my other post im looking at the Nsports kit.  Im wondering how much boost the KA24DE can take before needing upgraded rods and pistons. __________________ Kamehameha!

07-23-2002, 12:17 AM	#2
Tyler Durdan Zilvia Junkie Join Date: Feb 2002 Location: Don't mess with Texas Posts: 546 Trader Rating: (0) Feedback Score: 0 reviews	7 psi from what I've heard. __________________ "Pure adrenaline attached to a license plate.  Isn't it time to experience one yourself?"                           -Dan Gurney Turbo for Sale

07-23-2002, 08:38 AM	#3
sykikchimp WOW addicted Join Date: Dec 2001 Location: the moon Age: 44 Posts: 6,525 Trader Rating: (0) Feedback Score: 0 reviews	With a T3/T4 (most commonly used turbo on KA) 4 psi before you need fuel managment 7 psi w/ RRFPR ~14 psi max on Stock internals WITH proper fuel management. Stock internals are good to about 300+hp with good tuning on a healthy engine.  The Pistons are the weak point.. they are Cast, whereas the Rods, and Crank are forged. __________________

07-23-2002, 03:58 PM	#4
misnomer Nissanaholic! Join Date: Jul 2001 Location: Nevada Posts: 2,293 Trader Rating: (0) Feedback Score: 0 reviews	Check Which model 240 is this engine in? I have been told only the 95+ have forged rods. Anybody know about this? __________________ Rowsdower saves us and saves all the world!

07-23-2002, 08:59 PM	#5
SSJ2Gohan Leaky Injector Join Date: Feb 2002 Posts: 149 Trader Rating: (0) Feedback Score: 0 reviews	It sounds like forged are good.  Im looking to replace both rods and pistons anyways (which if SOMEONE has a link to this Id really like it <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=''> ) I have a 1995 240sx SE if that helps. __________________ Kamehameha!

07-23-2002, 10:38 PM	#6
sykikchimp WOW addicted Join Date: Dec 2001 Location: the moon Age: 44 Posts: 6,525 Trader Rating: (0) Feedback Score: 0 reviews	All KA engines have forged rods. __________________

07-24-2002, 11:48 AM	#7
BlackFox Zilvia Junkie Join Date: Feb 2002 Location: San Jose, CA Posts: 534 Trader Rating: (0) Feedback Score: 0 reviews	If you replace the  pistons and rods and get the compression ratio down to 8.5:1 And with the proper fuel, ecu, exhaust, etc.... 20psi shouldn't be a problem. Few guys on the board have pretty crazy KA-T setups. That's the route I'm going. If you don't want that much boost. You could save yourself some bucks and get the rods cold forged or something like that to make them stronger (I went into how this works in a post a few months ago, I can tell it again, but unless you took a materials engineering class you're not going to understand it) __________________ Current Cars: 1976 Mercedes Benz 300D 1995 240sx SE aka Kate (winner: Best Stock S14 @ 2002 National Convention) http://community.webshots.com/user/jeff976cal If you're interested in parts email me [email protected]