Turbo strategies for the KA24DE

[cheater240]

Got a couple questions about the KA24DE...

What are realistic boost limits for the KA24DE 91-94 and then 95-98?  What piston upgrade was made in 95?  Did Nissan go to a hypereutectic cast piston?

What aftermarket piston options exist?  I have seen the JE Pistons for about $550!!!  Come on!  And you HAVE to use the Carillo rods ($600!!!!!)  Got to be a better way...

[cheater240]

No one gonna tackle this?  Who has a turbo KA24DE?

[West]

91-94 240SX can only handle about 6-7psi with stock internals.

95-98 can handle 10-11psi on stock internals.

There arent many options on Rods and Pistons for the KA because there is no demand. Check to see if Crower makes anything for our cars. Also, GT Pro / Ross makes Rods and Pistons for our cars but I have seen them for like $750. Bottom line is, you want a nice turbo KA, your gonna be spending the $ to play.

[cheater240]

You're not kidding about paying big to turbo the KA!  I have seen crower rods as well~$550!  Oh well.

I suppose another option would be to install a thicker head gasket and decrease comp. ratio.  That would allow either more boost or safer 7 psi boost in my '91.

Anyone know of a company that sells a thick copper head gasket for the KA?  I think www.paeco.com might, but I have not talked to them.

[West]

JWT sells some good stuff by Arias. I am going to get stuff from them when I build my KA. I have forged factory pistons in there now.

I have never seen a thicker gasket for the KA although that dosent mean they dont exist. Talk to either HKS or JUN.

[cheater240]

Forged factory pistons, huh?  Doesn't get any better than that, at least not from the factory.

Is this what the '95 and up KA's had?  What did the '91-'94 engines have?

[West]

They dont come Forged stock. I had them forged on my setup.

[drifterx]

check out new issue of Super Street
it has 4 S14 KA24DET

[cheater240]

Hey West--so where did you get these forged factory pistons?  Are they teh JE pistons?  Aria pistons?

Is this your secret superpower?--knowing where to get forged pistons for teh KA? ;-)

[West]

They are the Factory Pistons from Nissan, only they have been forged with cryogenics. Its not my secret power superpower yet <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>

[cheater240]

&quot;forged with cryogenics&quot;<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'> &nbsp;Cryogenically treating something is one thing (bringing the material to a different molecular state, letting the molecules reallign, etc.), forging is a totally seperate thing (forming hot metal into a particular shape)

So I'll assume your's were cryogenically treated. &nbsp;If so, mind answering some questions?

-How much boost do you feel comfortable running on those? &nbsp;
-What company did the process?
-Did installing these require any block machining?
-How much? <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=';)'>

[West]

Well dont I feel stupid <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>

I dont know to much about it because the old owner had this done to it. And he dosent know shit really. I will try to get ahold of the mechanic to find out some of your questions because I need to know too.

I think I can run at least 15psi. I have only gone up to 13psi. or .89 bar. I need a better way of boosting though. Apexi AVC-R's are junk. So my solutions is a stand alone ECU so I can do some MAJOR tuning <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>

[cheater240]

Sorry to step on toes.. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>

This is the kind of thing that makes more economic sense instead of buying forged pistons. &nbsp;I would appreciate knowing where this process was done. &nbsp;Sounds like teh way to go for moderate (10-15 psi) boost.

Stand alone ECU?! Now you're talking! &nbsp;I had some experience tuning a Motec ECU in college. &nbsp;That one is big bucks. &nbsp;I'd like to hear how it goes if you install and tune the thing.

[HaloZ]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from drifterx on 8<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wow.gif" border="0" valign="absmiddle" alt=':0'>7 pm on July 10, 2001
check out new issue of Super Street
it has 4 S14 KA24DET

</td></tr></table><span id='postcolor'>
3 &nbsp;KA's a 1 SR.

[drifterx]

ohh i cant read ok?
well i ahve not had time to read it yet

[cheater240]

What does the AVC do? &nbsp;Control boost? &nbsp;

Besides the turbo hardware, what steps are taken on your car for fuel tuning? &nbsp;Do you have a piggy-back fuel tuner (like the Apex AFC)? &nbsp;Do you know anyone that has experience with this unit?

This has always scared me away from turbocharging. &nbsp;How to tune the thing? &nbsp;I don't like the idea of the Vortech FMU. &nbsp;All it does is raise fuel pressure proportional to boost. &nbsp;So, if bosst goes up 1 psi, fuel pressure increases 8 psi. &nbsp;Seems very inaccurate.

Seems like the piggy-back controllers are the best bang for the buck.

Turbo guys, how do you tune?

[wav399]

What about the kit that NSport sells?

Be careful when you are boosting however. Just because it reads .89 bar, doesnt mean your boosting that all the time. Boost spikes will send your boost levels up higher, but it doesnt sustain that level, it comes back down very fast. Personally I wouldnt run over 11-12 psi even on a built motor, the walls of the ka are just too thin IMO. When I say that, I mean 11-12 CONSISTENTLY where your car boosts at that level throughout the entire rpm range. The avc-r is a digital boost controller that allows you to control your boost based on rpm and autolearn if you so desire. IMO, I would rather get hte greddy profec b if you want a cheap elecronic boost controller or the new blitz boost controller that can be combined with the blitz dynomometer to control boost based on speed/hp. Anyone that has any upgraded fuel system NEEDS an afc or something of the like to regulatge their fuel ratios. The only bad thing about your ecu's is that they are just predefined and are not ODB where you can plug in a datalogger and see what your ecu is doing. I recommended to WeST to go with the TEC II for his car as a standalone system, because after you add up the prices of the avc-r (500), afc (300), and ITC (340), you are very close to the standalone itself, which offers much more flexibility and control over piggybacking. Without a knock sensor or a datalogger, you really have no idea if you are hurting your engine or not from too much boost or not enough fuel, and that is the most critical complication I see with 240's in general that are turboed.

[cheater240]

Well, I found the web site of Diversified Cryogenics. &nbsp;Tells a lot about the process and improvements. &nbsp;Cheap too! &nbsp;About $8 a piston.

EUREKA! &nbsp;I've found the answer! &nbsp;Thanks Mark!

[cheater240]

So with the $50 you can put into having pistons cryogenically treated, you are on your way to a robust turbo KA; maybe up to 12 psi of boost. &nbsp;I'm not sure why you would even want to replace the rods; the rods and the crank are both forged steel.

[cheater240]

So with the $50 you can put into having pistons cryogenically treated, you are on your way to a robust turbo KA; maybe up to 12 psi of boost. &nbsp;I'm not sure why you would even want to replace the rods; the rods and the crank are both forged steel.

[PSI240SX]

I have experience with the apex S-AFC, it blew my motor!!!! I had my cusom turbo kit for 1 year 3 months, no problems, 30 minutes after installing and adjusting the S-AFC, my number 3 piston melted! Guess you need Mr. Apex in the passenger seat to tune it for you.

[Art]

8 bucks a piston, is that right?<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>? &nbsp;will that give you any immeadiate horespower or is it just a safety net?<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>

if the subject, I have a question. &nbsp;Everytime i let off the gas or brake the revs go done to like 500 and then jump back up to idle, what's up with that?<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>


I'm just gonna start working on my 240. defenitely looking to go turbo.

[S13Grl]

Where is this company located and how would I go about doing work with them?

[whateverjames]

14310 Ewing Ave. S. Suite 100
Burnsville, MN 55306
http://www.diversifiedcryogenics.com i guessed the website address. hey people, i asked about cryotreating like a week ago and got no response <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=';)'> oh well, i know of a company now <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt=':D'>

(Edited by whateverjames at 5:30 pm on Nov. 17, 2001)

[ca18guy]

Whateverjame's did you do a search? This topic is over 4 month's old, you could have found this and saved your self time <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>

[Drift Style S14]

umm at the meet there was a guy from L.A. who just moved to bay area. Well he was running a KA turbo with 350 to the wheels on stock internals. The KA is a iron block, its stronger then the SR's

[transient]

this post has actually helped me out a bit (even though it's 4 months old) I've been looking for aftermarket internals for a while now.