KA-T SOHC Build to 250HP

[eastreetmotorsports]

ok i apologize if i am asking the same ?'s but i looked and looked and could get the answer i was looking for on here, so here goes.

a friend gave me a Single KA in great shape, so i am wanting to build up a turbo set up and i was wondering would i need to have my block port/polish, bigger pistons, and valves/springs to achieve 250HP inorder to avoid blowing it up???? or what would be some minor upgrade recomedations outside of:

fuel inj/fuel pumpmanifoldturbo kitECU

thanks in advance

[sicride]

http://www.jgstools.com/turbo/kamain.html

JGS KA24E Starter Package $1688Downpipe $250440cc injectors $200Walbro 255lph fuel pump $100JWT ECU $500ebay FMIC + custom piping ~$200-300?ebay MBC ~$502.5" or preferably 3" exhaust zerothread/48608 $460

Should pretty simply net 250whp

Should gets:Wideband A/F gaugeBoost GaugeZ32 MAF if you care to go above 250whp

Misc. Odds and endsvacuum linesvacuum t'sexhaust gasketsetc.

[eastreetmotorsports]

thanks! that is not a bad cost at all, i just heard so many horror stories about KA-T's blowing up cause the block and internals couldn't handle the pressure but if these bolt on's and fine tuning can help then that sounds good to me, cause that would have sucked to put down some cash and it craped out of me.

lata!

[WDRacing]

300WHP give or take seems to be a safe range to stay in for quite sometime with no issues. If you avoid detonation, the pistons have sat 400WHP or so with no isses. The #3 rod likes to unass itself though...somtimes with no warning...like mine did...and Fosters and quite a few other guys...lol.

So yeah, 300 is good.

WD

[wild_maxx]

HAHA who would ever wan't to turbo the pos sohc.... j/k

250 hp... thats nothin

[eastreetmotorsports]

LOL!!! i know stupid single cam!!!! well i just wanted to have some powa for the track days so i don't get passed by everyone, but i am doing the passing

[wild_maxx]

d00d... i was kidding.. i have a built SOHC turbo.

Keep it!

VVV-- click link for more specs/pics

[eastreetmotorsports]

oh no prob i knew you were joking!!!

[nelson8708]

single cam FTW!!!

[95S14TNR]

well you dont need to go with bigger pistons and the whole 9. but it would be a good idea. being that the stock compression ratio on the k engine is good for a turbo , but the stock rods r pencil thin so what i would do and what i am doin on my k build is go lowered compression ( to a 9:1 or 8.5:1 just to be safe) forged pistons and rods . and about the bigger pistons , its easier to find pistons for a .020 or .030 over and really hard to find for a stock bore. so for 400 bucks i am goin out to bore mine 30 over. just a thought. let me know if u have ne questions.

[eastreetmotorsports]

what brand pistons and rods are you using???

i was thinking of supertech pistons and rods....

and are there any crank, rocker, upgrades out there??? or do i need to use stock???

i just steamed my block and cleaned all the dead oil off of it to paint it.

[95S14TNR]

Ok well pistons personally have found that not only are the best brands but the only brands i found that make them are CP and WEISCO (supretech ive heard were lower end ) but the catch is that they only sell them with at least a 20 over bore. So if ur gonna keep the stock broe ur gonna ahve to do some research.

As far as the crank , its INDESTRUCTABLE, dont even bother trying to upgrade, when you do the rods and pistons your going to be down there anyways so what i suggest doing is taking the crank to a speed shop to have it journaled and balanced and itll be good forever. Let me know if you have any other questions.

[wild_maxx]

stock rods are not pencil thin... there are some people that have run over 400 HP on stock rods.

Go with either eagle rods or the ams/turbo240 rods and what ever pistons you want. Keep the compression around 9:1 for better low end power.. lower comp. if you plan to push alot of boost.

[martins_240sx]

i also am building a sohc turbo...im going to be using damn near everything on jgstools but i just dont know what pistons,.....i mean compression ratio i want ....stock i believe is 8;6....not sure though... i was thinking eagle rods and cp pistons with a .020 over bore, but once again i dont know what pistons make what ratios......my aim is for 300 to 330hp range...early you guys were talking about the 3rd rod causing problems...what kinda of problems? oh and do any of you have any recomandations on tuning..... chip or safc or?

[95S14TNR]

No , stock is 9.5:1 depending on where ur k motor is from. If its already in a 240 and came like that from the factory ur cr is 9.5:1 , if on the other hand it came out of a truck i believe its higher some where around the 11:1 range.

Pistons are much easier to find with atleast a 20 over bore look into cp and weisco. They are great names and there fairly cheap.

The #3 rod is a defect of some sort, nothing to worry about if ur keeping the car na but if your doing a k-t bolt on you want to watch the hp and psi. The rod is the first one to go before the others.

[S13FX]

Ok I had to chime in on the compression ratios so many people are so mis infromed about this I actually called nissan and found out.

Early motors had 9.1 compression. later single cam motors had 8.6:1 compression, an easy way to tell is if you have a air temp sensor, you have the 8.6 compression. Also both motors have the same bore, stroke. Nissan started using a thicker head gasket to achive lower compression, they also changed the ecu.

Also all 90s have the 8.6:1 compression ratio.

Hopefully this helps out a bit.

[eastreetmotorsports]

thanks for the input, i think the CP pistons look like an option i'm interested in, and i will take the crank and have it balanced that is a great idea!

[S13FX]

Arias is good too, thats what AMS includes in thier rebuild kit .

[hek1620]

if ur goal is 250w, don't even lift the valve cover. just get good parts and good tuning. but do a compression test at least to make sure it IS in good condition.

[95S14TNR]

The early year nissans had a 8.6:1? What about the 95-97 s14s? Im working on a k build now and im debating on weather i should run stock internals or go full out built. I have a 95 k dohc

[Tulsa_S-13]

AMS has some of the best prices and parts for the KA. Their rebuild kit is kickass and for the price can't be beat!

For the goals your wanting a Z31 T3 setup might be your best bet, honestly though I would look into a T3/To4e. One can be had for fairly cheap nowadays, its insane.

Be sure, of course, to check out the JGS starter kit, awesome price, proven power.

Oh, and check out the threads concerning the AMS KA turbo manifold, work of art and the only decent bottom mount manifold (soon to be) out on the market.

[95S14TNR]

T3/T04 set up is most common , you can fins a fill bolt on set up on ebay for like 700.

[eastreetmotorsports]

I looked over the JGS kit and i am very impressed with there set up, i'll look into AMS today, now as far as not touching the stock internals....TO LATE i had to cause the motor had antifreeze and oil mixed so lovely!!! so i might as well put some new parts in there to last me for awhile....and since i am not having the block bored out, i will get some forged piston to replace the stock pistons and upgrade rods, springs while i am at it......then bolt on a turbo to put up some good numbers. and insted of putting up pic after pic during the whole process i'm documenting every thing and then i'll post it all after i am done.....however i have it on my site showing the progress.

[95S14TNR]

Every where i look i cant find any place that make stock bore pisotns. Every where i actually find pistons its at least for a 20 over bore. If any one knows where i can find stock bore pistons for a 9:1 or 8.5:1cr let me know . Thanks

[S13FX]

And what's wrong with .020 over?

[WDRacing]

If you call them, they'll ship you stock bore size...

[eastreetmotorsports]

nothin's wrong with it, i still may choose that option, who knows right now.

[95S14TNR]

Absoultly nothing is wrong with 20 over. Im not sure what i wanna do yet , i figured if its gonna make it easier to find the pistons 20 over then just go head and bore it out, it only gives u more in the end. And i called 240sx motoring and they told me that its extremely hard to find pistons for a stock bore , they told me atleast 20 over and the lowest cr they sell is 8.5:1

[eastreetmotorsports]

guess i'll be getting the 20over then!! if it is that hard to find i don't want to spend mo's trying to find pistons....thank for the update!

[eastreetmotorsports]

yo! guy's thought i would ask some compadres....a friend of mine gave me a use CT26 turbo off of a toyota supra 91 i was wondering if anyone has used this type of turbo on there ka-T build???



Lata!! and Merry Christmas