2.65 liter KA vs 2.35 liter SR

[GorillaClub]

well the title kinda explains it, im in the line to start and engine build and I havebeen doing a ton of research, now just want some opinions with pros and cons of each.

Money isnt an object, and both would be using a stroker kit from BC. whats your take on each?

Looking for roughly 525-550 whp, also using for road racing mainly with some drag in there for fun.... Opinions welcome!!!!

[Reno]

if money isnt an object then get a 1jz

[TheOne]

bc stroker kit for ka if money is no object.

stroked ls1 if you relly want fun:).

but still stroker ka just so ya can be 1 of the few with.

[GorillaClub]

i dont feel like swaping engines that dont belong, road race need both light weight and good weight distribution so i want to stay with ka or sr.... so opinions on both

[gt'd ka]

2.65 liter KA has to be sick plus you would make soooo much more torque

[C-Kwik]

Honestly, for the money you would spend on the small increase in displacement, you'ld be better off investing it into the rest of the components that will get you to the HP levels you want. You'll probably spend less money just making sure your KA build-up is of great quality and get results that are just as good. Consider the costs of increasing the displacement by .25L vs the additional power, if any you'ld get from such an increase. I don't see the value in it, unless you were reaching for some number where you have to increase the displacement because you've hit the limit of power you can obtain otherwise...

[GorillaClub]

its not a limit of power im trying to reach, its the spool time im tryig ton increase..... and with money no object, money spent on stroking it or boring it will not come out of money i would have spent on quality parts in the head and such..... i just want to know if the kit is regarded as good.... and whichof the two motors would be the way to go!

[Florida240sx]

Would spend more money on head flow intake mani etc. Alcohol injection. Get a crate motor from AMS. they do have the highest hp KA and are our sponsor. Were you at in FL?

[PapaSmurf2k3]

That or take the money and invest in a huge *** turbo and nitrous to help said turbo spool. But whatever floats your boat man.

[Brandon93240]

Buy a ams built motor, their manifolds, fuel system, get a gt40r, a 125 shot and use it with a 2 stage controller and a ecu with launch control.

[Brandon93240]

Also out of the 2 the ka would be better. The money you'd waste on the stroker you could have ams do some nasty head work for you and for the price would be more benificial for the power you're looking for. Plus ams has a fully counterweighted crank coming to the market. If your thinking about a stroker kit why do you only want 550 or so whp?

[GorillaClub]

wow every needs to get their minds off big power, nitrous, etc. Like i said I want to raod race it hence getting the quickest spool and flattest powerband and stroking it helps a ton with both of those....

I am leaning towards a gt3076 twin scroll from full race and a stroked KA or a AMS built block.... what are your opinions on that?

[Brandon93240]

do you really want 550 whp for a rr? 380-420 is more relative for the type of turbo needed for a quick in the corners car for rr. To each his own but I'd focus more on setting the car up than worry about that much power.

[GorillaClub]

cool, these are the answers im looking for.... for RR 420 might be a little more realistic.... so i could shoot for a smaller turbo to spool a bit faster..

[Brandon93240]

Yes you could, it would give you a more usable powerband for the twisties. True you may get passed by someone on a straight but if you can drive and your car is dialed in you'll pass them in the turns every time. My s14 has about 425-430 to the ground and I was beatin up on a supra with around 650 because he would kick the arce out to much in the real tight turns and in the short straights I was still ahead because I had a more usable powerband. What kind of tracks exactly are you going to be driving on and what rules and reg's are involved?

[S13FX]

350-400rwhp 240 with proper suspension mods,

and you will be wooping *** out there bro.

You need quick spool you say, you might want to look into ball bearing turbos you said money is of no concern then there you go.

Here is how I would do it. Build the Block properly, get some head work done, good manifold, good ball bearing turbo, perfectly tuned suspension.

Goals between 350-400rwhp.

And you will not only have a nice twistie monster but an awesome spooling 2400 pound 240sx.

[Brandon93240]

True, like I said the only competition I have is homeboy in the supra and a sick msr sponsored vette. Both those cars have a minimum of 150 hp more than me. Power to weight ratio and a good crisp suspension setup on hoosiers do me wonders.

[tomkun-s13]

Well first off hope you go the KA route and go big, lol. As should be common knowledge you could build a regular 2.4l with rods, piston and a 3 angle valve job with a balanced bottom end and decked and bored block for about $1800 because that's what I paid for mine. This is a lot less then AMS! Plus "NO" shipping fees to Florida, and that saves money to buy more toys for the car.

As for your turbo, try a Holset VGT which is a variable geometry turbo. This gives you the best of both worlds for bottom end and top end. Garret also sales them if you want to check them out as well.

[PapaSmurf2k3]

Do you perchance have a link to said variable geometry turbos? I have always wanted to look into them. Also, does anyone know where I can find a compressor map for one?

[S13FX]

There actually is a pretty decent discussion on here about these. Il dig it up in a second.

However I think the conclusion we reached is those turbos are great on Disel engine which don't produce high EGT numbers, and not so great on gas powered cars which do.

How ever I think we also did mention something about there being one that works well on a gas powered car but costs and arm and a leg.

[S13FX]

Hey did a quick search on here about VGT turbos. Looks like they get covered a lot in other sections. Here are three links I came across.

zerothread?id=105584http://forums.nicoc ... ?id=207631

Anyways this is a lil off topic but hey seems like a pretty cool idea for your needs ...

[PapaSmurf2k3]

Thanks Mike! If EGT is a problem, maybe a little methanol injection or E85 is in order?

[98koukile]

LS is lighter, smoother powerband, and zero spool up timeI've seen a few race teams use them, if you really needed any more power its easy to pull out of those motors.I know you have your heart set on KA or SR but that'll net you the biggest performance gains in road racing

[moto600]

maybe you might like an rb skyline engine. I hear the internals are miggghty fine but the KA gives you the most bang for the buck without the hastle of the SR

[Brandon93240]

When my ka goes in my road car a griggs ls1 will be going in place of the ka.

[GEO]

Umm the KA is pretty muched stroked to begin with.

[EstoMax]

to get that KA to 2.65 liters i bleieve u have to bore it out to 0.080 which will not take ANY boost because the cylinder walls will simply split. make sure u do some more research before u decide u will want to stroke it out.

from a post on katorgQuote »stock ka24de 2387 - 2389 cc's - displacement

bored 40 over, 90mm bore ka 2442-2443 cc's displacement

bored 40 over and bc stroker kit 2595.6 cc's displacement

bored 60 over 2470.2 cc's displacement

bored 60 over and bc stroker kit 2624.5cc's

bored 80 over 2497.5 cc's

bored 80 over and bc stroker kit. 2653.6 cc's [/quote]now honestly noone has gone over .040 with a boosted KA.. the cylinder walls will simply be too thin.

Marko

[WDRacing]

Just as an example, Fiznat made 420WHP on stock internals and the T3/TO4E with the AEM EMS.

So 420 can be made all day long with 20 lbs of boost some forged internals.

Also, since you want to road race, HP level and power adders might make you go up a class or two as well. So the LSx swap isn't a bad thing. It actually weighs less then the KA and can make 550-600whp naturally aspirated.

WD

[PapaSmurf2k3]

Fiznat actually had forged pistons... and then threw a couple rods (but shhh! he's still bitter). But yeah, forged pistons and rods can make it happen.

Also Brian, you have been nominated to throw a football at Greg's Junk. Ask him about it.

[GlacierFreeze]

I am leaning towards a gt3076 twin scroll from full race and a stroked KA or a AMS built block.... what are your opinions on that?

Check this out. Auto-X SM car with gt3071r twinscroll. The chart shows about 360ft/lbs but he also said later he hit 400ft/lbs at ~3600rpms. He does have a water/air intercooler with short piping which helps his spool time but if you wanted to run air/air then you could probably go topmount setup and keep piping to a minimum.

shorter threadhttp://www.ka-t.org/forums/vie...art=0

longer threadIt's on freshalloy but this site must not like links to that site. blah

The 3076r and bigger cams would have a lot more topend for road race. He likes low and midrange since he's auto-x. PS: Stock stroke.