GT2871 USERS. SR motor

[sr20det_510]

Not yet but when I get it .5 bored over I'm prob gonna deck the block so everything is nice and tidy most likely gonna deck the head also what u guys think thanks for the input

[KoukiMonsta]

Originally Posted by sr20det_510

Not yet but when I get it .5 bored over I'm prob gonna deck the block so everything is nice and tidy most likely gonna deck the head also what u guys think thanks for the input

get measurements from the machine shop how much material is removed, search online for a static compression ration calculator, plug in values and mess with HG value till you get desired compression ratio

[sr20det_510]

Well the higher the comp the lower boost right? The more material removed the higher the comp so that's why go with a 1.5 gasket?

[zombiewolf513]

I said the 1.5 because if you get a bunch of material removed you're compression ratio wouldn't be absurdly high, and if they didn't remove a lot you'd be sitting closer to a stock compression ratio and be safer from knock if you run into shitty gas.

Oh, and get some nice springs for those cams, not cheap garbage.

[zombiewolf513]

Firstly, sorry for the double post

Originally Posted by sr20det_510

But what do you guys think about the 9:1 compression pistons? Run that 1.5 apexi gasket? What do u guys think about my setup? Ecu? Bore? Thanks for your input zombie

CodyAce swears by JWT, and they're highly rated. If you want a super nice standalone you could go with a Haltech Platinum Sport, a lot of people tune them. Or AEM, or PowerFC if you've got someone to tune it.

The post up there ^^^ answers the pistons thing in association with the head gasket. Keep in mind that what I said is just my understanding and opinion and what I did. You can see all the deets here: http://zilvia.net/f/builds-builds-on...ida-build.html

Originally Posted by KoukiMonsta

has the block/head been decked?

that effects compression ratio, i have been researching it myself lately as im running the same setup...

apexi 1.5 seems to be my plan, tho i think this head has been surfaced twice..not entirely sure.

my buddy runs a 1.8 Tomei HG with only Tomei Poncams and Tomei Reytec without anything decked and the thing is super quick on 1 bar. Not sure what it's output is, but it can hang. I'd say go with the 1.5 to be safe.

[EsChassisLove]

Go AEM V2 or AEM Infinity series.

Seriously fuck all other stand alones.

[EsChassisLove]

And JWT S3s are really really mild cams. I regret getting them. I should of got S4 or S4HL.

LIFT is where the powers at.

[sr20det_510]

Well I'm about to get bc264's what u guys think?

[zombiewolf513]

screw BC. JWT cams hands down best choice.

[sr20det_510]

Why so negative towards bc

[zombiewolf513]

I've seen nothing but bad come from their products being used on my friends cars.

[BlackZenkiS14]

Same here, friend installed some BC 264s and the car idled rougher, and sounded better, but said it was almost negligible power gains.

I went with JWT S3s myself. Can't wait to get them installed!

[gotta240]

Originally Posted by EsChassisLove

And JWT S3s are really really mild cams. I regret getting them. I should of got S4 or S4HL.

LIFT is where the powers at.

So sell em to me. Seriously. I'm local and am looking for a decent priced set.

[sr20det_510]

lol ok i guess ill get jwt s3's since i want this to be a daily.... so you guys agree with the .5 bore and 9:1 comp? decked block and head, 1.5 gasket, micro polish crank maybe not on the arp mains but for sure head, greedy pan jw or hks 264 cams, greddy intake gt2871r a power fc or aem stand alone.... maf or map?????

[sr20det_510]

also what kind of injectors and valves? springs? retainers? lifters? stoppers? adjustable cams? tb? can someone list like a complete lil beast reliable setup list please???? thanks guys

[EsChassisLove]

With JWT S3s you can use a completely stock head. No need for fancy stuff.

[sr20det_510]

Ok great saves me some cash and as far as fuel delivery I will be using a walbro 255 koo right?

[EsChassisLove]

Use an AEM 310lph. Costs a few bucks more an much more reliable.

550 or 740cc injectors with a Tomei FPR will be great.

[sr20det_510]

Thank will keep that in mind that setup will kill mpg tho huh

[4-20sx]

I believe Cody gets like 30 miles a gallon on his setup.

[EsChassisLove]

Originally Posted by sr20det_510

Thank will keep that in mind that setup will kill mpg tho huh

Not with a good tune. I average about 28 highway on my engine right now

[BlackZenkiS14]

Originally Posted by sr20det_510

lol ok i guess ill get jwt s3's since i want this to be a daily.... so you guys agree with the .5 bore and 9:1 comp? decked block and head, 1.5 gasket, micro polish crank maybe not on the arp mains but for sure head, greedy pan jw or hks 264 cams, greddy intake gt2871r a power fc or aem stand alone.... maf or map?????

Seems like a shit ton of machine work and excess expenditures that would otherwise be unnecessary for a daily?

Why not just run a stock block and head with cams and bolt ons and a JWT ECU? You'll still make like 350whp easy, and not have all the bullshit that comes along with a race prepped built engine. And you'll have a daily reliable tune that you don't have to mess with all the time, or take somewhere every year or so to get tuned?

[Seraphim38]

not only that, with a 350rwhp the Greddy intake manifold will rob more bottom end than it will give back up top.

Go MAP sensor whether you do AEM or Apexi. Apexi is easier to tune since it is simpler than the AEM EMS, but the EMS has more long range capability and is just slightly more expensive, new.

Either the JWT or Enthalpy solutions for a GT2871R are quite competent. I had an Enthalpy and it was great, when I was at that stage.

[sr20det_510]

Thanks for the input guys really appreciate it, well i already got the pistons i mean i have the engine apart so might as well do it right? like this i know i have a good bottom end, or should i sell the pistons and not bore the block?, as far as porting the head im getting that done for free, so should i not got a greddy intake mani, should i get a freddy or stay with the stock one and just port it?, i have a guy that works for me does good port jobs,

[Seraphim38]

"doing it" while the motor is out can be a slippery slope: there's all kinds of stuff that can be done, the question is what is necessary to achieve your goals and what isn't necessary. The Mazworx workup on the bottom end of my SR was over $5 grand. It wouldn't be necessary for a 350whp goal, and labor/parts can add up quickly if not controlled.

Boring the block and running aftermarket pistons is ok. I wouldn't get too crazy with the bottom end, since that's not where most of the bang for the buck can be had. I suggest building it right for tolerances with good bearings, and spend the money on other stuff. There are plenty of SRs running to 400rwhp with a stock bottom end, a metal head gasket and ARP head studs (among other things not in the bottom end).

Locally my builder has had stock manifolds to 500rwhp on pro-am drift cars, and the purpose of using it was to get more torque in the midrange. Greddy/Freddy manifolds move the powerband up higher because of shorter intake runners and that may or may not be right for you: it may not gain you anything at 350rwhp, and if it does, it may not be in an area up high that you would use commonly in daily driving. If it isn't plainly obvious, spending it on a better turbo, or better intercooler piping, or into stage 1 or 2 professional head porting, or a better tune--these are the things that will pay off big time.

[sr20det_510]

awesome thanks for the heads up, as far as lobor for engine work, i will be doing my self, and my engine builder, i work at a shop were im surrounded by ex nascar engine builders, and ive been turning wrenches for about 5 years. so bottom end wont be that bad, i just want to make sure that .5 bore and the 9:1 comp is fine, i guess ill just port the stock mani, what tb should i use, once again thanks for your input guys and sorry for the million qurestions i just wanna do this right

[801nismo104]

stock tb will be fine for only 350hp

[Seraphim38]

.5 bore is also not a big deal. I have built two motors at +0.5. 9:1 compression is also fine. There are guys that go higher and run less boost for responsiveness and midrange, to reduce turbo lag, but it becomes more sensitive to tuning and detonation. Yes, stock TB is fine at that hp level.

[mewantkouki]

Originally Posted by BlackZenkiS14

Seems like a shit ton of machine work and excess expenditures that would otherwise be unnecessary for a daily?

Why not just run a stock block and head with cams and bolt ons and a JWT ECU? You'll still make like 350whp easy, and not have all the bullshit that comes along with a race prepped built engine. And you'll have a daily reliable tune that you don't have to mess with all the time, or take somewhere every year or so to get tuned?

Best advice ever. I had a s14 sr, swapped the bearings out, apexi 1.1mm hg, gt2871r, supertech single springs, hks step 1 256 / 264 cams, 555cc injectors, enthalpy tune, N/A s14 SR throttle body. Car never missed a beat and was by far the most reliable / fun motor I've ever owned. 355whp 330tq

[sr20det_510]

that sound like what i exactly want, but since i already have the pistons i might as well throw them in, so here it goes in conclusion micropolished crank, if needed main bearings, arp main yah or nah?, .5 bore 9:1 comp, no deck on block 1.5 apexi gasket with arp head studs, no deck on head just port, supertech single springs, either hks, bc, or jw 264 cams, stock lifters, stock ratianers, stock valves gt2871r stock tb, stock intake with port, megan top mount ex mani, 255 pump ok? 310? 800cc injectors, with tomei frp? call it a day? oh yeah and aem ems? you guys approve?