GT2871 USERS. SR motor

[codyace]

Originally Posted by Luvs2slide

Is there big differences/gains in using the 52 trim vs the 56 trim compressor housings?

While not exact, this is a compressor map I plotted a few years back



As you can see, the 56 obviously supports the airflow to make good power, while not going beyond efficiency islands. Both spool up similar, so it make sense to run the larger trim wheel, as it dfoes give some top end room

Originally Posted by BlackZenkiS14

I'd like Cody to clarify this comment for me. Is there any truth to it?

For the 100th time, run a JWT or Enthalpy tune. Most of the idiots suggesting standalones don't even have one in their own car, or their car makes 330 whp from a 'custom tune'. There are very few on here that have any decent results with a standalone, and most of them are owners who are able to tune it themselves.

Originally Posted by tabasco122

Question, whats the max amount of boost this turbo can handle? i see most people run between 20-22 psi, is that because its the max efficiency of the turbo, or is it limited elsewhere. IE if i ran e85+meth could i safely run higher boost?

im just looking at options and wondering if its worth moving to top feed msd injectors instead of trying to find some sard or nismo 750's

If looking at the above compressor map (which isn't exact, but prettty 'close') you'll see that there really isn't much more room uptop to make much more HP in regard to airflow/boost...I'd say 22-24 max before the increased boost just become shot air and counter productive.

The nice thing with E-85 is that you can run more timing, which can increase HP. Not so much running more boost, but even a few degrees can make for nice hp gains.

Top feed and fuel rail would be better imo, simply on cost alone. Sidefeeds are super expensive at that rate as well.

Originally Posted by silversr

I take back what I said about my enthalpy ecu. I checked the mafs plug and the wires were corroded . I ordered a new plug and everything is fine now. I repeat nothing was wrong with the tune and Im an idiot.

I'm glad you at least came back on and admitted that. 95% of the time, this is what is always wrong with rom tune cars, and most people initially react to it, without really diving into the issue. I'm glad you went to check out the problems and resolved it.

Originally Posted by Patrick Bowering

and as for setups the things i regret in mine are the freddy intake it just doesnt help response. and staying with nismo side feeds no more side feeds for me. bosch ev14s cheap and awesome.and no 3 inch intercooler piping.

In regard to 'response' there really isn't anything worthwhile on staying with the stock manifold. Sure you may see 100-300 rpm quicker response and it may make more torque 3000-4000 rpm, but in the grand scheme, who cares about that part of the powerband when the turbo isnt' fully spooled until 4000 rpm? I know I know it sounds funny, but I'd GLADLY give up that 'low end' (unusable really) for increased power and torque throughout the 4000-8000. There is just a point where you gotta go for what gives better average HP over the power band, rather than better down low (especially when the stock manifold kills top end on bigger boost 2871r setups.

In regard to Freddy vs Greddy in HP and response? Hardly any. I've replicated mysetup with a Freddy manifold and it made similar peak (almost identical curve) and almost similar torque.

[BlackZenkiS14]

Ok. JWT it is. For sure.

The problem now lies in that I found out from the Machine shop that my S14 SR that I had sent down there to get rebuilt is essentially not rebuildable, I detonated it all to pieces, gonna need sleeves, pistons, lots of headwork, etc... which means that Im not going to fix it. Im just going to buy a new SR.

So here is my question: Should I go back to an S14 SR? Or just get a Blacktop S13 SR? My plan is still 740cc injectors, Z32 MAF, and 2871 eventually (S14 T28 for now).

Can I use my S14 SR intake manifold on the S13 motor? How about Valve cover?

Whats the best bang for the buck intake for the S13 so I dont have to redo my IC pipes...

[D.Bo]

What turbo manifolds everybody using? im runnin 18 psi and was thinking about upgrading the turbo manifold..been doin some research and im drawn between a tomei manifold or extrude hone stock manifold,

[codyace]

Originally Posted by D.Bo

What turbo manifolds everybody using? im runnin 18 psi and was thinking about upgrading the turbo manifold..been doin some research and im drawn between a tomei manifold or extrude hone stock manifold,

I use an Extrude Honed OEM manifold, with a provision for external wastegate.

Even without the wastegate flange welded on, you can't beat hte stock manifold in regard to reliability, and results. The heat retainining ability lights the little turbo super fast as well. Tubular manifolds are just plain unreliable if you ask me...way to many crack, from cheap to good ones.

For the cost of Extrude, I'd go that route, as it's cheaper than a Tomei. For another 100 bucks you can have the external gate modded too like I did.

With gate:


Extrude GOodness:

[EsChassisLove]

Holy shit that's beautiful.

How long did they have the mani? Definetly doing that with mine.

Edit...Nd where do I go to do it lol

[SlideOrDie831]

cast is the way to go if you don't want any cracking problems. even the high end brands crack. friend had to get his Jic manifold welded three times before trashing it.

[Patrick Bowering]

In regard to 'response' there really isn't anything worthwhile on staying with the stock manifold. Sure you may see 100-300 rpm quicker response and it may make more torque 3000-4000 rpm, but in the grand scheme, who cares about that part of the powerband when the turbo isnt' fully spooled until 4000 rpm? I know I know it sounds funny, but I'd GLADLY give up that 'low end' (unusable really) for increased power and torque throughout the 4000-8000. There is just a point where you gotta go for what gives better average HP over the power band, rather than better down low (especially when the stock manifold kills top end on bigger boost 2871r setups.

In regard to Freddy vs Greddy in HP and response? Hardly any. I've replicated mysetup with a Freddy manifold and it made similar peak (almost identical curve) and almost similar torque.

I reach full spool at 16 psi around 3500. and I was unaware how bad the stock one choked up up top. Right now i just want to get throttle response a bit better build my bottom end and run 19-22 psi and see what it makes I have pretty low torque numbers so im curious how to help those out too. will a lighter flywheel setup have any large effects?

[codyace]

Originally Posted by BlackZenkiS14

So here is my question: Should I go back to an S14 SR? Or just get a Blacktop S13 SR? My plan is still 740cc injectors, Z32 MAF, and 2871 eventually (S14 T28 for now).

If you go with a regular enging, you're not going to retain VTC, and your pipes are going to be different on all aspects...you can't use the S14 manifold on the S13either IIRC, but I could be wrong (I've never done it)

IMO you're best off buying a redtop, rebuilding it, and then putting it in. Once you rebuild it, it will be good as gold. With the condition of things anymore, it's hard to pass up a fresh block that you can put together.

[Creeper]

Originally Posted by TFD

@Creeper: I run those cams on my 2871 .86 turbo.

Benefit is that the air the turbo is pumpin at high boost (1.4 bar) is actually getting into the engine instead of being restricted by the oem cams. I like them and stockish idle.

Thanks for your input TFD, I havent been on since i recently came from vacation.

[codyace]

Originally Posted by EsChassisLove

Holy shit that's beautiful.

How long did they have the mani? Definetly doing that with mine.

Edit...Nd where do I go to do it lol

High Performance, High Output Racing - GetHoned (Extrude Hone)

They take roughly a week to 10 days turnaround for it...it's easier to just buy another stock manifold and send it out, limits the downtime of your car.

In regard to the external gate, that takes about a week from JPC depending on how busy he is with other stuff. If you want that done, shoot me a PM and I can get you his contact info. I typically have the manifolds shipped to me, and then he picks them up as he comes/goes from work at my house.

Originally Posted by Patrick Bowering

I reach full spool at 16 psi around 3500. and I was unaware how bad the stock one choked up up top. Right now i just want to get throttle response a bit better build my bottom end and run 19-22 psi and see what it makes I have pretty low torque numbers so im curious how to help those out too. will a lighter flywheel setup have any large effects?

The thing is, the stock intake manifold's 'bottom end' really isn't going to gain you usable/needed power...and it also choked the top end. A greddy manifold reacts only slightly slower, but the usable power band (4000 to 8000 rpm) has much more HP and torque, and there is no top end power fall off.

Torque wise you should see 315-330 @ 20 psi with 260*/264* decent cams (JWT or Tomei or HKS, not BC)

A lighter flywheel will help too. I actually like them on little turbo cars as the little turbo doesn't need a ton of load to spool, so the light flywheel helps with the revs.

[Patrick Bowering]

ya I have jwt 260s and I made about 290 on 16psi. i just want a bit more torque and for it to rev a bit faster. Throttle response is terrible too but i need to run a high mount ic with 2.5inch pipes instead of this giant greddy thing with 2.75 pipes

[Luvs2slide]

AUTOMOTIVE EXHAUST MANIFOLDS 4 Cylinder Exhaust-Iron
Level I ?
- $495

Is this the one for the extrude hone? ^^

[codyace]

Originally Posted by Patrick Bowering

ya I have jwt 260s and I made about 290 on 16psi. i just want a bit more torque and for it to rev a bit faster. Throttle response is terrible too but i need to run a high mount ic with 2.5inch pipes instead of this giant greddy thing with 2.75 pipes

290 @ 16psi? That's way low...is anything else different? (Tune/timing/etc etc) At 16 psi that should be making near 330-350 whp...my personal car made 290 at 10 psi...yoza.

The thing is, the greddy core you now is more than likely more efficient than most other intercoolers, so total response is going to be moot.

The downfall of turbo cars is going to be grunt down low. Not that I condone driving around it, but it's not like driving a big v8 or a little turbo car, you're going to need to be above the threshold or understand it's a little sluggy out of boost.

Originally Posted by Luvs2slide

AUTOMOTIVE EXHAUST MANIFOLDS 4 Cylinder Exhaust-Iron
Level I ?
- $495

Is this the one for the extrude hone? ^^

Yup, that's what I used. Shame pricing has went up but what hasn't anymore...used to be 400. Still cheaper than a Expreme Crack a fold though!

[EsChassisLove]

290 is hella low. That's low even for a Mustang or dynopak.

Did they forget to advance the timing lol

[EsChassisLove]

I'm really worried about my Hypersingle not being able to handle the tune at 18psi....:/

[Patrick Bowering]

haha it made 350 whp and 290 ftlbs sorry should have specified. on a dyno dynamics. my greddy core is thrashed its had 3 or 4 years now of the year round driving in the interior of british columbia. and it has plenty of power down low I am happy with that, its just throttle response. it needs a bit more driveability tuning to though.

[travypoo]

i kept the stock mani as well. ceramic coated 35 mm turbosmart

[Kingtal0n]

Originally Posted by travypoo

i kept the stock mani as well. ceramic coated 35 mm turbosmart

lovely! I once considered the extrude hone process (at $500~) but at the time Full-Race was selling the bottom mount T-25 manifolds for $800, so I could not pass it up
I utilized the 2871 .86 of course ^ ^

[badbob2121]

Codyace that manifold looks great, i actually just picked up another oem manifold that should be off to get extrude honed in the next month or so..

im also gonna pick up either JWT S3 cams or Tomei Poncams and a JWT tune and see where that gets me

[AZ_BOY]

I have not seen SR with GT2871R making more then 350 HPW. Thats why I'm going with the GT2876R .86 so i can get more then 350 HPW for sure

[Patrick Bowering]

Mine has a .64 and make 350 at 16 psi with plenty of boost to play with and believe cody has broken 400 has he not?

[EsChassisLove]

Originally Posted by AZ_BOY

I have not seen SR with GT2871R making more then 350 HPW. Thats why I'm going with the GT2876R .86 so i can get more then 350 HPW for sure

Are you high? I've seen plenty of Sr20s making sub 400-400+rw on a 2871. I spent a day driving a 392whp Sr s14 through Seattle

You've been seeing some shitty SRs if they cant break 350rw

[codyace]

Originally Posted by AZ_BOY

I have not seen SR with GT2871R making more then 350 HPW. Thats why I'm going with the GT2876R .86 so i can get more then 350 HPW for sure

.64 has been proven time and time again making 350-400+

My personal car, and cloned setups/copy setups all have made 390-410 whp.

[mattsil80wis]

Originally Posted by AZ_BOY

I have not seen SR with GT2871R making more then 350 HPW. Thats why I'm going with the GT2876R .86 so i can get more then 350 HPW for sure

a cody ace built car

‪4-17-10 matt 240sx sr20 gt2871rs powered dyno‬‏ - YouTube

on a base tune...retune is being sent to me this week

[EsChassisLove]

Owhat dyno was that on?

And more info

[codyace]

Originally Posted by EsChassisLove

Owhat dyno was that on?

And more info

A small dyno jet/non load bearing...it's not very turbo car friendly at all...it doesn't provide realworld load so all turbo cars seem to spool later than they do on street, and don't make the torque they would either...oh well! Can't bitch too much as the dyno is always available to me/us.


My dyno 20psi


Here is a 28RS car with S3 cams, JWT ECU, same dyno (don't mind the top end fall off, stock FWD manifolds suck. 18psi




Here is Matt (sil80wis) car, dyno comparison. 20psi and 10psi

[codyace]

run files are available by email as well

[EsChassisLove]

Have to admit that torque curve is absolutely beautiful. Peaks at 4200 and holds strong till redline. I love it.

Can't wait to post what i make on Saturday. Stock head though.

[codyace]

Originally Posted by EsChassisLove

Have to admit that torque curve is absolutely beautiful. Peaks at 4200 and holds strong till redline. I love it.

Can't wait to post what i make on Saturday. Stock head though.

Stock head here as well, aside from JWT S3 Cams. No headwork no nothing.

[BlackZenkiS14]

So the Extrude Honing process on an OEM manifold...what does that do for power/response? Im a fan of the OEM manifold myself, but would like to make it as efficient and powerful as possible. Considering doing this in the future.