GT2871 USERS. SR motor

[s13envy]

get some better tires man!!!

[s13envy]

what was your trap speed on the 12.4 btw?

[OBEEWON]

Yeah, trap speed says alot.

[((sr)) kelly]

like 112 haha..

i just opted for a t67, so bye bye 2871r

[SuicidnS13]

Wow thats a huge difference in spool characteristics.

[((sr)) kelly]

ehhh not really.. i got the 8c^2 so itll have a similar spool time as the 2871r...

got it, a lovefab mani, all I/C piping, new Sard racing bov, FM, and a dp for 2k... the mani alone was 1800 after he paid for it to be ceramic coated.. itll be on as soon as i get a 44mm WG

[1cleanS13]

I'll post up my dyno sheet after next tuesday when mine gets tuned.

Redtop
GT2871R .64
Tomei 256/256 poncams
740cc Tomei injectors
z32 maf
Walbro 255lph
HKS fmic
Greddy elbow
Blitz downpipe
Megan test pipe
Apexi GT Spec exhaust
Power FC

Hoping for 350whp

[INeedNewTires]

Originally Posted by 1cleanS13

Hoping for 350whp

you'll get it no prob with a good tune.... how much boost you planning on running though?

[slideways2004]

Originally Posted by INeedNewTires

you'll get it no prob with a good tune.... how much boost you planning on running though?

how many horses do you have ??

edit: nvm. read the whole thread

[jspaeth]

Originally Posted by 1cleanS13

I'll post up my dyno sheet after next tuesday when mine gets tuned.

Redtop
GT2871R .64
Tomei 256/256 poncams
740cc Tomei injectors
z32 maf
HKS fmic
Greddy elbow
Blitz downpipe
Megan test pipe
Apexi GT Spec exhaust
Power FC

Hoping for 350whp

Yah with stock exhaust/intake manifolds, you should be able to reach 350ish or so.

[idahotuner]

drove my 240 for the first time since the tear down for the build last august.
it sucked cause it was only on a dirt road but my gt287r .64 was spooling so fast. i had to be careful cause the road was so rough and if i barely opened the throttle it would want to take off. On pavement it would have beena different story.

[1cleanS13]

Originally Posted by INeedNewTires

you'll get it no prob with a good tune.... how much boost you planning on running though?

Not sure, I'm guessing somewhere in the 16-18psi range?

[surge s14]

im in the porcess of building my my fisrt sr

so far
New 2871R .63
megen manifold (came w/ the motor)
godspeed fmic (also^)
a leaky ass bov lol (will be replaced)
New CP Pistons
New Eagle Rods
New Cometic gasket
New Acl Bearings Set
New Supertech valves,retainers,springs
and a full gaskets set

i want to make 300 or a bit over if i can.
im planing on up grading the fule system but i dont know what route to go.. and how to manage it but before i want to break it in am i safe with my 370cc on my 2871r?

[Z33dori]

no i would def order a set of 740cc or atleast 550cc....better of getting the 740 tho.

[idahotuner]

^ i agree you risk the cahnce of running really lean and killing your motor

with the stock injectors and bigger turbo.

[1cleanS13]

^^^

I agree with both of these guys. I have babied my car the last 5 months since adding the gt2871r because I was running stock injectors, maf and ecu the whole time and didn't want to take any chances of leaning out and popping my motor. I haven't given my car more than half throttle in 5 months, after tueday when I get my tune I can finally beat on it. Needless to say I can't fucking wait! lol.

[surge s14]

thanks guys im now looking in to Nismo 740cc and sending out my ecu to enthalpy anything else you all can recommend?

+1 for yall

[1cleanS13]

I expected more from my set up, but the guy that tuned it said he wanted to do a "conservative" tune on 91 octane pump gas. I was hoping to run 16-20 psi but the tuner said no way unless we did a race gas tune.

So at 1 bar on a dynapack dyno:
315whp
289wtq

Mods:
Redtop
GT2871R .64
Tomei 256/256 poncams
Walbro 255lph
740cc Tomei's
Z32 maf
HKS fmic
Greddy elbow
Test pipe
Apexi GT Spec exhaust
Blitz downpipe
stock intake and exhaust manifolds
Power FC
Greddy profec B spec II

The thin lines is my baseline when I had my stock t25 at 14psi.

What do you guys think? He tuned my AFR to 11.5 at WOT, I'm kinda new to this and this is my first time getting it tuned...Would it make more power at around 12.0 AFR?

[SoguRacing]

Hey i've got pretty much the same setup as you.^
Hope fully i'm going to get my car tuned within the next few weeks.
SR REDTOP
gt2871 .64
hks adjustable actuator
deatsch 740cc
megan elbow
ssac test pipe
Apexi N1 3in exh with N1 muffler
hks step 1 256/256 10.5mm lift
Xs-Engineering FMIC
Apexi AVCR
Power FC L-Jet

I'm hoping to run about 17 lbs of boost and hit 350. might need more lift on my cams and a slight bit more duration. anybody want to swap me BC cams? PM me.

[1cleanS13]

I was hoping for around 350 too around 17-18psi but my tuner wanted to be more conservative with our crappy 91 octane.

My powerband is pretty awesome so for now I'm still happy with what mine did at 1 bar.

[SoguRacing]

I'd personally like to see hight torque numbers on mine. your guy was conservative but how conservative is the question.

[rotation3x]

Has anyone had a turbo that constantly gained boost?

On the dyno at 1/4 throttle boost showed 3-4 psi until 3800-4k rpm then it spiked to 18-19 and climbing. It did the same thing with the wastegate flapper held open.

I don't know much about tuning but the tuner said with the flap held open it should not make any boost or much at all.

I drove the car before the tune and it held 14 psi on my brand new stri gauge. I told the tuner that and he said my timing was 25 deg off and that was all it would make. I would think with timing that far off the car would hardly run at all.

My turbo was bought brand new from precision.

[rotation3x]

Is any one running a stock manifold not extruded swained anything just stock.

[xxchurroxx]

Originally Posted by rotation3x

Is any one running a stock manifold not extruded swained anything just stock.

yeah. i'm running both stock intake AND exh mani

Originally Posted by xxchurroxx

377 HP and 320 ft/lbs of torque at 18 psi

s14 SR
V-mounted IC/rad w/ dual FAL fans
larger s13 throttle body
stock intake and exhaust manifolds
stock bottom end w/ no head work done
GT2871r .64
BC 264 in/exh cams
BC spring and titanium retainers
z32 maf
Apex'i PFC L-Jetro
exedy stage 2
fidanza flywheel
Deatschwerks 600c injectors
CS flat DP/elbow
Apex GT Spec with JDM 3" gutted cat

FYI, exedy Stage 2 clutches slip @ 320 ft-lbs of torque...hence the flatter torque curve.

[INeedNewTires]

Originally Posted by xxchurroxx

yeah. i'm running both stock intake AND exh mani

i second that.... but plan to do the extrude and swain sometime soon. Also think i may change to E85 setup and get a complete re-tune.... Should make a bit more power and cheaper at the pump....

[rotation3x]

yeah I pulled my turbo and manifold off. I noticed where the manifold goes to the engine it was black for about a 2 inches then changed to brown and where the turbo bolts to the manifold it was also brown.

Is there any reason for that?

[1cleanS13]

Is it true that dynapacks read about 10% lower than dynojets? I saw a few comparison vids online showing back to back runs on the same car and conditions and the dynapack consistently read 8-10% lower every time no matter what car.

I was kinda wondering why my numbers seemed a little low at 1 bar making only 315whp and 289wtq....

Also, is the general rule of thumb that 1 psi = roughly 20whp? If so, at 18psi I should be around 370 which is what I expected but my tuner would only do a "conservative" tune on 91 octane pump gas. I thought the gt2871r .64 was most efficient between 18-21psi....

[OBEEWON]

More like 10whp per psi.

So at 21 you would be sitting pretty at about 400 in theory.

[1cleanS13]

Originally Posted by OBEEWON

More like 10whp per psi.

So at 21 you would be sitting pretty at about 400 in theory.

Cool, thanks for the info. Do most people run race gas or pump on 18-21psi? Most people do not state that in their posts when I am looking at all these dyno #s. I am in Arizona and it gets to 110 degrees here in the summer and all we have is 91 octane readily available so I dunno if it is that smart to run that high psi anyways in my conditions?

[codyace]

Originally Posted by xxchurroxx

yeah. i'm running both stock intake AND exh mani

Nice numbers mang. Nice to see another smart 240 owner not wasting time with the tubular stuff

Your car would be an EXCELLENT candidate to see the differences in gain/loss with a Greddy Plenum.

Originally Posted by 1cleanS13

Cool, thanks for the info. Do most people run race gas or pump on 18-21psi? Most people do not state that in their posts when I am looking at all these dyno #s. I am in Arizona and it gets to 110 degrees here in the summer and all we have is 91 octane readily available so I dunno if it is that smart to run that high psi anyways in my conditions?

I run pump 93 octane @ 20 psi (tuned for 91 tho)