Brian W.

yeah, well even still i wouldnt say 420whp is a low # for my setup at all. that was with a 15% correction. a 13% correction would be 420whp.


and we probably are the closest Dyno Dynamics to you. feel free to shoot me an email or give us a call. our prices on dyno time are reasonable for sure.

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OBEEWON

420 sounds more right. Ive seen 458 on the .86 which is what you get close to if you do the multiplication. Im not sure what dyno that was on though.

Anyone else have problems with Crower 272's post up please because every tuner I have been to has been stumped.

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steve shadows

Im pretty sure I saw the same graph on Freshalloy and it was a DynoJet

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OBEEWON

I've seen that also, But the setup I was reffering to was a guy up in Jersey. I saw his car in person

A question for those with or familiar with 272's. What type of vac numbers at idle. I'm at 7-9 no more than 10 and Im sure thats wrong hinting to an issue with these cams.

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steve shadows

-10 is about right at idle.

If your using an auto-meter gauge who knows, those things are soo far off most of the time.

My gauge will read like 24 psi sometimes, and my haltech data log and the dyno will both ready a spike no higher than 19 psi :ghey:

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DanDriftS13

-10 sounds about right for 272's because I have crower 264's in mine and I'm seeing about 16-17 vacuum at idle.

smelly240

i get what dandrifts13 gets - i think anyways - my shits in bar.

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DanDriftS13

a tad more than 1bar?

smelly240

somethin like that its too cold to start that stupid thing up - plus its all unpainted so i dont even wanna look at it.

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HREs on a S13 - check, 6262 - check, Girlfriend.... - nope

OBEEWON

Lol, your non paint looks better than my 'paint.'

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OBEEWON

I never got the details of your setup. What cams are you using?

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s13envy

the info i gave about the cams came from steward engines. The same guys that build heads and blocks for enjuku racing.

OBEEWON

Can you give me specifics? I contacted BC and they arent being very receptive. Im going to a machine shop to get them looked over, but a little more info would be helpful.

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rotation3x

Im getting my motor back in my car this weekend or next weekend. I got the gt2871r .64 and I was kinda wondering what to expect from it with stock cams and manifolds. Eventually I plan to get the BC 264's since it will be street driven.

Anyone know what the stock setting is on the 2871's wastegate actuator and how much boost it can handle?

serturbo

Isn't it set to 1 bar? I'll know for sure when I get my engine installed. I've seen people mention that the max psi is about 18-21.

codyace

Never had an issue with any of my Autometers or VDO's when compared with logging values with the Innovate LM1 and the map sensor....I should really get that setup back together and use it on a dyno run mmmm MAF car with logged boost hotness. What Autometer version/type where you using Stevie?


It'll run ok, make the tradiational 310-330 whp....quick spooler, but def a turbo that LOVES low 26x duration cams.

Reliably? Maybe about one bar. I've been able to boost 19-20 with just the wastegate...that's creeping and holding to redline.

I know FWD guys using the cams have had to spend some time dialing them in with cam gears to get them to work right. Not sure why'd you want 272's with a t2 based turbo though....

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Steeles

I've had problems with my .86 spiking. trying to get it to hold 20psi it wants to shoot to 25 and bounce. (boost cut on the standalone is set to 22 now and I haven't messed with it in a few days due to other issues with the car) But I know ((SR)) Kelly was having a similar issue with that boost level. I'm starting to wonder if the internal wastegate isn't up to holding that.

bottom mount T25 flanged internal wastegate. HKS adjustable wastegate actuator set to 10psi.

I hit 345hp (stock cams, on a dynojet) with it spiking like that.

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DrifterProdigy85

I run Tomei 270 Solid Cams on my 2871R .86 setup. There really not that bad. You can feel the difference when the turbo hits full boost to when you hit peak tq though. Hits around 20psi on the street below 4500rpm and tq feels the hardest around 5500rpm. Power feels like it comes on smoother than it used to with the 264 cams. Less wheel spin going from a 2nd gear roll but if you clutch kick, the tires spin like crazy. I should dyno this setup before i stick my GT3567R setup on. I raced a new M5 on the highway last weekend and I pulled around 6 car lengths from 60mph to 120mph. Guy was pretty surprised. My setup is pretty close to Brian W. except i have a P&P Head, Valve Job, and Ichiba Vers. II Exh. Mani.

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rotation3x

At what boost level does the stock 370cc injectors and maf max out with the 2871r .64?

OBEEWON

I wouldn't run more than 12-14 psi on stock injectors. But thats just me.

Dumping 740's and going with Sard 850's, so you can buy mine if you want.

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Steeles

theresa a thread on fresh alloy in the basic section on running the GT2871r one stock stuff. general consensus. don't bother. get your fuel and ignition fuel control set up first. unless your turbo is absolutely dead.

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steve shadows

Im not a really big fan of the .86 on stock displacement for this reason.

Peak torque for a lot of t3/t4 cars Ive tuned comes on before this even with high duration cams (like 272).

But personally I feel the benefit of having a bottom mount with a T28 trim family wheel is to have it very fast spooling and torque building-style of power band.

I would wager that a properly tuned GT3071R with .63 housing will poop all over the .86 housing 2871R.

note exibit A



car made about 375 whp on a dynojet , but just note the point where the curve builds to peak torque.

and compare it to most .86 graphs, this is also a GT3076R which is even larger and mis-matched wheels on the CHRA

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INeedNewTires

here's my setup

S14 SR
Crower rods
Weisco forged pistons bored .020 over.
HKS cams 264's
rebuilt head
GT2871R .64
stock intake and exhaust manifold
Hybrid IC
Apexi intake
Z32 MAF
740cc injectors
walbro 255 fuel pump
Apexi 3 in exhaust
Greddy elbow and down pipe
megan test pipe
Tuned with Apexi power FC

So at 1.3 BAR she made 363 whp and 353 tq w/ 93 octane

What do you guys think? I was hoping for at least 380, maby closer to 400.



Also wierd dip around 5k huh? any idea's on this?

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steve shadows

what is the boost data logging in that dip?

What is boost doing there? check if boost is dipping.

If it's not it's a bad tune. Seems kind of choppy anyways

also is that an .86 Housing? seems very fast spooling

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INeedNewTires

i edited, its .64.... dont know what the boost is doin i'll have to check with the guy who tuned it... Also just realized it was tuned with a gutted cat not the test pipe i installed afterwards... if that makes a difference (minimal i'm sure)

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steve shadows

That's not your problem. (gutted cat)

The problem is bad tuning (timing map) Like he did not adjust where VTC came on (if you still have it operating on the motor)

or boost is bleeding off and then coming back, Im havinga similar problem right now with an external wg, the solenoid didnt have enough start duty so it would overcorrected when peak boost came on in mid-range

You tuner should have a data file of the run where youguys logged boost over RPM.

should...at least

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INeedNewTires

yea i just meant a difference in some of the power... i know that has nothing to do with the dip.

Every now and then it'll over boost and it cuts itself out, esp when its cold outside. I have a dual stage MBC that has a lil solenoid switch, i've got it set for 1 bar and 1.3 bars hi/lo

I'll check with the tuner if he has the boost data but doubt it, its been almost a year and well, i just dont know.... Sure wish there was a good nissan tuner in dallas tx... anyone know of a good one?

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steve shadows

Not off the top of my head. Texas has a lot of good tuners, so does Florida and Virginian/ PA

I would junk the manual boost controller, they are trash for effectivey controlling smaller bottom mount turbos with internal wastgates.

I would get the PFC boost solenoid and use that in conjunction with the PFC unit. In my experience this seems to be the best closed loop bc to manage those smaller turbos.

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Steeles

Steve, have you seen any issues with the stock internal wastegates not holding 20psi? mine seems to flutter between 20-25 when I try and set the HKS EVC. 15 holds fine. actuator is set at 10. alot of this has me wanting to get the .64 housing and swap out. (i was supposed to be getting a .64 when i bought mine. got an .86 instead)

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steve shadows

EVC?

I think the greddy Profec B and the PFC are the best in my experience in controlling the boost spike or drop off.

other than that you can try porting the wg door hole a little bit and like you said pre-loading your adjustable wg.

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