GT2871 USERS. SR motor

[IKnowAllOfNothing]

Originally Posted by codyace

I don't have any input on BC cams, nor do I know enough results from the forum to give you an opinion them.

With that said however, I will say that JWT puts THE MOST time, effort, and research into Cam design and testing, and offers a product that is superior to all. The downfall of them is their cost, but it's a cost that's well worth it. I hope to someday be able to step up to a C series cam



Certainly! keep my informed!

Great setup,
How do you think switching to (JWT C1 cams, retainers, and strings) would affect your setup, power, midrange, spool, overall fun?

[mcdonne32004]

Originally Posted by OBEEWON

That makes sense. What do you think about the Crower cams. The price is great and I was thinking of going 272 exhaust and 264 intake. The s4 cams are comparable to 264's right? or is it 272's?

Hey we missed you at the 240 meet. We are havning another one in May, maybe this time it wont rain. It would be nice to see your car in person.

just had b/c (264) cams installed on my sr, they're bad ass, my topend is a lot faster then it was and the idle is still rock solid with a little cam loop after it warms up. idle is at 750. i'll be going to rt tuning in the coming weeks to see what #'s it puts down. anyone interested it a dyno day?

[OBEEWON]

Great. Make sure you post when you get everything together. Very interested in seeing your results even if its a butt dyno.

I just noticed you live in lancaster, are you going to Nico fest in Carlise next month?

[Wahl 136]

Originally Posted by OBEEWON

Great. Make sure you post when you get everything together. Very interested in seeing your results even if its a butt dyno.

I just noticed you live in lancaster, are you going to Nico fest in Carlise next month?

Only if it's on ESPN I'm 2000 miles from there!

[DrifterProdigy85]

This is 2871R .86. Runs were at 14psi, 16psi, and 19psi. Running HKS 264 Step 1 Cams and Greddy Intake Manifold. Clutch was slipping pretty bad on the 16psi and 19psi runs. I'll be redynoing Sunday with new Clutch, Flywheel, and Brian Crower 264 Cams. Ill post the new graph when i get it.

[DrifterProdigy85]

Heres my Dyno Run on the 2871R .86 today @ 16-17psi. I wanted to dyno around 19psi but was having some issues trying to do so.

[steve shadows]

Originally Posted by DrifterProdigy85

Heres my Dyno Run on the 2871R .86 today @ 16-17psi. I wanted to dyno around 19psi but was having some issues trying to do so.

let me guess crappy internal gate being a PITA to work with?

[DrifterProdigy85]

I think that too. Im really debating on Swapping to a T3 .63 housing and going Top Mount with 38 or 44mm External Gate. Anyone know of an actuator the same design as the 2871R one to upgrade too?

[codyace]

Originally Posted by steve shadows

let me guess crappy internal gate being a PITA to work with?

I dunno why these guys have such a problem with internal gates and the creep issues....I NEVER had any issue with it (except when it would get like 25 degrees out it may creep a 1 psi) with my car or any of the sentras....

Originally Posted by DrifterProdigy85

I think that too. Im really debating on Swapping to a T3 .63 housing and going Top Mount with 38 or 44mm External Gate. Anyone know of an actuator the same design as the 2871R one to upgrade too?

The HKS one works as a replacement for the Garrett unit...

[DrifterProdigy85]

Ill try to mount the HKS actuator next time i remove the turbo assembly. Earlier in the day i blew a IC pipe off and then fixed it before dynoing so it could have messed with the boost settings a bit on the AVCR. Theres another dyno in a few weeks. Ill do what i can to get 19-20psi to hold and redyno. Id love to see 400whp but i think its pushing the 2871R alot. Id rather have a GT30R to be honest.

[codyace]

Originally Posted by DrifterProdigy85

Ill try to mount the HKS actuator next time i remove the turbo assembly. Earlier in the day i blew a IC pipe off and then fixed it before dynoing so it could have messed with the boost settings a bit on the AVCR. Theres another dyno in a few weeks. Ill do what i can to get 19-20psi to hold and redyno. Id love to see 400whp but i think its pushing the 2871R alot. Id rather have a GT30R to be honest.

I don't think 400 whp is much for the 2871rs....they're still effecient at that 20 psi airflow level, and offer response that you can't find anywhere in larger turbos.


I guess growing up in a v8 house has spoiled me...I could never own a turbo car that doesn't make 300 ft lbs at 3500/4k....

[s13envy]

I recently dyno'd my 2871R and got 378hp and 312trq with a slipping clutch and only 1 bolt holding the turbo on (yes I said one bolt) I had a habit of checking them every so often but I thought I finally go the problem fixed...i guess not. I dyno'd 353hp and 278trq at 15psi. (btw, these were done on a dyno jet) I know I'm making more power than I put down b/c I've been to the track twice before the dyno and I'm running .4-.5 slower in the 1/4. Last year I was able to pull a 11.0 @ 125....best I've got this year as been a 11.4 @ 122. I'm thinking alot of power is lost from the air leaking out between the manifold and the turbo and also some power lost from the clutch not letting it get back to the rear tires....

got a rps 6puck, fidanza flywheel coming, and I will be putting the other 3 bolts back in the turbo and may hit up the dyno again.

[Wahl 136]

Originally Posted by s13envy

I recently dyno'd my 2871R and got 378hp and 312trq with a slipping clutch and only 1 bolt holding the turbo on (yes I said one bolt) I had a habit of checking them every so often but I thought I finally go the problem fixed...i guess not. I dyno'd 353hp and 278trq at 15psi. (btw, these were done on a dyno jet) I know I'm making more power than I put down b/c I've been to the track twice before the dyno and I'm running .4-.5 slower in the 1/4. Last year I was able to pull a 11.0 @ 125....best I've got this year as been a 11.4 @ 122. I'm thinking alot of power is lost from the air leaking out between the manifold and the turbo and also some power lost from the clutch not letting it get back to the rear tires....

got a rps 6puck, fidanza flywheel coming, and I will be putting the other 3 bolts back in the turbo and may hit up the dyno again.

So the nuts on the maifold all fell out leaving only 1 holding it in place??

[s13envy]

haha, yes. I had a problem keeping them on for a while and used to check them quite oftem but i had seemed to have gotten rid of that problem so i quit checking them. I guess I didn't get rid of the problem

[hellion240sx]

s13 envy when are you going to redyno? with all the bolts to see if your numbers change? i'm guessing the low torque is from the slipping clutch?

[s13envy]

i was wondering about the trq being so low as well. I dont know if it was actually slipping on the dyno or not. I would guess so, but *shrugs* I dont know when I'll get back to the dyno. Don't realy have the money to spend right now. I will let you know when I do though.

[DrifterProdigy85]

Id be interested in a dyno day but RT Tuning is a far drive for me.

S13Envy, I think your low torque is just from the 15psi boost. From your 15psi numbers, it doesnt seem like torque was dropping any. Post up the dyno. If the clutch was slipping, then youll have similar torque curves like my Dynapack graph above. It hits peak then slips really bad which shows the torque dropping. With a new clutch, i ended up making 25whp at the same boost because the torque was able to hold solid to redline. We both probably make around the same HP numbers. Ill let you know on track times since ill be going this friday. I wont be in any 11 second range but im hoping for trap speeds in the 120-125mph area. Alots gonna depend on if i get my boost leaks fixed to run 20psi. Otherwise ill be stuck down around 16-17psi.

[s13envy]

i did 312trq at something like 24lbs....did 278trq at my 15lbs pull. here is the dyno sheet. Dont mind the AFRs too much...I ran open downpipe and they couldn't keep the probe in the exhaust. It actualy shot out and hit the wall on one of the runs. I've never seen anything over low 12 AFR's on my wideband...maybe my wideband is getting old...I know I could use some bigger injectors for sure. Btw, the runs were done with unleaded 104 octane.

[hellion240sx]

wow thats nice! please keep us updated on the next dyno sessions. i want the .86 turbo myself. so i want to see what its (proven) capable of.

[DrifterProdigy85]

Definitly doesnt look like your clutch was slipping. Whats your Exhaust and Cam setup?

[codyace]

Originally Posted by DrifterProdigy85

Definitly doesnt look like your clutch was slipping. Whats your Exhaust and Cam setup?

Totally agree. For 24 psi, that is a very weak dyno. Either it's reading low, or there are stock cams in there....

[s13envy]

Originally Posted by DrifterProdigy85

Definitly doesnt look like your clutch was slipping. Whats your Exhaust and Cam setup?

I was running open downpipe there and I'm running the HKS step 2 264's...I think i may have a boost leak....I found a questionable coupler with some decnet size cracks in it.

Does anyone know what the 2871R is good for boost wise?

the only thing i dont get is that I trapped 128 in the 1/4...I've never seen any 240 with 375whp trapping that speed. Maybe since I fixed the turbo bolts and clutch slippage the power is up to where it shoudl be now....but i wont know until I get it back to the dyno.

[GSXRJJordan]

boost is measured at the intake manifold, so fixing a boost leak would just let you reach your target boost sooner, with the turbo spinning at a more efficient speed. 128 traps are fast as shit... I'm only trapping 140 or so on my 10.2 sec bike...

[s13envy]

hmmm, i dunno. i just need to get it back on the dyno and find out for sure

[DrifterProdigy85]

The dyno numbers are reading off. If you check out any other SR dyno. 300tq @ 7krpm is 400whp. 128mph trap is almost 450whp in a full weight S13 i think. 2871R is effecient to around 21psi from doing compressor math. You definitly have one of the fastest 2871R setups ive seen.

[DrifterProdigy85]

Actually boost leaks effect the engine alot if your running MAF still. What happens is the MAF senses the air going into the Turbo then if air leaves anywhere before the Intake Manifold your not getting as much air into the motor as the MAF originally read which creates a rich effect from more fuel being added then actually needed. I had around 3-4 small leaks in my IC setup which made my AFR run in the 10.9 area then after i fixed them i was running back up to 11.7 area where it should be. MAP sensor cars wouldnt really matter much since there based on getting the air measured at the intake manifold.

[s13envy]

update guys! got rid of my old setup....going with sc61, 38mm wastegate, 810cc inj, ect!

The 2871R was an awesome turbo for me, but for some reason I decided I want more power lol..Its a sickness

[steve shadows]

Originally Posted by s13envy

update guys! got rid of my old setup....going with sc61, 38mm wastegate, 810cc inj, ect!

The 2871R was an awesome turbo for me, but for some reason I decided I want more power lol..Its a sickness

if you click the shadowerks myspace links in my sig and click on videos there are a couple crappy vids of my car on piss 91 octane with a conservative tune, a little laggy but car was really fast up top. (sc61)

oh and i cant wait paul haha jk

-paul- did you go 2871R .64?

[s13envy]

is your sc61 ball bearing? which wheel on compressor housing is it using?

[steve shadows]

Originally Posted by s13envy

is your sc61 ball bearing? which wheel on compressor housing is it using?

It was not ball bearing (a ball bearing one would just basically be a gt35r). The gt35r compressor wheel is the t61 (sc61) wheel. If your going BB just ge the gt35r the turbine wheel on the 35r is more efficent.

TO4S compressor housing .70 AR standard style. T61 compressor wheel (6 blade same an newer gt35r and gt40r varients). I used a stage 5 t3 turbine wheel with a .63 ar turbine housing. Great turbo for FWY raicng and good for drag.