GT2871R: How much power have you put down?

[fliprayzin240sx]

Ive searched around but couldnt find anything. How much power has people put down on with this turbo and at what psi on a SR20. Im curious cuz I got the .63 trim and put down 284 whp @roughly 12 psi.

[TUnity2]

what motor cool guy?

[fliprayzin240sx]

k smart guy...SR20DET...not like the KA guys would rock this turbo.

[Ian]

yeah KA-T=T3T4


one of my co-workers made a little over 300 whp IIRC w/ an Enthalpy ECU and no tuning afterwards

he's also got some cams.

[wootwoot]

You arent in the efficency of the turbo yet so you wont see very good numbers. The max efficency range of the GT series turbos generally runs from 14-22psi depending on those 17895403 variables. Put that beast at 15psi and you'll have way more fun

[fliprayzin240sx]

Originally Posted by mainevent212

yeah KA-T=T3T4


one of my co-workers made a little over 300 whp IIRC w/ an Enthalpy ECU and no tuning afterwards

he's also got some cams.

See thats the thing, im running enthalphy ecu and i know it needs to get fine tuned cuz im running hella rich. Im not sure how much boost i can push on this setup on street gas. thats why im curious to see what people have done.



Its a crappy pix but i put down 284 on bout 12 psi w/ my safc on -5% across the board. Started running richer after 5.5k.

[Angel]

Check for a boost leak. You should not be that rich with enthalpy's rom tune. I have the some turbo with fmic, turbo back exhaust, z32 maf, 555cc, and jwt s3 cams along with enthalpy's rom tune and my car makes 352 rwhp at 18ish psi. Now if you were to turn it up another 6 psi you should stand to pick up another 60 hp or so. And for reference, my af ratio is at 12.0 all the way to redline while in boost.


edit: actually looking at your graph you don't seem that rich. you end the run at what looks like 11.8.1, if anything a little lean as boost comes in

[Siizzzoooo]

actually, theres a guy who is running this turbo on his KA-T, seeing good results too

[Johny5]

something like a gt32 is more properly sized for ka displacement, but congrats on the numbers on the 2871 thats still nothing to be completely dissapointed about with your psi.

[fliprayzin240sx]

Originally Posted by Angel

Check for a boost leak. You should not be that rich with enthalpy\'s rom tune. I have the some turbo with fmic, turbo back exhaust, z32 maf, 555cc, and jwt s3 cams along with enthalpy\'s rom tune and my car makes 352 rwhp at 18ish psi. Now if you were to turn it up another 6 psi you should stand to pick up another 60 hp or so. And for reference, my af ratio is at 12.0 all the way to redline while in boost.


edit: actually looking at your graph you don\'t seem that rich. you end the run at what looks like 11.8.1, if anything a little lean as boost comes in

K...one last thing...are you running some kind of fpr? If you are, whats your rail pressure at? Last time I checked for leaks, i had a slight leak on my nismo fpr *pretty sure thats been fixed* I need to get this sheit into a shop to get it fined tuned and run my damn HKS cams.

[Angel]

Originally Posted by fliprayzin240sx

K...one last thing...are you running some kind of fpr? If you are, whats your rail pressure at? Last time I checked for leaks, i had a slight leak on my nismo fpr *pretty sure thats been fixed* I need to get this sheit into a shop to get it fined tuned and run my damn HKS cams.

Just running the stock fpr. So I would suggest setting your fuel pressure to stock unless enthalpy told you to do otherwise.

[powerls]

I believe the most I have seen is 400ish. But that is with a .86 A/R, greddy mani and cams. But you definately need to up the boost a bit. Is there any reason for the low boost on your setup?

[fliprayzin240sx]

Just had the chance to screw around with the duty load on my AVCR without having it spike. For my rail, iirc i got it around 50 psi. Hey angel, is that 18 psi for boost on street gas or race?

[ryan hagen]

my ka24de-T should be gt2871r powered by mid next week, still puttin every thing in the car..................i have the .86

[Var]

you can get away with 18psi on street gas with the right tune. Should be no prob. People run over 20psi on street gas.

[Angel]

Originally Posted by fliprayzin240sx

Just had the chance to screw around with the duty load on my AVCR without having it spike. For my rail, iirc i got it around 50 psi. Hey angel, is that 18 psi for boost on street gas or race?

Can't remember off the top of my head what the stock fuel pressure is and I am at work so I can't really take the time to check. I am sure that it has been posted here a million times so you may want to look for it, but I would think that as with most fuel injected cars that the base ( no vac ) pressure is probably around 40-42 and maybe 36ish with the vac hooked up.

As far as the octane I was running on 18 psi, it was 93 octane fl pump. I have pushed my luck a couple of times and run as much as 22 psi on pump. Not that I am suggesting that anyone else does this, but I have gotten away with it. I always keep the pulls short and in lower gears to reduce load and time at wot when I have done this fwiw. Btw, the comp is around 160 in every hole.
I would stick with 14 psi around town daily and run 18 when you want to have more fun, if it's not strong enough for you then look at enhancing efficiency with cams and mani changes and the like to make a little more at the same boost. If still not enough.... go bigger

[JT410]

I always here these similiar WHP results with the 2871r .64. My brother and I both have the 2871r .64 on red top SR's running 18psi with top speed intake mani's Apexi power fc's and all other necessary upgrades and we only dynoed at 280 whp. AFR in the low 11's under boost. I always thought this WHP number was a bit low but my motor runs perfectly fine. So I dont get why our numbers are so low.

[ISTOTOSAO]

Originally Posted by JT410

I always here these similiar WHP results with the 2871r .64. My brother and I both have the 2871r .64 on red top SR's running 18psi with top speed intake mani's Apexi power fc's and all other necessary upgrades and we only dynoed at 280 whp. AFR in the low 11's under boost. I always thought this WHP number was a bit low but my motor runs perfectly fine. So I dont get why our numbers are so low.

There are different Dynos and they read differently. I don't know any particulars. Just speculating.

Steven

[Var]

different dynoes, plus you can probably get more power by bringing the AFR into the low 12's. and timing..?

[b00st2R]

Im also looking into using the gt2871r for my red top and im wondering is there any quality manifold out there for this turbo. Would the stock manifold work fine or it should be switcch out?

[wootwoot]

stock will work fine but a quality manifold would be Full-Race

[JT410]

yeah the timing was left pretty conservative. there were only a few changes made

[Angel]

Originally Posted by b00st2R

Im also looking into using the gt2871r for my red top and im wondering is there any quality manifold out there for this turbo. Would the stock manifold work fine or it should be switcch out?

I am running stock intake and ( more relevant to your question ) stock exhaust mani's. I would say go with full race or peak boost if you can afford to, if you can't you are probably better off staying with the stocker. Not saying that with this turbo you stand to gain all that much with an exhaust mani so it may not be worth it to spend full race money...

[Angel]

Originally Posted by JT410

I always here these similiar WHP results with the 2871r .64. My brother and I both have the 2871r .64 on red top SR's running 18psi with top speed intake mani's Apexi power fc's and all other necessary upgrades and we only dynoed at 280 whp. AFR in the low 11's under boost. I always thought this WHP number was a bit low but my motor runs perfectly fine. So I dont get why our numbers are so low.

What kind of dyno was used? Sounds very low. But as was mentioned already, if it was one of the lower reading dynos and the timiing was too conservative the two things together could easily lower you numbers. I mean those are s14/s15 T28 numbers that are often times hit at a lower boost pressure.

[b00st2R]

Im only looking for around 300-350whp on pump gas, so the stock head/intake/turbo manifold should work fine right. I know that upgrading the cam and instake manifold would help a lot since the stock one start dropping off at like 6000.

[Angel]

Originally Posted by b00st2R

Im only looking for around 300-350whp on pump gas, so the stock head/intake/turbo manifold should work fine right. I know that upgrading the cam and instake manifold would help a lot since the stock one start dropping off at like 6000.

Yes you can easily break 300 with those stock parts, I would however suggest some mild cams like stage 1's or jwt s3's or s4's as they make the car much more enjoyable not only because of the hp increase but because of the powerband change.

[fliprayzin240sx]

Im running 740cc enthalphy set up with MR mani, elbow, full exhaust, blitz fmic and greddy intake manifold, just seem kinda low for the set up. Well imma see wussup after i get this set of HKS step 2 272s in and some fine tuning. Im just hesitant to push anything over 14 psi on cali 91 shiet gas, plus the fact that ive already gone tru a \"couple\" of SR bottom ends.

[Onryou]

Enthalpy ECU,550cc nismos, toda 272s, GT2871R .64

Giving that and the ECU not being tuned for the cams,
new dyno = 14psi, 311rwhp. I'm expecting around 330-340ish when its tuned well, which is more than enough for me. The dyno doesn't really mean anything anyway, its just a referance to see how the change of the air/fuel and the timing is effecting the cars performance. The real HP and ftlbs are different when you are actually driving.

[TheSpeedFactor]

those aren't bad numbers Eric. I look forward to seeing your car out there with this setup man. should do very well.

We have had tremendous success with the GT2871. We have sold dozens to members of this community and have installed quite a few locally as well. This turbo gives tremendous throttle response and 350whp is a very realistic number for this turbo.

happy boostin.....

-Marti

[ryan hagen]

what is the wastegate on the gt2871r set at stock?