No of course not but in theory the compressors could flow that much Crank HP worth of air if in fact the regular kit is a 2871R unit... But I digress.

 

why would it be interesting they use a larger single turbo than two smaller turbos? Honestly? I mean, what sense would it make for them to run a single 2871R (capable of 350whp or so, max) for the single kit but use two of them on the twin kit? I mean, does it make sense to you that they'd use such a small turbo on the single kit?

 

Good info.

 

Did anyone ever confirm the exact specs of the APS TT Ball bearing Turbos? Im looking into upgrading my compressor housings when the built block goes in and need help figuring out exactly what i need.




Rob

 

Dang, huge bump lol. Are you talking for tuner kit or extreme?

 

Neither, the tuner kit had the sh*tty journal bearing turbos, im talking about the Ball Bearing kit, with the GT28s. I cant find actual specs on them anywhere.

 

Read this thread. May help you a bit:

https://my350z.com/forum/forced-indu...o-or-chra.html

 

The guys @ Blouch showed me a new billet wheel they have that can be installed in the APS housings - $300 per turbo. It may be worth a call to Hal, he was getting CHRA info on the APS turbos a while back, so he may know or the guys at Blouch may know too. Also, you could try and PM Blinkerfuild on here, he has had the original BB kit and the extreme kit and knows his shizz.

 

Can't you upgrade them to gt30s?

 

Yes. I upgraded my APS journal bearing knock offs to BB ~GT3071s. It required getting some custom oil lines made as well.

 

i ended up sticking with the original aps modified gt2871r and made 600whp on a dyno dynamics on e85. it was also over 100 degrees outside. should translate somewhere close to around 680whp on a dyno jet. i really like the power curve, but turbos are maxed out on airflow. made same numbers with c16.

 

^ should have compared to an oxygenated race fuel like Q16 - I believe it will add power even if the turbos cannot provide any more air. Nice #s regardless...

 

From my very limited knowledge of E85, my understanding was that you could make similar TQ from E85 as C16 but not rwhp unless running higher boost on E85?

Could you post graphs?

 

not to derail just caught my interest.

Isn't HP calculated from TQ?

Something like - HP = (TQ * RPM)/5250

If so... and TQ is the same, why would HP be any different?

 

it is, but in most cases it takes more boost to make the same TQ from E85 and the turbos start to run out of breathe before they start making rwhp (above 5252) or atleast i know thats the case with most E85 GTRs and i would assume it is with the relatively small APS turbos we have

 

*double post

 

The ball bearing standard APS turbos are 49.2mm inducer GT2871R (Garrett CHRA PN 446279-31) in modified T25 .64AR turbine housings. I came across compressor housing info once but can't find it again. If I recall correctly, they were from some model of Nissan Skyline.

I confirmed this via measuring inducer and exducer on both the compressor and turbine wheels.

I am 90% confident the APS Extreme kit ball bearing turbos are GT3076R (Garrett PN 700177-7). They are in a .86AR T25 turbine housing with the same compressor housing, modified for size difference of the wheels.

I did not disassemble my extreme kit turbos to measure the wheels, but did the best measuring the inducer of the compressor and exducer of the turbine with my dial calipers.

It could also be possible that the compressor and turbine wheels had a little machine work done to them to get them to fit the housings. I did not confirm this.

As for seeing more torque on the corn burning GTR's, you are seeing the results of boost bleeding off because the compressor can't keep up with demand, or the drop in engine VE because the turbine drive pressure is getting high. The E85 allows taking the turbos to their limit. This can be magnified with alcohol fuels because of the larger exhaust mass.

 

I called my bro today and asked why he went with E85 on his supra, aside from being cheaper he said it makes more HP than c16. For the reasons above and they speculate ethanol having a cooling effect which helps with the higher IAT seen in boosted cars.
/endderailment

 

Guys any idea what the standard GT2871r turbos max out at in boost?? Im running 11-13psi at the moment and my tuner says there only good till 16psi?? Im sure people have run them higher on here??

If they are ok to 17-18 psi I may fit the stiffer forge acctuator springs and re tune to 17-18psi. ??

Thanks.

 

From what I have read before peak efficiency is 18psi

right now I'm running 15psi @ 3k RPM tapering off to 13psi higher up in the RPM
just on wastegate spring with Forge Actuators