cant pick a turbo

[malcantry]

So ive finally got to the point where i can match my turbo to my build,.. cant really decide between a few though was hoping to get a few helpful suggestions/input

Ive got a fully built block from a very reputable shop, forged internals and all the supporting mods (+440 injectors)

.. Im planning on at least 300hp and the goal was to be boosting over 20psi, which ive had my pistons rings filed to accordingly ofc

I was leaning between 3 turbos really,

the gt2871r

the gt3071r

and gt3076r

now, i know my engine will probably be within the ranges of the lower two, but maybe pressing it to be really spooling the 3076r??

maybe in the future ill ditch the ssaftc and 440s for a haltch and 800's.. but for now thats where i stand.. i want some real good spool and boost response in regard to my setup.. Maybe the 3071r is my best compromise??

Hows the 3076r feel in these cars?

 

[BRIAN_MP5T]

You will NOT need to go past 16 PSI to get over 300

 

[malcantry]

nobody said i needed to, thats just my goal ;D my engine will be quite capable of 20-25psi, im sure not starting there, but i may end there.. only reason im considering the 2871 is because its still probably within my max hp limits.. but is it happy running that high boost?

 

[tweety2300]

The amount of psi and you're whp goal have nothing in common. A gt35 will make 460whp on 16 psi. A gt30 will make 311 whp on 12 psi. These ate examples from Hondas not protgs

A gt3076 will make more power than a t2871 at 20 psi obviously.

T2871 will be fine for 300-350. Anything past that and you will be breaking transmissions. My goal is 300 and I am going with a t2860 or t2871, I thought about a gt30 but the extra lag isn't worth it for the same amount of power

 

[BRIAN_MP5T]

I thought about a gt30 but the extra lag isn't worth it for the same amount of power

Yes it is, Backpressure and EGT are greatly reduced.

Less backpressure means that the 2.0l engine still moves 2.0l worth of air. Increase the backpressure and the piston isn't able to remove as much of the burning mixture at the top of 4th stroke. Its only able to free up 1.8 or 1.7 L of space for the new air, meaning that turbo has to push even more boost and create even more backpressure and heat. That burning gas is trapped and kept into the 1st stroke where the incoming fuel has to reduce the intake temp, plus stay cool for the next burn stroke.


All of this increases cylinder temperature and the tuner has to compensate by retarding timing or adding more fuel... Both make the tune less aggressive and therefore ...


PSI for PSI the smaller turbo needs to make more boost and put the engine under more risk of damage to get the same HP as the larger turbo.


Get the 3071, the 28 isn't the right turbo for this car.

 

[tweety2300]

O sorry, forgot to add I'm picking one out for a 1.6 not 2.0, probably would have helped me not look stupid

 

[malcantry]

understandably so, if you were to correctly gauge/match a pressure/flow chart of a turbo (these 3 in particular) they show they are all actually within the bounds of what im looking for...

given, i know the 28 is smaller for what im looking for as i would be maxing for max psi.. but since my hp projection is right in the sweet-spot, the best responding turbo

I have been leaning toward the 30 series, in particular the 3071 already, but was just trying to get some feedback (reassurance of what i already know)

anyone have a source for new turbos besides ebay??

 

[JaLMP5]

This guy has a 3071 for sale, it's been there for a little while so i'm not sure if the price is negotiable.
http://www.mazdas247.com/forum/showthread.php?123815656-Quaife-Garret-Rotora-BBK-Perrin-ARP-Fidanza-SteedSpeed-CS-Greddy-TiAL-P-LX-more

 

[malcantry]

just got a gt3071r w/ anti-surge housing

all my engine externals put on/together, im going to be putting my trans, clutch and flywheel on in the next few days

 

[CitizenPro]

Awesome. You plan on making the Houston statewide meet in the next few weeks?

 

[malcantry]

man i wish, im bout 2-3 months to getting it on the road :X

 

[Spiced MSP]

I have a GT3071R if interested. Bought it off a forum member who ordered it from cross over auto