GT2871 USERS. SR motor

[codyace]

Originally Posted by Luvs2slide

Is there big differences/gains in using the 52 trim vs the 56 trim compressor housings?

While not exact, this is a compressor map I plotted a few years back



As you can see, the 56 obviously supports the airflow to make good power, while not going beyond efficiency islands. Both spool up similar, so it make sense to run the larger trim wheel, as it dfoes give some top end room

Originally Posted by BlackZenkiS14

I'd like Cody to clarify this comment for me. Is there any truth to it?

For the 100th time, run a JWT or Enthalpy tune. Most of the idiots suggesting standalones don't even have one in their own car, or their car makes 330 whp from a 'custom tune'. There are very few on here that have any decent results with a standalone, and most of them are owners who are able to tune it themselves.

Originally Posted by tabasco122

Question, whats the max amount of boost this turbo can handle? i see most people run between 20-22 psi, is that because its the max efficiency of the turbo, or is it limited elsewhere. IE if i ran e85+meth could i safely run higher boost?

im just looking at options and wondering if its worth moving to top feed msd injectors instead of trying to find some sard or nismo 750's

If looking at the above compressor map (which isn't exact, but prettty 'close') you'll see that there really isn't much more room uptop to make much more HP in regard to airflow/boost...I'd say 22-24 max before the increased boost just become shot air and counter productive.

The nice thing with E-85 is that you can run more timing, which can increase HP. Not so much running more boost, but even a few degrees can make for nice hp gains.

Top feed and fuel rail would be better imo, simply on cost alone. Sidefeeds are super expensive at that rate as well.

Originally Posted by silversr

I take back what I said about my enthalpy ecu. I checked the mafs plug and the wires were corroded . I ordered a new plug and everything is fine now. I repeat nothing was wrong with the tune and Im an idiot.

I'm glad you at least came back on and admitted that. 95% of the time, this is what is always wrong with rom tune cars, and most people initially react to it, without really diving into the issue. I'm glad you went to check out the problems and resolved it.

Originally Posted by Patrick Bowering

and as for setups the things i regret in mine are the freddy intake it just doesnt help response. and staying with nismo side feeds no more side feeds for me. bosch ev14s cheap and awesome.and no 3 inch intercooler piping.

In regard to 'response' there really isn't anything worthwhile on staying with the stock manifold. Sure you may see 100-300 rpm quicker response and it may make more torque 3000-4000 rpm, but in the grand scheme, who cares about that part of the powerband when the turbo isnt' fully spooled until 4000 rpm? I know I know it sounds funny, but I'd GLADLY give up that 'low end' (unusable really) for increased power and torque throughout the 4000-8000. There is just a point where you gotta go for what gives better average HP over the power band, rather than better down low (especially when the stock manifold kills top end on bigger boost 2871r setups.

In regard to Freddy vs Greddy in HP and response? Hardly any. I've replicated mysetup with a Freddy manifold and it made similar peak (almost identical curve) and almost similar torque.