Keuzy

Quick parts list first of all...
1.6 10.5:1 built bottom end, gt2871r, flyin miata intercooler kit, TS BOV, stock valvetrain, stock intake manifold, stock TB

So I chose the bigger turbo cause I'm aiming for higher power, ~350, but this boy really do be surging when I get up on the boost. 20psi and up, my mans starts gobblin like a turkey, and the manifold boost/vac needle cha-chas not so smoothly. The bitch flies, though, and responds great to additional boost above this point.

I probably got the wrong turbo, right? I mean my goals are a bit ambitious, I understand, but that dude with the 500+ 1.6, Mattman, he didn't seem to have this issue in his dyno videos, and he got his **** on stock cams.

Anyway, if you know something I don't please feel free let me know below.

technicalninja

Thank you!
I haven't laughed that hard in a while...

You hit the "surge" line of your turbo.
Hit it HARD!
Bigger motor is the best fix.
Smaller turbo is another.

Great description however...

Keuzy

you think a 2860 is still too big?

cpierr03

You may be able to find an anti-surge housing from ATP Turbo that might help

Newaza

If you are in fact encountering compressor surge an anti surge housing as has already been suggested is definitely a step in right direction along with maybe the next larger a/r turbine housing. Will be a little less responsive, but rpm's will be higher when coming on boost, which should help as well. Dont know how you have everything set up but you can fake a larger engine in so far as flow through the compressor by releasing some of the flow with a simple solenoid valve post turbo but before throttle body or any sensing devices. Once rpm is high enough to be past surge line just close valve. Just need a rpm map or switch of some sort. Some big time 4 cylinder drag racers are doing something along this line. Personally I wouldn't call a 2871 too big.

Full_Tilt_Boogie

iTrader: (1)

I second all this.

Ive tuned a B16 with a GTX35, so a 2871 is not inherently "too big" for a 1.6L engine.
The issue is the 2871 is a big compressor on a small turbine. Just going to the next size up exhaust housing should make all the difference. Either that or get a 3071 which can still be had with a t25 flange.

Keuzy

Looking through the ATP catalog, I cant find an antisurge housing that isnt for the special 52 trim. Do you suggest going with the bigger turbine housing nonetheless?

Full_Tilt_Boogie

iTrader: (1)

I feel like the turbine housing is fixing the problem at the source, as opposed to the anti-surge compressor housing which is more like a band-aid.