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Gtx3076R Pick My Tune Apart Please

Selleck 34GTT
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scotty nm35 Grand Master

scotty nm35

Posted
Posted

At the end of the day it just flows X amount of air through the compressor, how much of it the engine can't ingest gives you the boost figure. I couldn't run more than 23psi on the final tune with the GTX3071 with 1.06 rear, the compressor was way out of efficiency and it made less power from heating the air with no benefit.

I just slotted the GTX3076 with .82 rear in today so I will let you know the outcome Wednesday hopefully. I can already tell its much more responsive... :)

AngryRB Grand Master

AngryRB

Posted
Posted

giddy up, will be watching for your results, one day mine will get tuned too to add to the GTX results. Just need a resonator and wait for a dyno to be available, they all booked out in brissy for winterinternationals and jamboree i think.

AngryRB Grand Master

AngryRB

Posted
Posted (edited)

he first tuned it without E85 and made 288kw with a 0.82rear on about the same boost,

4300rpm to get 200kw so they are comparable , take 20kw off for the rear housing difference and its very close, take into account a slipping clutch was was noted, and they would be very close at that point.

so looks like the two are not far apart, and personally the sound of the 76 even in GTX form is awesome. :whistling:

Edited by SliverS2
scotty nm35 Grand Master

scotty nm35

Posted
Posted

I should be able to get an overlay of both graphs but I can feel the .82 is perfect, probably for either turbo, and as they have the same turbine, they should feel much the same on the road.

Mine with the stock airbox is still silent. :(

Mitcho_7 Mentor

Mitcho_7

Posted
Posted

So you both will be running .82 ext. gates in the gtx3076? Interested to see the results.

Was mickos 98 tune with a low mount .82 internal gate? 200rwkw by 4300 is pretty responsive in my view. I know he was pumping a fair bit of boost, but that might have just been on e85.

JonnoHR31 Grand Master

JonnoHR31

Posted
Posted

a .63 housing on a gtx3076 is a little silly. you'd be much better off with a gtx3071 or a normal gt3076 as with the .63 you'll be limited to a fair bit less than the x76 compressor can flow.

still, not a bad graph considering. the advantage is when you want a little more you can simply bolt on a bigger housing and maybe a better manifold and make a fair bit more

simpletool Mentor

simpletool

Posted
Posted (edited)

You could try to up the gain on the boost controller and possibly end up with a slight boost spike. Looks like the boost is set to 18psi but doesn't quite control it near max torque (~45-5000rpm). I suspect the thing is VERY close to compressor surge while boosting and your getting some very slight symptoms from that. With a compressor bigger than a 76mm 56 trim and with a 0.63A/R it'd have to be close to surge.

You can't tell driveability or response from a dyno sheet. How does it FEEL coming onto boost? Does it actually make fast boost at 4000rpm? What are the mixtures like?

Edited by simpletool

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