Why all the "big" turbo kits @ low boost

[mrk1]

I never liked this App, I want to see all the maps at the end even if it's way off.

[diss7]

Originally Posted by mrk1

I never liked this App, I want to see all the maps at the end even if it's way off.

Yeah, I found that annoying as well. For example, it wouldn't let me pick the gtx3076r with the above parameters.

But it does give you all the manual data figures (shown in first post) so you can just print the comp map of the turbo you want to plot, and insert the plots yourself. I also use this method to do a more complete plotting, than the app allows; by changing parameters, recording results, then manually plotting it all.

Like the ones I did when I was set on the gtx2863r...

[mrk1]

Yeah printing is the way to go, accept mine now looks like it's covered on chicken scratch not like yours.

There are few online calc's and I do the garrett the best for what it's worth

[mrk1]

3576 with 10,18,22psi on pump. Keep in mind this is my math for what its worth.



Flirting with the surge line but that can be dealt with by being in the correct gear.

[mrk1]

@diss7 just by looking at your graph I see what your going for, data points for 3k rpm. I started at 4200 and stepped up to 8k.

[diss7]

Originally Posted by mrk1

@diss7 just by looking at your graph I see what your going for, data points for 3k rpm. I started at 4200 and stepped up to 8k.

Ah yup, was just about to ask you what your points actually were.
The 2nd and top plots IMO don't share the same parameters by the looks. Looks like top one is e85 and 2nd is pump, or something like that.

Being the gt35 I think you'll be fine with surge line. The same map with the gt30 turbine would be a different story I think. This is why I don't like the gtx3076r, certainly not with a 0.64 a/r. 0.86a/r might delay boost just enough to avoid surge.

Perrin have done quite a bit of testing on these specific turbos. Here's a graph that shows where each spools on an sti, realitive to the other options. No surprised but good to see anyway.

My 3071r isn't shown, but would be further to the left, as smaller comp wheel and non anti surge housing.

[TRD_07]

@diss7, ptunning just made 355hp @10psi on pump 93 with a gtx3076 but I'm not sure if it was the 0.63 or what? My 350hp goal seems more realistic now.

[mrk1]

Originally Posted by diss7

Ah yup, was just about to ask you what your points actually were.
The 2nd and top plots IMO don't share the same parameters by the looks. Looks like top one is e85 and 2nd is pump, or something like that.

I actually tried to match your parameters I could read on the side of your picture there. I just used a different rpm range and only pump gas. I don't really pay attention to the HP figure in that calculator I just play with that number to adjust the boost that comes out on the other end.

Also I plotes those points by eye with a ms paint so there is a margin of error.

[cdrazic93]

Originally Posted by TRD_07

@diss7, ptunning just made 355hp @10psi on pump 93 with a gtx3076 but I'm not sure if it was the 0.63 or what? My 350hp goal seems more realistic now.

Not sure if this is correct, but I read that thread and somewhere there was a post explaining a typo, not 355, but 335 whp @ 10.5 psi on the GTX3076