Garrett turbos comparisons.

[funkytown]

wasnt the point. ignoring all the other factors people are bleating about, and pretty much trying to ignore the actual numbers they were returning, i was interested in the relative shape of the curves to each other and the relative (but crude) inference of boost thresholds between the different wheel and frame'd GT's we have around the club now.

[tez n u]

Are you able to post up your dyno sheet funky?? Wanted to see how your power and torque curve is.

[B4 2000]

 funkytown said:

wasnt the point. ignoring all the other factors people are bleating about, and pretty much trying to ignore the actual numbers they were returning, i was interested in the relative shape of the curves to each other and the relative (but crude) inference of boost thresholds between the different wheel and frame'd GT's we have around the club now.

It's not that easy comparing them, you need the different turbos on a single engine for a fair(ish) comparison. As the variables are kinda endless. Eg, heads, cams, cam lift, bore, CR, pipings, general condition of engine, stroke, fuel, etc.

I'm surprised that you want to do this comparison funky, as you know well it's not just a matter of collecting plots and overlaying them and come up with some sort of result. ???

[funkytown]

im not hoping to prove a result. you've still missed the point. In its simplest form and related to your point - the dyno results thread is an utter waste of time and inferring anything is complete rubbish. Yet you deem that thread acceptable ??? Its the same infinite number of variables you refer to in this thread.

But, if i can loosely get a bunch of 2.0 EJ motors with close to factory heads, and a form of GT strapped on board then im just interested to see what changes can be crudely seen (not proven) from overlaying a few curves.

Ignore that its garretts, you could go TD's or VFs or whatever.

What im interested in looking at is what happens when you change the ratio of turbine wheel to compressor wheel size (dont complicate it by adding trim and blade numbers, start simple stupid). There are lines of thought that say a VF with a p20 sized housing is too small to support anything larger than a large 16g wheel (im definitely not trying to prove it is or its not here, just stating what ive heard.) If we had results in the same spectrum to look at consecutivly surely is more informing than one result in space). You can translate that to a garret and say a gt2882 (if such a thing existed) might be mis matched. , a td0630g etc etc etc..

If i can find results across the spectrum of more balanced (what ever that means) combinations to very unbalanced wheels i think it would produce an interesting discussion outside the norms of "bro, what cc rating are green injectors?" usually seen on CS.

In looking at whats going on i personally think EGBP plays a huge part in that experiment but i dont have access to measure that; and we know the ej257 seems very sensitive to high EGBP, so lets start simple - Perhaps i'm looking for crude results now so we could drill down (investigate) into 'anomalies' down the track?

b42000 - think about ways to join the discussion / offer solutions or thoughts that contribute / be interesting than just ignorantly poo poo'ing the idea?

Im sure Steve has masses and masses of IP to input on the topic and reference units hes built but i dont want to make it personal - thats unfair on his work. so global factory units seem a good place to start.

If you still dont get the concept then you're welcome to not participate and not say anything, I'll compile what curves i can and read into them what i like.

Does anyone have a curve with a gt3076 run up on an EJ20 they'd share? I have a 1x2871,1x2876, 2x3071, 2x 3082, and 1x 3582 (ej20).

When i was doing my aftermarket turbo selection there was VERY little information on anyone doing 3071's on our motors, but if the club had a small peice of information around the different choices and some results that other people MIGHT expect to replicate if their choices down the track.. dont you think that be useful for everyone? ( you could happily replicate some of this for other turbo manufactors if you wanted)

[B4 2000]

Ok I guess I misunderstood your point, apology.

And yes I do agree with you in sharing our experiences and what worked or didn't work for each of us which would help you, me and everyone else. Gathering ideas and thoughts in one place will be a great help for all.

[tez n u]

Post up your graph funky, have looked over the forums and havent found it so thought id ask you to post it up on here.

[funkytown]

 tez n u said:

Post up your graph funky, have looked over the forums and havent found it so thought id ask you to post it up on here.

I need to request it from Shred, i cant find it for the life of me on my PC. i only have the 27x kw one.

[tez n u]

Ok post up the 27x kw one just want to see the curve.

[funkytown]

thats here already - either in the old dyno thread or my build cant remember where.

[vorigan]

Ok i think have what jon's trying to do

ANY EJ20 USING AND GARRETT GT SERIES TURBO and its result?

that sound right jon?

Dont worry about my stuff jon thats endless as far as combo's go so makes its a tad hard, but i can supply 350kw plus dyno plots ive done but non are garrett based

[funkytown]

lols thats about right Steve. if you had a set or turbos based on a certain branded range with different wheel combinations, td and vf come to mind. that would be super interesting for the masses as well i'd say. by result i mean curve though, not specifically interested in the peaks in isolation.

thats if you could / wanted to share. else il continue as is.

[vorigan]

a lot of the ones i have arent fair due to the add on's they are pretty aggressive engines

[sultan]

i'm interested to see some plots you have of the td06/5 with the same spec as mine, and certainly with the trust exhaust housing too. either 2.0 or 2.5, both interest me

[rex-leggy]

why did your garrett let go jon? was it a fault with the turbo or just that it got a beating ?

curious thats all

[vorigan]

jon's turbo didnt just let go its a common problem with all Garrett GT turbos trust me it'll live to see another day

[funkytown]

Thanks steve

[rex-leggy]

maby let go was the wrong term. is it an expensive common problem to fix?

[vorigan]

no not expensive just more annoying than anything

[slydog]

iv got a garrett to4e on mine havnt had it dyno'd yet hope it works well.

[vorigan]

 slydog said:

iv got a garrett to4e on mine havnt had it dyno'd yet hope it works well.

no reason why it shouldn't there's only 2300 combos you can have with them so if it doesn't easy fix

[Stoffa]

If your after modified turbos as well...

Ok heres my mates v7 sti, running factory engine, front mount, good stainless headers and VF36 P20 Big 16G (evo 16g) MSE Modified, running a Forge Motorsport Actuator with 21psi spring and turbosmart e-boost (i think), also has a silicone intake

Maxed out his injectors but was told there should be more in it

The lower curve in the 1st plots is low boost, 203kw at 13psi, not bad!!

The second plot is his current setup with a power run before the tune

[Stoffa]

We're pretty sure the dip is where the AVCS changes, it was just a safe reflash without playing with the cam timing

[Guest DUSWLO]

Thats not a bad number for 13psi!!that must be a wepon and a half to drive!!

[WRXONP]

What's up with the boost taper on high boost ??? Is it to do with the turbo or the heads ???

[Stoffa]

possibly the internal gate thing I guess, may still be getting blown open

but more likely the vf turbine/p20 housing not being able to flow enough