Having your cake and eating it as well...

[Guest]

GT3071 vs vf23

A good example of how technology moves forward

[chrisjunkie]

Damn that looks so nice! Tuned?

[pedro]

Interesting but what is the relevance in comparing a run of the mill vf23 worth $200-$300 to a gt3071 at $2200.

[Scoobydoo]

Also what else was changed between the two setups, apart from just the turbo?

[Guest]

You can get a vf23 for $300 new.... ?

[pedro]

Can you buy a secondhand GT3071?

[Joker]

will the questions never end?

but yes a 23 for 300? where

[pedro]

Trademe #356749745..$350...no bids...closes tomorrow.Offer him $300.

[GC8E2DD]

"Boosted to 18psi every day" - doesn't sound very new.

[Guest]

Yes you can buy GT30s secondhand - lol

There is even a gt28 for sale on CS

http://www.clubsub.org.nz/forum/index.php/topic,19396.msg272125.html#msg272125

[pedro]

Bits of turbo for sale.

[funkytown]

nice post qwerty, as a user of a vf23 - and mine was even modifed reconditioned new - cost me around $1000 and the curve is identical if not worse than qwerty's and comparing to my gt3071 its just the same.

a GREAT example of technology moving on. I'll try to put my comparison graphs together.

pedro - a new vf23, go to D&T and ask them what its worth.. around 2k when i asked. my gt30 new when i bought it, about 2k

[pedro]

Fair enough

[nt_a_foz]

I think the main point of this post pedro is that the graphs are similar down low then you get a heap more up top.

Traditionally "big " turbos have a heap of lag so you only get top end.

[WRXONP]

have u got boost curves?

[Guest]

1bar about 3700

[funkytown]

 Qwerty said:

1bar about 3700

which is actually irrrrrrrrrelevant... it could make 1bar at 5700 for all i care. What your graph is showing is that the gt3071 is putting down more power at every rev point compared to the vf23.

By chance what do the torque curves look like compared qwerty?

WRXONP - recognise the vf23 curve by chance? :-X

[BC5RA]

Pedro and WRXONP.

Put some thought into your posts or they will be summarily deleted.

[Guest]

 funkytown said:

By chance what do the torque curves look like compared qwerty?

The vf23 makes peak torque at about 4500rpm but by 7000rpm its making 25% less torque. So as the revs rise it drops away especially from 5500 onwards.

Whereas the 3071 makes the same torque at 4500rpm and 7000rpm. So pretty flat curve

[Guest]

So we can see what the more modern garrett can do versus the vf23.

What about a more upto date IHI turbo the vf34 ? Which is slightly bigger than the vf23. So in theory not spool as well...

As we can see the vf34 has quite abit more midrange power the 3071 only beats it at the top end.

IMO vf34 is a damn good turbo for a 2.0 street car.

vf23 = blue vf34 = pink

[funkytown]

would be interesting to see the rev points on there.

for all those td05 lovers can we over lay one of those?

 Qwerty said:

IMO vf34 is a damn good turbo for a 2.0 street car.

agree - it certainly shows. like before - what of the torque curves on this comparison?

[Guest]

As a guide the pink plot dots = the rev points 3500, 4000, 5000, 6000, 7000

The blue plot has an additional points at 3000 and 4500.

[Guest]

It gets a bit messy but in purple is the torque curve of the vf34. Very high peak figure falling off.

Since power = torque x rpm you can see the relationship here.

Torque is higher for the vf34 low down so it make more power there vs the others. The 3071 makes a heap of torque up high so it makes more power up high.

[Guest]

Got a curve for the VF22?

Wouldn't mind seeing where the torque drops off

[GC8E2DD]

I want a 34 for Christmas (36+P18 will do Santa).