Vf24 Vs Vf23

[mitch]

Well the other day I changed my VF24 to a VF23 by putting a P20 housing on it. I have been unable to drive it, due to me breaking the banjo bolt for the oil return line :mad: But I got a good run in last night! :P

I found that the VF24 was a very very good turbo for around the streets, came on boost before 3000rpm and pulled all the way to our redline. This was very good for the 10-14 psi bracket! But upon changing it to a VF23, I noticed more lag (obviously) and still pulled around the same for 10 psi. But once I selected my high setting, 16 psi, it was all go! Pulled a lot harder!

So for anyone that wants to have a good daily driver turbo, get a VF24/28/29, but for those out there that want to run a bit more boost, go for the VF23!

I am only changing by turbo, due to a forged engine coming soon! :D

[JESTER86]

Mitch how much do you think the increase in lag is?? 2-300rpm?
did you ever run the 24 on the 16psi

[d_generate]

I'm running my VF23 on about 19-20psi & it loves it, pulled a 13.4 with std computer, only mods are CAI & TBE, colder night would have probably been closer to a 13.2.

[Marv]

How much do VF23s go for (general price range)?

[JESTER86]

i recall seing one recently for $650

[mitch]

jester I have a turbosmart 2 stage boost controller, with missle switch. So for the lower setting I had it on 10 psi and the high setting as 16 psi. When the VF24 was on 16psi it still pulled pretty hard, but obvioulsy not as much as the VF23 due to the shear size of the turbo.

The lag increase was around 300rpm correct, but with a better exhaust than what I have, I am sure that it would spool up a bit quicker :P

Marv I only paid $500 for my VF24 in mint condition. And then I got the P20 housing for a bargain! But yes I would expect to pay around $600-700 for a VF23 :)

[scooby85]

i could be selling a VF23 very soon..... :) still deciding weather or not to go to a Garrett GT2871R... decisions decisions!! anyone here got a gt2871r turbo? Im interested to see how they go in a boxer!

[rstassie]

Interesting comparison Mitch - especially in the same car. With VF 24, 28 & 29 campable I hear of 170-180atw and VF23 180-200atw u don't need 2 much more imo for standard internal motors.

My VF 23 made 132 atw on 14psi with only mods TBE and panel filter (no chip). Compared to my mates V6 stock sti definitely laggier (he also has 4.44 box) but feels a lot more torquey once boost is pumping.

[Bazza]

Found something interesting....

180ATW VF22-P20 @ 18psi

185ATW VF24-P20 @ 18 psi

http://au.pg.photos.yahoo.com/ph/kombiez/detail?.dir=797e&.dnm=4a88.jpg&.src=ph

[shaheenis]

My current setup is a VF28 (aka VF24) on a 2.0ltr that has been running 16psi. Very nice turbo but not intended for more than 17-18psi and more effecient around 15-16psi. Al is building me a 2.2ltr forgy that will be going in next weekend and I am looking to upgrade to a VF23 and I am hoping that with the extra capacity I will get the same characteristics and lag with the VF23 on the 2.2 as I did with the VF28 on the 2.0ltr.

The VF28 isn't a big turbo but it was miles ahead of the old VF10 in top end so I can only imagine what the VF23 is like. I am going to suck it and see for a bit on the VF28 but will be most likely looking to upgrade in the coming months. Although one of the benefits of a VF22 or VF23 is that you can run higher boost, you shouldn't really push the upper limit of a turbo because it will generate too much heat. You want to keep the intake temp down.

Anyone selling a mint VF23, pm me :).

[mitch]

That is a very nice find there bazza! :wink:

Does anyone out there have a pic of the blade design of a VF23? I would like to compare to my VF24 with P20 housing.

And since a VF24-P20 can make more than a VF22, than a VF29-P20 hybrid would be an awesome turbo! Comparing a VF24 to a VF28 is like comparing a VF8 to a VF12. But for the VF29 the changed the blade material, I think to a titanium alloy, (I red that somewhere), so every better characteristics would come from this turbo! :)

[shaheenis]

Comparing a VF24 to a VF28 is like comparing a VF8 to a VF12.

The VF24 and VF28 have identical compressor housing, exhaust housing and size of the compressor and exhaust wheels. Maybe there is a different in number of blades on one of the wheels but a minor difference. The VF24 and VF28 are near identical afaik they are identical.

I don't think the VF22 is ball bearing either so the spool characteristics on a modified 23, 24, 28 or 29 should be better.

[Hodgey]

Mitch, if you go to the MRT Website, they have photos of the VF23 from the front. THe blade design is identical to the VF24. The only characteristic, and I mean only one, that separates the two is the exhaust housing!

[mitch]

Nah tim, the VF22 is bb, it just has massive blades, so that's why it take's so long to boost up!

Good to see you bringing something constructive to this thread hodgey!

I had a hunt around and this is a VF23

http://i42.photobucket.com/albums/e326/mitchm48/1991%20liberty%20rs%20turbo/vf23a.jpg

and this is my VF24, (sorry about the size :( )
http://i42.photobucket.com/albums/e326/mitchm48/1991%20liberty%20rs%20turbo/vf24gx1.jpg

Can anyone spot the difference?

[DWBN]

pe18/20 ftw

[Hodgey]

Good to see you bringing something constructive to this thread hodgey!

Always!

No difference. Read it for yourself mate


VF23
This turbo is considered a great all-around turbo. Like the VF22 it utilizes the largest P20 exhaust housing. This housing is mated with a smaller compressor housing of the of the VF24 for fast response and excellent low and mid-range performance. It does not have the same top end power of the VF22, but spools up significantly quicker. Standard ball bearing center section. Excellent bolt-on replacement for the standard WRX turbo on cars without any other major modifications. Expect flows around 430 CFM at 18 PSI.

6 blades on both VF24 and 23
http://www.westminsterspeed.com/mrt_tech/turbodata20402.pdf

This above document shows the comp wheel size to be 46.7mm on both the 23 and 24 hence the same comp wheel. Also Mitch, there are pretty pictures in there for you cos I know you love pictures!

Search FTW

[mitch]

I know there is all these stats online, but I tend to disagree with them. Even at 16 psi it pulls so much harder than the VF24, to the stat saying that they are only 5 cfm differnt at 18psi has to be a mis-calculation IMO!

[shaheenis]

Ah but you didn't have the 20g wheel did you? The VF24 is quite a different turbo from the VF23 without any modifications. Change the exhaust housing and they are almost identical. The VF23 is quite a big bigger off the shelf.

[scooby85]

23's ftw! decided im keeping mine in! woo! :P what good mods can u do to a 23 to make more ponies?

[Raz]

bah all this talk about pissy little turbos!
You are all still slow! Thats my constructive addition to this thread!

[JESTER86]

The mighty one has spoken! lol

[d_generate]

23's ftw! decided im keeping mine in! woo! :P what good mods can u do to a 23 to make more ponies?
Stick an extra olive in your turbo line.............upped mine by about 3-4 PSI.

[vaccine]

vf22 is a dinosaur.

[shaheenis]

23's ftw! decided im keeping mine in! woo! :P what good mods can u do to a 23 to make more ponies?

Hi-flow or sell to me and buy an AVO or Garett.

[mitch]

Ah but you didn't have the 20g wheel did you? The VF24 is quite a different turbo from the VF23 without any modifications. Change the exhaust housing and they are almost identical. The VF23 is quite a big bigger off the shelf.

that is what I did tim, I got a P20 housing off ebay :wink: