difference between VF 23 and VF 29
18 April 2002, 02:29 PM
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IIRC, VF 29 is a little bit "smaller", so lower boost threshold, less at the top end from my simplistic understanding. http://www.mrtrally.com.au/performan...turbo-data.pdf but the link doesn't work for me at present - I think it had VF29 in there.
18 April 2002, 02:50 PM
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I've dabbled a bit with a VF23, a hybrid-ed VF23, and my own VF24 (roughly the same as the 28/29 IIRC)...and it all depends on what you're asking from it...
The difference in spool up is negligable between my 24 (fmic'ed) and the 23...the TD hybrid is on par with the 24.
At 1.2 there's really not too much in it....but IMHO the difference in flow up high will become larger with upped boost...
So...for my car I've chosen to stay with the 24, and added an FMIC....and I'm not going to run more than 1.3 bar (for now), until I can afford proper internals (and a gearbox).
My car with the 24 at 1.3 is a completely different thing to a VF23 @ 1.2 with a TMIC.
IMHO of course.
Adam, I know what you're going to say - so FO mate.
/J
The difference in spool up is negligable between my 24 (fmic'ed) and the 23...the TD hybrid is on par with the 24.
At 1.2 there's really not too much in it....but IMHO the difference in flow up high will become larger with upped boost...
So...for my car I've chosen to stay with the 24, and added an FMIC....and I'm not going to run more than 1.3 bar (for now), until I can afford proper internals (and a gearbox).
My car with the 24 at 1.3 is a completely different thing to a VF23 @ 1.2 with a TMIC.
IMHO of course.
Adam, I know what you're going to say - so FO mate.
/J
18 April 2002, 03:16 PM
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Jerry,
"The difference in spool up is negligable between my 24 (fmic'ed) and the 23...the TD hybrid is on par with the 24."
So are you saying they spool up about the same then ?
"My car with the 24 at 1.3 is a completely different thing to a VF23 @ 1.2 with a TMIC."
You don't say !!! So does this mean that my car running my turbo, with a completely different setup to you, would be different again ?
Mate........what the hell are you today !!!!!
Mark.
"The difference in spool up is negligable between my 24 (fmic'ed) and the 23...the TD hybrid is on par with the 24."
So are you saying they spool up about the same then ?
"My car with the 24 at 1.3 is a completely different thing to a VF23 @ 1.2 with a TMIC."
You don't say !!! So does this mean that my car running my turbo, with a completely different setup to you, would be different again ?
Mate........what the hell are you today !!!!!
Mark.
18 April 2002, 03:40 PM
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LMAO - Mark...my excuse is being non-limey by birth, and still lacking somewhat in the limey langwitch 
...what's yours?
I was a wee bit disturbed by the bigboss when I was writing that bit regarding the spool up...the regular 23 is a tad later on the spool up...say ~2-300 rpm, the hybrid I tried was on par with the 24.
What I was trying to say is....don't get a bigger turbo than your needs demand, hybrids are v v v nice....but pricey, I went the fmic way instead of swapping the 24 for a hybrid 23.
/J
...what's yours? I was a wee bit disturbed by the bigboss when I was writing that bit regarding the spool up...the regular 23 is a tad later on the spool up...say ~2-300 rpm, the hybrid I tried was on par with the 24.
What I was trying to say is....don't get a bigger turbo than your needs demand, hybrids are v v v nice....but pricey, I went the fmic way instead of swapping the 24 for a hybrid 23.
/J
18 April 2002, 03:55 PM
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Jerry,
I agree about turbo sizing. The problem is that most people have turbo's that are too small, for what they want, and over drive them. In most of these cases, they would be better off reducing the boost, and advancing the ignition.
Mark.
I agree about turbo sizing. The problem is that most people have turbo's that are too small, for what they want, and over drive them. In most of these cases, they would be better off reducing the boost, and advancing the ignition.
Mark.
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18 April 2002, 05:21 PM
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Mark
It is always tempting to fit a small turbo and get the most from it - you get the benefit of a lower spool up speed and you never know what you lost at the top end. You are correct however in warning against the churning effect and getting the desired boost but with high inlet temps.
Duncan
PS According to MRT the VF29 has a smaller turbine housing than a VF23, so will benefit from a lower spool up speed. It should make reasonable power (it was after all fitted to the STi6 in Japan at 280 BHP), but without knowing your power target and other criterea it is impossible to say which is better.
It is always tempting to fit a small turbo and get the most from it - you get the benefit of a lower spool up speed and you never know what you lost at the top end. You are correct however in warning against the churning effect and getting the desired boost but with high inlet temps.
Duncan
PS According to MRT the VF29 has a smaller turbine housing than a VF23, so will benefit from a lower spool up speed. It should make reasonable power (it was after all fitted to the STi6 in Japan at 280 BHP), but without knowing your power target and other criterea it is impossible to say which is better.
18 April 2002, 06:37 PM
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I'm looking for about 300 bhp so the VF 29 will do the job I think if that is what I can make of reading your comments and on a later date, I can change it to a hybrid version
kurt
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