RENAULT5GTTURBO.COM

GENERAL => General Chat => Topic started by: jonnyshaw49 on 20:42, Sat 17 January 2009

Title: vnt turbos
Post by: jonnyshaw49 on 20:42, Sat 17 January 2009
hi could anyone tell me abit about a vnt and the benefits i was after a t25 but starting to wonder about these vnts. how much should i expect to pay for a second had one in good cond as new there a fortune.  what model should i look for etc cheers
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Post by: 5teve L on 21:40, Sat 17 January 2009
It's not worth trying to get a 2nd hand one as they need lots of mods to fit, unless of course it's already come off a GTT.
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Post by: James5 on 22:18, Sat 17 January 2009
There is 1 on RTOC for sale at the mo for the GTT 550.00 inc delivery matey.

Benefits of a VNT boosts like a T2 low end but you get top end boost like a big T3. You can adjust the boost to when you want it to come in the rev range but don't forget on the VNT there is no gradul build of boost like a normal turbo it wham as soon as boost is there it will ne whatever your full boost is set @.
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Post by: jonnyshaw49 on 22:55, Sun 18 January 2009
what turbos do u recommend for fast road/track days want to beat my mates  rs turbos/ 1.9 gtis etc 0-60 mini gp. wanting 200 bhp
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Post by: 5teve L on 09:39, Mon 19 January 2009
T25 or T28 for 200, but a T2/25 would be better for trackdays & some decent rubber/brakes ;)
You can't have it all (unless you get a VNT, but then you will need to mess with it to set it up)
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Post by: James5 on 12:31, Mon 19 January 2009
Quote from: "5teve L"
T25 or T28 for 200, but a T2/25 would be better for trackdays & some decent rubber/brakes ;)
You can't have it all (unless you get a VNT, but then you will need to mess with it to set it up)


Agree with Steve ref the turbos with the VNT it takes a lot of fiddling to get it to how you want it but once done nothing but smiles
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Post by: markeyturbo on 21:19, Mon 19 January 2009
amen, i've got one and its amazing when you can hit 27psi by 3k... wheelspin in 5th anyone?!

my bro has recently got one for his, and a mate locally has one, and my ex had one too lol
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Post by: Mattuce on 10:32, Tue 20 January 2009
Quote from: "markeyturbo"
amen, i've got one and its amazing when you can hit 27psi by 3k...



 :shock:
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Post by: jure on 12:18, Tue 20 January 2009
When I crush my GT25 think that next one is VNT  8)

Markey, how can you adjust fueling for such sudden boost impact?
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Post by: 5teve L on 17:03, Tue 20 January 2009
He doesn't Jure, thats why he pops liners  :P
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Post by: James5 on 18:04, Tue 20 January 2009
Quote from: "5teve L"
He doesn't Jure, thats why he pops liners  :P


 :lol:
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Post by: markeyturbo on 19:14, Wed 21 January 2009
lol.... only one liner in 3 years so can't be bad lol

mike 48 set up my carb, i think its got a 0.4 main and a 0.8 corrector, and some changes to the second stage enrichment, the side has been drilled and adjusted, i know zilch about carbs i'm going by what i can remember lol.
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Post by: James5 on 20:44, Wed 21 January 2009
It's the same as setting up a carb for a normal turbo you need a wideband afr gauge though.

You adjust the carb to fuel for the boost being run so when on boost  the 2nd stage will come into action (It's not just 2nd stage a/c will need reducing and possible the main enlarging but then the main may not need adjusting)

See 5teveL thread on adjusting carb jets.
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Post by: jure on 22:40, Wed 21 January 2009
I got that part about changing jets and drilling but I know that carb bowl often runs out of fuel under boost and that is reason why I asked how he manages to keep it good under sudden 27 psi.
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Post by: jimmy_b on 23:13, Wed 21 January 2009
i bought my VNT off ebay complete with the downpipe elbow for 350, thinking that even if it needs a rebuild its still going to same me a packet, luckily though it was ok.

its good being able to choose when the boost comes in but ive yet to perfect mine to how i would like it to be
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Post by: James5 on 23:22, Wed 21 January 2009
Quote from: "jimmy_b"
i bought my VNT off ebay complete with the downpipe elbow for 350, thinking that even if it needs a rebuild its still going to same me a packet, luckily though it was ok.

its good being able to choose when the boost comes in but ive yet to perfect mine to how i would like it to be


It does take alot of fettling to get the VNT to boost how you want it to I ended up setting mine up so I would have full 24psi manifold boost @ 2800rpm the torque steer was unbelivable not to sure how markey b manages to get any traction with 27psi of boost.

Even when I had fueling and water injection problems I still managed to get 197.7bhp @ only 16psi.
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Post by: markeyturbo on 00:49, Thu 22 January 2009
Quote from: "Jame5_GTT"
not to sure how markey b manages to get any traction with 27psi of boost.


on a mildly damp day it spins in every gear, i've learnt how to drive it to expect the big kick and can counteract it with less throttle

i do run it at 14psi day to day however, still very nippy and will see off most cars lol
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Post by: markeyturbo on 00:51, Thu 22 January 2009
Quote from: "jure"
I got that part about changing jets and drilling but I know that carb bowl often runs out of fuel under boost and that is reason why I asked how he manages to keep it good under sudden 27 psi.


other than an FSE pressure regulator and a modified float needle not alot has been done... i think its just alot of luck or some sort of renault voodoo lol
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Post by: jure on 07:15, Thu 22 January 2009
Voodoo indeed   8)

How high do you VNT owners rev the car?
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Post by: 5teve L on 08:36, Thu 22 January 2009
James had his car revved to 7800rpms on the rollers  :shock:

I was also about to start to play with an adjustable fuel reg & try different base pressures to see if it would help with a larger needle jet, still got the brand new reg sitting in my drawer as i never tested it :(
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Post by: James5 on 12:58, Thu 22 January 2009
Quote from: "5teve L"
James had his car revved to 7800rpms on the rollers  :shock:

I was also about to start to play with an adjustable fuel reg & try different base pressures to see if it would help with a larger needle jet, still got the brand new reg sitting in my drawer as i never tested it :(


My car being revved to 7800rpm :shock:

(http://i252.photobucket.com/albums/hh25/GTTJames/Track%20n%20Road%2029yh%20March%202008/th_002-1.jpg) (http://s252.photobucket.com/albums/hh25/GTTJames/Track%20n%20Road%2029yh%20March%202008/?action=view&current=002-1.flv)

(http://i252.photobucket.com/albums/hh25/GTTJames/Track%20n%20Road%2029yh%20March%202008/SANY0009.jpg)
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Post by: markeyturbo on 14:36, Thu 22 January 2009
crazy fool! lol

my limiter is set to 7k
Title: vnt
Post by: frix on 15:13, Thu 22 January 2009
i want one, whos gonna sell me one?   :)
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Post by: 5teve L on 17:48, Thu 22 January 2009
Quote from: "Jame5_GTT"
Quote from: "5teve L"
James had his car revved to 7800rpms on the rollers  :shock:

I was also about to start to play with an adjustable fuel reg & try different base pressures to see if it would help with a larger needle jet, still got the brand new reg sitting in my drawer as i never tested it :(

My car being revved to 7800rpm :shock:

(http://i252.photobucket.com/albums/hh25/GTTJames/Track%20n%20Road%2029yh%20March%202008/th_002-1.jpg) (http://s252.photobucket.com/albums/hh25/GTTJames/Track%20n%20Road%2029yh%20March%202008/?action=view&current=002-1.flv)


That was running 16 psi with a spike IIRC & it still made 197bhp...
Compared to mine revving to just over 6k & making 207bhp with a T25 @ 20psi with a boost flustuation up top (bloody Apexi boost controller, you can see it dip in boost if you watch closely)
Clicky (http://uk.youtube.com/watch?v=iOWwQczNuRo)
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Post by: markeyturbo on 19:08, Thu 22 January 2009
here is mine...


http://uk.youtube.com/watch?v=DLdAbSx6jAE (http://uk.youtube.com/watch?v=DLdAbSx6jAE)

http://uk.youtube.com/watch?v=DLdAbSx6jAE (http://uk.youtube.com/watch?v=DLdAbSx6jAE)

you can hear the VNT 'pop' onto full chat.

the start bit is funny.. the dyno operator aborted the run as he didn't realised that it spiked to 30psi and thought there was a problem lol
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Post by: markeyturbo on 19:10, Thu 22 January 2009
just watched them and they aint actually power runs... but here is one:

http://uk.youtube.com/watch?v=ea1EO8OhRKw (http://uk.youtube.com/watch?v=ea1EO8OhRKw)