Author Topic: vnt turbos  (Read 5901 times)

jonnyshaw49

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vnt turbos
« 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

5teve L

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« Reply #1 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.

James5

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« Reply #2 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 @.

jonnyshaw49

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« Reply #3 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

5teve L

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« Reply #4 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)

James5

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« Reply #5 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

markeyturbo

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« Reply #6 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

Mattuce

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« Reply #7 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:

jure

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« Reply #8 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?

5teve L

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« Reply #9 on: 17:03, Tue 20 January 2009 »
He doesn't Jure, thats why he pops liners  :P

James5

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« Reply #10 on: 18:04, Tue 20 January 2009 »
Quote from: "5teve L"
He doesn't Jure, thats why he pops liners  :P


 :lol:

markeyturbo

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« Reply #11 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.

James5

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« Reply #12 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.

jure

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« Reply #13 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.

jimmy_b

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« Reply #14 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