300hp from a stock vnt

[3.0Duster]

is 300hp possible out of a stock vnt?

[Dan Culkin]

300whp? No way.

300hp? Like 240whp? Possibly.

[3.0Duster]

im already making about 240hp wit my vnt, and all i got is exaust and a computer, but i guess running at 18psi will kill my vnt eventually, i wonder is the vnt28 worth the upgrade performance wise, id like to keep the car with its vnt status but i need more power, but for the price it seems a conversion to turbo II would be cheaper, whata ya think

[Subliminal]

I think that a properly setup t2 system doesn't really have much more lag than a vnt system...my thoughts after owning both.

vnt, as stock, has great spool up time, and is pretty durn fast. a t2 with a nice open exhaust and a little intake side work will spool almost as you step on it too.

Conversion to t2 seems to me like all it requires is a different turbo, and you're done.

d

[Dan Culkin]

subli, no way! If that was true, your VNT was not working properly.

[Subliminal]

With a nice t2 setup, it takes, what, a second to hit full boost when you romp on it? A VNT can do it in 1/2 a second?

Sure, it's not as fast acting as a vnt, but when you're talking .5 seconds on the street, or even a whole second, I don't really think it's that much.

Now, I'm taking stock VNT to modified t2.

Anyway, matter of opinion, i suppose (the only t2 I've driven has been with a 2.5 and it's been a while since I drove a vnt.)

d

[DirectConnection]

Quote:

Originally Posted by Subliminal Anyway, matter of opinion, i suppose (the only t2 I've driven has been with a 2.5 and it's been a while since I drove a vnt.) d

Ah! 2.5 is the variable. 2.5 helps spool the turbo so much easier than a 2.2.

I own 2 VNT cars and notice that above 3,800, the lag difference is barely noticeable. Under that , and the T-II takes some time to build full boost, where the VNT is still almost instantaneous.

[DirectConnection]

Quote:

Originally Posted by Dan Culkin 300whp? No way. 300hp? Like 240whp? Possibly.

Dan years ago, a certain vendor told me they built 2 VNT Daytonas that ran low 13's when they had "in house" servicing . I think they even told me it was on 15psi. I wanted to belive it then, but do not now.

300whp.... not possible. 240whp? Only if it's 20 below outside with alot of other upgrades done to the car. I have done alot to my car, but no major $$$ mods and probably make 195 whp. If I added a Spearco, bigvalve 200+cfm head, intake mod, I still doubt 240whp on the stock VNT. If you could somehow free up the backpressure in the turbine housing, and installed a different compressor wheel, then 240whp is doable.

[DirectConnection]

Quote:

Originally Posted by 3.0Duster im already making about 240hp wit my vnt, and all i got is exaust and a computer, but i guess running at 18psi will kill my vnt eventually, i wonder is the vnt28 worth the upgrade performance wise, id like to keep the car with its vnt status but i need more power, but for the price it seems a conversion to turbo II would be cheaper, whata ya think

I have no experience with the VNT28, but everyone I have heard that ran one of these had major issues trying to control it. One member here has one, and seem to be the closest to having it perform correctly, but I think he's still having some issues.

One problem with that turbo is basically the fact that the stock turbine housing has issues with all the backpressure. This is why VNT's like to overboost. Add a better compressor wheel, and for the same psi of boost, the better compressor wheel will *need* to do this at a slower shaft speed, right? But the turbine side is still restrictive causing the high shaft speeds that were prevelant with the stock compressor wheel... making overboost situations even harder to control.

[Dan Culkin]

Quote:

Originally Posted by DirectConnection Dan years ago, a certain vendor told me they built 2 VNT Daytonas that ran low 13's when they had "in house" servicing . I think they even told me it was on 15psi. I wanted to belive it then, but do not now. 300whp.... not possible. 240whp? Only if it's 20 below outside with alot of other upgrades done to the car. I have done alot to my car, but no major $$$ mods and probably make 195 whp. If I added a Spearco, bigvalve 200+cfm head, intake mod, I still doubt 240whp on the stock VNT. If you could somehow free up the backpressure in the turbine housing, and installed a different compressor wheel, then 240whp is doable.

There was a fellow that was on this board (or FMML, I forget) that had a Daytona VNT that was really quick. He had an open exhaust, big intercooler, cal, etc. I think he might have been in the low 8's in the 1/8th ... "soupcan" was his username? I'd bet he was better than 240whp.

There was another guy with a lebaron VNT, with an opened exhaust, and an old ND 18psi cal, I think he was running 102mph in the 1/4. That's gotta be around 240whp as well.

I think 240whp with a VNT is kind of like 300whp in an R/T with the stock turbo - at least one guy has done it, a few guys have approached it, but it's really pushing that turbo to its limit!!

[3.0Duster]

from what i can gather the vnt system is great for daily driving purposes but its not practical for more then 200hp, my goal is above 300hp so it seems clear i need a turbo II, thanks for the info

[iTurbo]

What if you bolted a VNT onto a TU header setup with an external 'helper' wastegate? Would that free up some HP and/or make boost easier to control?

[Dan Culkin]

Nah, I can't imagine any header setup would do much for freeing up HP with a VNT.

[ScottD]

Quote:

Originally Posted by Dan Culkin There was a fellow that was on this board (or FMML, I forget) that had a Daytona VNT that was really quick. He had an open exhaust, big intercooler, cal, etc. I think he might have been in the low 8's in the 1/8th ... "soupcan" was his username? I'd bet he was better than 240whp.

On this board or the FMML, you forget??? I thought you were God????

What a crock.

[Dan Culkin]

Saint Scott, you'd better watch yourself. Walk carefully during the next lightening storm, buddy (that's an old trick Zeus told me about).

-God, until proven otherwise.