Gt42

[will20v]

i ran a gt4094 at 25 psi and did 635bhp. i now have a gtx4202r and will make around 950 bhp . unless you have £15000+ sat in your bank or cash under your bed then forget the gt42 as thats the least it will cost. trust me i know . swap your gt42 for a gt35 and it will still make you do a little wee in your pants dont worrie

[bigcooler]

Ok guys I have taken note and thank you all for your advice

[speeding-g60]

being one of these guys with ~850+ AWHP setups, like Jo said even if this turbo was free AND they paid you a thousand bucks to take it from them, it would not be very good for much BUT a full out drag car (like what i have/run).

really, instead of trying to build a car or motor around a cheap/free part such as a turbo, what you REALLY need to do is decide a use and level that you want and CAN AFFORD, and build towards that end. you will SAVE a lot of money doing so, and not waste money on stuff you dont really need.

just my $0.02 its always free and hardly ever liked

[Jonnybravo]

I think a well set up engine with about 500-550 will make you poo your pants .

Allso is the car set up for more power ie brakes suspension ect ect .

I my self know how you feel thinking more is best I'm going for around 600 but went out in a car running 450ish and it was a monster round town .

Exactly this

[Jonnybravo]

People get far too hung up on hp figures when they haven't even experienced a genuine 500hp engine in their life.

That 570hp Skyline I mentioned was a seriously quick car, It did everything so well and for what I've read on here about the GTX3076 being a rubbish turbo it totally worked on that car, there was still room for more power but you have to factor reliability into these cars and the guy that maps for me does not ever feel the need to run the engines too hard, especially when you consider these are 2wd so can get a bit lively !

I really do believe that unless your willing to build a half decent specced engine you are going to run into issues no matter what turbo you use, big turbos will surge and even more so on a poorly specced engine, a good head job and the right cams go a long way to a engine making the power well.

A few people on here have achieved good results using things like a GT35 which by the sounds of things is the area you want to be in, 600-700hp is achievable from those but you are still talking a lot of money, it all comes down to what your budget is as there is no cheap way of getting big hp. ( and 500+hp is big hp )

[jsws3]

Point taken, this is the sort of info I have been looking for. Basically I want something that will make me s**t myself every time I drive it.

What would be my options?

I think a well set up engine with about 500-550 will make you poo your pants .

Allso is the car set up for more power ie brakes suspension ect ect .

I my self know how you feel thinking more is best I'm going for around 600 but went out in a car running 450ish and it was a monster round town .

[V6quattro]

Point taken, this is the sort of info I have been looking for. Basically I want something that will make me s**t myself every time I drive it.

What would be my options?

That's what I wanted to. But you get almost immediately used to the power and always want more

[bigcooler]

Point taken, this is the sort of info I have been looking for. Basically I want something that will make me s**t myself every time I drive it.

What would be my options?

[Jonnybravo]

Having driven a Skyline with a 42 on the road I would certainly avoid using it unless its a dedicated drag car. I don't think we had even seen .2bar by 4000rpm, was moving by 5000rpm though but due to a 8k rev limit the power band was narrow. As a comparison we did a 2.5l Skyline ( above was a 2wd gtr motor ) with a built engine, Cosworth ported head, cams and a billet 3076, it made 570 on the dyno and would destroy the Skyline running the 42 as it was so responsive and still making plenty of power above 7500rpm making it a VERY fast road car, come to think about it the car was also full road trim R33 where as the other was fully stripped R32 which are much lighter.

GT42 will look good on a spec sheet, unfortunately the reality is that they offer poor performance on a street car and due to the massive power they can achieve they need a well specced engine and a well sorted transmission setup if you dont want to spend more time off the road then on it.

[driftin jo]

You missing the point, to build an engine around a GT42 to it's full potential (850-1000hp) is going to cost a least twice as much as building an engine to make 600hp. Not only that but the 600hp motor will be quite reliable were as the 1000 hp motor will need rebuilding ever 5 mins.

The other thing is also that the drive train will not take 1000hp in stock form either so more mega bucks on that also.

Shooting for ~600 hp you can keep stock pistons, just do the rods, keep revs down so you don't need new bearings every weekend and don't need a dry sump system (saves a fortune).

To give you an idea a ~600hp car you can drive can be done for 5-7k and a 1000hp car will cost you 25-30k, if you don't belive me speak to people with that power level.

[A80Avant]

Yes. You won't get a smile on your face with this turbo. A 1000 rpm at most power band is pointless. Furthermore a 800+ engine requires a huge amount of maintenance when compared to a 500 hp one

[bigcooler]

every one has got different opinions but lag is not on people minds when you go gt42 it's what power it can achieve and a big smile on your face when boost comes in [/QUOTE]

This pretty much right, I have no interest in racing people on the road and don't have the funds to support racing it competitively. I simply have always been fascinated by big turbo's and would love to have a car with a big turbo

[mac2226]

If your making anything less than 800hp with a GT42 you
are using the wrong turbo, you've just got loads of lag for no reason.

Yes if it was not mapped fully for a reason...every one has got different opinions but lag is not on people minds when you go gt42 it's what power it can achieve and a big smile on your face when boost comes in

[caterpillar]

you may make hybrid... use the gt40 bearing and hotside (0,94) and gt 42 or 45 cold side,and 3,5" downpipin and exaust...

[driftin jo]

I'm sure will20v is using a gt42 with a 2.2 but don't no about head work besides twin 7a custom cams engine stock pistons and uprated rods I've been told
will be fine and he had his standard maf on cold pressure side mapped by mrc best of asking him he made 600+ and maxed out his injectors 750cc so I would go 1000cc to be safe and fuel pumps I would def run two one in tank and one inline as I'm doing so on my small gt35 but built to take that and more

If your making anything less than 800hp with a GT42 you
are using the wrong turbo, you've just got loads of lag for no reason.