your bottom end already couldn't hold the power that the to4z is capable of producing... so a gT42 will be laggier.. and you'll be even further away from the potential of the turbo being efficient. I recon with the size of the TO4Z it would be much more efficient at the boost levels your running and make more power than the GT42 at the equivalent boost level. I had the same problem when I went from GT35 TO GT42 - I personally wouldnt do it again.

What he said^^^ You're t04z should sh1t in 600hp with the right rear on it, a gt42 is generally a 1000hp turbo. I can't for the life of me understand why everyone in the scene makes the jump from a 35/40 to 42... Keep the t04z and max it out before u upgrade.

Quote: Originally Posted by Dirtyone [View Post] The limiter is set at 6800 and seems to be ok, the 42 will be on and ready to be tuned in the next 2 weeks so i'll keep you posted on how it all goes, hoping for somewhere around 550hpatw without the gas, and if its still alive i'll do some runs with the bottle on. How much did you pay for the 42?

to get the full power advantage from the t04z i would need to port the head and have bigger valves, then a good exhaust manifold then an even better plenum, then how much more boost would i need to run and staying on pump fuel, the cost is cheaper to put the 42 and see how it goes , if it doest work ill put the t04z back on

is the proboost T04Z a reliable product, or a low grade chinese product?

Quote: Originally Posted by Dirtyone [View Post] to get the full power advantage from the t04z i would need to port the head and have bigger valves, then a good exhaust manifold then an even better plenum, then how much more boost would i need to run and staying on pump fuel, the cost is cheaper to put the 42 and see how it goes , if it doest work ill put the t04z back on Why would placing a GT42 on your setup, which is a bigger turbo.. make all of this less of a restriction? It's going to amplify your current restrictions. A ported head, bigger valves and such aren't really your restriction with a T04Z, as a decent cam setup, low comp and plenty of fuel providing you have a decent intercooler should make 500rwhp no probs at all. Your problem imo will come from your bottom end not handling over 420ish rwkw. Yes you would make the power easier with non pump fuel, and a ported head.

In regards to chinese turbos.. you just need to find the right manufacturer and specify your own quality tolerances. Proboost has it sorted, hence why his turbos are lasting. Garrett are made in China now etc etc

You should take a look at where or who you are getting your info from. 18psi isn't even in a t04z's effeciency range. These turbo's are built for 25-30+psi. Everything you mentioned will make the overall setup more efficient but has nothing to do with maxing out the turbo you have on there now. Wind a bit more boost into her and if it can't take anymore id be looking into the rest of the setup.

Quote: Originally Posted by FORZA [View Post] You should take a look at where or who you are getting your info from. 18psi isn't even in a t04z's effeciency range. These turbo's are built for 25-30+psi. Everything you mentioned will make the overall setup more efficient but has nothing to do with maxing out the turbo you have on there now. Wind a bit more boost into her and if it can't take anymore id be looking into the rest of the setup. My set up is on 25psi not 18psi, Lo ET has the gt45 on 18psi. My current tune is on 24-25psi with 470hp through the auto that would be somewhere in the high 500hp at the flywheel, nothing is maxed yet the more boost or timing we put in on the dyno the more power it makes, i just dont want to keep putting boost in i would rather put the bigger turbo on and get this power on lower boost then go up from there.

sounds good keep us all informed on how far you can push it,when are you getting it set up and retuned ?

Quote: Originally Posted by boostn vl [View Post] sounds good keep us all informed on how far you can push it,when are you getting it set up and retuned ? hoping to go back on the rollers in around 2 weeks or so ---------- Post added 28-05-11 at 12:21 ---------- Quote: Originally Posted by Morgz [View Post] Why would placing a GT42 on your setup, which is a bigger turbo.. make all of this less of a restriction? It's going to amplify your current restrictions. A ported head, bigger valves and such aren't really your restriction with a T04Z, as a decent cam setup, low comp and plenty of fuel providing you have a decent intercooler should make 500rwhp no probs at all. Your problem imo will come from your bottom end not handling over 420ish rwkw. Yes you would make the power easier with non pump fuel, and a ported head. the cam i'm running is a 966 tighe cam, would i be better of putting the next size up in i think its the 996 , is anyone using a 996 ?

Quote: Originally Posted by INFLYTmelb [View Post] is the proboost T04Z a reliable product, or a low grade chinese product? i havnt yet heard a bad thing about the pro boost products! i know ill be buying one when the time comes for me to get a turbo

Where do you get these proboost gt42's from, is he a member on the forums? are they a roller or plain bush?

i would definatly go the proboost 45,i would of wound my boost up more but the gear box couldn't take it.what specs are on ur cam? my cam is a wade cam its about 440'' lift and im reving mine to 7500 rpm stanard motor no probs at all. i will get a video of the dyno up soon

and here i am thinking that i'll blow my N/A bottom end with a GKtech FMIC, and all the stock turbo gear... you guys... made my day...

Quote: Originally Posted by Duke57TT [View Post] In regards to chinese turbos.. you just need to find the right manufacturer and specify your own quality tolerances. Proboost has it sorted, hence why his turbos are lasting. Garrett are made in China now etc etc thats a fair call - i've been waiting for a well known shop to supply me with a turbo, of a specific requirement, but they're taking forever, might have to contact proboost.

Although these turbo's have big names like 'GT42' and 'GT45' they're much smaller than the Garrett equivalent.

then probably best to ask about a HP requirement, rather than a product number i'd say?

Quote: Originally Posted by PROGMH [View Post] Although these turbo's have big names like 'GT42' and 'GT45' they're much smaller than the Garrett equivalent. the old style gt45 is smaller then the garrett version, but the new gt42 with the gold bullet nut is an identicl copy from the garrett version so if you have a spacific exhaust housing size you want from a genuine gt42 it will fit the proboost 42

Grant from proboost is a member on here, if you have any questions message him through his website http://www.proboost.com.au/. From what i have found he is very switched on and will say it the way it is if his products will or wont be suitable for your application. I run a turbo he did for me, full 18psi boost by 3400. very very responsive. once i get auto box sorted out will get a bit better indication on power figures and will be sending it back to him for a bigger front wheel!