Harey

Do you mean an adjustable fuel pressure reg? Cause the factory fuel pressure reg is rising rate. As said previously boost does not help the amount of fuel getting through the injectors. They must be high duty cycle if only the standard reg. 1cc for 1hp must be at 100% duty cycle.

Standard fuel reg I assume. See that sounds more like it. Sure theres more to be gained from 12:1 afrs but surely not 60rwhp. So people must be running them at over 85% duty cycle to make 300rwkw?

Exactly right. Its only ever effectively supplying the base fuel pressure. 1psi of air pressure cancels out 1psi of fuel pressure, hence the factory 1:1 rising rate fuel regulator for forced induction cars. Where did you get 550cc ~ 550hp?

Hi, I have searched and read many threads on here about injector sizing. Many times people mention that 550cc injectors will supply enough fuel for 300rwkw. How is this possible on the standard fuel pressure of 3 bar (43.5psi)? I have entered the following figures into many different fuel injector size calculators on the net and they all say I will only make 250rwkw on 3 bar of fuel pressure. I am using the following data: BSFC: 0.60 (for turbocharged cars) No of Injectors: 6 Max Duty Cycle: 0.8 Fuel Pressure: 43.5 On the following site it only provides fuel for ~420hp at the engine, which is ~250rwkw. Am I missing something? Are people upping the fuel pressure or running the duty cycle above 80? Any help much appreciated!

*Cough* *Cough* Restrictive Exhaust! Driving around without an exhaust is no louder than most harleys. Do you have a mate that lives on a remote road? Go out there, drop the exhaust and go for a quick drive. As said previously just give it a quick squirt and see if it builds boost faster but dont overdo it.

I think an extra $600 is bit light on. If you have a look at this thread, even if you do all the work yourself including modifying the dump pipe your still looking at $7-800. http://www.skylinesaustralia.com/forums/Ga...25-t255288.html The 3k kit from GCG includes: -GT3076R with Garrett T3 5 Bolt turbine housing -Spacer Plate -Studs, Nuts and all Gaskets -Oil and Water line kit -Silicon elbow for intercooler plumbing -Stainless dump pipe Its not too bad really, especially if your after the least fuss possible.

0.73 rear doesnt sound that small. Guys are making good power with the 0.63 housing. Yes the optimal is a 0.82 housing, but 0.73 isnt far off that! Standard R34 OP6 housing is what 0.5 something. Guys are making 250rwkw with a smaller trim hiflow wheel.

GCG do the kit for $3k, so its a bit more than $2k.

Edited: Woops misread post

I have driven around the block before without an exhaust just make sure its a short block hahaha. yes you get a few looks

Yeah thats my preferred option too, its just its $2k compared to $3k for the real one (complete kit) plus you need a new dump pipe etc.

If heat is the cause of turbo failure, what will using E85 as a fuel enable the stock turbos to boost to? E85 burns hundreds of degrees cooler which means surely the turbo would be running at a lower temperature, ie capable of higher boost levels. Anyone tried this?

Hi All, Just came across this turbo, it is a GT3076R turbo but made to bolt up directly to the skyline manifold and dump pipe. Only modification is to the water lines. They also do it for GT28RS, GT2871 or GT3071. Bottom of Page 2: http://horsepowerinabox.com/HPIAB2/category12_2.htm Seems very interesting although I spoke to Michael from GCG and his response was: "We used to do these bolt-on turbochargers, however, we ran into heavy boost spike issues, as the factory 6 bolt Nissan housing is just too restrictive and small on the back of a GT3076R. This was the case, whether it be machining the original housing, or using atermarket cast housings" Just wondering if anyone has used one or if anyone has any more information around them?

They actually do now: NEW!! RB Nissan Special Garrett GT3076R ball bearing turbo Bottom of page 2: http://horsepowerinabox.com/HPIAB2/category12_2.htm Although, GCG do not like it and say that the standard skyline flange is too restrictive for the GT3076R and causes boost spiking etc.

come on man, hurry up and do it! keen to see if thats the issue. Remember reading about a 34 gtr on here that was having the same issue lots of lag and it did turn out to be a restrictive exhaust.

Just ordered an organic 34 GTT clutch with 3300lb of clamping force. Should be fine for 250rwkw (hi flow turbo). Quoted $935 exchange delivered plus $275 deposit until I return my one. Standard clamping force is 1600-1700lb and they have roughly 140-150rwkw stock, so double the clamping force is roughly double the power. So should handle ~280rwkw. Cant wait to see how it goes! Sick of the revs flaring under a hard 1-2 gear change

Just a reference point, this guys making 300rwkw with a GT35 with 0.63 rear on 20psi but has a lot of mods (intake plenum, aftermarket manifold etc etc). http://www.skylinesaustralia.com/forums/Fs...tt-t294613.html

Thanks R31Nismoid! It was driving me nuts!! Cheers

Very interested in the injectors, but I cant send you a pm as its disabled for you. Let me know Jeff 0400648813

Hi all, I have just upgraded my intercooler and have no need for my factory R34 smic (side mount intercooler). It is in excellent condition! Comes with air duct and brackets etc (see photos). This is a great upgrade for an R32 or R33 as it is taller and thicker. $150 pickup from Doncaster, Melbourne. Happy to post but that will be additional cost. Jeff 0400648813

Found out it only has a cat back exhaust and a stock dump pipe, hence the lowish power for the mods. Was on about 8.5psi. Update! Trust Turnflow Intercooler Boost upped to 10psi via turbotech boost tee Nistune tuned by Sam (Dr Drift) 190rwkw @ 10psi

One thing is for sure the bigger the dump pipe and exhaust on a turbo car the better. Less restriction means turbo spools up quicker increasing response, decreasing lag and also increases top end. Its better in every way. I have heard of people putting larger exhausts on an N/A car and saying they lost a bit of down low torque but gained mid range and top end. Although I am no expert on that so will leave it there. As said by paulr33, the split dump will not help with response but will help top end flow. How much I do not know. Surely someone has done a back to back dyno.

high pressure actuator FTW!

My opinion is you have to be clear with what you want out of a tuner. If you go to a tuner stating you only want to spend $750 and you want 300awkw. Technically he has done what you asked. If the car has been 100% for the past year and you are just upping the boost 5psi then sure just ask for a tune. But if you have just installed aftermarket turbos, dump pipe etc etc then I would personally say can you please inspect my setup and if everything is fine, tune it. Its such a fine line between leaving them help out and leaving them do whatever they want. Sounds like they definitely came to the table in the end though.

So the exhaust was too restrictive. What did you change?