Harey

As has been said in many of the posts there are a lot of different factors. If you want first hand opinions get off your butt and go read the dyno threads for 30+ pages of 'first hand opinions' at least 50% of which will have the 044 fuel pump.

The 0.63 will get you a lot more response over the 0.82 housing no question. The only downfall is the higher temps if you wish to run higher boost levels and you will most likely not feel the pull all the way to redline.

Why double? I thought E85 only used between 20-30% more fuel than 98?

Perfect summary here: http://www.allpar.com/eek/hp-vs-torque.html

Lots of factors, the lower pressure the pump is pushing against the more it can flow. Bosch and other fuel pump manufacturers have charts of this. Ways to lower fuel pressure, ensure your injectors are large enough so the fuel pressure doesnt need to be raised, run lower boost pressure etc

Love the pics, soooo many nice cars! Thanks for sharing

I think even the RACV vehicle checks are about $200. I would prefer a GTR specialist at least that way they know what to check.

I could not make anything over 250rwkw using standard intake with the Rev210 $5 mod. The top half of the dyno was basically a flat line. I would strongly recommend a metal intake pipe, I just finished mine with return ports for both the bov and pcv.

Just finished my 3" metal intake pipe with return ports for both the bov and the pcv. I guesstimated the wrong location for the pcv port and just joined it anyway even though I could have blocked it off and put a new one in. Car runs a lot smoother with everything connected.

Please show me where I said that a GT-SS is better than a Garrett -9, I have no experience with these turbos and have no interest in researching them as I dont own an RB26. This does not mean all comparative HKS and Garrett turbos are identical. I rate results much higher than marketing. If you want to feel like you are at the forefront of turbo technology by guesstimating the results of the 3071 fine but I will wait until I see the results to judge them.

Incorrect, for a start the exhaust housing is a different size. The hks is 0.68 and garrett offers 0.63 and 0.82. If you search on this forum you will also find other differences such as back cut exhaust wheels etc. I am not an expert in this area but I do know that they are NOT identical. I also went through the dyno thread and analysed many different setups using the 3071 and HKS 2835 Pro S. Time and time again the HKS 2835 Pro S has equal or better top end with a much stronger mid range.

I am sorry to deeply offend you by supporting the Hypergear product. And by supporting the Hypergear product that must mean I hate very other turbo right... I am simply saying the many results on this forum indicate the HKS 2835 Pro S outperforms the GT3071. The more turbo options the skyline owner has the better imo. You have the cheaper Hypergear turbos that do their job and have hiflow options for factory appearance, you have the garrett turbos in the middle of the price range with the quality brand name and performance and you have the more expensive HKS turbos which in this case the 2835 Pro S does outperform the above in overall sub 300rwkw performance on a stock RB25. It is the owners choice to juggle all the info and choose the best turbo for their application.

You can use all the tech mumbo jumbo you want, I am simply using all the evidence we have collected on this forum. There is only one GT3071 I know of that matches the peak power of the HKS2835. Whereas there is a great number of HKS2835 turbos that consistently produce the numbers. Compare the dynos, the HKS2835 has considerably more mid range than the 3071 and then matches the best performing 3071s in the top end.

If you read this thread, the big power GTR boys will show you time and time again that the HKS variants make more power than their garrett variants. http://www.skylinesaustralia.com/forums/topic/251820-got-over-400kw-atw/page__st__620__p__5578829__hl__400kw__fromsearch__1#entry5578829 These guys have the same setup and are willing to try different turbos to directly compare them. How many of us are willing to do that.

Yes I do remember the results of 'Usmair' and they were very impressive, still not quite the response and mid range of a 2835 but very good nonetheless. However, for every Usmair result I have seen, I have also seen 3-4 poor results, where they make less peak power than a 2835 as well as less mid range and response. Yes I agree not everyone can afford/justfiy the expense of a 2835 (me included) but I think its hard to find a superior overall turbo for a sub 300rwkw stock rb25.

Trust me it hurts me too to be remotely on the same side as you. I thought you were the response fan boy? Great the 3071 with 0.82 housing can make the same peak figures as a GT2835 with a 0.68 exhaust housing. The 0.68 exhaust housing outperforms the 0.82 in the response and mid range department, and if they have the same peak then I know which one I would prefer.

Hold up mate, show me one dyno with a GTX3071 being more impressive than a HKS2835? Oh wait thats right we havent seen what they can do yet. Its all good to be positive but I think its WAY to early to make outlandish statements like that. All we know so far is the HKS GT2835 beats a GT3071 in every way.

Yeah agree but it looses the whole factory engine bay appearance thing!

Not so sure about same response. The HKS 2835 runs a 0.68 exhaust housing, the the GTX will only come in 0.63 and 0.82 of which the 0.63 is too small for most people. Plus the GTX3071 is expected to have slightly less response then the GT3071 due to the new design. Therefore I would expect the HKS 2835 to have more response then the GTX3071 but I would expect the GTX3071 to have more top end.

If you read this thread you will find there is quite a large difference in when people run out of injector duty cycle due to a myriad of different factors. Remember a base fuel pressure is only a base. I think the standard base fuel pressure is 3 bar ~ 43psi, although it will raise 1psi for every 1psi of boost pressure. So if you are running 20psi of boost pressure then you are running 63psi of fuel pressure.

Surely the true major reason for this crash is driver inexperience. If he was doing 100km/h in an 80 zone in a camry would it still be hoon crash??

change the turbo housing from t2 to t3 to keep Paul happy Your talking about some serious mods here, I would expect min 12k to have anything actually running and the potential for a lot more $$. I agree with GTScott, put a 0.82 garrett housing on it with the appropriate dump pipe (GCG can sell you this) and that will get you a nice 300rwkw for very little cost.

RB25DETS2 runs a HKS 3037 Pro S on 23psi on E85 on a stock RB25 making 348-356rwkw depending on dyno. As we know the 3037 is a 3076 with a few tricks so is directly applicable. NYTSKY has also had the 3076 up to 350rwkw maybe even more I cant remember. I think a GTX35R really demands an aftermarket manifold etc.

My vote is for keeping the 3076, go E85 and run 23-25psi. Should make 340-350rwkw, improve your current awesome reponse (E85) and have a spastic mid range and top end!

Wow thats big news, I cant wait for the results either! So a GT35 will fit onto the standard exhaust manifold? I thought the standard exhaust manifold started to become a reasonable restriction over 300rwkw?