nemsin

iTrader: (19)

I did some more reading about the 7460. Some reputable UK shops/tuners think it holds up well at 1.6bar. But much more boost than that and high EGT and/or over spinning end up damaging the internals.

Biggiesacks

In my experience, most premature failure is because of user error. Im talking about pretty much everything consumer grade not just automotive stuff.

kaj

iTrader: (60)

Most people seem to run 25-28psi or so. That would be a problem.

Biggiesacks

Yah like me, 27.5, hell it might be more i only have a OEM 3-bar hooked up. I wouldn't run it this hard if i was doing anything serious with the car though.

as far as spool numbers go when you are looking at different gears its really not apples to apples. 4th is a much taller gear so you will be spending more time accelerating through that boost threshold range and so the turbo will be able push more boost at a lower RPM then in a lower gear, simply because you are accelerating faster in that lower gear and spending less time at any given RPM range. Then, mods aside, when you are looking at an evo 8 vs a 9 thats not a straight up comparison either, because you have mivec on the 9 and a taller 3rd gear.

kaj

iTrader: (60)

Such a bummer for those that track their cars. It has all the characteristics of a great road race turbo. Except for longevity, that is. LOL

Evo8cy

HKS gt 2 kai, has at least the same boost threshold as the stock evo 9 (80 series) turbo. In other words to use the language of the forum, it spools at least the same as the stock turbo, if there are not any issues with the actuator or gate.



The reason it can do that although it has a 3mm larger inducer on the compressor and 6mm on the inducer of turbine, is that the compressor wheel is lighter than stock, it has better aerodynamics factors that aid spool highly, and also important is the fact that it uses a 9cm2 housing versus the stock 10,5cm2, of a special design on the inner construction on the inside of the housing (dividers) to aid gasses speed and velocity. Turbine wheel is slightly heavier than stock, I do not remember how many grams of a difference they have in between them but it's the least difference they could have, as it is made of high grade 713c inconel with thinner fins and hub than say the garrett turbine wheel found in a gtx3071 i.e, it also has better aero than stock wheel.




The gt2 is not that larger than the stock turbo, and those in the know, know that a larger turbine wheel can in certain occasions spool faster even on the same exh. housing, than a smaller one, it's all down to the material, weight and aero design.








Marios

kikiturbo

this e9 with hks 7460 kai spools great and transient is much much better than stock... like from vacuum to 1.8 bar in 0.5 sec at 4000 rpm... Boost treshold is similar to stock turbo and feeling behind the steering wheel is of a much more responsive engine..

this is on SD but on Maf it spooled even better.. I can probably make it better with more fueling changes on spool up.. (it is really sensitive on fueling on spool up)
stock engine, S2 cams, stock exhaust manifold and intake manifold, custom 3 inch DP, cheap IC.. fuel is our 98 octane but in reality it is probably worse than US 93..



it does like to surge...

Evo8cy

95 ron over here is around 93-94 ron ,98 ron of most oil companies is in reality around 96-97 ron, we also got 98+ from a certain oil company which is actually 98 ron.



In Europe we use ron , where in the states they use mon, or at the gas stations, pon.


95 e.u fuel is 91 u.s pon

98 e.u fuel is 93 u.s pon



In reality 91 oct u.s fuel is actually 89-90 and 93 is like 91-92 oct. It is a misconception that in the u.s they have better quality fuel. Now if we take the pump stations, any given pump station can "modify" their fuel to have more profit out of it but making it of worse quality, that's why you can get different " types" of 91 or 93 oct fuel depending on the station. If all is legit then 89-90 for 91 and 91-92 for 93, but this is another matter for another discussion.


98+ here is a better fuel and has slightly higher oct rating than the 93 pon u.s fuel.









Marios

kaj

iTrader: (60)

I'm WAY too lazy to convert all those numbers.