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fmic + stock turbo

rob77

By rob77,
in Western Australia

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predator Grand Master

predator

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This is a good thread so i'm jumping on (btw: some good state posts should be moved to the aussie wide areas!).

My intercooler fitted to mine is a HKS 600x302x65 with 3" pipes and at the moment i'm just running the standard turbo with about 12psi. I will prolly crank this up on next dyno tune to 13-14psi because i should be able to run that fairly safetly with this sized big cooler because of the increased flow correct? I have a Profec B so i'm also hoping boost spike will be very low. Although i hear after 12psi the standard turbo looses efficiency and each extra psi may only give a slight power difference. So really I'm maxing out at about 190rwkw (shall be dynoed again next week)

Its hard to get some concrete figures on this (did a lot of searching on the web!), but a cooler of the size of mine is rated at about 400-500hp ? Now i'm just wondering what i should I should do next. Do I:

a) keep current cooler based on the fact that i will soonish (this year) install a bigger turbo. Will it be match for say 250rwkw ? too big still, too small?

B) sell the HKS (because it is worth a fair bit compared to many) and go for an i/c more suited to my needs, and put the difference to a turbo upgrade?

In the future I am planning on probably running a GT2530. My goal is around 230-240rwkw without having to go too stupid replacing cams, rods, pistons, etc right away.

Really my goal is a good streeter (it is a daily driver afterall) with emphasis on quick response from 0-100km/hr without too much hope of throwing pistons, cracking rings, etc.

Hmmm..maybe i'm asking all too much over a forum but some feedback could be good on what i should do would be great..

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rob77 Veteran

rob77

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I'd keep the current cooler, but to get 250 rear wheel kilowatts I think you'll need the bigger turbo, plus aftermarket ecu, uprated fuel system (fuel pump, bigger injectors) and you'd be close. You might have to get a thicker head gasket to drop compression to run higher boost with no detonation which will make bottom end torque suffer. The trust 600x244x76 cooler will support 450-500hp, so your HKS shouldnt have any problems with 250kw @ wheels. Go for the HKS GT2540 over the GT2530.

predator Grand Master

predator

Posted
Posted

GT2530 is meant to have quicker low down response and power - unless you are running massive boost (20psi+) the GT2530 is meant to be a better option from what I would want it for?? There's a big thread in the performance forums of GT2530 vs GT2540 - each has their own advantages and disadvantages.

Yup, PowerFC would be on the list before the turbo, and i already have a Bosch fuel pump ready to go. Injectors not too sure but they would be a more a wait thing to see thing as they're expensive. So yeah, maybe i am better off keeping the cooler, as at the moment i'm just a bit bothered by the current lag (its not massive, but noticeable).

rev210 Grand Master

rev210

Posted
Posted

Predator666,

you have raised an interesting issue here...

The HKS 2530 is rated to a little over 300HP, the 2535 is 340HP , the 2540 is 350HP, the 2540R is 380HP.

Most would not argue that the 2530 is a bigger turbo than stock and is considered an 'upgrade'. So when people go around claiming 200rwkw, I assume this to equate to over 300HP @ motor (in fact 180rwkw given the right sort of losses is about 300HP). IF this is the case why buy a HKS 2530?

Well for starters the 2530 IS a bigger flowing turbo than stock and does make a 'REAL' 300 or so flywheel horsepower.

If that is the turbo you are aiming for then a 500HP intercooler is a dumb idea. ie: 500HP intercooler for a 500HP turbo and a 500HP ported head and camshaft selection.

Either: 1) get the right sized intercooler for the upgrade to a HKS 2530

OR

2) get a HKS 2835 or GT3037 and so on to match up with the intercooler.

Anything else is half-arsed but, none the less will go better than stock, just no-where near as good as a proper match. And I mean NO WHERE NEAR AS GOOD not just a little better.

red17 Experienced

red17

Posted
Posted

From what ive heard of the GT2540, it appears to have an imbalance between exhaust housing and turbine size. It seems the exhaust housing is smaller than you would expect for a turbine of its size. I presume this could create greater exhaust temps and a slightly lower efficency overall?

From all reports the GT2530 is a much more balanced unit, while overall being smaller. I suppose it depends on the power your looking for.

Id be happy with a 30. Hell, id be over the moon, anyone got one to donate, kidding :D

As for your injector claims Rob, ive been told from reliable sources the stock RB20DET injectors are good for 300 ish hp, i doubt the RB25DET would be any different.

Red17

rev210 Grand Master

rev210

Posted
Posted

300HP @ the motor, the flow of the turbo is always rated in engine power.

Hence why I don't have alot of time for peoples dyno figure claims when they back-figure them to relate to stupid engine power claims. Fortunately most of the same people can't produce good 1/4 times either.

GTS-t VSPEC Grand Master

GTS-t VSPEC

Posted
Posted

rob77,

The stock injectors can easily handle 300rwhp if used in conjuction with a fuel pressure reg. If upping the turbo size significantly then I would also do injectors, not point running them close to full duty cycle.

See'ya:burnout:

rev210 Grand Master

rev210

Posted
Posted

The turbo is rated to 'flow' a certain amount of HP worth of air at a standard temperature and pressure. If the temp is lower etc the power can be a bit higher and visa versa. Other variables can allow a greater power to be developed from the same volume of air too.

Coming back to the HKS 2835, they are rated upto 480PS odd depending on the turbo specs. I'd say that it was a big spec 480PS item. What does the article say?

rob77 Veteran

rob77

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Sorry I read the article wrong... here's the quote; "probably the most popular option is the HKS 2835 Pro bolt on kit, rated at 370ps and capable of a bit more. For more headroom again, a unique option is the GT2837R from Power House Amuse.... The GT2837R is based on a Garret GT28 core, with a simularly sized exhaust housing to the HKS 2835 Pro, but with a larger compressor, which is simular to the infamous HKS 3037...." With std adaptor and manifold pipes the Chaser made 400ps on the dynopak dyno @ 1bar, 435ps @ 1.2bar and 455ps @ 1.3bar. Sounds like a fairly beasty turbo... and its a garret not a HKS ;)

rob77 Veteran

rob77

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Steve, I'm not going to get into the arguement about garret and hks. Yes garret make turbo's for hks, but some of the garret turbo's will not give the same results as a hks unit (such as the hks 2540's) and simularly most garret parts will not fit a hks unit. Personally I'd go a hks unit over the garret, but its a question of costs.

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