I am in the Philippines, and after a long wait, one of our local brands Petron is rolling out its 100 octane pump gas that will soon be available in all stations across the nation. The highest octane rating used to be 96 octane.

I ordering an HKS GTII 7460 turbokit with an HKS R-Type intercooler. I am wondering if anyone is using the same turbokit and to how many PSI would be the safest but highest boost this can take on 100 octane pump gas.

Specs of my Evo 5 on the works are as follows:

Jun 2.2 stroker
Tomei 280 cams
Cosworth race head
280lph Bosch fuel pump
800cc injectors
Motec M48
Motec CDI
HKS spark plugs
Trust exhaust system
...and other stuff.

I am not after huge power so much. I want a balance between power, spool, and response, that is why I also opted for a stroker kit. That being said, can this turbo with those mods above safely make 450whp on 100 octane pump fuel?

 

Look in the dyno section....My guess is you can easily run 28 psi peak tapering to ~25-27 psi at redline. Personally with your built 2.2 L I would have chosen a bigger / better turbo (IMHO). That said, your setup should be very very responsive. Enjoy

 

ballin in pinas brah!!!!....nice!

 

I think it will be close. You will possibly be well out of the efficiency range of the turbo and have very high back pressure in the manifold, in order to make that kind of power on the kit. I think if your went with a larger turbo built for about 20% over your target horsepower, with a well-designed tubular manifold, you could make your target power at less boost. In contrast your set-up will result in very quick boost response and acceleration. Either way, hopefully it's a blast to drive.

 

450whp should be achievable, but like other people have said it will be a hard working engine with that small turbo.

Have you looked at the new Borg Warner turbo's?
Maybe the 7670?

http://www.full-race.com/store/turbo...670-turbo.html

T4 twin scroll dual external wastegate... now this would be fun! Should be better response than a 3076, so full boost at 3500-4000ish with wicked response?

 

My only worry about larger turbos is the lag at low RPM ranges. Response matters a lot to me and my goal is a balance of great power and response across the band. In fact, I was considering a Power Enterprise RX6 TCW77 turbokit. like the one seen on the Cyber Evo and I just loved the way the car ran at Tsukuba. My worry was just the response.

Basically, my goal is to make my car really fun to drive, more like those that Mines builds. Very responsive at the right amount of horsepower. Fun factor is so much present. The Evo 5 is a very light car, and that is what makes it so fun to drive, so fun factor is one thing I do not want to sacrifice.

I am still open to other turbokits though, as I have not purchased yet the GTII. Its on top of my list but I just need more reviews on it. Been searching youtube but I have not gotten any substantial answers yet.

You guys think I am better of with the PE RX6 turbokit or maybe an HKS GT3037S? How about the HKS GT2835? That Borg Warner looks interesting! Who uses those turbokits too? Reading other posts though on the GTII, it seems like people are positive about it.

 

That gasoline is 100 octane R.O.N.(Research Octane Number), right? If so, then this is equivalent to 95 octane using the U.S. AKI(Anti Knock Index)system.


R.O.N. x 0.95=AKI

 

Yes, thats 100 RON

 

The 7460 would appear to be the best choice given the options that you have listed and your intended purpose. The IHI RX-6 and the HKS 3037 are slow spoolers and outdated. The 2835 will not put out as much power as the 7460.

 

Dont let these posters in here swade you to larger turbo. The 2.2 mated to HKS turbo is going to be unreal fun setup. I am using the turbo on high compression 2.3. It will die after 7000rpm but so what. trans shifts fantastic at lower rpm, easier on engine, no heavy valve springs needed. better gas mileage, and the list goes on. I expect 300tq at 2800rpm, 550tq at 4000rpm and 450whp at redline 7000rpm. No question in my mind it will be stupid fun. what happens between 2500-4000 is extremely important for a street car. if the car is low on torque in that range it will not be a fun car to drive daily.

You dont need high rpm for fast car. The lucus english drag car has run low 10s in the quarter and shifts at 6200rpm with the auto trans. car has 2.3 with fp white. I am certain my yellow car with 2.3 35r can run 10 flat 1/4 with rev limit set at 7000rpm.

famous turbo quote
"torque=fun"
the faster you can make torque the more fun the car will be.

 

^^^

So you are using the GTII on your 2.3 right? I saw the charts by Iveytune and it seems the spool is fantastic. How is it on yours and how is the response?

 

expect anywhere from 30-50whp additional verse the evo 9 turbo when running the HKS GT2 turbo.

100 ron is what? 94octane usa? you might reach your goal its hard to say.

 

95 Octane USA. Iveytune charts are showing 450whp, so im not sure what fuel was used. Im running also a Motec ECU

 

Basically, here is my thing.

The Evo 5 RS is a very light car and it has short gear ratios. It has no sound deadening, no power amenities, etc. It is perfect for road courses, mountain touge, and winding roads. In its stock form, the car is very aggressive, and very fast. Response is excellent. It is such a fun car to drive, no offense to the Evo 8 and 9 owners here but once you get your hands on a CP9A, you would not want to return back to your newer gen Evos.

I basically want to keep my Evo 5's fun factor at the same level, but this time, with more power. I want to make it go in tracks with Porsches, and I want to smoke em exotics during touge Philippine version runs.

In its stock form too, the Evo 5 can only go a maximum of 220kph, the most is 230kph, due to its short gearing, so when I get a new turbokit, I expect top speed to still be the same.

Hence, I really want superb response with added power and torque across the whole band. When I watch Japan touge vids involving Evos, I notice that they only use small turbos, with a max power of just 450.

I was thinking that the HKS GTII would be the right answer to my requirement, complimented with a Jun 2.2 stroker, Tomei cams, and a Motec. I might even get TB porting.

So with all these said, do you think that the HKS GTII is the right turbo? I was thinking the FP Red would be laggy with a loss of torque at low revs.

 

i wouldn't go with the hks intercooler. i have found a few threads on here where the intercooler ballooned because of boost. i would suggest going for a garrett core like the ets or buschur. depending on the tuner & parts you could probably do 28-30 psi.