Hi Guys,

I got my self a Evo VII, with a upgraded turbo(bolt on type), So just curoious as to how it prefroms compared to a stock turbo.



Considering the car being fully stock the main questions are:

a) What RPM dose the stock turbo start to spool / gain positive pressure? (pls correct me if this is a stupid question)

b) When dose the stock turbo reach max Boost RPM wise?

C) What is the stock boost pressure?

 

A few more details may be helpful to us. What model of Evo VII did you buy? Sometimes different models within the same generation may come equipped with different turbo variants. Also, what turbo is on there now? You say that it is a stock looking upgrade turbo. Well, what turbo is it exactly?

 

Well, I noticed upon rereading your 1st post that you drive an Evo VII RS. So, this answers my first question and tells us exactly what turbo came on your car from the factory. This is helpful information indeed.

 

The Evo VII RS came from the factory equipped with a TD05HRA-16G6-9.8T turbo. This turbo is a relatively fast spooling 16G unit configured with a low mass Titanium-Aluminide turbine wheel. Depending on WGA preload and other factors, 20 PSI is typically seen by 2700-2900 RPM. Peak boost from the factory was set somewhere between 14-19 PSI depending on the octane rating of the pump gasoline available in the particular market area or country of delivery.

 

Wow, four posts in a row. That's post whoring isn't it? Maybe now I can post an ad in the for sale section.

 

Wow indeed,

Thank for the great input~!

The current mods are listed per below, willing to change to get my ideal target:

Around 400~ whp,
Under 400 crank tq (for save stock engine internals operations).
Daily driven.

How does this compare with the stock VII RS turbo?

From my research HK has 98 RON fuel, which means 93 Oct?

They have V-power as well , but not sure if it is the suggest 100 RON?

HK is a street car only place, with some nice mountain roads, so no need to a power monster

 

I suggest that you consider upgrading your fuel delivery system(pump and injectors) before doing any further power upgrades.

 

Is the 100 R.O.N. Shell VPower gasoline readily available to you? You can get it everywhere?

 

The fuel system will be the next upgrade, along with a proper 3" exhaust system, Cusco LSD and maybe cams.

Finally an ECU tune or a piggy back ECU unit e.g HKS Fcon v-Pro.
The clutch/ breaks may need to be upgraded once the upgrades are done.


The V-power is available in all the shell stations here, but not sure if it is really 100 RON.


Hope fully I can reach my target whilst being reliable enough as my DD.

 

I think that you should maximize your present setup before doing anymore piecemeal upgrades. Quite possibly your desired power level may be attainable with your current mod list.

First off, if I were you, I would install some larger injectors and do a fuel pump upgrade. Next, I suggest that you contact Chris at Mellon Racing. Chris will scale the larger injectors and tune your car via Email for Shell VPower gasoline. So, you might want to get in touch with Chris and he will suggest the properly sized injectors for your setup. He has experience in unlocking and tuning all generations of Evolutions from I to X.

I think that your power goals are probably achievable with your present power mods... given a killer tune. Incidentally, Shell VMax 100 R.O.N. gasoline is equivalent to 94 maybe 95 octane U.S. "Road" pump gasoline(R+M/2).

 

If you are itching to get the most out of your Evo VII then your next power upgrade should be a set of camshafts. In the U.S. the Kelfords, or GSC S1, or S2 cams, are widely considered to be the best power producers while maintaining good street manners. Eventually, you may want to ditch the Tomei turbo in exchange for the much better HKS 7460R.

 

I have read the GT II is very good, but since I got the Tomei with the car, I will try it out first.

Hence the topic, I want see what I can expect from this turbo compared with the stock one.

As part of the deal, the car is getting the engine rebuilt, with OEM parts where necessary, plus the mods listed below, so it will be some time before I get a new turbo set-up.

If the Tomei hits full psi spool 200-300 RPM later than 2700-2900 RPM, then I'm happy for now.

 

I have just gotten through reading a long thread about your turbo(TOMEI). Apparently, the compressor and turbine wheels are very close in size to those of a stock VIII, or IX 16G turbo. Rate of spool is about equivalent to that of a stock IX turbo(20 PSI @ 3200 RPM).

Some tuners have been able to squeeze 20 and up to 50 WHP more from the Tomei ARMS than a stock IX turbo. It responds well to breathing mods. It is very octane sensitive and likes high boost. So, I would get it tuned for the highest octane pump gas that you can get. This turbo really starts to shine at over 24 PSI of boost.

It is also very cam sensitive. It responds well to camshaft upgrades. To the extent where it is a dog with the stock cams. So, I would install a set of GSC S2's, or Kelford 272's. Go to a 3" downpipe, and better intercooler piping as well.

 

Editted

 

Will adding cams and bigger exhaust increase the torque to a level that is unreliable for the stock internals?