New Vishnu Engine Block and Cylinder Head

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Jun 11, 2003 | 02:29 AM

wrxstipwr

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From: Bullsh*t 3 Ring Circus

Car Info: Soon to be '03 WRX

New COBB Engine Block and Cylinder Head not Vishnu!!!!!

I was on the Cobb tuning site the other day and saw that they had blocks and cylinder heads on their site for purchase. I was looking at the 2.5L block and the upgraded cylinder head for my wrx but wanted to know what other under the hood items need to be replaced i.e. fuel pump, injectors, trany. Im not one that knows a whole lot about cars but someone told me that this would be a good mod for someone that has the money to throw in it. That the extra .5L would give me a good extra ponies under the hood. So my question to everyone is "Is this mod worth it if I had the money and what things would I have to chage to make this mod?" Im just wondering because I think my friend is an idiot but I dont know about this one. Help me out please!!!

Thanks in advance.

Last edited by wrxstipwr; Jun 16, 2003 at 02:24 AM.

Jun 13, 2003 | 05:08 PM

NSR500

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I don't see what you are talking about on Shiv's site. Post up the URL.

Jun 16, 2003 | 02:23 AM

wrxstipwr

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Posts: 43

From: Bullsh*t 3 Ring Circus

Car Info: Soon to be '03 WRX

Im sorry.

http://cobbtuning.com/wrx/engine.html

It wasn't Vishnu it was COBB Tuning that had the engine blocks. I must have had Vishnu on the brain when I posted the topic. I hope this clears any misconception. Thanks and sorry for that.

Jun 17, 2003 | 09:21 PM

Wingless Wonder

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Car Info: 02 Impreza WRX sedan

Originally posted by wrxstipwr
That the extra .5L would give me a good extra ponies under the hood. So my question to everyone is "Is this mod worth it if I had the money and what things would I have to chage to make this mod?"
Other tuners have done similar swaps/mods using larger-than-stock displacement. Check out I-Speed's results with their stroker kit. If you want specific details about Cobb's engine kit, you should perhaps contact them directly.

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Jun 24, 2003 | 06:22 PM

Concillian

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For the most part just a stroker kit or just a re-worked block or just a re-worked head is not ideal.

Look at some dyno charts, actually look at LOTS of dyno charts, what you'll see is that the USDM engine, even with a big turbo consistently hits peak HP at between 6000 and 6500 RPM.

Stroked engines end up with peak HP slightly lower.

JDM engines, with different heads and cams, make peak HP at about 500-1000 RPM higher than the stock engine, indicating they flow a bit better.

All of these assume a turbo that can flow plenty for the peak power levels.

In my mind, if you're stroking for more torque, that's fine, but if you're stroking for more power, you need to think about heads and cams. The stock setup has proven plenty capable at power levels over 300 WHP. If you're thinking about these kinds of changes I'd think you're goals are above this and/or your goals are driven by getting more low-end torque.