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Old 05-16-2000, 02:36 PM   #1
Scooby Specialist
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2012 dcrawford died
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Question Along the lines of the N/A tuning....

I mentioned in a reply to the cams and N/A tuning that I have a 72 MG with Weber carbs. Along with replacing the SU carbs, I also put in a new cam, larger valves, and had the head ported and polished...all normal N/A tuning stuff. Has anyone thought about doing that for the RS?

I don't hear a lot about internal mods. Has anyone polished the intake? Anyone put in larger valves? Modifications along those lines would probably require a change to the ECU, but with those fancy computer controllers modifications like that should be useful.

Any thoughts on the matter?

D. Neil Crawford
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Old 05-16-2000, 03:00 PM   #2
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2014 GLK/allroad
Datsun 71 240Z & 68 2000


Mr crawford, I have been very interested just that.. we have 2.5 thumping liters to work with.. I am certian that we can get serious power out of the engine without forced induction... there has been lots of interest in this recently, which makes me happy because I have been harping about it for months..... lets see what happens in the near future..

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Old 05-16-2000, 04:19 PM   #3
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2000 2.5RS Sedan
72 Datsun 240Z


One of the main reasons I think nobody has really got around to modifying engine internals for performance is because our cars are so new. Most of us are still on the factory warranty and don't want to put that at risk. What I would wait for is a junkyard engine out of a Legacy since they're much more common than a 2.5RS. All of the tricks you mentioned and more could be implemented into the Subaru. The only limitations I see are emissions and stock ECU compatibility.

My goal with my RS is to get maximum reliability and performance out of the 2.5L without forced induction. I figure with a proper exhaust system, modified intake and a set of reground 'mild' cams should make 200+hp quite easily, cheaply and reliably. I'm not into aftermarket ECU's or more major mods at this point due to the added cost and complexity.

'00 2.5RS Sedan
'72 Datsun 240Z
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Old 05-16-2000, 04:28 PM   #4
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2000 Legacy GT Ltd


If you invest a set of cams and other various of N/A upgrade, the cost will likely be close to a turbo kit and turbo kit is likley to yiled better result than N/A tuning.
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Old 05-16-2000, 04:38 PM   #5
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2012 dcrawford died
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Yeah, what I am thinking about is not exactly cost effective...but unique. And hey, that is a big part of the car! Not too many out there like that. Besides, I have much more experience with N/A style tuning vs. complicated computer controled stuff and turbos. Oh hell, does that mean I need to spend the money on the MG instead? Damn!

D. Neil Crawford

PS: Hell yeah ScrappyDoo! Let's see what we can find!!

[This message has been edited by dcrawford (edited May 16, 2000).]
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Old 05-16-2000, 05:23 PM   #6
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I think one of the problems is that the internal mod guys usually have owned older cars and are baffled by the engine management issues, and the tuners who understand the engine mangement system don't want to open up the engine. Its like a frickin Reese's Peanut Butter Cup commercial. If we could just somehow unite the two disciplines we would have the Super Imprezza!



BTW Neil, I just ordered all the seals for my 1 year long, 1971 911 project. The body shop said it is just about ready to shoot. That it is my money pit. It is reliable, but it is also very upgradeable. I miss that car so much, that is why I am getting ancy to put the RS under the knife.

[This message has been edited by boxerman (edited May 16, 2000).]
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