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How can you get 300hp?

 
Old 01-07-2019, 05:46 PM
  #16  
PF
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I thank everyone for their tips. I am looking for modifications in natural aspirated form only and will look into some of the tips provide here. I now feel confident that I will reach the goals I set up for this project.

Thanks
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Old 01-07-2019, 08:00 PM
  #17  
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The design 1 supercharger does not necessarily blow motors. I have one and my motor hasnít blown.
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Old 01-07-2019, 08:35 PM
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It will also blow his motor, like many did.
There are now 60 D1R supercharged 968 out there. Apparently none has "blown" yet, but might be only a question of time till some head gaskets will give way.
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Old 01-07-2019, 08:55 PM
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Originally Posted by MN
There are now 60 D1R supercharged 968 out there. Apparently none has "blown" yet, but might be only a question of time till some head gaskets will give way.
Lol. If only people spoke up. Ask the guy who was left holding the bag on supporting those blown head gaskets.
As far as it being a matter of time, in stock form these engines can last a long time without blowing their head gaskets.
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Old 01-08-2019, 12:18 AM
  #20  
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Letís get back on topic since Iím aspiring for more N/A hp as well. However, Iíve given up on peak HP - I want the car to be even more of a hoot to drive on track days. Useable and reliable power is what I want.

Has anyone had their stock 968 throttle body bored out? Any measureable results?

Iím going to do a good head refresh, valve job and some port work, along with RS headers, exhaust (supplier yet to be determined) and the bored throttle body. Maybe mild cams as well. And then a Behe tune.

If Iím short of my goals - oh well. At least I tried and those new Miata RF look nice 👍

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Old 01-09-2019, 07:08 PM
  #21  
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Talk to RS Barn about a new engine build and cam mod. I had this done last year.
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Old 01-10-2019, 01:27 PM
  #22  
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Michael Mount is an engine builder. He is a member here and knows what works and how well. Reach out to him to see what he recommends.
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Old 01-10-2019, 10:30 PM
  #23  
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I thought Mount retired.
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Old 01-11-2019, 05:41 PM
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Originally Posted by rap
I thought Mount retired.
Alive and well and doing plenty of work.
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Old 01-22-2019, 02:10 PM
  #25  
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Old 01-25-2019, 04:37 PM
  #26  
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Originally Posted by PF View Post
modifications in natural aspirated form only .. feel confident that I will reach the goals I set up for this project.
Chevy V8 would do it easily
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Old 01-25-2019, 04:56 PM
  #27  
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Originally Posted by MN View Post
Chevy V8 would do it easily
All the respect to American V8:s but I am trying a "What if Porsche built a 924 RS"


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Old 01-26-2019, 12:53 AM
  #28  
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Originally Posted by PF View Post
All the respect to American V8:s but I am trying a "What if Porsche built a 924 RS"


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An modern American V8 might well do it, with +30 years of technological advancement over a vintage 4 cylinder....

Carry on PF and don't mind the static.

T
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Old 01-26-2019, 07:19 PM
  #29  
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A Porsche 987 3,4L made a bit under 300HP in 2007, it'll be a challenge to make that with less displacement and fewer cylinders. An offset crank grind and overbore, cams, head porting, intake, header and modern engine management should manage it particularly if you can tune for E85. The engine build will cost about what a used 987 3.4 costs in the USA.
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Old 01-26-2019, 10:33 PM
  #30  
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" intake, header and modern engine management" should get you +15-25 HP. Add less restrictive exhaust, higher flow fuel injectors. That is the cheap part.
The rest of the way is the expensive part! " offset crank grind and overbore, cams, head porting" $$$$$$.
If you are going to do it, start with the easy stuff. OEM the 3 liter 968 seems to be pretty efficient, if only it had 1000 more rpm.

-Yogii
AKA 968 Virgin
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