Originally posted by kinger:
Originally posted by DemonSVT:
Then factor in one with larger valves, better head porting, ~11.5 CR and with 92-93 octane available at the pump and the overall numbers would be Very close for comparison! No waiting for boost required either!


No way you will get those #'s out of a 3L NA on 91, guranteed. So your argument means nothing. I don't wait long for boost either.




My comparison is very valid. I am sorry you just do NOT want to hear it.

My main comparison was against an average S/C 2.5 because we all know the average turbo charged 2.5L crushes your numbers.
In this case alone I was very surprised at how little HP gain there was through the entire power band (the average tells the story!) for an engine 20% larger. As I have stated before the expected TQ increase was most definitely present!

I threw in the SHOShop numbers as a representation of a well tuned 3L (which AGAIN I specifically stated) and pointed out how well it compared up until 5000rpm. (I was actually quite shocked myself)

Also if you re-read my posts you will see I based all this off of POS 91 octane tractor gas. Lots of folks can get high quality 92-95 octane at any pump the come across but I only mentioned that as a footnote. I did not use those numbers for a comparison.

Also the part of my post you DID quote specifically stated 92-93 octane fuel. I am quite confident a well built and tuned high CR 3L with large valves can make 240-250 FWHP & 220-230FWTQ with out resorting to race fuel. Again I only added it as an example footnote.
Also an engine built like that would most definitely surpass your numbers up to 5000-5500rpm and only start to trail after that. But I bet the overall power averages (not just PEAK numbers) would be very close.
For example the SHOShop 3L's "average" power numbers are only 6-7% lower.


I will say that probably a better example of "average power" would have been after the IMRC point and in the true powerband. Say from 4500rpm on up. Especially for comparison against a NA car.
However using the numbers below that showed how strong a hot NA 3L or more specifically any turbo can be.
I originally started the chart with just the average turbo & S/C 2.5L's numbers. I then threw in the NA car's for a better overall feel of the engine's numbers verses other combonations out there.
Afterall that's exactly what we are all comparing our's to. Each other's cars.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.