HP, how much can a LIL 2.5L take? How do they Blow?

[pk2]

Originally Posted by Gary in BR

IYour PS explanation is brilliant, makes everything nice and easy.


I think someone needs to try the nitrous... I would hate to be mid corner and the nitrous kicks in...


Speaking of Primer Grey Boxsters.....no I'm kidding...I... parts are 5 - 10 times more expensive and they are unable to pull the high horsepower numbers as easily.

Have a safe new years.

Gary,

Funny my little Postscript upstaged the preceding rambling paragraphs. As to nitrous, I’m personally more interested in power on demand as opposed to temporary power…seems like nitrous is really just good for a drag or 2.

True about mod prices for p=cars, thinking about volume+affordability of Boxsters might sometime justfy reasonably priced aftermarket stuff. But that never happen with my old 928…don’t know where they all went.

WI!

I stuck a toe in the WI waters today and it turned into a bit of a plunge. I bought a (standard issue) Sureflow 150/100 PSI meth/h20 pump on the cheap off ebay, great. So Then going back forth with the guy a bit, he winds up throwing in a bunch of bits and bobs that add up to about 85% of what I need for a complete a basic H2O/meth set up. (I’ve got another 50%, needed to make it work as good as any, (just need some brain power to make it work, a hack but one that’s been done)

So your turbo(s) is running 7 PSI with an intercooler. So if you can do that, I should to, with H20/meth cooling. That’s if I can “pulley” it up without over-revving the Super.

So, I’m committed. Round up a few more parts, pick a few more brains and I think I’m on my way to the Holy Grail, 280 +.

Regards PK

Ps, how did you extrapolate hp from your documented whp? Is there a rule off thumb for conversion? Yours is supposed to 290 hp @ 7 psi and mine is supposed to be 270-280 @ 4.5 psi. Must be a rule of thumb for that to; claims/actual=…)

[Gary in BR]

If I said I am running 7psi I made a mistake its only 6psi.
The last two days with the weather here so cold (its around 30!!) I have seen and felt 6.5psi. and 7 once or twice.


I think there is a rule of thumb for the whp to crank conversion. I think its 1.14 times the dyno number but I am not sure at all.

Here is how I did it:
Porsche claims 201 at the crank my base line dyno showed 164

164 times 1.22 is about 201.

226 times 1.22 is 275 crank.

I will assume right off the bat someone has a better way of finding these numbers but this is the "logical" way to me.

[pk2]

Originally Posted by Gary in BR

...its only 6psi.
The last two days with the weather here so cold (its around 30!!) I have seen and felt 6.5psi. and 7 once or twice..

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That,s funny, I noticed a “cold effect” to, was out at night at maybe 45f a couple of times, engine temp half way up to 180. Rolled out of a parking lot in first and then just stomped on it, no clutching, straight line and i just “lit'm up” like I was on ice.
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Originally Posted by Gary in BR

...I think its 1.14 times the dyno number but I am not sure at all.

Here is how I did it:
Porsche claims 201 at the crank my base line dyno showed 164

164 times 1.22 is about 201.

226 times 1.22 is 275 crank.

I will assume right off the bat someone has a better way of finding these numbers but this is the "logical" way to me.

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Sounds like sound logic. Good enough for me. That’s about what I came up with using my own variables.

Heres How I did it. Using TPC’s claims of 70-80 hp and shaveing off the lowend by 15%...I get 60hp boost at 4.5 PSI.

60 (boosted hp)/4.5 PSI (boost) =13.3hp per 1 psi boost. So, 13.3 hp x 6psi=79.8 hp. So, about 280hp total

I’m probably dead wrong too.

Glad your at 6 PSI though. To get 7 PSI, my SC revs will probably be past recommended 14krpm's, and may be past the point of diminishing returns (more hp to spin it than it can put out).

Thanks PK