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

[efahl]

Originally Posted by pk2

250whp is certainly nothing to sneeze at, and that’s all stock? Tempting. I thought I’d seen “crank” numbers which didn’t seem terribly impressive.

I have forced induction. With a modest boost (a 10% pulley change) (and retuning) I figure I can hit or exceed 300 hp, (an arbitrary goal I set). I’d really like to do it though without blowing it up, to much fun to drive.

At 300hp would you still bother with new pistons? Would that be to lower the compression? Who sells pistons and other internals for these things?

Hi Peter,

My 3.4 has a dry cone filter in front of a bigger MAF body and custom plumbing to the throttle body, TTP headers and cats, and re-mapped ECU (the dyno numbers came from the mapping session).

I really don't know what's inside any Porsche motors, haven't torn one apart yet, so I don't have any reason to say the stock 2.5 pistons won't be good for 300 HP other than that they are pretty high compression for a boosted motor.

I would go to Wiseco, Arias or Ross for custom pistons. You can usually get them for about $100 each, at least that's the ballpark for Audi parts. Rods can be had from Pauter or Carillo for about the same, if the Porsche parts turn out to be weak (the 2.5 is the odd man out with 72 mm stroke, I'm guessing that all the 78 mm stroke motors - 2.7, 3.2 and 3.4 - share their bottom end components for stocking and manufacturing efficiency).

Eric

[efahl]

Ok, guys, time to start accumulating motor part info...

http://www.not2fast.com/porsche/engine_dimensions.shtml

Who has an engine taken apart, or has access to parts and can measure them? I'm very interested as to whether my speculation about the 78 mm stroke engines sharing crank and rods is correct.

Eric

[pk2]

Originally Posted by efahl

Ok, guys, time to start accumulating motor part info...

http://www.not2fast.com/porsche/engine_dimensions.shtml

Who has an engine taken apart, or has access to parts and can measure them? I'm very interested as to whether my speculation about the 78 mm stroke engines sharing crank and rods is correct.

Eric

Pretty cool site Eric, I haven’t blown up this motor… yet, so I can't rip it apart & measure the stroke my self.

Be interesting to see if the 78's do share a crank and rods, would open the door to some interesting mods. I have "heard tell" though, that the Boxster's case is of a weaker design and maybe even metallurgically different.

I’m not quite psyched to rip my motor out and apart. I just picked up a real deal on an h20 Injection setup. From what I’ve read, they really do quite a job. So I don’t think I’m going to have a compelling (read necessary) reason to rip it apart to soon.

I’d really like to get a tired, cheap, 2,5…well forget that… 3.2-3.6 to pull apart and monkey around with it since there’s obviously a source for internals (like those you cited) make a swap when convenient. I wonder what practically & realistically can be done with them. (I’m really getting quite tired of “hp gain claim, game”)

Regards, Peter

[Gary in BR]

PK,

Good luck on the h2o instal.

Keep us informed on how the setup goes, how about pre and post dynos??

[pk2]

Originally Posted by Gary in BR

PK,

Good luck on the h2o instal.

Keep us informed on how the setup goes, how about pre and post dynos??

Sure will, for better or for worse.

Spent half the day trying to find the specs for the Boxster fuel injectors (cc/min.). Finally found it, need it for an equation to pick the right water nozzle/injector size.

3 different ways to run the injector, not yet sure what route I’m going to go.

Regards, PK


PK

[pinzgo]

Hi Guys, Just to make up to date on my project. I own a Boxster S 2000 with 32000 miles on it. Last year I added Supercharger, catback, headers, ecu reflash by IA, Bigger injectors, air intake, lowered suspension, Put aerokit and full carbon trunk lid after spoiler and brake light, hard top, porsche seats with carbon shell, Kinesis wheels, Short shifter, carbon console,
This winter I am addind intercooler in trunk with fan onto lid, nitro sprayed on intercooler and progressive water methanol injection just prior to trottle body to refresh engine some more to higher psi. So,With these upgrades I will put smaller pulley on supercharger to get almost 7 psi at trottle body.

I hope I will dyno it around 375 whp. I do street and quarter mile drag with it in a team with my sons. They have a S2000 and a STI. Huge feeling.
Add comments or recommendations please.

I would like to send you pictures, but I need somebody of you to tell me how to insert in posts. I am not a pro with computer use.

I appreciate you guys with all infos contained in forums
Jacques

[Gary in BR]

Jacques,

I am glad you finally made it here.

You and I spoke via email back in May of last year when you where installing your supercharger. Glad to hear that you got everything running.

You seem like you are coming at this project very aggressively and I commend you for it.

If you look back at some conversations we have had on this board, you will see some of us have addressed what you are about to do. We would love to hear the details of the fan on the intercooler and I for one would love to hear about the NOS on the intercooler.

You jumped into a conversation about mething an intake and it seems like you may already have it worked out. Please post what you have planned because it will help a few Boxster owners out.

Midway through this thread you will see a link to another forum where this conversation is taking place also. there is some good info on that thread also.

If you have pictures if the car send them to me and I will post them.

PM me and I will give you my email address for the pictures. I am out of town and only have my cell for the web so I can not check my PM until Monday. (I see I have 3 of them so if you are one of them I will get back to you on Monday).

One last note, you will get better answers and more help if you start a new thread and not cross post the same message 2 or 3 times.

Make it a great night, we all want to hear about this project.

[pk2]

Originally Posted by pinzgo

Hi Guys, Just to make up to date on my project. ...375 whp. I do street and quarter mile drag with it in a team with my sons. They have a S2000 and a STI. Huge feeling.
Add comments or recommendations please.

I would like to send you pictures, but I need somebody of you to tell me how to insert in posts. I am not a pro with computer use.

I appreciate you guys with all infos contained in forums
Jacques

Jacque,

You’ve done good with your post. Add am image by uploading it to a place like this: http://img87.imageshack.us it will give you a URL in a couple different formats. One will be for forums. Just copy and paste it under the text of your post and push “preview post”. It probably won’t work. So just try some others (URL formats) till it previews O.K. Press “submit reply”. Your done.

Sounds like quite ambitious with your “S”. I’m doing similar with my 2.5, boosting from 4.5 psi to 6 or so. I don’t think my little Eaton blower will do much more with out spinning itself silly and/or taking up more hp to run it than it puts out. Haven’t done the math yet.

I’m doing just h20/meth injection. As far as I can tell it alone should do the trick. I thought a lot about IC and the trunk seemed Ideal but I didn’t feel like cutting holes in my trunk so it could breath.

Have fun, keep us posted,

PK