Thoughts? Cayenne V8 in a Boxster?
 

I have done something like 12 V8 conversions in 914's. I'm thinking about taking on a Boxster conversion using a Cayenne V8.

What do you think?

You cant hurt my feelings. It would still be Porsche powered (unlike the 914's I have built with SBC's in them)

Thoughts?

B

I WANT ONE! I WANT ONE!! I WANT ONE!!! :dance:

I doubt anyone here would tell you they think it's a bad idea... more power in our cars? Of course you should try it!

The question for me is, "Will that big thing fit in the small space provided in a boxster?"

The question for me is, "What do you call it?"

Price wise and time wise doesnt it make more sense to supercharge the car? I'm sure that will take up about half the funds and time to do and it would be just as fast ,if not faster then the Chayenne V8.Just my two cents.

Let's see...

Boxenne

Boxsterate

Or why not just name it "the german beast" and send it out to spank every E55 it can find on weekends?

I guess calling it the Coxster would be insensitive and innappropriate? :o

Cayenne V8's are for pussies.

This is a conversion motor, baby.

Twin turbo V20, 3500hp and 13,000 ft/lbs of torque.

http://img468.imageshack.us/img468/9947/dsc023913qm.jpg

Better get some GOOD brakes and sticky tires.

I might have trouble getting that in there :)

but the engine bay of the Boxster is wider than the engine bay of the Cayenne. The length is fine also. My biggest concern is top to bottom on the Cayenne V8.

It wouldnt surprise me at all if the Boxster tranny's would bolt right up to a Audi S4 twin turbo or Audi S4 V8. They all use a Audi tranny!!

I need a Boxster rolling chassis for a few weeks.


B

JEEZ!!

I'm dumb. I have a 01 Boxster S with the engine out right now!! available for test fitting..

I'm really dumb. Not stupid (I can learn)

Shrink that pic their Todd'r


B

Since we are posting pictures of big engines:

http://www.bath.ac.uk/~ccsshb/12cyl/

102 rpm. All torque, baby.

On the idea of a V8, if it fits and doesn't throw off the weight and balance too much, I say go for it.

I'll say it then. Bad idea. You lose the balance of a flat engine. I would rather have a 3.8F or 3.6F TT than a V8 :matchup:

Ha ha.. people for years told me the same thing about the V8 914 conversions.

Then they drove one. That additional weight (50lbs or so higher than the crank centerline) didnt make much difference to them after they hit the loud pedal one time.

Suspension and setup is NO issue for me.

Here is something to chew on:

An aluminum headed/alum. intake/ fully dressed SBC weighs LESS than a fully dressed 930 turbo engine!! The SBC will set you back $4500 for 450hp.

I have a couple of Boxster engines fully dressed that I can weigh. I need access to the Cayenne V8. I'll have to call LA P-car dismantlers and see of they have a engine from a Cayenne. I havent talked to Todd in awhile!

As an enthusiast I'd rather see a built up 3.8 Flat six putting out 380 - 440 HP Naturally Aspirated with an high red-line than a hefty V-8 in a boxster.

KRZ

I'm right there with you!

but.. It wasnt until just recently that Porsche broke the 100hp per liter magic number in a production engine.

It will be awhile before the aftermarket really steps up on the development of the newer wet sump engines.

Thanks for all the responses. I appreciate it.


B

Giving up on the 4.0 10k engine with the M90 blower?

CW

screw the old fashioned flat 6 values, shove a v8 in there and watch what a boxster chasis will do. i bet that would whip anything in straights or corners you can put out there. If i had a v8 box, i'd leave the engine running in the garage and sit there and listen to it. porsche charges too much for a 6 cylinder that puts out honda power.

I would guess it's not so much the added weight of the V8, rather where that weight is... I submit the girth of it would be too high. That's one of the great thing about boxer engines, the low center of gravity. Would it be transversely mounted?

Ha ha ha on the M90. Still poking around on it.

I do agree about *some* weight being moved up, but not more than having a 200lb buddy riding with you. The V8's have composite intakes and all aluminum engines.

I personally dont believe your would feel the "polar moment" difference between the two.

I have driven/raced several V8 914's. I know the difference.

OK. UPDATE:

The Audi S4 V6 twin turbo will bolt to a Boxster tranny! This means there is a good possibility that the Audi V8 will bolt to it also!


B

A Coxster!

V8 Boxster, should be interesting, go for it!!! It'll be pretty fast with all that torque available on tap. Post pics if you do it, and when your done post the video!!! Also, someone said that the 2.7 twin turbo bolts right up, that should also be pretty interesting, both engines would be great on the box!!! Good luck on what ever choice you make

The V8 is too tall to fit in there! Two things are certain...if it is possible it will cost mucho dinero and you will not have an operational top...or no top at all!

That is better than a "Gayman"!!!


B

OK. One of my friend is working on this:

Audi V6 twin turb 2.7 S4 engine with a BoxsterS 6 speed in a 914.

If this V6 fits under the engine lid of a 914 (with room to spare) it will easily fit under the Boxster engine cover. You actually have a LOT of room above the engine lid with the top down.

http://www.914club.com/bbs2/uploads/...1145080210.jpg


B

Here is a new CaymanS engine and trans out of the car. You can "estimate" the distance from the top of the tranny to the top of the intake manifold (use your eyecrometer)..LOL

http://70.95.221.233/Cayman/Dsc03705.jpg



B

I like the fact of using a Porsche engine vice an LS V8 or an Audi engine, but my personal opinion is that is would change the character of the car too much.

I say go for it, and if youre going to do it.. do it right with the V8 turbo from the Turbo, Turbo S, or the GTS

-Power for the GTS comes from an upgraded 4.8 liter V8 that makes 405 horsepower at 6,500 rpm along with 369 lb-ft at 3,500 rpm, up 20 hp on the S

-This time around, 520 hp wouldn't do, given that the face-lifted regular 2008 Cayenne Turbo saw a power boost from 450 hp to 500 hp. It only took a new intake system and a tweaked and remapped engine management system for the Turbo S to get another 50 hp for a total of 550 out of the new 4.8-liter, direct-injection, twin-turbo V-8. Torque escalates from 516 to an even loftier 553 lb-ft, available between 2250 and 4500 rpm.

The result is phenomenal performance. zero to 60 mph takes a claimed 4.7 seconds, down 0.2 second from the regular Turbo. Top speed increases by 3 mph to 174, making the Cayenne Turbo S the fastest SUV available...

AND IT WEIGHTS 5,600LBS!!!

Imagine that engine (2009 Turbo S) In a Boxster weighing about 3100lbs..... and what do you think the 0-60 times and the top speed will be.... ???

It just makes me want to think about doing this conversion myself if at all possible... :D :D :dance: :cheers:

"PepperBox"

Interesting concept, though.

Can't be called anything with "box" in the name since a V8 is not a flat six.

How about: V8ster? or Vster?

As a fan of many car makes and not to ruffle the purist feathers....in the name of proven performance and costs why not a LS1, LS2, LS3 or LS6 GM V8? Are the dimensions much different (I'm guessing the deck height will be taller) than Porsche or Audi V-8's? Tranny fitmant would probably be an issue, not to mention torque capacity of it. Just asking....... :cheers: .

I say go for it.

I wouldn't want it so tight that I had to pull the motor to change sparkplugs and I think you'd have to address the issue of excess heat. But other than that I say go for it!

:cheers:

I say go for it, but be warned the electronics issues involved in such a conversion will be very daunting, much much more so than a SBC.

Sounds like what you are doing is building a Boxster version of a Daytona Prototype car. And that sounds VERY cool. The DP cars are all mid-engined, and the Porsche motor is based on the Cayenne V8. Granted, the DP cars are 500HP and 2275LBS, but 400 HP and 2850lbs is not a bad street legal compromise.
And the possible names:
986 Daytona
Boxster DP

I vote for new model designation: 986.8

I want.

Uhh, did everyone miss that this thread started in 06?

I cought that it was '06, but I was not around then to see it the first time. I have been wondering about the possibility of shoving one of those motors in my 944, but I would need one laying around first to try.

does anyone have the specs (dimensions) of the cayenne engine and the boxster engine bay .. or engine bay and trunk?

How about

"Boxsticles" or the "The Box Kahuna" or just the Porsche "Boohyah" :cheers:

Boxster with SBC
 

Sounds good to me. If you do it, let me know. I'll be your first customer.

Talk is cheap. I say this does not happen.

:)