BoxsterLS376 introduction - LS3 conversion :)

[BoxsterLS376]

Originally Posted by BRAN

the V8 centered under Boxster probably would look best, but dang, there is the spoiler

... i start to like the green the more i look at it

I like that! It is a shame the spoiler would get in the way. That is why I tried it on the bumper in one of the pictures to try and avoid the spoiler...

I definitely dig the ideas so keep em coming!

[BoxsterLS376]

So I almost forgot to mention that I just confirmed today that there will in fact be a Porsche 918 at the WannaGoFast 1/2 mile drag race this weekend!!

I've put the word out and called him out for a race through his shop so we will see!

I know he'll smoke my ass but just to line up with him and have his pass me at full tilt will be amazing to see!!!!

:dance:

Hope to see you all there!
J

[Smallblock454]

Hi John,

because the car now has an american muscle and rumble – and is some kind of hot rod – how about a very simple:



All the URL stuff you can put on the number plate holders (if you have some).

918 - hm, maybe he wins, but your car will sound better.

Regards, Markus

[BoxsterLS376]

Greetings all,

I know I posted this in a separate thread, but wanted to make sure it was attached here as well~

Well semi-successful day at the Wanna Go Fast event in Clayton, GA today! I'm not sure if anyone else has run a Boxster at these type of events so I'll unofficially say I have the worlds fastest Boxster!! Although I know there are a few out there badder then mine i'm sure!

I was able to get 4 runs in until I broke the brand new axles DOH!!! I was expecting it, hence the reason I trailered the car to the event rather then drove it! Even brought spare axles but it was to late to bother trying to repair it trackside.

If nothing else I'm a consistent driver!!
Run 1 vs. 928 - 141.3317 mph - WIN
Run 2 vs. 2014 SVT Mustang - 142.0455 mph - WIN
Run 3 - vs. 498 RWHP C6 Corvette - 142.4953 mph - LOSS Got me by 3 MPH but it was neck and neck!
Run 4 - vs. 2017 Stage 3 Roush Mustang 670+ HP - 142.4953 mph!!!! - LOSS Dude hit 150.1 GOOD JOB! Not too shabby for something he just bought off the showroom floor and is still under warranty!!

So if you look at runs 3 & 4 - That's no typo!! Back to back 142.4953!!! WooHoo! All 4 runs averaged to be within .29 MPH of each other - I'd take the Pepsi challenge against the PDK anyway with those numbers

Hopefully the videos came out OK - Of course the best race vs. the vet I don't think I turned on the camera.

Wanna ride shotgun in the Boxster LS376/480 for a full 1/2 mile?!?!? - Well then here ya go! https://youtu.be/IQnfV9x5uGA





OH YEAH! Just in case you guys don't think racing like this is exciting or dangerous - tell that to this poor little guy!!


Yeah that is stuck as F about 150 feet down a hill off the end of the runway - Racing is dangerous kids!!!

[BruceH]

Impressive! Bummer about the axle though.

[BoxsterLS376]

Originally Posted by BruceH

Impressive! Bummer about the axle though.

Thanks Bruce! Went over to the shop today and fixed it, took about an hour. This time it actually sheared the axle right in half!!

I figure if you are not breaking things you are not trying hard enough!

[Smallblock454]

Hi John,

nice video, thanks.

Well, seems to be you car is an axle eater. Maybe you have to look for a kind of GT2 axles.

Regards, Markus

[BoxsterLS376]

Originally Posted by Smallblock454

Hi John,

nice video, thanks.

Well, seems to be you car is an axle eater. Maybe you have to look for a kind of GT2 axles.

Regards, Markus

Thanks Markus!

Yeah they definitely seem to be the weak link. I've contacted a few companies and I know it can be done, it is just a matter of cost. I know one company can do them, but cost is like $2800 which to be honest is more then I'm going to spend on a solution for now - i'll just not drag race it anymore in the mean time

[Smallblock454]

Hello John,

well, 2.800 USD is a lot of money. The OEM 986S axles should be able to handle around 500 Nm in normal street use. But on the drag track that might be different, because of a different grip situation - less slip.

Also maybe it's good that the axles are the weak part, because if you always would need a new gearbox or differential this might be much more expensive journey.

Regards, Markus

[BoxsterLS376]

Originally Posted by Smallblock454

Hello John,

well, 2.800 USD is a lot of money. The OEM 986S axles should be able to handle around 500 Nm in normal street use. But on the drag track that might be different, because of a different grip situation - less slip.

Also maybe it's good that the axles are the weak part, because if you always would need a new gearbox or differential this might be much more expensive journey.

Regards, Markus

Yeah from the research i'm doing the factory axles "should" be good for about 550HP, but considering I am trying to get the car tuned and will be making very close to that number I really need to find a better solution. The good news is that used gearboxes are fairly cheap so if that breaks I can get one for like $1200, cheaper then upgraded axles!

Oh yeah so the #1 company on the list for upgraded driveshafts quoted about $3500 for a custom set of axles. F-that. i'll break a few dozen more cheap ones for that price. UGH.

[Smallblock454]

Hello John,

i don't think the HP is the main problem for the rear axles. It's more the torque. 500 Nm is equivalent to approx. 370 ft.lb.

Regards, Markus

[shockandawe]

John it's more the angle of the axles causing the problem. What does Renagade use to prevent the problem?

[BoxsterLS376]

Originally Posted by Smallblock454

Hello John,

i don't think the HP is the main problem for the rear axles. It's more the torque. 500 Nm is equivalent to approx. 370 ft.lb.


Regards, Markus

Haha well I'm way past that already so another solution is indeed necessary!

Originally Posted by shockandawe

John it's more the angle of the axles causing the problem. What does Renagade use to prevent the problem?

No I don't think it's the angle, it is not much steeper then stock.

Renegade didn't have any solutions other then changing them out every 3000 miles at the time. I have decided not to waste any more of my time talking with them. They were moderately useful during the project and that's about it. Lots of run around and vague answers.

The problem is the components are not strong enough to support the power the car is making under race conditions. Mind you these axles were OK for the last 3000 miles under relatively normal street use. I think the multiple hard first gear launches and even harder shifts into second just killed it.

I am talking with another company and see if they can come up with a solution, otherwise i'll just keep using cheap axles and won't drag launch it in first gear!

Thanks
J

[Bayley]

How much different are the 996 turbo axles?

Just thinking aloud here, but I wonder the effort involved in swapping to a 996 turbo rear hub. I ass-u-me that the bolt pattern to the trans is still 120mm, so all you really need to do is get that axle though the bearing... which typically requires machining out the hub for the larger outer diameter, or just swapping the whole knuckle.

I've never seen a 996 rear hub or knuckle, so I have no idea how far into left field this is is...

[Ben006]

The knuckle are a lot different due to the achitecture of the 996 rear suspensions.
I'm sure you can find ones for less than what the 1st company quoted you
Good luck !

[BoxsterLS376]

Originally Posted by Bayley

How much different are the 996 turbo axles?

Just thinking aloud here, but I wonder the effort involved in swapping to a 996 turbo rear hub. I ass-u-me that the bolt pattern to the trans is still 120mm, so all you really need to do is get that axle though the bearing... which typically requires machining out the hub for the larger outer diameter, or just swapping the whole knuckle.

I've never seen a 996 rear hub or knuckle, so I have no idea how far into left field this is is...

I thought about going down this route, but to be honest the though of acquiring the parts alone turned me off due to cost, it all adds up really quick.

I am talking with another company who has a great reputation, if they come up with a good price then i'll go with them, otherwise I'm going to piece a set together myself using Porsche 930 CV parts. Lots of stuff readily available out there as they use the 930 transmission in a lot of off road and dune buggy applications.

Originally Posted by Ben006

The knuckle are a lot different due to the achitecture of the 996 rear suspensions.
I'm sure you can find ones for less than what the 1st company quoted you
Good luck !

Yup it would require quite a bit of work and added expense which is what I'm trying to avoid! Hopefully this company I'm talking with can come up with a reasonable setup.

How much is reasonable you ask? Well that all depends of course! To build them right with what I would call "the good stuff", I think If I can get them done for $2500 or just under.
It all depends on the parts you use though, I know I can build them for less and probably save $500 or so, but how long will they last?

Nice thing is if I build them then I can rebuild them easily enough and then I could upgrade whatever fails later.

Either way I'm kinda broke right now so we will see, hopefully my ebay stuff starts selling! Anyone need a 3.6 Liter 911 engine?!?!?!

[steved0x]

Originally Posted by Ben006

The knuckle are a lot different due to the achitecture of the 996 rear suspensions.
I'm sure you can find ones for less than what the 1st company quoted you
Good luck !

Crazy idea, maybe the front carriers from a 996 TT? Since the base boxster uses the same carriers front and back and S uses the same style but beefier in the back, maybe that could work?

[BoxsterLS376]

Originally Posted by steved0x

Crazy idea, maybe the front carriers from a 996 TT? Since the base boxster uses the same carriers front and back and S uses the same style but beefier in the back, maybe that could work?

Yeah thats kinda getting back to the more effort then it is worth category, plus parts etc. definitely would not end up cheaper~


So regarding the axles it looks like the best solution is going to be to make a custom set using 930 CV joint setup. They are commonly used in off road conversion and high HP applications. Many different parts available but it could be done for as little as about $1,600... That includes custom stub ends, "high performance" 930 CV joints,bolts pre-drilled for safety wire, flanges & boots and would use a chromoly axle shaft.

Me, I'm a do it once kinda guy so if I were to do it i'd prefer to use all the high end stuff. This of course bumps the price up quite a bit by about $1000~, biggest differences being upgraded CV joints and stronger axles.

Either way, for right now given my current budget for I think the best thing to do is just not drag race it with first gear launches Just gonna leave the inexpensive axles in for now~

[BoxsterLS376]

Greetings everyone,

So I finally decided to strap the mufflers back onto the V8 car and made a final video here to compare the 2 systems. It takes less then an hour to swap them out once you know what you are doing, although i'd love to build a valved system for it one day, this will have to do for now!

The sound is a bit harsh from the bumper cam but you get the idea. The car is so much more civilized with the mufflers and i'm sure my neighbors appreciate it

It still has that great v8 sound but for the unknowing they will probably think the ol' Boxster has got a misfire going on or something.

Anyway I made a video with a little bit of straight pipe vs. mufflers comparison, hope you enjoy it! Still uploading till about 11PM EST so give it a few more minutes and the link should be working~

https://youtu.be/1sc4haWY1L8

Thanks~
J

[Smallblock454]

Hello John,

well – i think you need an exhaust with a flap. So you can regulate the noise level. And i totally agree that the straight though pipes are too loud. My neighbours would kill me immediately.

So a flap with a little extra muffler might be a good idea – just soundwise.

Regards & thanks for the video
Markus