Boxster V8 conversion !!!, Goto last few pages and see the LS1 being fit!!! Options

[bdtoel]

Looks like the LS1 has found a nice new home!

Keep up the great work and pix coming.

Brian

(IMG:style_emoticons/default/clap56.gif)

[ernestj911@gmail...]

This is getting better by the day. WOW!!!

[andys]

Brad,

A couple of observations/inputs/questions;
Appears as though there's some room at the back of the motor. Is it possible to move the motor back a bit to give you some room in the front for a water pump or a remote drive water pump/AC? An LS2 water pump is about 2" shorter than the LS1; perhaps it might fit if you have the option to move the motor back a bit? Utilizing the stock type water pump would avoid a lot of custom remote drive stuff. I dont know how feasible it is to move the motor/trans back; are the drive flanges lined up with the hubs (front to back)? As for the height, the trans mounting would probably dictate that.

I suppose it's a bit early in the process to start asking a bunch of questions; sorry 'bout that. Untill you get the motor and trans mated together, it will be hard to get an exact position. At least the good news is that the damned thing seems to fit! Keep us abreast of your progress.

Andys

[cbulen]

One of the problems with mounting a V8 longitudinal in the MR2 chassis is the ultrashort wheelbase of a Gen2 MR2 (biggest car of the 3 generations made) @ 94.5" Compare to a pantera at 98.4" (ford 315 cleveland small block, ford to ZF bellhousing, ZF transaxle).

I don't know what the wheelbase of the boxter is, but given your planned location for the LS1, I was wondering where your axle output flanges are on the transaxle, in relation to the rear wheel arches?

I am not sure of your adaptor plate thickness, so I am assuming its sandwhiched between the engine and trans.

[ernestj911@gmail...]

Brad,

A couple of observations/inputs/questions;
Appears as though there's some room at the back of the motor. Is it possible to move the motor back a bit to give you some room in the front for a water pump or a remote drive water pump/AC? An LS2 water pump is about 2" shorter than the LS1; perhaps it might fit if you have the option to move the motor back a bit? Utilizing the stock type water pump would avoid a lot of custom remote drive stuff. I dont know how feasible it is to move the motor/trans back; are the drive flanges lined up with the hubs (front to back)? As for the height, the trans mounting would probably dictate that.

I suppose it's a bit early in the process to start asking a bunch of questions; sorry 'bout that. Untill you get the motor and trans mated together, it will be hard to get an exact position. At least the good news is that the damned thing seems to fit! Keep us abreast of your progress.

Andys

No, no, no, please do not move the motor back as keeping the 50/50 is up most important.

[BKLA]

The real question is:

is there room for 180 degree headers? Having a boxster with an unusual exhaust note ( not a six and not a normal eight) would be "tight".

Might lose some of the rear trunk.

[J P Stein]

"who gives a shit" is closing fast in the poll but the Chebbie raises my interest level to "Hummm". (IMG:style_emoticons/default/idea.gif)

[grantsfo]

"who gives a shit" is closing fast in the poll but the Chebbie raises my interest level to "Hummm". (IMG:style_emoticons/default/idea.gif)

Best you stick with something safe like a Miata or MR2. Wouldnt want you to hurt yourself. Move along and leave the "giving a shit" to us who are up for the challenge of putting 400 HP down effectively in the Box. (IMG:style_emoticons/default/happy11.gif)

[Borderline]

I went to Marina yesterday expecting to see some black boxster boasting a TTOD, but he wasn't there. Did you send it down to Brad to have that V8 installed already?

[grantsfo]

I went to Marina yesterday expecting to see some black boxster boasting a TTOD, but he wasn't there. Did you send it down to Brad to have that V8 installed already?

I was delayed coming out of China then Narita airport - got last seat on a flight to Hawaii and then found another flight home. So I didnt get home until midnight Saturday. I was still asleep at 10 AM SUnday. But V8 is definitely on the menu if Brad figures out cost effective conversion.

[Brad Roberts]

A couple of observations/inputs/questions;
Appears as though there's some room at the back of the motor. Is it possible to move the motor back a bit to give you some room in the front for a water pump or a remote drive water pump/AC? An LS2 water pump is about 2" shorter than the LS1; perhaps it might fit if you have the option to move the motor back a bit? Utilizing the stock type water pump would avoid a lot of custom remote drive stuff. I dont know how feasible it is to move the motor/trans back; are the drive flanges lined up with the hubs (front to back)? As for the height, the trans mounting would probably dictate that.

I cannot move the engine back any further than what you see. The BoxsterS has BAD axle angles to begin with.. moving it back further would compound the already extreme axle angles they have from stock (IMG:style_emoticons/default/sad.gif)

The custom remote drive stuff: Mezier. They are just south of me in Escondido. They have an LS series electric pump with remote block off plates and a thermostat complete.


B

[cbulen]

Best you stick with something safe like a Miata or MR2. Wouldnt want you to hurt yourself. Move along and leave the "giving a shit" to us who are up for the challenge of putting 400 HP down effectively in the Box. (IMG:style_emoticons/default/happy11.gif)

(IMG:style_emoticons/default/bootyshake.gif) Ahem! grumble, grumble like Clint in Gran Torino

A couple of observations/inputs/questions;
Appears as though there's some room at the back of the motor. Is it possible to move the motor back a bit to give you some room in the front for a water pump or a remote drive water pump/AC? An LS2 water pump is about 2" shorter than the LS1; perhaps it might fit if you have the option to move the motor back a bit? Utilizing the stock type water pump would avoid a lot of custom remote drive stuff. I dont know how feasible it is to move the motor/trans back; are the drive flanges lined up with the hubs (front to back)? As for the height, the trans mounting would probably dictate that.

I cannot move the engine back any further than what you see. The BoxsterS has BAD axle angles to begin with.. moving it back further would compound the already extreme axle angles they have from stock (IMG:style_emoticons/default/sad.gif)

The custom remote drive stuff: Mezier. They are just south of me in Escondido. They have an LS series electric pump with remote block off plates and a thermostat complete.

B

What drive angles do you anticipate having? THis was a problem I had to deal with on my own project. I found in my research that having more than 4 or 5 degrees will cause annoying vibration in the CV joints. I also found that having 0 degrees on a rear wheel drive car that does not have steering rear wheels is not desirable either, 1 to 3 degrees is the preferred angle. This keeps the vibration and wear down. A small angle also keeps the joints from creating dimples in the races.

A high angle creates vibration and excessive wear. CV joints have a lot of sliding friction, and tend to get hot. This is why special grease is required.

[Brad Roberts]

I needed some inspiration today.. and I was dropping off the BoxsterS for a roll cage.. thought I'd pop the hood off the current SCCA World Challenge car being finished up at the shop to snap some pics of how the belt arrangement works and to look at some "go fast" parts for the LS1 engine. This is a 750hp LS series engine. I would like to use this intake manifold, they cut it down right where the throttle body attaches.. this would allow me to run the throttle body under the stock Boxster engine lid (IMG:style_emoticons/default/clap56.gif)


B

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[Brad Roberts]

I found in my research that having more than 4 or 5 degrees will cause annoying vibration in the CV joints.

Not sure how you came up with this.. but.. I deal with some heavy hitters in the off-road market. These guy's KNOW CV's like nobody does. Think 38inches of wheel travel through a typical 930 Porsche CV joint.. for 1000miles in Baja (IMG:style_emoticons/default/smile.gif)

The BoxsterS utilizes a larger CV joint than the 930 108mm CV. It is designed to handle extreme angles (the car ships stock with 6-8 degrees from the factory) I know I'm going to end up with more in it due to the length of the V8+adapter, but.. but.. I'm not worried. My off-road guy's have me covered when I start blowing up CV's. I'll have new stub axles and output flanges made for the Boxster tranny and uprights and move to the "stupid" large 935 style CV (actually it was used in the 934.5 Porsche) and can be run with upwards of 750hp and 22 degrees of angle (IMG:style_emoticons/default/smile.gif)


B

[andys]

I needed some inspiration today.. and I was dropping off the BoxsterS for a roll cage.. thought I'd pop the hood off the current SCCA World Challenge car being finished up at the shop to snap some pics of how the belt arrangement works and to look at some "go fast" parts for the LS1 engine. This is a 750hp LS series engine. I would like to use this intake manifold, they cut it down right where the throttle body attaches.. this would allow me to run the throttle body under the stock Boxster engine lid (IMG:style_emoticons/default/clap56.gif)


B

Brad,

Is that a reverse rotation water pump? I don't recognize the brand, though it looks stockish. Check out Wegner Motorsports for a good resource for special LS stuff like pulleys and pulley drive flanges; They also offer race style reverse rotation water pumps.

Here's how I did the drive system on my 914 using a stock (LS2) water pump and LS6 Vette dampener. You can also see how I moved the outlet to the side, rather than pointing straight forward. I also re-directed the inlet on the T-stat housing for a more favorable routing. Also added a photo comparing the LS2 water pump next to a LS1 water pump.

Andys

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[andys]

Oops, that photo doesn't show the water pump outlet pointing to the right side of the motor. Here you go:

Andys

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[Brad Roberts]

Thank you VERY much Andy (IMG:style_emoticons/default/clap56.gif) As I dig in deeper.. I'm finding literally 10-15 different ways to route the stock components. I would prefer to utilize as many stock components as possible, but I just don't have the room at the front of the engine. I have to use a balancer with the serpentine groove right up against the timing cover (much like the old 6cyl GM dual groove balancer Renegade used to sell.

I knew about the truck water pump being short.. still learning..

Andy? Do you have time next week for me to visit? I'll be up at the shop for 2-3 days straight working on projects and fitting the seat into the BoxsterS "Super Spec" car.


B

[Brad Roberts]

I hit the easy button (IMG:style_emoticons/default/lol.gif)

I'll have a prototype damper at the end of next week for test fitting. Called a place I know that has a rapid prototyping machine and makes dampers for LS series engines. Explained what I needed and they jumped on it. When done, it will have a BRAG part number (IMG:style_emoticons/default/smile.gif)

Now I have two places working on a damper.


B

[silver arrow]

As long as it can be done for a reasonable price, without a lot of custom fab, this will be a really neat option for a fast DD. (IMG:style_emoticons/default/mueba.gif)

BTW, why not the Audi V8? seems like it would be easier with the trans mounting right up.

[Brad Roberts]

I'd do the Audi first, but I don't have the money to buy the engine (I have an S4 located near me for $3500) but I have yet to find anyone willing to help with the project moneywise.


B