2001 Porsche 996 LS1 Conversion Thread by 1dirtyZ

7 minute(s) of a 536 minute read

so i guess i should update this thread 

the side skirts showed up

i decided i didn't like how the breather setup is setup 

so i started working on a catchcan / breather assembly. the plan is to get rid of the oil cap breather and put a regular cap . i'll then use the two ports on the passenger side of the engine on the valve covers as well as the port on the back of the driver side cover and have them all plumbed into a small catchcan , and then from the catchcan a hose runs to a small air filter located somewhere convenient. ( i will also have another hose coming out of the vally cover plumbed into the can as soon as i swap the covers )

the issue i'm having now is finding a catch can small enought to fit my needs and the engine compartment , i also have to mount it as high as i can so that it drains back into the engine if it starts collecting oil.

so after searching around for a suitable candidate i came up with nothing , so i decided to make my own :

i started with a short length of aluminum tubing that i squashed and welded plates on both ends :

then drilled holes on both ends and will weldsome bungs in there :

the plan is to have the "in" ungs placed lower on one end of the can , and the "out" on the higher side of the other end.

(will post pics soon )

03.13.12

i finished the catch can :

and how it looks in the car:

and finally some shots of the new shortblock

right now i'm waiting for a bunch of parts to show up to complete the longblock , then i should start mocking up and building the turbos .

mean while i need to just sit down and get the wiring done ; the rpm and temp guages are really pissing me off. 

i'm also planning on removing the deck lid and bumper , and taking them over to get painted along with the rocker panels . that way i don't have to take the car over to a paint shop and have it sit there for god knows how long.

04.13.12

update time 

the camshaft showed up recently along with the lifters, lifter retainers , oil pump, head studs and timing chain and related hardware ,,, so those found their way on to the shortblock

so after spending time on things i should be doing later in the build process , i decided to focus on the wiring again . so i re printed the diagrams and hilighted the wires from the rpm sensor and coolant temp sensor all the way to the cluster. i then proceeded to compare the diagram to the old harness, which turned out to be the same , then i compared the existing harness with the diagram ( checked colors , pin outs , and continuity ) and it all checked out ok . i also checked the CAN BUS wired from the dme to the cluster .

so this means that either :

1- both sensors are shot. 

2- there is some thing i'm missing in the wiring , something having to do with the transmission computer i guess .

it just has me really bummed out right now , i really was hoping to have the wiring issue done by now . 

i guess worst case scenario is getting a brand new interior harness from an auto car and drop it in there and hopefully that would fix it .

but before that i have one more thing to try with the current wiring harness; there are two sets of can-bus wires going out of the DME , one to the cluster and the other set to the auto tranny computer . the thing that i just thought about is that the second set of wires ties in to the other two , which means maybe the rpm and temp signals are carried on that set of wires then it gets tied in to the other set.

off course i could just be speaking jibberish , but i always say try the easiest and cheapest fixes first .

i'm also waiting on the valve springs to show up , so as soon as they do its time to install them on the patriot heads i got and install those on to the shortblock as well as the front and rear covers and call the engine done for now.

05.23.12

i broke down and ordered a new ( used ) interior harness that is off the same car as mine from LAdismantler, so it should be just like the melted one - for an auto car.

aaaaand thats about it 

i have the harness sitting in a box right next to the car and just been to lazy to install it 

i should have it in some time this week and hopefully get the whole guages dilemma behind me !

i'm also just about to take the deck lid and side skirts and rear bumper to get painted , just need to get my *** to the paint shop 

on a side note, the new engine is a little closer to completion : i have the heads on the short block and all buttoned up so now its officially a long block !

i'm planning on installing the LS3 exhaust manifold on the heads just to see how the turbo routing is going to be ( have you noticed how far ahead of myself i'm going - i should focus on finishing the car's interior first! )

so , on to the never ending list :

- take parts to paint.

- install new harness and test

- if all is well re-install interior , if not set car on fire 

- install manifolds on new engine

- install inner fender

06.24.12

update time!

took the stuff to get painted , got it back and it looks good

while i was contemplating installing those parts , i decided to install the new harness. i was in no rush to finish stuff, so i did it in stages ; i took the oul one out , layed the new one in place , wired the engine compartment connectors , spliced into the interior harness , and finally put the throttle cable back in .

the result ,,,,, IT WORKS! 

rpm worked right away and it took a while to get the temp needle to move , but it did 

so this got made me motivated to work some more on the car ( who would have thought it ! ) , so i slapped the decklid and wing and bumper on the car and they look gooood ( sorry no pics )

i still have to install the rocker panels , but those can wait for now.

so next up is :

- putting the interior back in

- retune cold idle ( car just surges from 700 to 2000 rpm regularly )

- pull the car out and get the 10 feet off dust blown off the car.

- install the intake tube 

- install the front inner fender 

wish me luck !