first purchase for another LS conversion

[not_hans_stuck]

Lin,

We need video brother! Post some stuff on youtube. Your adoring public demands a fly-by video!!!



H

[lin7310948]

ill see what i can do about a video. out again for a while up and down the interstate...still breaking things in properly. cooling and oil temps are fine at least in this temperature this morning. got my fuel level sender programmed into the four in gauge and master gauge. it seems to be measuring accurately. got the Hargett shifter zeroed in. now i need to install the Stage 8 locks and clips onto the inner CV joints on both sides. still have to add antifreeze to the cooling system, so i am getting close for now.

[lin7310948]

getting more and more breakin miles on the car. got the livorsi fuel gauge and sender programmed in and the fuel gauge seems to be measuring accurately. still having to get used to the Drive by Wire throttle. it is very touchy and the slightest movement of the foot transfers immediately to the engine with corresponding RPM increase. i believe that the computer can be adjusted so that the DBW feature is not quite so sensitive. the Ls7 engine revs freely and the throttle response is immediate. still have to fabricate a heater system which should be relatively simple. overall i am very pleased with the conversion to date and the motor is warranted for a year with no mileage limotation.

[lin7310948]

opened up a three inch port on the rear of the radiator shroud and mounted an adaptor for three inch flexible hose. i also ordered a twelve volt three inch bilge blower to move the air along for the interior and the defrosters...if necessary. i will use an on-off switch to control. the blower is specced at 170 cfm which should be more than adequate. i will make an adaptor to split the air to the defrosters. otherwise i have almost 500 miles on the engine and clutch...so the break in period is over. i can only say that 700 plus chp and over 600 ft/lbs naturally aspirated horsepower do not match up well with cold tires and cold pavement. the 425 rwhp of the hotrod 3.4 turbo motor that was replaced by the ls7 is no comparioson in terms of forward movement. and with 75 to 100 pounds less weight in the rear of the car it feels much better balanced...anecdotal seat of the pants feel about the car... i would recommend similar conversions to anyone wanting to avoid the major costs associated with similar porsche flatsix horsepower. and with all forged internals it would be quite easy to add another 100-200 chp with nitrous to the mast motorsports ls7 427....and weighing less than 2400 pounds does not hurt?

[Yan2947]

Larry,

Have you weighed your car yet? I just took my 89 911 to the local transfer station to weigh the are. Originally I had a scales guy weigh the car - which probably isn't as acurate at the weigh station scale. It was originally 2612 before the conversion but now it weighs 2940 lbs? That includes the 14 lb skid plate. I will have to re-weigh it to make sure it went up that much but it seems like quite a bit. My car is completely stock with the addition of the ls1 and rear mounted radiator. The car goes to the porsche shop in an hour to have new heavier torsion bars mounted.

HAS ANYONE ACTUALLY WEIGHED THEIR CONVERSION?

THANKS!

[lin7310948]

i had weighed my car a few years back and it was slightly less than 2400 pounds. with the conversion i would expect to beconsiderably under that as the ls engine is much lighter, the ducktail is really much lighter than the gt2 tail that i had, i removed the mattre aluminum part cage and associated harnesses, removed the front ventilation system, rennline dash piece, livorsi gauges are featyherweight compared to the vdos, and a couple of other lesser items. i do have sport seats and standard three point safety belts but am considering going to lighter seats such as pole positions. first change i will try to find a set of drive on scales to weigh the car. years ago i removed all the unnecessary items such as the radio, ad, sound pad and most mastic insulation, handbrakes and associated hardware, installed lexan windows exceot for the windshield, fiberglass bumper covers, aluminum hood, 935 mirrors, etc.

[lin7310948]

livorsi gauges left to right...oil temperature, gps speedometer, 4 in 1 gauge displaying water temp, volts, fuel level, oil pressure, tachometer with digital display area for engine functions, and fuel pressure gauge. the gps antenna is on the rear package shelf .the gauges are backlit with red led lighting.

[lin7310948]

left the gauge cluster pic off.

[Mikey83835]

Originally Posted by lin7310948

i had weighed my car a few years back and it was slightly less than 2400 pounds. with the conversion i would expect to beconsiderably under that as the ls engine is much lighter, the ducktail is really much lighter than the gt2 tail that i had, i removed the mattre aluminum part cage and associated harnesses, removed the front ventilation system, rennline dash piece, livorsi gauges are featyherweight compared to the vdos, and a couple of other lesser items. i do have sport seats and standard three point safety belts but am considering going to lighter seats such as pole positions. first change i will try to find a set of drive on scales to weigh the car. years ago i removed all the unnecessary items such as the radio, ad, sound pad and most mastic insulation, handbrakes and associated hardware, installed lexan windows exceot for the windshield, fiberglass bumper covers, aluminum hood, 935 mirrors, etc.

I REALLY like the car, and your weight reduction measures, if I rated higher than C- on the mechanical ability scale, (and was not so old and doufless, heeh) I would build one very similar,

[lin7310948]

i temporarily placed an in line blower into the three inch flexible tubing from the radiator shroud. i can say that it really blows heat into the interior of the car. unfortunately i do not have a good control of the heat and the volume. i hope to find a couple of three inch in line manual 3 inch dampers to make it possible to control the flow air to the interior as well as the defrosters. i will take a couple of pics.. there is plenty of heat available from the radiator shroud...kinda the porsche system in reverse...why bother with installing a hot water heater?

[dtakenname]

Hi Larry,

Any attempt to reduce the throttle sensitivity?

Still waiting for the drive by hammer down video!

Many Thanks.

[lin7310948]

got the software loaded into my computer. plans are to link up via the internet with mast motorsports...who built the engine and programmed the ecu..and let one of their tuners look at the engine parameters under running conditions and make necessary adjustments. should only be minor to smooth out low rpm operation. i most likely will have them to reset the sensitivity. i have never done it this way but i trust them for this. got the ''''heater and defrosters ''''working this past week. maybe a bit hokey for some but works well, adds hardly any weight, blows lots of heated air, and is very simple. i even used one of the Ford dash vent regulators to direct air under the dash on the passenger side. the 3 inch bilge blower moves lots of air when turned on.

[Yan2947]

Larry,

can you post some photos to show the connection to the radiator of your heat duct work.

thanks!

[lin7310948]

yan, i bought a couple ofthree inch bolt on ports from advance auto. i cut a three inch opening in the rear...exit side...of the radiator shroud and sealed and bolt the port in place..over to the side to clear the spare tire. then i built a very lightweight metal distribution box . this air distribution has four ports...2 2.5 ports and 2 three inch ports. one three inch is for the hot air supply and the other three inch port is ducted through the bulkhead directly over the passenger side foot board. the other two ports are for the defroster air. i used one of the Ford vents for the interior heat duct. by manually adjusting the direction as well as the opening of the vent i can force more air to the defrosters. of course i am not in really cold weather in south carolina. the blower is a 25 dollar 3 inch bilge blower that blows about 150 CFM. so it has plenty of force. by turning the blower off from a dash mounted switch i can almost close off all hot air to the interior. as a note i would think that you could just run two hot air supply ducts to the regular porsche air distribution intakes and use the existing porsche blower up front...just remove the air supply ducts from the source in the cab and cap off, close off the holes on either side behind the dash...might work better and give much better control.

[lin7310948]

well just experienced my first remote tuning from mast motorsports...interesting. adjusted the idle up a bit, slowed down the drive by wire pedal sensitivity a bit, and made a few other adjustments. interesting that i can hook my car ecu to my computer and then they can make tuning adjustments from 1800 miles away via the internet while viewing all the engine paramaters. cant drive it today as i have the drivers seat out for an upholstery repair. hopefully the adjustments will improve the areas i was concerned with.. ill keep you posted!

[lin7310948]

adjustments improved the driveability but have another session scheduled with Mast Motorsports this morning. drive by wire pedal sensitivity adjustment really helped. made a quick 300 mile roundtip to charlotte last thursday and all went well and gas mileage seemed better than i expected...not really sure as i did not measure precisely. oh well it is what it is. i suppose that the best miles per gallon is just sensible driving. the cold pavement and cold tires make traction under much throttle rather tricky...but is very easy on the drive line. all in all i am very satisfied with the conversion. still undecided on the seats. i have very nice sport seats and new three point safety belts and reels and loosing another 40 pounds due to lighter seats really does not improve the power to weight ratio very much....but???

[not_hans_stuck]

Originally Posted by carsonmx114

I can't believe the nerve of you "hot rodders"!! It's blasphemy!! Just joking...I've been watching Todd's for months. I've already spoken with Steve at RH, I'm going to do the same thing as soon as my Master card cools off a bit from my transmission/ interior/ bumper cover purchase. I'm thinking twin turbo LS1 at some point though. I'm also planning on dual cubed radiators behind the front bumper cover...I don't want to give up my trunk space and I have a friend that works at a place that builds custom radiators and intercoolers. I was turned off be the idea at first but, more hp, less weight, and much less money...not a real hard decision for me.

Carson,

Did your dual cubed radiator idea work out? If so, can you post pictures?

Hal

[carsonmx114]

Hal,
My cooling is working great. Here's some pics.
LS1build.wmv - YouTube

[Yan2947]

Larry,

check out this link on your car:

Video: Porsche 911 Gets a 700 HP LS7 Heart Transplant - LSXTV.com

and here:

LS7 Powered Porsche 911 is a Motorheads Wet Dream

Yan

[lin7310948]

yan thanks for posting. i did not realize that other entities gleaned the info and posted to their sites.