That was an awesome YouTube video! Would love a fly by...........but you gotta mash on it!

question
 

Hi Larry,

First of all, the car sounds amazing!!

My question is that, does the interior get too hot due to having the radiators in front?

Many Thanks.

i have not driven much as of yet so i can answer that question as to the 930. i do however have another 911 with a sbc engine and i have had it for several years. it does have a tendency to heat the cockpit. however, i took certain percautions with the 930. the trick is to isolate the heat from the radiator and not allow it to migrate away from the radiator enclosure. if you can insulate and capture the heated air it is possible to keep the heat away from the cockpit..otherwise it becomes a real problem..most likely i will redo the radiator shrouding much as i have the 930 and hope that the heat can be controlled..

Larry,

What is the fuel capacity of the 930, and also the capacity of the one with sbc engine?

I know you haven't ridden the 930 that much, but what fuel mileage are you expecting from her and what is the fuel mileage you get out of the full thank from the blue Porsche?

Many Thanks!

the fuel tank on both hold approximately 18.5 gallons. i have never checked the mpg but i would think the blue one gets 18 to 20 and might expect about the same in the 930. both are very lightweight cars and the 930 gearboxes have relatively tall final gearing.

reenforcing the v-eight conversion to me...needed an alternator for my sbc...not the ls7 conversion. Five minutes to remove...twenty minutes to autozone and back...and ten minutes to put it back on! and best of all a replacement alternator for 45.00 dollars with a lifetime guarantee. not bad, not bad at all for a maintenance item on a 585 chp engine!

Hello Larry,

I could not find information about the head cylinders on your Ls7 engine, I am very interested to know more detail about them.

Many Thanks!

if you go to mast motorsports site and click on cylinder heads you will see a listing of availability.. part number 510-309. this is the complete and assembled head assembly.

Totally agree, I finally hit my 1st 3K miles on my LS2 swap and needed to do an oil change while at the same time change my plugs. All items stocked on the shelf @ Advance Auto and job took less than 1 hr, probably took me longer to jack the car and waiting for it cool down before i slid under.

after rebuilding the pedal cluster and replacing the clutch cable i finally gave in and sent the flywheel,clutch, pressuree plate and throwout bearing back to Kennedy Engineered Products for testing. i could not get the clutch to freely disengage. Monty from KEP just called and the pressure plate diaphram was cracked. it was all new stuff and was covered by warranty. thank goodness as i did not have any other possible answers to the problem. hopefully i will be ready for the street again...soon!

Do the Livorsi guages provide an odometer function?

H

yes the GPS speedometer does provide odometer and a trip odometer as well. the darkened shape area is the digital readout. same for the tachometer which can digitally display several engine functions as well. seperate switches provide for function and mode changes to those gauges.

I'm not a fan of these kind of swaps, but this one looks very nicely done. I think the reason I'm not a fan, is having seen too many ugly butchered hack jobs. Bravo on taking the time to do it right.

The only thing I'd do differently is flip the radiator the other way and exhaust it out through the hood, like the RSR. You'll get better high speed stability that way, since all the radiator exhaust is now above the car providing downforce, instead of under the car providing lift.

http://www.revmods.com/wp-content/up...gt3-rsr-01.jpg

yes i thought about that but my hood is aluminum and i just did not wish to modify it. i do have a stock hood and there is always rhe fiberglass ones. i might look into that in the future. i had considered splitting the flow...some out the top and some out the bottom so that the top opening would be smaller. thanks for looking in!

Thanks Lin. I ordered a kit from RH. It should be here Mid-December. Since I'm not re-inventing the wheel on any of that, it frees me to be more creative with some of the details. I really like your gauges and, while the stock VDO gauges are cool, they're really kinda crappy. Crappy lighting, crappy functionality, etc. It's something to think about. I'm a ways off from having to make that decision though.

I have another couple of questions for you, if you don't mind. What did you do for the parking brake? Can you post a picture of the center tunnel from the shifter back? I always admired that shift tower but I've never seen it used in a street car - only racers.

Thanks,

Hal

i do not have a parking brake. removed long ago. i did try an inline valve to lock off the rears but removed it as well. might try that again. the 11.4 compression of the engine seems to hold really well...so i have not worried to much about it and south carolina does not have an inspection system. a couple of pics with the Hargett shifter for shifting..http://forums.pelicanparts.com/uploa...1320157971.jpg
http://forums.pelicanparts.com/uploa...1320158043.jpg

just cranked the car up for the first time in several weeks. i had the motor and transaxle out for a clutch problem..KEP stage 2. according to monty at KEP the clutch diaphram was cracked and not releasing the clutch plate all the way and the clutch plate was dragging on the flywheel. it feels right now and the Hargett shifter shifts into gear very smoothly. hope to hit the road this afternoon for a few miles...and while i was down i replaced the fikse fm10s with fm5s. i wanted a five petal wheel pattern. im just not sure that i want to leave the centers polished. decisions...decisions..

Don't forget to take an in car video this time!

Lin,

That's fantastic. Thank you very much. I guess I need to read the inspection stuff for Texas. We have inspections but it's possible it isn't required. And, of course, there are no hills in Houston.

I'll setup a build thread when I finally get started. I'm going to try to collect all the parts before I start so as to minimize down-time. Unlike you, I only have 1 Porsche. ;)

H

took the car out for 20 miles of various traffic conditions and all seemed well. it was 60 degrees when i was out so it was not hot. temperatures ran at 180 or a bit above. too cool for a real test. oil temperature ran at 190 degrees once the oil had heated. the engine pulls really well even though i just putted...got to break the engine and clutch plate in for a few hundred miles. i can tell that the car will accelerate quickly. a couple of adjustments..program the fuel sender into the ecu so that my gas gauge works properly and develop the heating and defroster systems off the radiator shroud. neither of these will keep me from driving.

Lin,

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

;)

H

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.

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.

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?

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!

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.http://forums.pelicanparts.com/uploa...1321549183.jpg
http://forums.pelicanparts.com/uploa...1321549228.jpg
http://forums.pelicanparts.com/uploa...1321549272.jpg

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.

left the gauge cluster pic off.http://forums.pelicanparts.com/uploa...1321567240.jpg

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,:)

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?

Hi Larry,

Any attempt to reduce the throttle sensitivity?

Still waiting for the drive by hammer down video!

Many Thanks.

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. http://forums.pelicanparts.com/uploa...1323033060.jpg

Larry,

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

thanks!

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.

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!

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???

Carson,

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

Hal

Dual radiators
 

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

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

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