89 911 LS1 Conversion

[lin7310948]

i am installing a modified ls7 motor in my 78 930 and the rear of the car will have to be lowered from the height with the 930 motor. the car will weigh about 2300 pounds and the engine dynoed at slightly over 700 chp and over 600 ft lbs torque. rev limit is set at 7200 rpm.

[Yan2947]

I have to admit I am not a race car driver. I have not gone to any tack and the roads I have timed my car have been two lane country roads. The biggest problem I see with reaching some low 0-60 times is having to change gears. My G50 gets to about 30 MPH in 1st gear and then just through 60 in second. I actually had a faster time of 4.57 just by starting in 2nd gear. If anyone could launch the car faster I'm sure you could shave some time off easily. I could spend some big bucks and get some tall gears and my times would be incredible. The reality is that I like my car. It has a lot of power and is fun to drive. I don't plawn on racing it in a Nascar event. Perhaps a car show, taking the women out to dinner and picking my son up at school. The car is a blast. Everyone looks when they hear the motor and then their look turns to disbelief when they see its a 911. Some of the builds going on right now are just amazing. Mine is just average. The car is running well. Yesterday reached the 80's and the car drove like a charm. The coolant temp remained below 200 but I didn't do any launches. Still, the car is cooling well. Perhaps the electric fans will come on a bit more.

As far as handling goes... The car handles incredible. I don't see any change. With the exception... This car has a lot more power and one must re-think the same curves in the road. Its a lot easier to go faster thru the turn. The car handles the same but if you are 30 miles faster then with a 3.2 one must watch out and not get to cocky. I will try a 0 to 100 soon...

[drmatera]

DAMN you guys are making me wish i didn't have my 930.... the 911 / LS1 combo is a match made in heaven

[FinallyGotOne]

I'd love to have an under 5 second time! I wonder what the ceiling is as far as lightening the 79 SC to try and improve the 0-60 times. For instance, If I got ligher wheels, race seats, removed all the power mirror and windows, A/C... Running a 3.0 with the 74 911 OEM Exhaust and muffler, no air pump, short shift.. How low is the lowest times I could get down to. I mean I still have the CIS, and tame cam. Seems I would hiit a wall eventually. (not physically , I mean I'd hit a point where there is no more benefit to being any lighter) I kept hearing about changing the Gearing but I hear that if I do that i'll have weaker gears and the potential to break them is increased. Even if the Corvette engine is not a 0-60 monster, I bet the 0-100 would be incredible. I could just see taching out 1st then hitting the long second gear and the pull would be comparable to a turbo ...

[Yan2947]

Drove the car to NYC and back. I had some high speeds and some light traffic conditions. The weather was very humid and was about 87 degrees. On the open road the car remained just above 200 degrees until I gave the car some gas. The temp moved as high as 220 at about 80 mph and above but never went over that number. Any time I went below 80 the coolant temp stayed around 200. When I was idle it always dropped between 180 and 200. City driving was always 180 to 200 degrees. I still don't have my front spoiler on - just lazy - or chin spoiler so at high speeds I could feel the air go under the car. At 125 I was a little nervous...

[paulgtr]

Originally Posted by FinallyGotOne

I'd love to have an under 5 second time! I wonder what the ceiling is as far as lightening the 79 SC to try and improve the 0-60 times. For instance, If I got ligher wheels, race seats, removed all the power mirror and windows, A/C... Running a 3.0 with the 74 911 OEM Exhaust and muffler, no air pump, short shift.. How low is the lowest times I could get down to. I mean I still have the CIS, and tame cam. Seems I would hiit a wall eventually. (not physically , I mean I'd hit a point where there is no more benefit to being any lighter) I kept hearing about changing the Gearing but I hear that if I do that i'll have weaker gears and the potential to break them is increased. Even if the Corvette engine is not a 0-60 monster, I bet the 0-100 would be incredible. I could just see taching out 1st then hitting the long second gear and the pull would be comparable to a turbo ...

911's are not dragsters. the engine in the back screws that up. the best part about the engine in the back is being able to get power down coming through and out of a corner. do a DE day and you will never complain again about 0-60 times.

[ej911]

Originally Posted by drmatera

DAMN you guys are making me wish i didn't have my 930.... the 911 / LS1 combo is a match made in heaven

From what I have heard the best combo is the 930 4spd and the LS1 or LS2 or LS7. Renegade says that the best car to do is the 930, cause you have the 4spd, the brakes, the suspension and the wide-body for more rubber. I am looking for a cheap 930 to do a LS7 on.

[Yan2947]

911's are normally not dragsters. Put an LS1 into it and your whole idea of what a 911 is changes. As far as cornering - it does that too!

[drmatera]

i'm a bit baffled by the statement that a rear engine car makes a bad dragster. It's great weight transfer

[Larry_Ratcliff]

Its a very interesting idea. I have considered it over the years. However, heres the thing. There is always a sweet spot of usable horsepower...

An LS* series engine does weigh LESS than a porsche flat six. So all of the handling arguements really go out the door. This is what got me seriously considering the possibilities. However, the LS engine does not sound like a porsche (which is seriously what has kept me from doing it). I am not a purist and wish you well on your endeavors. However, this is where I bring back my initial assertion. My previous car ... 74 911 RS conversion with a 3.6 was amazing. With around 300 HP the car was crazy fast. It was 2348 pounds b/c I had AC. However, it would hit 60 in 3.6 seconds and would just hook up and go. I have doubts whether a guy could do better 0-60 times with even 100 more hp due to lack of traction... All I had to do with the 3.6 was hammer it after a sane start. What I am getting at is the LS series conversion is not really cheap. You could probably do a 3.6 swap for close to the same money and have all the power the chassis can handle.

Anyway, enjoy ... its your car make it the way you want!

[Larry_Ratcliff]

Originally Posted by Yan2947

Started taking apart the ls1. Removed the wiring harness/computer, water pump and power steering pump. Its looking a bit lighter.

I should have read further into the thread before replying Enjoy. I am curious to know your 0-60 times..

[Yan2947]

The tail transformation is complete. Fiberglass cap at the end of the radiator bolts right on and off. I know its not stock with the add on, but it hides the monster below pretty well.

[77TARGAV8]

If you ever get to Long Island NY let me know. I have a 77 targa widebody that has a R.H. kit. 377 c.i. afr heads and edelbrocks pro flow f.i. almost done with the body now. The motor makes 425 h.p. and has a 78 930 4 speed tranny. This winter maybe twin turbos!
I like the forum but keep a low profile cause the purists like to tear u up. I love the body of the porsche, and nothing like cheap h.p. of a chevy!
Nice ride! You made a good car a super car now!

[Yan2947]

Just added a skid plate under the oil pan. It weighs 13 lbs and should save my pan from any more "accidents" Here are some photos:











I will need to put in torsion bars because the car was squating too much with the torque. The skid plate should solve me destroying the oil pan but I still wanted to upgrade the torsion bars. Any ideas by any of the other lsx conversions... Anyone else hit the oil pan?

[sirhiss]

Hello Yan

What about a oil sump from a Corvette? it is 1 inch shallower and this should help. Here is a picture of my sump after the first test drive (see the scrabe in the mittle)
And this was under test drive with only 70% throttle. I think i will upgrade to 26-28 mm torsion bars but i first have to look what i have in the car now. Have a nice day

[Yan2947]

Sirhiss,

I'm sure you saw the photo on my previous page. Last one on the bottom with the smashed oil pan. I am not sure sure that you would save an inch with the Corvette pan. I will let you know what I find out about the torsion bars also. Not sure what I have but they most be stock for the 89 911. Good luck!

[LJ851]

Some of the turbo guys (same problem with torque) use coilover rear shocks in addition to torsion bars to combat squat. One of the advantages of doing it that way is the ability to have a progessive or staged spring rate so the car will still ride nicely.

[Yan2947]

One 0 to 60 run today on a nice fall morning - 0 to 60 in second gear only, 4.27 seconds. With a little practice I will be sub 3's. My stock Ls1 seems like plenty of Sunday Driving fun!

[e p slick]

Just to mix up the Porsche purists I built a set of 180 degree headers for my V8 911.

EP Slick - Tucson

[whiterabbit]

Originally Posted by Larry_Ratcliff

Its a very interesting idea. I have considered it over the years. However, heres the thing. There is always a sweet spot of usable horsepower...

An LS* series engine does weigh LESS than a porsche flat six. So all of the handling arguements really go out the door. This is what got me seriously considering the possibilities. However, the LS engine does not sound like a porsche (which is seriously what has kept me from doing it). I am not a purist and wish you well on your endeavors. However, this is where I bring back my initial assertion. My previous car ... 74 911 RS conversion with a 3.6 was amazing. With around 300 HP the car was crazy fast. It was 2348 pounds b/c I had AC. However, it would hit 60 in 3.6 seconds and would just hook up and go. I have doubts whether a guy could do better 0-60 times with even 100 more hp due to lack of traction... All I had to do with the 3.6 was hammer it after a sane start. What I am getting at is the LS series conversion is not really cheap. You could probably do a 3.6 swap for close to the same money and have all the power the chassis can handle.

Anyway, enjoy ... its your car make it the way you want!

This is all very cool. I am thinking that the this LS1, a 3.6 or even a 3.5 big bore conversion are all going to be extremely fast (sub 4 secs) to 60 in a light car assuming they all have the same gearing.

It would be very interesting to see an LS1 against a 3.5 big bore and a 3.6 conversion on the strip in cars weighing 2500lbs or so.