3.2 conversion into 71

[Sundevil64]

Q1-Where are you guys mounting the dme, alt correction sensor, and dme relay? In the same location as the 3.2 cars? I am debating whether to go with efi motronic or PMO carbs, or ITB's. There seems to be + and -'s for all. I am leaning toward the simplicity of the PMO carbs. Anyone have any pics of their installs?

Q2-I am sitting on the fence of running the 901 or a euro 915. I like the look of the 901 shifter and the smoothness of the shifts vs. the 915, but the 84 euro 915 I have could be built up to a nice trans for the 3.2. Any advantage or disadvantage to the gearing of the 901 compared to the 915? I am concerned about a weak 1st gear. It's not like I drop the clutch or anything, but just a weakness that I am aware of.

Q3-What is the widest tire size I can fit under the rear of a narrow bodied car? I'm not going to flare. I want the narrow look.

I will also be upgrading the suspension to carrera specs as well as the brakes. I may just use the front carrera brake calipers and leave the stock calipers as they are. I would run quality pads and quality rotors with ducts if necessary.

Q4- Any concerns with the rear trailing arms? I understand they need to be modified?

Q5- Are there any chassis upgrades that are needed due to the increased power? I may install 964 grind cams as well as performance exhaust.

Q6- Any thing else I need to give consideration to?

I will be upgrading oil cooling as well. Due to the heat here in TX I will most likely run dual front fender coolers. I want this car to look like a stock 71 from the outside, or at least close to it.

Thank you in advance.

John

[CidTito]

I have a 69 911T

Where are you guys mounting the dme, alt correction sensor, and dme relay?
>my dme relay is located in the same location as the 3.2 cars

I am debating whether to go with efi motronic or PMO carbs, or ITB's. There seems to be + and -'s for all. I am leaning toward the simplicity of the PMO carbs. Anyone have any pics of their installs?
>i am running motronic, and its pluses might be you don't need to adjust carbs, smoother and more responsive. The minuses of motronic however, is if something happens to the ecu, you get your own set of issues. It is suppose to be plug and play. I have thought of going carbs w/ twin plug a few times

Q2-I am sitting on the fence of running the 901 or a euro 915. I like the look of the 901 shifter and the smoothness of the shifts vs. the 915, but the 84 euro 915 I have could be built up to a nice trans for the 3.2. Any advantage or disadvantage to the gearing of the 901 compared to the 915?

>I am running the 901. I really like the dog leg first gear. The clutch pivot pin my be prone to snapping. The work around might be to add a washer under the pin (raises its height)

I am concerned about a weak 1st gear. It's not like I drop the clutch or anything, but just a weakness that I am aware of.
> just don't do donuts and be nice to it.. 1st gear is fine. You should be pretty happy.

Q3-What is the widest tire size I can fit under the rear of a narrow bodied car? I'm not going to flare. I want the narrow look.
> 15 x 7 is the widest. you'll need to check for rubbings in the front if you use 15 x 7. You might also need to roll the fender.. but maybe not.

I will also be upgrading the suspension to carrera specs as well as the brakes. I may just use the front carrera brake calipers and leave the stock calipers as they are. I would run quality pads and quality rotors with ducts if necessary.
> cool upgrade.. i've been thinking of this same thing, If you this.. i think you need to run 16s so it fits.

Q4- Any concerns with the rear trailing arms? I understand they need to be modified?
> I am running upgraded aluminum trailing arms. There is a hole that will need to filled in and weld with some various rear anti sway bars.

Q5- Are there any chassis upgrades that are needed due to the increased power?
> Consider that X bracing in the front trunk area.

I may install 964 grind cams as well as performance exhaust.
> cool


Q6- Any thing else I need to give consideration to?
> sport seats.

I will be upgrading oil cooling as well. Due to the heat here in TX I will most likely run dual front fender coolers. I want this car to look like a stock 71 from the outside, or at least close to it.
> BAT makes a 44 fin upgraded oil cooler. Consider braided lines, but if you want the look also consider the factory oil lines.

Thank you in advance.

Good luck!
Tito

[Sundevil64]

Thanks Tito. Very helpful.

I have looked at that cooler. I am going to look at running lines inside the rocker (AN16) with an exit at the top rear part of the front wheel well. I have two donor cars and I am going to play with some brazing for custom lines that fit in my budget. I have a tight budget too...

I my seats already, some recaros with early sliders. They are comfy for a 210# guy and look a little retro.

I saw some "x" bracing that was removable. I would like to be able to put luggage and a jack in there if necessary.

Do you have any pics of your control arms. I was going to run stock carrera sway bar, but if the budget allows I will run tarrett bars front and back.

I think the brakes will fit under some 15x7 cookie cutters (light weight). I am also going to look at some 15x7 fuchs when I get closer to that time. I will try some 15x7's upfront. I have a fender roller if need be. I want to put my "s" trim back on the car (alum wheel well trim). I am not sure if this is possible after rolling the fender.

I am leaning towards the 901 because it shifts so much better and it's a lot lighter. I am going to try to lighten the car a little too, with in reason. It's not necessary, but nice. I have 930 that is about 350# lighter and it was noticeable.

I will probably go PMO carbs if it I can work it in the budget or until that point run the stock efi from my donor car. Of which was running fine, now it won't start. I think it is a cht sensor. This is why I am leaning to carbs. This whole sensor thing is crazy when hunting it down. Between the relays, sensors, grounds, and old wiring it's frustrating. I think I answered my own question. I may go microsquirt to localize everything in the engine compartment. I would put the wiring on a diet and be a stand alone system for fuel and spark control only. Not a bunch of relays involved. Also cheaper if I need to replace than servicing a motronic system.

Again, Thank you for the response.

John

[ESully]

Mounting the harness and DME under the drivers seat is not too bad. You need to drill one hole under the rear passenger seat and a couple of mounting holes under the seat. Always have a spare dme relay, but I never had a problem. I did send out the DME to be gone over and to be upgraded for the later chips. The Motronic system worked very well for me.
The later 915 is a bit stronger than the 901. It also has the cutouts for the flywheel sensors, no need to cut the housing on the 901. The 3.2 has a lot more torque, so 1st gear starts are not bad with the later 915.
You will definitley want to mount a front fender cooler. I installed a later SC loop and it worked nicely. You may want the Carrera cooler, Texas is hotter than NY in the summer.
I used the stock '86 chip and it made nice power, but later stock chips like one from the Club Sport make better power. You could always upgrade to an SW chip. I back dated the exhaust with SSI's and a Bursch muffler.
My car is mainly street driven and I only refreshed the stock suspension with new bushings. Stock brakes work well. If I were to drive it hard, I would upgrade the torsion and sway bars.

http://youtu.be/93wgjvunlTo

[Sundevil64]

ESully,

Thanks for the clip. It was very motivating. I am guessing you are running stock cams? I have read some posts about SSI's are a choke point for air flow on the larger motors despite them being a great manifold. I would guess this is trivial with the power of the 3.2 and the lightweight car? I love the sound of your car.

On the cooler, I have a carrera cooler and a 28 row brass cooler.

Thanks again for the clip. It's getting me excited for the car. I need to watch some Magnus Walker vids...

[M_deJong]

915 will require mod to the rear tunnel for clearance. DME requires one really big hole for the harness to go thru plus mods to the rear wiring console to adapt the engine harness. The last I guess you'd have with carbs too.

I put a 3.2 in my 74 last fall. Running ssi's with Dansk sport 1 out muffler and SW chip. I like it.

[Sundevil64]

Hey Mike,

I think we met at the Hill Country Ralley last year? I have the white 930 that shoots flames.

I was not aware the 915 required mods. I have been reading some threads and trying to help another guy with a donor car with regards to wiring. It sounds like a little bit of a mess.

[Flieger]

The 915 sometimes requires a bit of adjustment to the rear seat area. The proper tool is a big hammer.

[Sundevil64]

Well, I do have to put a new rear seat pan, floor pan, and rear tunnel, in as the current metal is badly rusted. As soon as I finish another project I will start this project and start posting the damage. I was thinking about doing something along the lines of a modular rear seat panel that can be removed and access can be gained to the rear of the motor.

I'm pretty good with a hammer.

John

[Sundevil64]

Are you guys happy with the stock sized TB's from the Carrera? or what did you go to. The purpose for this car will be mostly public curvy roads and some DE's. I want it to be a dual purpose car and a drive to the track car.