2.7 conversion to high HP motor??

[Turbodrvn]

Hello all,

I am continuing to search for my next Porsche 911. I have a few options. I'm curious about what it takes to convert a '71 Chassis w/ 2.7 motor to a High HP motor. Any recommendations? Should I look into a 3.0? or a 3.2?? or even a 3.3 turbo conversion?? Trying to keep my costs down to around $6,000 for a high HP motor. How real can this be? Any suggestions? Any advice is much appreciated.

Thanks in advance!

[Jack Olsen]

I think you answer your own question. If it's only horsepower you're after, get a 3.3 Turbo motor, cross your fingers, and hang on.

A hopped-up 2.7 is great if you're in a racing class where there are limits on displacement, or you need to keep the car's overall weight under control. But if it's just a 'Need for Speed,' then there's no substitute for a turbo.

[dean]

But I doubt you can do if for $6k. I would say $8k. I did it for around $7k. I did get a "good deal" on the motor. I paid $5k for the motor.
Have fun

[marcesq]

IMHO you should first determine the desired power to weight ratio. 1hp to 10lb seems to be a ratio that will put a car in the elite class, and 1:8 would be a rocket.

Next determine the use of the car, street . . . street/track . . . track.

Having purchased a '77 with a 2.7, I would not put 6k into maxing out the 2.7. I just bought a 3.2 and figure that the total cost for swap and chip will be 6k. This buys me 233 hp and my car weighs in at 2500lb. Not quite 1:10, but I can live with it.

Each engine that you mention (3.0, 3.2, 3.6) each have problem during a given year, so search this board for each engine to find the issues.

I don't think that you be able to do a 3.6 conversion for 6k. You would be lucky to find the engine for that price.

I can't speak to the turbo motor.

Remember brakes and suspension need upgrading if more hp is introduced to the narrow body.

Good luck.

[Turbodrvn]

I appreciate all the quick responses. I am truly hunting for a whole lot of hp!! I have 2 other highly modified Turbo cars and consider myself a Speed Demon!! So yes, HP is definitely a MUST. I'm trying to research as much as possible and am considering several options.

The reason for this specific subject is that I've encountered a '71 chasis with a solid 2.7 motor with an upgraded 90's body made out of Kevlar (???????) with extended rear turbo widebody flares. Eventually I would like to swap to a motor with much higher HP!! The Owner stated he already upgraded to '85 Brakes and suspension has coil overs. The pics look great of this car. But obviously, it'll be all show and NO GO........which is something I'm not used to; I'm used to lots of HP with my other cars.

part of me is just thinking to buy a Turbo 930 in the first place instead of spending all the money to make a non-turbo 911 perform like a turbo 911.

Thanks again for all the feedback............I'll keep researching.

Hopefully soon, I'll have the right Porsche!

[Jack Olsen]

Part of me is just thinking to buy a Turbo 930 in the first place instead of spending all the money to make a non-turbo 911 perform like a turbo 911.

This would save you a lot of time and money.

[Wayne 962]

The most you could reliably increase the 2.7 to is about 2.9. Any teardown and rebuild of the 2.7 will cost you about $6000 in parts and machine work - and this is only for a stock motor. Best bet is to purchase a used 3.0L and work with that, but you will pay about $4500 for the base engine, and probably about $6-$10 on top of that to get it to give you more HP...

-Wayne

[RarlyL8]

Porsche high performance on a budget?
I can't imagine doing a turbo swap for $6K unless you own a 911 junkyard and do all your own work.

A stock Euro 3.3T (if you can find one) puts out 300hp. Going up from there cost you $1000+ for each mod made. And that's just parts cost. Pray that the motor doesn't need a rebuild. That'll can set you back $6+K just for the parts.

If you want some truly affordable power you might look into the V8 conversion (just don't tell anyone around here about it).

[Turbodrvn]

thanks again for the responses guys. I forgot to mention that it's a 2.7S motor. What's the "S" for?? pros and cons please to a 2.7S compared to a 2.7 or any other motor.

Thanks again!

[H20911]

I am not sure that you can do a reliable chevy v8 conversion for 6k unless you already have an engine.

kit=1500+
rad kit = 1100+
torsion bars = about 300

engines range from wrecking yards (1000 complete) to Bill Mitchelle's 675hp 600+tq. sold through summit racing at 10k+

other things to consider are the trans.

at 250hp or less the 901 box might live a short life (useless)

at 400hp or less and less than 325 tq the 915 box can survive


but the trans needs to be a 930 turbo box or G50 (short version) if you are going to go over 400hp and have torque also. I have heard and read that these boxes are good for 700hp and 600tq.
you will have at least 2500 into the trans. and before you know it you will be buying a custom starter ring gear pp and clutch disc (add another 900+).

the stater gear alone was 410 bucks a wack (bought 3 of them before I solved a depth engagement problem...........that sucked) found a better source that I use ( only pay 135 for them now).

I have found that the power puts a smile on your face. the torque is a real kick.

I suspect that if you really have some high powered cars that are in the 450+hp and 425tq cars that are in the 2600lbs (or less range) and that is the only thing that puts a smile on your face....... then you will never be happy with the porsche. It is not about that. You should move on to another car. You will have way more then 6K into it to make it faster (mid 11 sec or less).

[Turbodrvn]

H2O911:

Wow, your 911 pic looks incredible!! Is your 911 for sale??
Thanks for your input; I wouldn't mind a Buick GN 3.8 Turbo motor either, but not sure if anyone has accomplished this or not? But part of me would like to have an authentic Porsche all around so I'm trying to stick with a porsche motor.

Both my turbodriven vehicles are about 475 to 500HP but they weigh in at around 3800 lbs. I'll be happy with low 12's or high 11's with my future Porsche 911.

I'll just continue to search all avenues at this point. First, I have to get the right Porsche 911 !!

[RarlyL8]

Hey Aquaman, got that rocket on the road yet?

If I understand, the meat of this thread is performance on a budget. Porsche and budget are mutually exclusive terms. Buying the car is only the entry fee. It gets nuts from there.

Any turbo car would be streching it. If the only criteria is getting into the 12's then buy some gutted lightweight early 911 with a big engine in it. (2000lb @ 250hp = 8lb/hp, same as your 475hp 3800lb turbo car).
Maintenance cost need to be considered.