blade7

No offence to the guys that have done it, it's their money after all, but spending $10's of thousands on a road car isn't for me, you could buy something like a 996tt for the same or less. I've been lucky with some parts and I'd do the building and spannering myself so $10k would put a decent spec 3.0 in my car, but I'm still a little undecided if the end result is worth it. So those that have gone from a well modified 2.5 to a reasonable budget 3.0 what exactly did you get for your spend, and would you do it again ?

Paulyy

I'm sure you can build something nice for 10k

- Pistons $800-1000
- Rods $1000
- Full gasket kit $ ~500
- Turbo upto $2500
- clutch $1500
- chip/tune/injectors - $1200
- 16v minor head work $500?
- modified plenum???
- modified exhaust headers??
- Exhaust ??

Really depends on what parts you use.

blade7

I've got new Carrillo rods, a new LR turbo, a good S2 crank and a good 2.7 engine. I'm well under $2k in at the moment. I'll need pistons/block work, MAF/MAP kit/injectors, clutch, 3" discharge/downpipe, etc. $8k should cover it, the money isn't an issue but yanking out a good engine and refitting another when I don't really need to, or know how much better a 3.0 will be is holding me back. Is it worth $10k and the aggravation ?

fejjj

I am doing a similar build.

These engines if done correctly have more low and mid range torque and long term reliability.

My goals are 350 RWHP at 12lbs of boost.

Paulyy

reliability would be better, depends how well its built. quality of parts ect.

I like my 2.5 Yes it could be better with more bottom end torque, but i like the lag, i like how my engine runs & i like the powerband.

Its really what you're after. power wise, ect

Dutch944

I think i'll just not comment here..

Maybe if you need some proper injectors (750cc) i can hook you up.. they were not going to work for me so i bought some 2200's..

blade7

I don't really have a power target, 400/400 would be nice, but as an example one of my favourite back roads has a few corners I have to drop down to 2nd for decent exit speed, being able to do that in 3rd instead would be nice.

odurandina

I'm kind of excited to see Jeff (in Austin, TX) building my old 3.0 motor and doing like, mid-boost.

curious to see what kind of shape the block is in, how much he has to do to it, and the costs.

curious to see how much fun he gets back for his hard earned dollars. ain't easy.




oh, and if anyone would like an almost new Sach's clutch and my cams, just shoot me a pm.

,

gpr8er

The difference in the powerband is well worth it. The 2.5 is like a light switch when it's making 300+hp. The 3.0L has the powerband of a V8. I used all the components you have. I'm making 375 @ 17psi and no lag with my VERY mild build. Rouge maf, stock intake, NA cam, 3" exhaust, LR65.

blown 944

Mine is obviously not the typical 3.0 build. However, ill say that the added stroke really transforms the way the car performs.

It's worth it IMO

blade7

Thanks for the replies. So if a 2.5 typically starts pulling around 3k where does a 3.0 wake up ?

Thom

A 3.0 using most of the stock parts (airbox, intake, cam) should not cost too much and make 400 ft.lbs at 3000 rpm if you wish so. It will be faster than your 300hp 2.5 but a deadly boring drive and run out of breathe above 5000 rpm.

You will need something like a Lindsey intake, a good camshaft (at least 9R cam) and a turbo at least as large as a LR65 to free up the top end and get the lively power delivery of a proper sports car (not some yank V8 that makes torque all over the place with no proportional power peak).

I did some mods to a friend's stock 2.5 recently and have worried myself at how frantic it now puts its power down, even if from the stopwatch it remains quite a bit slower than my 3.0 which feels safer going faster.

By the sound of it your engine and car are too sound to consider the investment.
Upgrade your exhaust to a full 3" unit and a good remap and you should feel happier already. In any case you will need a 3" exhaust for a proper 3L build so you could start from there.

odurandina

fify.

sooner. but I don't drive one so....

blade7

In the Sept issue of GT PORSCHE magazine there is an interesting article on an unrestricted 968 RS, no info about the engine spec but it does say it was much faster than a 911 turbo. Externally it looks like a 944 turbo inlet manifold and AFM are fitted.
I am growing a little weary of the power delivery on my car, hence my renewed interest for a 3.0.
A cheap 968 with a blown engine would have been a good base for a turbo conversion, but the wheels/mirrors/gearbox etc make crazy money so I've given up on finding one. Maybe in the short term I'll fit the turbo I have, a MAF kit and an exhaust on the 2.5 and see how it performs. I'd be a little surprised if the LR 61-10 ran out of breath at 5k on a 3.0 though.

ekoz

I've had my 3.0 for about a year. Not a daily driver Just a toy for de's. The 3.0 exhibits much less lag and I'm only running 15 psi boost. If I had to do it over ( my 2.5 engine blew up). I would go Sid's route. Use the 2.5 crank and a non interference engine ( I believe that is correct ).

My 3.0 is running without balance shafts and with the Lindsey ultra mounts for engine and trans i experience more cabin noise than before. Also my Sachs 6 puck clutch is a little hardener to get a smooth take off from first gear. My 2.5 was silky smooth with the stock mounts.

That being said. I just got back from the Porsche car show in St. Louis. I could buy a cayman or newer 911, but I enjoy knowing that I can still hang with most of these newer cars on the track. Compared to the modern electronics on these cars driving a 951 with no anti lock brakes or stability control is a handful. I think it forces you to be a better driver. I've been with guys in a cayman that turn and brake at high speeds and the whole time I'm thinking we are going to spin but the electronics kick in and save them.

I like to tinker too. And you really don't have as many options on a newer Porsche Call me old school but I like being able to open the hood and see a nice valve cover that says PORSCHE right on the engine. Unfortunately for my wife. I think she's stuck having a 951 in the garage for a long time. I truly believe modified 951 ownership is a sickness.