3.0 CIS System Complete 1983 Whats it worth

[Rawknees'Turbo]

Originally Posted by 1979-930

Damn straight!!




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The shadow in this pic confirms that Deez really is a d***head!!!

[pmax]

Originally Posted by Rawknees'Turbo

The shadow in this pic confirms that Deez really is a d***head!!!

LOL
thread delivers.

[1979-930]

It was high noon and the 930 makes me happy!


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[Matt Monson]

Ready for some rear boosting, so to speak.

[Rawknees'Turbo]

Originally Posted by Matt Monson

Ready for some rear boosting, so to speak.

I miss the dangling Dane.

[nathanbs]

Originally Posted by juanbenae

plus, they look cool as balls. when has anyone ever said that about a motor topped with a CIS system that didn't include an inner cooler?

to remain on topic I got $400 in late 2016 per my notes for a BP system that "worked when removed". did I mention packing it for shipping even partially disassembled was a tall field to mow?...

I feel the same way about the turbos. The intercooler kills the way the engine bay looks Sorry Raw

[nathanbs]

Originally Posted by Matt Monson

It’s more than just a butt dyno. A set of Webers, without changing cams or pistons, will increase the power of an SC lump by 10%. Just that and a set of SSIs make an SC that can pull on a 3.2 Carrera and it’s FI.

I had the first set-up that you describe and three different mechanics explained that nothing could be done for the horrible flat spot above 4800(approx) minimally without changing cams. Butt dyno it was considerably slower than a stock Carrera 3.0

[juanbenae]

Originally Posted by nathanbs

I had the first set-up that you describe and three different mechanics explained that nothing could be done for the horrible flat spot above 4800(approx) minimally without changing cams. Butt dyno it was considerably slower than a stock Carrera 3.0

beauty is you get to 4800 RPM much quicker! the stock Carrera 3.oL had the euro, higher compression pistons though which could explain the better acceleration than a US 3.oL. in my experience the CIS SC US 3.ol does not make a ton more power after 5K RPM as it is flattening out above that mark anyway

[Matt Monson]

Originally Posted by nathanbs

I had the first set-up that you describe and three different mechanics explained that nothing could be done for the horrible flat spot above 4800(approx) minimally without changing cams. Butt dyno it was considerably slower than a stock Carrera 3.0

Absolutely true. It's way better than it was, but not as good as it can be. Depending on how you go about it, one can get another 40hp out of changing both the cams and pistons on a rebuild. If you toss the emissions and fuel economy constraints out of the way, you can put together a 250hp 3l with no driveability issues all day long. My race customers get another 100hp beyond that out of them! The 3l is amazingly detuned in as delivered form.

[Matt Monson]

Originally Posted by juanbenae

beauty is you get to 4800 RPM much quicker! the stock Carrera 3.oL had the euro, higher compression pistons though which could explain the better acceleration than a US 3.oL. in my experience the CIS SC US 3.ol does not make a ton more power after 5K RPM as it is flattening out above that mark anyway

Early CIS cams are a little more aggressive too. Webers and SSI on a 74 911S engine can run nose to nose with Webers and SSI on a small port SC engine.

[Rawknees'Turbo]

Originally Posted by nathanbs

I feel the same way about the turbos. The intercooler kills the way the engine bay looks Sorry Raw

False - it makes the engine bay look like it is housing an engine that actually has enough power to get out of its own way!

[pmax]

Yeah, 250hp, of course
https://www.youtube.com/watch?v=bhuOiYjE0pg

but what about butt dyno upgrades even a DIYer caveman can make to the prehistoric systems ?

[nathanbs]

I just put 46 Webers on an 3.0 SC with 9.5:1 pistons and 464/465 web cams, stock distributor with MSD coils and 1 5/8” headers with dansk sport muffler. First jetting was so rich that it was only 145 hp, second attempt after changing mostly everything jet and choke wise was 221hp. Still a bit on the rich side. I know that we should be able to get at least 20 more hp but I didn’t want to spend another week or two ordering parts and re-dyno’ng. Car runs great and I’m selling it so I figure with out knowing what altitude the car will end up I drew the line.

[juanbenae]

Originally Posted by nathanbs

I just put 46 Webers on an 3.0 SC with 9.5:1 pistons and 464/465 web cams, stock distributor with MSD coils and 1 5/8” headers with dansk sport muffler. First jetting was so rich that it was only 145 hp, second attempt after changing mostly everything jet and choke wise was 221hp. Still a bit on the rich side. I know that we should be able to get at least 20 more hp but I didn’t want to spend another week or two ordering parts and re-dyno’ng. Car runs great and I’m selling it so I figure with out knowing what altitude the car will end up I drew the line.

with the hotter cams in my motor I could not get the rich condition dialed out after weeks of swapping jets, ET and AC. the true break thru was when reading paul's site that with the hotter cams a single out muffler would make it tuff. when I scrapped the 2/1 for a 2/2 muffler it made a significant difference. leaned the top end out nicely, yet I remain rich on the idle circuit no matter what I do.


ive learned to live with it and feel im not doing any harm as the plugs look very good when removed for inspection. at freeway cruz im getting mid 12 AF to low 13's and with power applied ive got it to about the same 12-13AF with no limp spots in in transition.


there is a limp spot in the driver's seat, but that's another story entirely...

[nathanbs]

Originally Posted by juanbenae

with the hotter cams in my motor I could not get the rich condition dialed out after weeks of swapping jets, ET and AC. the true break thru was when reading paul's site that with the hotter cams a single out muffler would make it tuff. when I scrapped the 2/1 for a 2/2 muffler it made a significant difference. leaned the top end out nicely, yet I remain rich on the idle circuit no matter what I do.


ive learned to live with it and feel im not doing any harm as the plugs look very good when removed for inspection. at freeway cruz im getting mid 12 AF to low 13's and with power applied ive got it to about the same 12-13AF with no limp spots in in transition.


there is a limp spot in the driver's seat, but that's another story entirely...

Lol nice. My muffler is 2/2 so I think just need to tweak it a bit more.

[Rawknees'Turbo]

Originally Posted by juanbenae

. . . with no limp spots in in transition.


there is a limp spot in the driver's seat, but that's another story entirely...

Maybe this will help you out (highly recommended for cavemen carb guys, so I hear!)?!

[juanbenae]

what emulsion tubes are you running?

in addition to the 2/2 helping by referencing this chart I moved to an F8 emulsion tubes that also helped in leaning it out some across both circuits. took my at idle numbers from low 10's, to stuck on 10 because it was richer than the AF meter would read at idle to high 10's, low 11's when at full running temp.





this chart with the info contained in the one above will show the hole diagrams in various ET that I found interesting in better understanding them. in addition to hole location and lay out the center bore diameter and exterior thickness are very influential in mixture.

[juanbenae]

Originally Posted by Rawknees'Turbo

Maybe this will help you out (highly recommended for cavemen carb guys, so I hear!)?!

im not treating my sweety to any of those raw... she'd come to expect such enhancement in performance that I simply don't have the motivation to provide day in & day out...

[Rawknees'Turbo]

^^^

One thing's for sure, based on his pic above, Deez does NOT need the Blue Bombers!!!

Originally Posted by juanbenae

. . . I found interesting in better understanding . . . hole location . . .

???

!!!

[CBA]

Juan,

What is your motor and carb setup? I’m sure I hunt through the forum but since you here.....