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-   911 Engine Rebuilding Forum (http://forums.pelicanparts.com/911-engine-rebuilding-forum/)
-   -   My 2.7l rebuild and tuning project (http://forums.pelicanparts.com/911-engine-rebuilding-forum/1075307-my-2-7l-rebuild-tuning-project.html)

CarreraEvo 11-01-2020 12:59 AM
Quote:
Originally Posted by brianjames1 (Post 11079700)
Great thread-
I have a 75 carerra roller in search of an engine. Thinking of buying a core 2.7
Thoughts on a newb with strong mech background doing a rebuild ?
The mag cases can be made to work, but if you don't have it already, I'd definitely get a 3.0 or later, if I were you.

Making the 2.7 mag work is a lot of work, and it'll never be as strong as a 3.0.

The reason I did mine was, that I already had the engine.

CarreraEvo 11-01-2020 01:02 AM
Quote:
Originally Posted by jpnovak (Post 11080740)
Your torque dip at 2100 rpm is likely too rich. your 1600/1900rpm columns have a large jump in delivered fuel. This is an artifact of tip-in fueling on take-off.

Now that you have a torque curve you need to rescale your fuel table to add an RPM column at 2200rpm. Take away (or average the 4500/5100) a higher rpm column where your torque is flat.

This will give you resolution to improve your tuning as you ramp in torque.

Also, scale your load rows to match your engines total vacuum. Shift rows to add more resolution between 85-100kPa to better match your ITBs. use a datalog to set your lowest row at MAP-min value and scale accordingly.
Thanks for your advice!
I'll get on to that asap - which is in 5 months, winter has arrived here :(
I was thinking of something like: 1300-1500-1800-2100-2500, where I remove 4500. 3900-5100 are fairly similar.
How how does that sound?

CarreraEvo 11-01-2020 01:03 AM
Quote:
Originally Posted by winders (Post 11080743)
What is the displacement of this engine? What headers did you use?
It's a 2.7 engine with 10.5 compression.
I'm using the stock '74 headers, which is the same as SSI, I think.

winders 11-01-2020 06:26 AM
Quote:
Originally Posted by CarreraEvo (Post 11084634)
It's a 2.7 engine with 10.5 compression.
I'm using the stock '74 headers, which is the same as SSI, I think.
So you are saying you are getting 271 HP at the wheels from this 2.7 build?

CarreraEvo 11-01-2020 10:29 AM
Quote:
Originally Posted by winders (Post 11084851)
So you are saying you are getting 271 HP at the wheels from this 2.7 build?
Not at the wheels - as I understand it the dyno meassures the transmission loss when it coasts down after the run. Once it’s down to about starting speed, it subtracts the losses and you get engine hp.

winders 11-01-2020 11:37 AM
271 HP at the crank is a little optimistic for that build especially at 7000 RPM. What correction factor did the dyno software apply?

CarreraEvo 11-02-2020 03:13 AM
Quote:
Originally Posted by winders (Post 11085283)
271 HP at the crank is a little optimistic for that build especially at 7000 RPM. What correction factor did the dyno software apply?
I don't have the dyno graph with me, but there is a "EOF k = -0.6%".
Other than that, I don't know.

But I tend to agree, 271HP is a lot - I was pleasently surprised :D

But in the end, it's just a number.

brianjames1 11-02-2020 12:47 PM
thanks
 
Quote:
Originally Posted by CarreraEvo (Post 11084632)
The mag cases can be made to work, but if you don't have it already, I'd definitely get a 3.0 or later, if I were you.

Making the 2.7 mag work is a lot of work, and it'll never be as strong as a 3.0.

The reason I did mine was, that I already had the engine.
Ill look for a 3.0 or 3.2 many thanks

gandeesinla 11-15-2020 07:18 AM
Congrats on your rebuild, very clean and incredible outcome. I have single TB 3.2 MS1 EFI setup on my rebuilt 3.0 but I want to go ITB and those ITBs seem to be the ticket for max flow. Can you describe the fabricating to make the filters fit the trumpets? Did you seal the plate to trumpet interface or use some sort of gasket? It looks really clean overall. -cheers

CarreraEvo 11-18-2020 01:12 PM
Quote:
Originally Posted by gandeesinla (Post 11103839)
Congrats on your rebuild, very clean and incredible outcome. I have single TB 3.2 MS1 EFI setup on my rebuilt 3.0 but I want to go ITB and those ITBs seem to be the ticket for max flow. Can you describe the fabricating to make the filters fit the trumpets? Did you seal the plate to trumpet interface or use some sort of gasket? It looks really clean overall. -cheers
Hi
The filters from Pipercross came with a bottom plate with no holes.
So I made 3 holes about 8mm larger in diameter than the trumpets. Then I used sliced silicone tubes as gaskets.
I installed 4 studs from each of the ITBs to keep the plate in place.
I’ll look for a photo.

CarreraEvo 11-18-2020 01:13 PM
Pic of filter platehttp://forums.pelicanparts.com/uploa...1605737755.jpg

Hcarraro 11-23-2020 05:02 PM
Nice work. Thanks for sharing.

Henry

Ginger77 03-17-2021 06:19 AM
Great build! I was wondering how you got the Bosch PWM idle air valve hooked up. The wires, I suppose, go to the MS as described in the manual. But how did you hook up the air hoses?

CarreraEvo 03-18-2021 09:51 AM
Quote:
Originally Posted by Ginger77 (Post 11262893)
Great build! I was wondering how you got the Bosch PWM idle air valve hooked up. The wires, I suppose, go to the MS as described in the manual. But how did you hook up the air hoses?
I’ll hook up the PC and look for in a bit 😀

Ginger77 03-19-2021 02:58 AM
I don't think the answer is in the PC unless you're looking for photos. I literally mean how did you hook up the mechanical side of the valve? Not the electrical wires.

http://i.imgur.com/SQPSj.jpg

The idle valve blows air but into where? I get the principal with a regular injection intake boot. But I don't see how it works with us using filter or stacks.

CarreraEvo 03-19-2021 08:14 AM
Quote:
Originally Posted by Ginger77 (Post 11265543)
I don't think the answer is in the PC unless you're looking for photos. I literally mean how did you hook up the mechanical side of the valve? Not the electrical wires.

http://i.imgur.com/SQPSj.jpg

The idle valve blows air but into where? I get the principal with a regular injection intake boot. But I don't see how it works with us using filter or stacks.
It was indeed photos I was looking for.

Basically I run a hose from each TB to a plenum, a single hose from the plenum to the idle valve and a single hose from idle valve to the right side air box.

Below are the two best photos I could find. It looks as if the hose from idle valve to air box is not fitted in the below photos.
If it doesn't make sense, I can snap some better photos for you?

http://forums.pelicanparts.com/uploa...1616170033.JPG
http://forums.pelicanparts.com/uploa...1616170033.JPG

BURN-BROS 03-19-2021 07:59 PM
Outstanding build! Peak HP @7k plus should net 100hp/liter. Looks like yours is healthy. If you can figure fuel lbs/hr for your build, you can verify the Dyno results. Also, if you can get the injector quantity per cycle, that would work as well.

Mark Ennis 03-21-2021 02:57 PM
Wiring Harness
 
Where did you source you wiring harness

CarreraEvo 03-21-2021 10:24 PM
Quote:
Originally Posted by Mark Ennis (Post 11268180)
Where did you source you wiring harness
I made it myself 😎

mikedsilva 03-22-2021 02:08 AM
Nice result, very impressive results.


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