Breaking the Silence

[Carolina Dyno]

Originally Posted by hmong337

The perfirmance of the DI delete. And observations you have made on the deletion as compared to keeping it?

Honestly we probably won't have any further updates because we won't have anything to compare to. We will never have DI back on our car so until a customer chooses to do a before/after test when they install it on their car the results I've already provided are likely to be all there is.

We will continue to run without DI as long as we have the car so we will put testing and miles on it but won't have any kind of side by side comparison of what it would do with DI in the same conditions.

From what I've seen and tested I just can't see any reason to run it. No one has shown anything remotely impressive as far as power/liter that tells me there is any advantage and all of our personal testing showed it was a net loss. That's all the reason I need to take that headache out of a race car.

[mrk1]

I would be interested to see the results of no DI. Running just the ports would certainly simplify a standalone ecu choice.

[Carolina Dyno]

Originally Posted by mrk1

I would be interested to see the results of no DI. Running just the ports would certainly simplify a standalone ecu choice.

If you want to test a set and provide your results including logs & dyno or trap speed results I'll send you a free set. I've seen you post on various forums and know you would provide a proper analysis if you were interested.

[Nigelr32]

I am going DI delete on my engine, which will have Carillo rods, custom CP pistons and a dry sump strapped to it.


The combustion chambers are being welded up and reshaped. We just need to decide what to do around the squish area and what design to go with for piston crown?


I'm looking for a little advice if there's any out there?? I look forward to my PM box being filled by Carolina Dyno??

[Carolina Dyno]

Originally Posted by Nigelr32

I am going DI delete on my engine, which will have Carillo rods, custom CP pistons and a dry sump strapped to it.


The combustion chambers are being welded up and reshaped. We just need to decide what to do around the squish area and what design to go with for piston crown?


I'm looking for a little advice if there's any out there?? I look forward to my PM box being filled by Carolina Dyno??

What is your power goal? Naturally aspirated or FI? What kind of racing will you do with it?

Ditching the DI puts you back into a world that has been fully developed. CP knows what a piston needs to look like for any PI application and any decent cylinder head shop should know what to do with the heads. You're not reinventing the wheel so the answer should be pretty cut and dry based on your intended use of the motor.

[Nigelr32]

Originally Posted by Carolina Dyno

What is your power goal? Naturally aspirated or FI? What kind of racing will you do with it?

Ditching the DI puts you back into a world that has been fully developed. CP knows what a piston needs to look like for any PI application and any decent cylinder head shop should know what to do with the heads. You're not reinventing the wheel so the answer should be pretty cut and dry based on your intended use of the motor.

Hi, I will be going for something around the 500 whp level. I will be going to CP pistons and am having the head work done by Race Developments here in the UK. He knows exactly what to do and has been reshaping CC's all his working life?


I really look forward to the results..

[Nigelr32]

Well, I've made the bungs and had them welded in. The inlet seats are now being replaced as they "may" have moved, so better safe than sorry.


Pistons are on order from CP without that horrible triangular hollow and no sharp edges.


Re-profiling of the combustion chambers is next on the list then we're done. I think I may be the first to do this eh??

[Ashikabi]

Originally Posted by Nigelr32

Well, I've made the bungs and had them welded in. The inlet seats are now being replaced as they "may" have moved, so better safe than sorry.


Pistons are on order from CP without that horrible triangular hollow and no sharp edges.


Re-profiling of the combustion chambers is next on the list then we're done. I think I may be the first to do this eh??

I'm all for new ideas and stuff but wouldn't it have been easier and cheaper to just swap an EJ25? I'd very much like to see before and after power numbers if possible

[pleong]

One of my DI's crapped out on me the other night when we were tuning. This is when we started thinking about deleting it as well. I'm not a tuner and don't have much knowledge or experience in tuning. But with the help of Steve Kan at PRT Performance, we built my motor.

After clogging or blowing one of my DI's we started thinking about this. Just don't really know how it would affect the engine and the performance. Steve suggested that we set the overlap to 100 (don't even know what that means). I would love to hear more about this from you @Carolina_Dyno

In the mean time, I'm going to replace all 4 DI's just so i can have her back up and running. Haven't felt the power of my car in a long time. Steve thinks maybe the paper element from the fuel filter might have clogged it up. We did an ohm test on the bad injector and a new injector and they both read the same. We powered up the old injector and it was pulsing and a bit of fuel came out too. We were kind of stumped on what happened, but we went ahead and replaced it with the new one anyways. Steve feels the car still doesn't feel the same, so I'm replacing the other 3 today. But again, would love to speak to you more about how you're deleting the DI's!!

Just FYI on my build:
11.5:1 CP Pistons
Carrillo Rods
FBM Stage 2 head with Stage 1 cams
FBM Turbo Kit (Modified)
custom intercooler and routing
3" DP and straight pipes
ID1300
PTE5858
Aeromotive FPR
E85 lines and fittings
Integrated Engineering Surge tank with a Bosch 044 pump inside
Walbro 485 pump in the oem hanger
Return fuel system
Running strictly E85
*Installing a fuel lab 75 micron fuel filter after the surge tank today*

We put out 522 whp on a dyno dynamics on the stock motor and 452 on our mustang dyno

We're still finishing up the tune after we get the new DI's in this wknd. We did 404whp on 17psi on the mustang dyno before the DI crapped out

[pleong]

ok just read thru the thread (even all the bickering) guess i won't be deleting it anytime soon.. don't feel like rebuilding this motor again LOL but I definitely would love to hear more regardless! and about other things yall are working on

[Nigelr32]

Originally Posted by Ashikabi

I'm all for new ideas and stuff but wouldn't it have been easier and cheaper to just swap an EJ25? I'd very much like to see before and after power numbers if possible

Everyone swaps the engine out for something or other. I want to build my FA20 to see what it can do. You should congratulate me for having the balls, ( or stupidity)? to do this!!

[Nigelr32]

So, if we're gonna do this, we best do it right. Make it like there were never any holes for DI in the first place and also get pistons made by CP without the DI recess.


First things first, plugging the holes..

I turned up these to press into the head and sit at the bottom of the chamfer so they look cool. The long thin shaft is a nice snug fit in the injector bore.


From the outside..





Here we are from inside..





Welded up, polished back and new seats fitted and cut. The heads have also been skimmed.





All this work is done by Race Developments in Gloucester. Tim really knows what he's doing with all this stuff!!

[mrk1]

Holy Legit!

[Tim Radley]

And here is the finished article ready for you to collect. A shame we didn't weld the ports up but hey ho.
The new non-DI pistons might be with me before Christmas with luck