Turbo 325

[zwill23]

Had a feeling you'd be on a Haltec, I've been considering one for a while now. Was building an engine harness for the M20 fairly straightforward? I've always imagined the Haltec guys being very helpful with specific wiring questions.

[Panici]

Port work looks good! Nice challenge to open up an older 12v head for flow.
Don't see someone putting in the work too often with a boosted motor. But of course an engine that flows more N/A will have better spool and response when boosted.

Car sounds great and scoots pretty well. Personally I'd be happy at your power levels rather then going for E85.
There is enough to knock the tires off based on your video, which is basically my benchmark for fun lol.

I'm also just not a fan of ethanol in general. I mourned the loss of E0 gasoline around here.
Left sitting it pulls in water from the air, rusts fuel tanks, plugs injectors. And it's even worse on something with carbs.

[bangn]

I did consider it and initially I wasn't really convinced It was worth the extra money however just looking into again I see its also got onboard wideband controller. They're 500$ on their own. The WB1 I have currently would be fine to put with the SR with the 2000. So I guess the R3 might be go instead. The R5 is a beast but its a lot of $

[e30davie]

I assume you have considered the R3 or R5? The PDM features would really clean up some of my wiring....the price jump from elite2500 to R3 isn't too many $$.....

[bangn]

Running haltech elite 2000, in a bit of fork in the road tho and may end up putting an elite 2500 in so I can have drive by wire and then putting this 2000 in the soon to be sr20 e30 323.

Gate is absolutely marvellous but its so loud I do have to be in those rural areas to properly open it up. Too many dobbers with dashcams in Australia

[zwill23]

This makes me want to plumb my wastegate, it really does sound great. What kind of management are you using?

[e30davie]

Damn thats got some go to it.

[litu]

Wow that sound so good

[bangn]

so here is the idle

https://www.youtube.com/shorts/j6rvpzK5gB8

couple of 2nd/3rd gear pulls to the speed limit

https://www.youtube.com/watch?v=lid1Ap62Xew

[bangn]

Here is the AMC intake port after cleanup

[bangn]

heres an example of an intake port cleaned up on the 885 head I had, nothing serious just took out the ridge lines

[bangn]

Without a flow bench its pretty risky to do anything major so I err on the side of caution there. Id recommend watching as many videos as you can from Headgames and David Vizard as their knowledge is extensive
and will aid you in making decisions on what to touch and not to touch. On the 885 head its especially risky to make changes as you can make them worse than oem however I feel you can remove casting ridges and smooth out transitions carefully without detriment to the port design itself.. AMC head needs a fair bit more cleaning up than the 885 head

ie below - this is an intake port on the AMC head and as you can see the injector relief is more of a wall, its also not even central.
I port matched where the red arrows were as this genuine gasket was exactly the right size as the 885 intake port. Only a small amount of material to remove
Now where the square is took a fair bit of time as the roof was so low the injector couldn't get a good firing line at the valve. I raised this up so the roof was a clean sweep from left to right.
This reflected the design of the oem which was what I was trying to get close to. I then had to make my own injector relief which was very painful to match between each port.

I was fortunate enough to have an 885 head to compare my work to and the most important thing is to make small changes and do those small changes on each port as you go. Don't finish a port and
then start the port next to it from scratch, that's the sure way to have ports different. I also used a dremel on a snake, material removal was slow but very accurate. Die grinders very fast and its very easy
to start chasing your tail trying to fix fkups.




as you can see below here how bad the AMC head can be. Each port is different.


The green circle - throat. Leave it alone as this needs to be a percentage of the valve size, if using larger valves leave the head machinist to size it. Luckily on the AMC head the throat size
was exactly the same as the throat size on the 885 head which was only slightly enlarged by the machinist.
The red lines are areas I would smooth out to the bowl shape but then retexture it to the finish of the port - rough is good, smooth is bad (applies to intake only)


Exhaust side was much easier than the intake as it just needed the cleanup around the bowl area and a casting line from the mold. After this I went around the combustion chamber and took the hard edges out of everything so there is less risk for hot spotting

I still feel where the AMC shines after its been cleaned up is how the port is a bit more tapered towards the valve guide rather than straight on either side from the start of the port through to the valve seat, this should be beneficial to better velocity.

[McGyver]

Do you have any specifics on your porting process?

I've got a refreshed 885 head that is ready for a 2.7i build. It'd be nice to get it flowing as best as possible before assembling the enigne.

[bangn]

That's really unexpected for the AMC head to flow better than an 885. Do you think it all comes down to the time you spent porting it?

Yeh I don't think a standard AMC head would of achieved what this did, out of the box they suck!


So car is finally home, here is a teaser below
https://www.youtube.com/watch?v=pTA4eUehUy8 - dyno run on low boost 14psi

For now high boost is turned off until the fueling issue is resolved, as mentioned earlier the wiring to the pump is insufficient so will need to be changed. Also
found the return line is undersized (likely at the tank) as this is creating a pressure spike when coming off high boost and throws the ecu into limp mode. Its just factory sizing but we're now pushing the maximum capacity
with that pump. Going to need a big think on the direction I want to head at this point. Flex fuel is what Id like but its not as easy as changing fuel lines, need a larger pump and the waste
gate will be too small for it (need a 50mm instead of a 40). Likely going to have to modify the factory cradle to accommodate all this as the factory plug connector is also undersized.

As you can see the latest sheet below is where we are at for now, after 400 it was just becoming too unsafe and tuning could not go further. But to compare the second sheet marked in orange is the tune it had on the 885 head on this engine with 7psi of boost
until the engine was properly broken in. The response with the new modified AMC is a lot better, power is near on instant.

Weekend is meant to be sunny so il see If I can squeeze in a video of a pull and the idle, its very spicy even on low boost



Marked in orange - same engine but AMC modded head fitted instead of 885 @ only 7psi - still using 1mm oversize valves and same multiangle job performed with port cleanup

[McGyver]

That's really unexpected for the AMC head to flow better than an 885. Do you think it all comes down to the time you spent porting it?