Duffy's 1/71 Series 1 240z build

[duffymahoney]

1 hour ago, conedodger said:

Duffy, are you using the Haltech Can Bus? I have a local dealer. Though I doubt he stocks anything. Are you going to have to order this from OZ? 

I bought the WB2. They updated the plugs and u shouldn’t have to de-pin it to get the plugs through the body. Which will be nice. 

[duffymahoney]

I am using a mid 80s bmw iac valve. I was having a hard time finding a hose that looked good and would hold the vac without collapsing. Then it dawned on me, maybe one meant for the same bmw. Fits awesome and is exactly the right size for my balance bar. Stoked 

[duffymahoney]

Well Tons if fiddling and swear words. I now have 100% throttle engagement from the gas pedal. Turns out prior I only had like 70%. I normally work from the engine bay and I could always get 100% from there. Whoops

[duffymahoney]

I ended up getting new injectors. These are 35lb and they have a traditional 20 degree cone spray pattern. Prior I have a v pattern designed for DOHC motors. Squirting at two valves. Hopefully the work a little better. They are slightly longer. But I got them to work. 

[conedodger]

What Kind of A:F ratio are you getting under load with the 35# injectors. I don’t remember the equation off the top of my head but it seems you would need twice that?

[duffymahoney]

9 hours ago, conedodger said:

What Kind of A:F ratio are you getting under load with the 35# injectors. I don’t remember the equation off the top of my head but it seems you would need twice that?

Whatever AF mixture I want. 35lbs can go up to like 500+ hp. Which I will never achieve. 

[conedodger]

You are correct. My mistake. It’s my throttle body that calculates to 70mm. My own injectors are 42#.
 

*I bear no responsibility for mistaken judgement on days I get up at 3am to take one of our visiting kids to the airport… LOL!

Edited May 26, 2022 by conedodger

[Blitzed]

Hi Duffy,

Running 347cc EV14 Bosch, 1/2" height. My throttles are smaller, moved the fuel pressure reg setting to 45lbs unvacuumed. Sends a nice quick mist into the chamber. 

Agree my throttles are rated up to 70HP each, will never achieve the max HP x6 rating N/A. Believe part of the problem with ITB's, folks are over fueling these engines with big bodies and large injectors. 

Car is going to the tuner, taken it as far as my knowledge base. Self tuning beautifully but tuning decel is whole other animal. The lean spots at shift points and decay at decel is tricky with the distance of the injector to the valve. 

[duffymahoney]

ITB with IAC take 3. My last bmw IAC wouldn’t play nice with my haltech (basically it’s the opposite of how haltech controls it). This one let’s by a tiny bit of air at full closed. I plan to see if I can set the butterfly’s and it to play nicely and not idle too high when the engine is warmed up. Fingers crossed.

[Blitzed]

Hi Duffy.

How did the IAC workout? Where did you purchase? brand? My set-up is currently void of a IAV. 

Spent the large dollars for a professional tune. Passes up to 7,000 RPM. Was surprised ITB's without a IAC require a ton of ignition advance on the low end, close to 30 but required to eliminate the stumble when you stab the accelerator. 

Idling high now 900-1000 RPM but running strong. 

Who are you working with at Haltech? CA office or other location?

[duffymahoney]

Still finalizing it all.  Currently won't start, so I am trying to figure that out.  The iac is just a bosch.  

[duffymahoney]

Finally getting somewhere with iac and cold starts.