With my very big streetported s5 TII Motor, I find that It doesn't Idle nicely at the 750 rpm former sweet spot. I have It Idling at 1000 rpms and It's holding up well. This Involves my Microtech LT8 and the lack of a BAC Valve.

It's no surprise It doesn't Idle at 750 rpms anymore, but I'd like to see anyone elses experiences.

 

750 RPM....but at 20* BTDC.

Large Mazdees SP.

 

I'll probably be able to get It down lower (If any), I just need to familiarze myself more with the manual and It's functions.

IAN was telling me how you had the white smoke start problem, as I currently have, that you later smoothed out. He also pointed out that you have the Wolf, me with the Microtech and Ian with the Haltech.

 

Well, the smoke is from the pre-mix. Don't listen to Ian, he's just a noob

Well, my car won't idle at 750 unless I advance the idle timing. At stock timing 5*ATDC, it won't really idle under 1000 rpms either, at least with my current idle fuel maps.

Aparently though, Mazda recommends 20 BTDC leading at idle for the race engines...and it does work for me.

PS: Too bad we all have different EMS's lol. Can't really help each other there.

 

My car idles at around 900RPM with a Microtech LT8. Doesn't has a street port though.

 

Sr, my car idles at 950 with 14 dg advance, and sits at 10-12 "inhg depending on the day, once you start to break it in, you will be able to pull the idle down somewhat and pull some fuel out...Mine goes into closed loop at idle, and settle out around 13.5:1 on the wideband after awhile...as mine got worn in, I started pulling out fuel and advance...sucks not having a bac valve though, that would get old for me real quick...max

 

I'm premixing myself. Oh, with Ian, I get that Impression on him myself. J/K

As for the timing, I've remarked my Crank Pulley 5mm to the right of the Yellow mark. Hence, I marked the Pulley to zero timing. If you use the 5 ATDC while your Microtech Is set at 0, you will be 5 degrees off.


I maybe rushing things but a couple variables as to why I really shouldn't be concerned with lowering the Idle just yet. For one, I have a fresh rebuild. Infact, I've got only 250kms on It right now. Start ups are getting better now. I merely have to tap the Throttle Pedal to start It up whereas before - I had to hold It down for 4-5 seconds! The most Inportant reason Is I have a big *** streetport (this coupled with the above) equates to a lumpy Idle below 1000rpm. I won't concern myself to much, as for lowering the Idle. I need to start taking fuel out asap. I'm barely getting 200kms of each fillup!

But I'd like to see others with their streetport and Idle.

 

Yeah, I'd like to have my BAC as well.

But really, the Wolf v3 can't do crap with it anyway. So I'm stuck with no cold idle until the car warms up

 

Even If I put the BAC Valve back on, I'd have to send the LT8 back to Microtech. Apparently, It's not programmed to work under default.

 

I idle at 1100 rpms. It just seems to be the smoothest there.

 

Stock timing at that idle...or 'custom'?

 

1FastT2, pretty high, eh? I'd Imagine you tried lowering It and messing with your Fuel (Idle) Maps.

Where Is you upcoming website?

 

My TII has Pineapple Racing Stage 2 streetport.

I idle it at 700rpm @ 390mmHg vacuum. It idles smoothest w/ the most retard possible on the Haltech.

11# flywheel, low comp '87 rotors, 3mm seals, 720cc primary inj, 3.5" turbo back (idles a little smoother w/ tip silencer in).

Rob builds a tight engine, it started RIGHT up!

 

700 rpm? I didn't think you could get It that low and maintain It. This Is the Porting I got.

 

mine idles smooth around 650-700 depending on weather
thats w/ streetport and stock computer. timing is set at the marks and I have no BAC
pulls around 12-14 inhg

still needs a little tuning, I'm gonna try to get it up to about 750-800

 

I can't really tell from that pic how long the port is..
Here is the primary form Rx7_turbo2's engine, mine is similar, but a bit longer top and bottom...

 

Secondary....

 

We arent to sure yet how this will Idle.........

 

Mine will hold onto about a 500 rpm idle, although it starts to shake the car pretty good.. I like to keep it smoothed out, and keep the vacuum up so my brakes still have some assist to them...
Blue TII:... YOu mean you have no bars on the ignition map showing at idle, zero advance? are you sure your Cas is stabbed right? or are you way into the advance?...
Edit:
Evilrotor, I seem to remember that the wolf can use the ford Iac motor for idle control, maybe you need to see if you can find one of these from a rustang or something in the wreckers to see if it works or not...Max

 

I am idling at 850-900 with a large street port, and LT-8. The motor has about 350miles on it, and idles nice and smooth. I have been pulling fuel out of the idle map, and it keeps getting better and better with age. I also have no bac.

 

Blue TII:... YOu mean you have no bars on the ignition map showing at idle, zero advance? are you sure your Cas is stabbed right? or are you way into the advance?...

Yep. It is normal for streetports to idle smoother w/ very retarded ignition at idle.

The CAS was definitely stabbed right and checked w/ timing light on pulley- before and after the ignition amps and aftermarket coils were added.

 

My car idles around 650 at startup temp, but after it warms up it idles around 780-880- not very smooth since its ported so large.. but hey, it idles

 

1000 rpms, pulling 16 vac

 

Ummm, actually, that is completly the reverse of being true, with the more overlap the ports have, the less low speed chamber pressure is produced, the more ignition advance that is needed to maintain an idle, if your car will idle with no advance on the haltech map, something is not right, or your motor is running stock porting, it is not normal at all, compare your numbers to everyone else that is posting here...something isn't right with your setup, in fact even my motor when stock wouldn't idle without some advance....Max

 

Max, something I noticed with the LT8 - When I made an attempt to adjust my timing, I forgot to lock It Into the Handcontroller. I noticed I couldn't line up the mark to the pin for crap. Was that the LT8 counteracting my adjustments to suit the LT8 settings? Nonetheless, I haven't made an attempt until later on this day. I'll know than.