Aurora 4.0l / Izuzu 5 speed swap into 88 coupe (Page 98/102)
Will JUN 22, 08:05 PM

quote
Originally posted by cptsnoopy:

The line installed... (getting to that coupler above the steering shaft dust boot is crazy hard!)



I know you know you can pull the bucket out of the front compartment to make that job cake...
cptsnoopy JUN 22, 09:28 PM

quote
Originally posted by Will:


I know you know you can pull the bucket out of the front compartment to make that job cake...


Yes, except some dummy ran their positive battery wire conduit through a hole they made in the bucket.
Then after considering the things I could do to get the bucket free of the conduit I also realized I'd have to take several if not all the extra bolts out for the front battery box. The good news is that the new line is working. The bad news is that I think I bent the insides of the new v-5 compressor and probably need a new one. Oooops! It still cools but it is horribly noisy now...

Charlie
cptsnoopy JUN 22, 11:26 PM
Here are the changes I made to the fuel map. There are a couple things to note. When I received the base map from chrfab it was for a normal N* (I just assume a L-36 vin 9) It had a max rpm of 6300. I put in the springs and retainers from chrfab so I changed the rpm range from 700-6300 to 700-7500. The rpm axis is populated as follows for resolution in the more commonly driven rpms...

700-800-900-1000-1100-1300-1500-1700-1900-2000-2100-2200-2300-2400-2500-2600-2700-2850-3000-3250-3500-3750-4000-4250-4500-5000-5500-6000-6500-7000-7500

In theory and probably in use, this is a better way than having even spacing like below

600-830-1060-1290-1520-1750-1980-2210-2440-2670-2900-3130-3360-3590-3820-4050-4280-4510-4740-4970-5200-5430-5660-5890-6120-6350-6580-6810-7040-7270-7500

The advantage of using higher resolution in the commonly driven areas is to have the ability to obtain a finer tune and improve drive-ability for street use.

The disadvantage for the guy working the fuel map is that you cannot use the tools included to fill in gaps between cells that you know are good. Lets say you have a value at 1500 rpm and a value at 2100 rpm that you like and you want to simply fill in the values between them with even spacing. That works fine if the rpm numbers are evenly spaced as in the second example but if they are like I have them in the first example the values will fill in the blocks evenly but the rpm values are not equal so the values are off. Using the above example of numbers between 1500 and 2100 rpm. I have 200 rpm spacing from 1500 to 1900 rpm then 100 rpm spacing from 1900-2100 rpm. If the value at 1500 rpm is 20 and the value at 2100 is 26 then the computer will fill the three remaining blocks with equal (linear) numbers in the cells 1700-1900-2000. so the whole line from 1500 to 2100 would look like 20-21.5-23-24.5-26 The problem is that I am looking for the same amount of increase per rpm increase so I have to take the difference between cells 1500-2100 which is 6 and divide that by 600 (2100-1500=600) to get the actual amount of increase per rpm. Then I multiply that by the number of rpm increase per the particular cell I am trying to populate. So, the the cells from 1500-2100 should look like 20-22-24-25-26 as the resolution changes. Unfortunately the software is not written to do this for you. It only counts the number of cells between end points selected and fills them in with equal values.

The reason for trying to explain the above is to help you understand why it took nearly 16 hours to change the fuel map from the original to the new (using the "self learning" feature for reference points) when it would have only taken a couple of hours if I had not changed resolution in different rpm (and TPS) areas of the map. I am hoping this was worth the time as I am still quite a ways from having it tuned correctly.

Charlie


Here is the fuel map that is a couple of iterations from what chrfab sent me. The current learn values have distorted the map and are colored green. The original map is blue. I then started working on it to capture the "highs" and "lows" of the learned reference points and the map came out radically different. So different I thought it would not likely run but to my surprise it actually ran noticeably better.


Here is the fuel map about 1/4 of the way through the transition process. I think I had spent over 4 hours on it by this point. Here you can see how radically the lower end of the map (low TPS values) have been leaned out. This might partly be from changing to Alpha-N from Speed-Density but I am guessing I would have done something similar using Speed-Density too.


Here is the final rough draft before trying it.


Here is the fuel map after the first tuning drive on it. It has more work to be done but it looks like I went in the right direction.

[This message has been edited by cptsnoopy (edited 07-05-2015).]

cptsnoopy JUL 03, 09:32 PM
It was a little cooler out earlier this morning so Myra and I took the Fiero out for a trip to the store and 6 miles of freeway driving. This was to enjoy the car as well as getting the coolant and oil circulated through the engine... With the Alpha-N tuning and the revised fuel map along with the learning the car has done since the one drive after revising the fuel map, I have to say, it's running just awesomely! After it was fully warmed up we did a couple of 3rd gear pulls from 60 to 80mph just to feel the power and listen to the sweet music that engine makes! It really is a pleasure to drive. I doubt it will beat any of the newer generation of muscle cars but it certainly is much more powerful than a stock Fiero. We are looking forward to cooler temps in the fall and getting out on the road to enjoy the car more. The one thing I really noticed is that the off idle stumble is gone.

Charlie
cptsnoopy AUG 20, 12:10 AM
I was getting a little frustrated trying to keep the a/f balance between the front and rear cylinder banks even using the wbo2 sensors. The front bank was rich at idle and would go lean at higher rpms compared to the rear cylinders. I played with it for awhile and tried sniffing for vacuum leaks but did not come up with anything definitive. So, I switched back to the stock intake manifold which surprisingly went in without too much modification. At first the idea was to get it together enough to test and see what the idle a/f ratio was between the front and rear cylinders. Once that was done, I fired it up and surprise, they were equal, right at 14.7. Given that, I modified the CAI to get filtered air to the throttle body and installed the IAT sensor. Hopefully it'll be ready for some road testing in a day or two.

Charlie
cptsnoopy AUG 20, 01:28 PM
Pictures!

This is the stock manifold in place for a test run.


This is the screen shot of the engine idling. Note the a/f mixtures match!


I cut off the mounting end of the MAF housing and used it as a flange to clamp the 3.5" tubing to. Also mounted the IAT sensor in the tubing, hope it holds up ok...


One of the main reasons for using the ITB setup (besides it looking so cool) was to avoid having to modify the shifter cables for the air intake. Here you can see its a tight but manageable fit...


Getting closer. Needs cleaning up. The throttle cable has to be modified to work. The fuel vapor canister and brake booster vacuum lines need to be connected. Should be good to go after that.


Charlie
cptsnoopy SEP 11, 11:01 AM
I had to solder on a GM TPS connector but other than that it was pretty straightforward getting the stock manifold swapped in.

Here it is in its final form. One wire bundle was too short to route around the intake manifold so it had to cross over the top...



And, here is the new RetroSound Newport radio, looks authentic but has late model technology such as USB and bluetooth. does not play CD's or cassettes though.



Charlie
cptsnoopy SEP 29, 01:05 PM
I can't say how bad the front upper a-arm alignment system is on an 88. really a pos in my book... But, after noticing that the left front wheel was not in alignment, I set about getting it right. as usual, if I set the caster and camber correctly, then tightened the bolts, the teeth in the cross shaft would just slide back into the original grooves causing the camber to move negative again. grrrr. So, i moved the caster and camber beyond what was needed and tried for the fourth time to tighten down the bolts and this time it was enough to make new grooves in the metal. Yay! The caster and camber are within limits although not perfect. The caster is slightly more positive than the right and the camber is slightly more positive also. The good news is that those settings appear to be correct for cross-caster and cross-camber. I reset the toe and the car handles sooooo much better! Life is good again.
I am not getting great gas mileage atm. To much pushing on the gas peddle I suspect... That issue I can work on slowly...

Charlie
Will SEP 29, 09:02 PM

quote
Originally posted by cptsnoopy:

I can't say how bad the front upper a-arm alignment system is on an 88. really a pos in my book... But, after noticing that the left front wheel was not in alignment, I set about getting it right. as usual, if I set the caster and camber correctly, then tightened the bolts, the teeth in the cross shaft would just slide back into the original grooves causing the camber to move negative again. grrrr. So, i moved the caster and camber beyond what was needed and tried for the fourth time to tighten down the bolts and this time it was enough to make new grooves in the metal. Yay! The caster and camber are within limits although not perfect. The caster is slightly more positive than the right and the camber is slightly more positive also. The good news is that those settings appear to be correct for cross-caster and cross-camber. I reset the toe and the car handles sooooo much better! Life is good again.
I am not getting great gas mileage atm. To much pushing on the gas peddle I suspect... That issue I can work on slowly...

Charlie




http://www.realfierotech.co...opic.php?f=3&t=17936



I've been told that WCF is or has tooled up to produce those.

[This message has been edited by Will (edited 03-01-2019).]

cptsnoopy SEP 30, 12:28 AM
That would be a huge improvement!

Charlie