LS4 / F40 swap - fieroguru (Page 202/216)
fieroguru OCT 05, 08:29 AM
More driving...
I did switch out my tuning laptop several weeks back and got around to making a new stand for it. It is larger and taller than the previous one:
Sage OCT 05, 08:57 AM
That......is NEXT LEVEL!

HAGO!
fieroguru OCT 13, 10:28 PM

quote
Originally posted by Sage:
That......is NEXT LEVEL!

HAGO!



Thanks Tedd!

Doing some WOT tuning...
With the light wastegate spring and the boost reference routed to the base of the diaphragm on the wastegate (not to the dome) I am getting about 5.2 psi boost above 6000 rpm. When I had the boost ref line disconnected, I saw over 14 psi, so fully closed on the manual boost knob is 5 psi and if I open it up I should be able to get 14+ psi when the time comes...

Insta-boost really describes this combo.
Starting at 2025 rpm in 3rd gear, by the time the throttle is at 96% I see over 101kpa, so boost starts when the pedal hits the floor.

From 100% throttle @ 2287 rpm:
1 psi boost is 0.33 seconds and at 2403 rpm
2 psi boost is 0.82 seconds and at 2582 rpm
3 psi boost is 1.20 seconds and at 2757 rpm
4 psi boost is 5.46 seconds and at 4583 rpm (Boost averaged 3.77 psi between the last two settings - so this is likely the true wastegate setting and then boost creep kicks in.
5 psi boost is 8.82 seconds and at 6049 rpm (boost averaged 4.5 psi between the last two, so this is more uniform boost creep).

Still have some tuning on the A/F ratio to address the tip in lean spike and flatten the WOT portion. I might install an even lighter spring so I can tune the 105-120 KPA range in the upper rpms, but winter is coming. The Fiero is in the garage for the next several days as the lows will be in the 30s. Maybe next weekend I can do some more tuning runs

Not sure I believe it, but the delivered torque calculated by the ecm is 337 lb-ft at 100% throttle at 2282 rpm and peaks at 495 lb-ft at 6300 rpm. When the car was NA, RWTQ at 2000 rpm was about 268 and peaked at 335 close to 5000 rpm.



The car is a blast!
fieroguru OCT 19, 10:53 PM
Did another 3rd gear WOT and ran it up to about 6900 rpm (120 mph).

A/F is targeting 11.2 and timing is 13.5.
Boost creep in the upper rpms is keeping torque nearly flat and HP climbing.
The next pull I might start increasing the base boost.
pmbrunelle OCT 20, 12:44 AM

quote
Originally posted by fieroguru:
Not sure I believe it, but the delivered torque calculated by the ecm is 337 lb-ft at 100% throttle at 2282 rpm and peaks at 495 lb-ft at 6300 rpm.



Probably estimating torque/power with the mass of the car, a drag guesstimate, and acceleration would be a way to cross-check what the ECM is saying.
fieroguru NOV 10, 08:23 PM
Car was parked for about 3 weeks while I was waiting for some nice weather.

During that time I was cleaning the garage, purging some old things, and putting more parts into labeled boxes for longer term storage. With the Fiero and Sara's Murano in the garage, my work area will be limited to the 3rd bay, and it was a disaster after a very active summer.

Over the winter, I will be switching out the 2DIN head unit and moving 2 more gauges above the instrument cluster. I doubt this is the final version, but it will be used for mockup to fine tune the final one.






While playing with the plasma, I went ahead and knocked out the Christmas gifts for Sara's co-workers at the University of Illinois (Graduate Engineering Online Programs - so she now works in a building I took engineering classes in almost 30 years ago). One of her co-workers is always making 3D printed stuff, so Sara wanted some CNC Plasma stuff for her co-workers.

We will paint these and apply some colored plastic to the back side so the I and names will stand out.


Today was above 60 degrees, so I got the car out and did about 5 WOT runs for the purpose of figuring out the manual boost knob boost settings. I was trying to find the setting for 8 psi. First test was 1/2 turn out, but made little change, so the rest were full turns out. Each one wasn't a full pull as I just wanted to see the boost increase. 4 full turns started about 5.5 psi and creeped to about 7.5 and I did run this one out (which is the graph below). The fueling is pretty much spot on now with the wideband, so I am going to start playing with the low rpm high load timing bumping it slightly while keeping the boosted timing at 14 degrees.

I plan to do a few more runs on Monday. Now that things are getting more dialed in, I might do a 1st - 3rd WOT run to see how long it takes to reach 120+ mph, and how much tire spin get in 1st and 2nd.


zkhennings NOV 11, 01:39 PM
Holy S*** to those numbers and that flat torque curve for 4000rpms.
Trinten NOV 12, 01:00 AM
Nice!!

Your car is knocking on the door of 700 HP at the crank?? That's awesome!! And I agree with zkhennings, fantastic "torque plateau"!

Rock on!
fieroguru NOV 12, 07:10 AM

quote
Originally posted by zkhennings:
Holy S*** to those numbers and that flat torque curve for 4000rpms.




quote
Originally posted by Trinten:
Nice!!

Your car is knocking on the door of 700 HP at the crank?? That's awesome!! And I agree with zkhennings, fantastic "torque plateau"!

Rock on!



Thanks guys! These are the ecm calculated numbers for flywheel torque (used in the factory torque management. They are probably +/- 15%, but are mainly used to see the power band and evaluate impact of tune changes.

Since I planned to run non-intercooled from the beginning, I switched to a better intake, had the heads CNC ported, and went with a slightly smaller duration/higher lift camshaft (Tick Stage 2 Turbo camshaft for the 4.8/5.3L engines, 219/223 .617/.595 LSA114+3). All in an effort to maximize airflow through the engine so I could make more power per psi of boost than the older setup would have. Sure I could just turn up the boost to overcome flow restrictions, but that generates more heat for a given HP level.

Yesterday I did a few more runs.
The WOT run in 1st, I was trying to avoid tire spin and rolling into the throttle. Didn't get over 65% throttle, built about 2.5 psi of boost, before hitting the rev limiter...
The WOT run in 2nd was better, but I still need to work on shifting.

Peak tq from yesterday was 602 ft-lbs.
Peak hp from yesterday was 764 hp.
Peak boost was 7.6 psi.
zkhennings NOV 15, 01:14 PM
Head flow is almost more important for FI compared to NA, when my WRX motor blew up I got a JDM motor to replace it (from a twin turbo legacy B4), the intake port sizes were massive compared to the stock WRX intake ports. With the stock motor I was seeing loads at 19-20psi of boost around 2.25grams/revolution, I turned the boost down to 15psi when tuning the timing tables for the new motor and I was hitting 2.4g/rev with way less boost. Don't think I am going to turn the boost up as high as it used to be, and enjoy my lower intake temps, a couple extra degrees of timing, and more power.

[This message has been edited by zkhennings (edited 11-15-2024).]