STS setups

[ZL1Killa]

I ordered me my STS kit, racetronix plug and play fuel system kit from thunderracing

2 bar map sensor
and at running 5lbs of boost will I max out the MAF?

also does anyone have knowledge of injector tuning?
the 60# motron injectors which i'm getting, does anyone know of them setting codes or anything like that? do you change the IFR and leave them alone?

[onfire]

1. If you're going to keep the maf (I would at 5psi), you don't need a 2 bar map...stock is fine.

2. 5psi will not max the maf.

3. Set the ifr for 60# Mototrons per the spreadsheeet listed on here.

4. Tune the car on a wideband/dyno and tweak the rpm vs PE for a stable 11.8:1 af ratio.

5. All your ltrims should be a negative number that is -14 or less...if not you'll need to do the auto VE tune or fudge the IFR's whichever you prefer...most prefer AutoVE.

6. Enjoy.

[redhardsupra]

1. If you're going to keep the maf (I would at 5psi), you don't need a 2 bar map...stock is fine.

2. 5psi will not max the maf.

3. Set the ifr for 60# Mototrons per the spreadsheeet listed on here.

4. Tune the car on a wideband/dyno and tweak the rpm vs PE for a stable 11.8:1 af ratio.

5. All your ltrims should be a negative number that is -14 or less...if not you'll need to do the auto VE tune or fudge the IFR's whichever you prefer...most prefer AutoVE.

6. Enjoy.

2. yes it will, easily, i got logs to prove it. go 2barSD and AutoVE slowly, deeper and deeper into boost areas.
3. use the spreadsheet, works great
5. do NOT tweak IFR for any other purpose but adjusting for new injectors/fuel pressure/fuel pressure regulator

watch what rpm boost comes on, and adjust your PE triggers accordingly. remember that in turbos torque/compression hits early(before 3000rpm), so the NA config is very dangerous for it, as in NA configs, peak torque happens past 4400rpm. log gently, adjust accordingly.

[onfire]

2. yes it will, easily, i got logs to prove it. go 2barSD and AutoVE slowly, deeper and deeper into boost areas.
3. use the spreadsheet, works great
5. do NOT tweak IFR for any other purpose but adjusting for new injectors/fuel pressure/fuel pressure regulator

watch what rpm boost comes on, and adjust your PE triggers accordingly. remember that in turbos torque/compression hits early(before 3000rpm), so the NA config is very dangerous for it, as in NA configs, peak torque happens past 4400rpm. log gently, adjust accordingly.

Interesting. I have logs with the maf set at 512g/s that's fine on the dyno until 550ish rwhp. Then it clips the maf and it's PE vs RPM only. 5psi sts set-up generally don't hit 500rwhp. I'm controlling 16.5psi and plus 700rwhp with a stock 1bar map and stock screened maf.

What rpm did your maf clip at 5psi?

What rwhp did your maf clip at 5psi?

Was the maf extended to 512g/s ?

TIA.

[redhardsupra]

this is the best chart i have handy



look at the graph, this is what happns to a NA (1bar) computer, when you throw a basic 5psi STS kit on it. MAP flatlines. MAF flatlines. so everything that's based off these two is plain wrong at that point. considering that MAP ran out at like 3200rpm and MAF at 5200rpm, this is not a good setup to do any 'tuning' with as two important sensors are completely lying to you.

[onfire]

Your maf flatlined since it's only set to 439g/s.....it should be extended to 512g/s which will get you around 67lbs of air....which will get you around 650 engine hp...which a base 5psi sts kit will not get unless it can break the laws of physics

1bar will always max over ambient pressure...103.7kpa hits at wot.

12000 hertz and 512g/s should get you there. If not, nothings better than a great sd tune.

Nice info redhardsupra.

[redhardsupra]

it was configured to what i could figure out at the time (narrowbands and 1bar MAP). i wasn't gonna set MAF to arbitrary values just because it fits my purpose. besides, i think this was in SD, and MAF was just monitored, but ignored, look at dynamic airflow on the chart (i dont know why the table is out of sync), it's more telling of the real performance. considering that our cars make about 9-10hp per 1lb/min of airflow, that makes it a much happier HP number, and we still got over 1000rpm to go
i've seen almost as high numbers on very nice NA setups, so i'm still not impressed with it peak wise, but powerband-wise, STS is awesome. if you wanna keep your stock gears, dont wanna shift too much, or just own an automatic with lazy spaced out gears, STS is really well fitting.

anyway, the point here is that any FI maxes out NA-oriented PCM. for MAF it will outflow the MAF, which you cannot calibrate correctly, because to first get a good handle on VE, you'd have to calibrate, which is not fully possible, because your calcuations are thrown off with a 1 bar MAP. you're screwed either way, so just bite the bullet and get the 2 bar MAP and put in custom OS.
if you got any good logs to share/dispute me, i'd be delighted to see them

[onfire]

LABELS MAF Sensor Calibration (Grams/Second)
Hz {link: GM.MAFFREQ} Value
1500 2.460938
1625 2.859375
1750 3.289063
1875 3.765625
2000 4.296875
2125 4.890625
2250 5.539063
2375 6.250000
2500 7.023438
2625 7.867188
2750 8.773438
2875 9.726563
3000 10.734375
3125 11.812500
3250 12.976563
3375 14.218750
3500 15.562500
3625 16.992188
3750 18.515625
3875 20.148438
4000 21.898438
4125 23.773438
4250 25.781250
4375 27.898438
4500 30.101563
4625 32.367188
4750 34.710938
4875 37.164063
5000 39.718750
5125 42.382813
5250 45.187500
5375 48.125000
5500 51.195313
5625 54.476563
5750 58.023438
5875 61.773438
6000 65.710938
6125 69.851563
6250 74.101563
6375 78.523438
6500 83.101563
6625 87.796875
6750 92.710938
6875 97.812500
7000 103.156250
7125 108.773438
7250 114.570313
7375 120.570313
7500 126.757813
7625 133.140625
7750 139.703125
7875 146.390625
8000 153.273438
8125 160.257813
8250 167.515625
8375 174.945313
8500 182.648438
8625 190.585938
8750 198.765625
8875 207.195313
9000 215.890625
9125 224.859375
9250 234.109375
9375 243.640625
9500 253.484375
9625 263.625000
9750 274.093750
9875 284.890625
10000 296.031250
10125 307.515625
10250 319.367188
10375 331.593750
10500 344.195313
10625 357.195313
10750 370.601563
10875 384.429688
11000 398.679688
11125 413.367188
11250 428.515625
11375 445.000000
11500 468.000000
11625 480.000000
11750 495.000000
11875 510.000000
12000 511.000000

[ZL1Killa]

thanks for all the replies guys. Marcin, nice to hear from ya again.

also some people say go with an 85m maf to get a little more airflow values...or change the values as above... IDK, i got the 2 bar map sensor on order and it should be here this week. So i could keep it just in case... or sell it or whatever... we will see. Nick Williams is going to be doing the major tuning for me, i got a tune made now that is extreme safe.. just haven't changed the upper MAF values nor some other minor stuff, figured as long as i can drive it at highway speeds, no racing or nothing I will be fine

[ZL1Killa]

i also see in your log what your getting at Marcin..... that log you showed is showing 11260Hz and 439 G/s flow..... well you still got to get to 12kHz and 512 g/s. I do see what you are talking about and that it does happen and maxes out and sensors start lying.... hell i got my VE tuned in mostly so I could go OL and avoid all the BS with codes triggering for 02's and crap