Dakle situacija je sljedeća.
CA18DET, AFM je od skylinea 80mm, injektori su Nismo 555ccm.
Piggyback je e-manage koji ima u meniju podršku za drugi afm (odabereš koji imaš i on sam preračunava volažu i afm). Isto tako upišeš vrijednosti injektora before/after.
Screenshot menija u e-manage gdje se to radi
http://www.mohdparts.com/emanage/photos/profec_e-01_screen_shots/DSC06693.JPGE-manage ima upisanih 40-ak afm-ova tak da samo biraš koji imaš i on sam sve radi, cool!
E sad kad zbrojiš i oduzmeš sve to ispda da je najbolje upgreadti veći afm i injektore istovremeno.
Eto i objašnjenja zašto je to tako
Stock Z32(300ZX) MAF = 530 WHP
Stock SR(200SX) MAF = 260 WHP
so the Z-32 MAFS can flow 2.04 times as much air as the stock maf. this is great for High HP cars. so IN THEORY say your
is cruising down the road and you are making 50 hp under a light acceleration. Now airflow meters are not a linear response but have more of a exponential response. but for this example we will assume a linear response to make things easier...when you get into the exponential response you need to include a conversion function that is beyond the scope of this response...and in the end makes no difference in the final answer (thanks regis)...
So where were we? oh yeah 50 Hp...so by the conversion factor and assumed linear response above the SR maf would read .96 volts and the Z32 would read .47 volts. Now for your
to run correctly using the Z-32 and stock injectors the ECU needs to be seeing .96 volts. the S-AFC knows the response multiplier and multiplies the incoming MAF voltage (.47 from the Z-32) by 2.04 and sends out a .96 volt output to the ECU....and you drive down the road with no problem.
then you lay into full power...say for this example your
has 300 Hp capacity with it's ncie s-15 BB turbo, but stock injectors (good to 270ish WHP) you lay into it and at 260 Hp the stock MAF would max out (5.0 V) and this is what the ECU would need to see to make the
run right. the Z-32 would now be outputting 2.45 volts into the S-AFC. it multiplies by 2.04 and you get 5.0 Volts and your
shuts down. The ECU sees anything greater than 5.0V as a fault and shuts the system down until proper voltages are seen (maybe a grace window to 5.12V as stated earlier). So how did i run 380 HP on a S-AFC and a stock ECU??
Injector correction!!
so being smart and realizing you have 300 Hp on tap but only 270HP worth of injector you go out and buy new injectors. A bright Yellow new set of new Tomei 555cc Side feeds...life is good! you go back and do the calculation for baseline correction for the injectors.
(370/555) - 1 = correction factor = -33%
so you go in and set all your high and low throttle settings to -33%. and you go drive your
!! now in the real world the settign once tuned on a wideband would be much different due to ECU mapping...on my
with the described setup there were places where i was runnign -45% correction to get a desired 12.0:1 AFR...but that is irrelevant for a 300 HP
such as this example!!
so back on the highway light acceleration 50 Hp...for the
to run properly the injectors need to see 2/3 of the on time of the stock 370's at this power, and thus 2/3 of the expected original MAF voltage....if you dont understand this i can clarify in another post. so you would usually have .96v coming in...but were on the Z-32 so we have .47. the S-afc performs the airflow conversion of 2.04 and you have .96V. next the S-afc performs the programmed correction factor of -33% that you entered. so you have
0.96 - (0.96 * .33) = output to ECU = .64V
now as you can tell that is exacly 2/3 of the ORIGINAL (stock maf/injector) air flow that would have been needed to run the
. and you drive perfectly down the road..
then you come across that pesky mullett in the 5.slow Rustang and you decide to let the SR breathe and show this neaderthal who is king of the road. you wind your SR all the way out to it's full 300Hp potential and leave mulletore wondering what happened...but how did it work??
so you went all the way to 300 HP. on a stock MAF that would have been 5.77 volts..not possible. and as you know the ECU would have shut you down at 5.0 V anyway. but we have the Z-32 and we were runnign bigger injectors so here is what we had!! Z-32 output was 2.83 volts...Airflow meter corection is 2.04 and the Injector tuning had you at -33%. so our final voltage to the ECU was as follows..
2.83 * 2.04 = 5.77 (same as before)
now for injector correction
5.77 - (5.77 * .33) = final output to ECU = 3.87V
now as we discussed earlier this needs to be 2/3 of the original injector on time .... and it is very close (off by a few thousnaths of a volt). the ecu has no problem with a 3.87 Volt input and you are merrily going along leaving the mullet junky in the dirt!!
now...you get a good bonus at work and decide to upgrade the turbo!! you put on nice GT25R and you are now capable of 390 Hp (if only you could find that mustang again and really give him a lesson!!) so you go out there and stand on the gas!!. spool that baby upa nd right before redline the
shuts off. Agrhh...your frustration is un-paralleled by anything known to man!! why you ask yourself as you cruise back to the garage in low boost mode!! lets do the calcs!!
390 Hp on a Z-32 would produce 3.68V out of the MAF...it goes into the S-AFC
times 2.04 = 7.50V
Injector correction = -33% so
7.50 - (7.50 * .33) = final output to ECU = 5.02V
oops theres our problem the ECU shut us down again! its time for a re-program or bigger injectors....but at this point you are so far away fromt eh origianl power levels...i suggest just a reprogram.
Hopefully that clarifies any misconceptions about the S-afc and S-afc2!! and how they work!!
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E sad, pošto ja radim ovaj motor prvenstveno da bude POUZDAN, a tek onda da ima snagu, od ostalih djidja i igračaka sam ugradio u auto EGT, senzor je u ispušnoj grani prije turbine.
Senzori i ćukice
LM-1 WB 02
Zadnje, što sam nabavio je g-tech RR za mjerenje performansi.
Tu čitaj o preciznosti istih
http://www.caranddriver.com/article.asp?section_id=4&article_id=9380&page_number=6E sad, molim te znam da je "ona" turbina bolja od ove, da je "xyz" wbo2 bolji od ovog mojeg, da je VBOX preciniji od g-techa, ali molim imajte u vidu da nisam tuning firma nego individualac kojem ova oprema treba za povremeno korištenje.
Point is da mi pomognete maksimalno iskorisiti ONO ŠTO IMAM, a ne ono što postoji tamo negdje u dalekom japanu. :kinez:
Any ideas? Osim klasike, max out i onda klasični lean-out proces.
Mislim da je prava sreća da imam ovaj piggyback, tako da imam jako dobru base mapu koju ću poslije samo ispeglati.
[Edited on 26-1-2006 by ZaX]
