Silver Comet

iTrader: (12)

Okay, I've recently just finished my car and have outfitted it with an Rtek 2.1 ECU and am currently boosting at 9psi on stock timing. I noticed a little feature that I was curious about "Boost Based Timing" when should someone have this engaged? The car is an S4 TII 720/550 Injectors, Fmic, Ported turbo, ect. all supporting mods. Could someone tell me if I need this checked off or not. Thanks for you're help

Silver Comet

iTrader: (12)

Oh I got it! Never mind people, I'm stupid. The ECU in it's stock timing maps are Load vs RPM and can be switched to a boost based timing map. Derp

Nick_d_TII

iTrader: (6)

Don't use the stock/factory Boost based map! you have to input the entire maps (leading and trailing or split)

Silver Comet

iTrader: (12)

Gotcha! I appreciate the warning!

rex7tuner

iTrader: (3)

theres a good write up with samples of boost based timing maps! search for it, im gonna be using it wen i get my car out here in california!

Silver Comet

iTrader: (12)

Yea I've been checking out Rotary Rocket's Load Based Timing corrections which basically simulates what is used in Rtek 1.7 and Arghx Boost Based Timing spreadsheet's it's very interesting. I understanding how timing works, but I don't think I'd be able to make my own set-up's so it's a little frightening. Tuning fuel shouldn't be a problem though to hit my 12psi goal on stock turbo.

Silver Comet

iTrader: (12)

I would like to direct another question in this thread, how do you know if Boost Based Timing or Load Based Timing is better for you? I can see the details of both in this thread: https://www.rx7club.com/rtek-forum-1...timing-941044/
I'll sit and put in values as long as I have to to get the best engine performance so that isn't an issue. I'd just like to know what is better? Thanks

These are the details of my engine set-up specifically:
Stock S4 TII motor (8.5:1 Compression Ratio)
Greddy FMIC
550/720cc injectors
FD Fuel Pump
S5 Turbo Charger
Stock S4 AFM
Freeflowing Exhaust
HKS Intake
Oil pressure, Boost, and AFR Gauges

lastphaseofthis

iTrader: (8)

Again I AM NOT RESPONSIBLE FOR ANYTHING THAT HAPPENS FROM YOU USING THESE MAPS.

RotaryRocket88

iTrader: (7)

If you're using a stock turbo, you're probably better off with a modified load-based map or MAP based timing with more advance at high RPM. The stock turbo just runs out of breath up top, and Mazda's maps run a lot of advance to get a bit more power there: https://www.rx7club.com/2nd-generati...ck-ecu-943159/

I used the load-based timing for a few years, but switched to MAP-based when I changed turbos.

Silver Comet

iTrader: (12)

Thanks for the tip man, I'm going to go implement your modified map and start some fuel tuning. Thanks again!

Wms10th

iTrader: (2)

Make sure your PDA has a good charge, it takes a long time and is very tedious.

I'm still doing fuel tuning now that my engine has more miles(1800) on it, but getting near the end. I made a few adjustments to the timing map at low end to help drivability and off idle response.