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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 05-11-2007, 05:11 PM   #21
Ben
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The 1.6 FM link default is for RCEng 440 high z injectors. If you raise offest to ~85 and lower master fuel to ~75% you have a good, safe base map for RX7 550 high z injectors.

The offset and master fuel are multipliers to the zone fuel. You also have CLT and IAT as additional modifiers. It's important to have the correct quantity of fuel per condition, and is less so important how the fuel gets there. IE if your master is slightly low but your zone values are a little high, it's a wash.



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Old 05-11-2007, 05:17 PM   #22
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Yeah- I linked the 1.8 550cc turbo'd defaults.

I went to 88 offset w/85 master fuel and was told I still didn't have enough offset. My row 100 numbers are all over the 200 for the car to run right. But there's got to be some other indicator than that- no?
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Old 05-11-2007, 05:43 PM   #23
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Yeah, but my point is, it doesn't matter. You already have a pretty solid tune that you've been working on for a while now. If you lengthen your offset now, you're going to add fuel everywhere. The % difference will be greater in lower rows than in higher rows, but still, you're going to add fuel across the board. Fuel that you spent so long trimming and removing already.

If it's running through the 100s and hitting disired a/fs, and it's running through 200s and hitting disired a/fs, why mess with things?

Also, you're running the 1.6 link right? It was premapped with 1.6 fueling needs in mind. your 2.0L is going to drink more gas than a 1.6, that's the nature of the beast. You could have kept the master fuel lower and raised each zone cell individually, but it's far more efficient to raise the master if you have to do an overall raise.

I know I'm not the Link tuning expert, but again, don't fix what ain't broke. 3 x 4 x 5 = 60 = 4 x 3 x 5

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Old 05-11-2007, 05:47 PM   #24
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Master fuel is for all zones, while injector offset is only for 100 and 200 primarily. That could make a significant difference. If you use injector offset to compensate you'll be lean in boost I would suspect. L3 modifies MF for short term fuel trim.

From what I found on the subject over on m.net, you need to play with injector offset more to get your zf2xx higher than zf1xx.

How did you come to your MF and InjOffset numbers? I left MF at 100 and used injector offset to make it idle nice. Then I went back and lowered MF till I got to the difference between the 440 and 460 (~95). Once I had that sorted out I adusted idle to get it resonable.

I've only done a bit of coarse tuning so far and haven't yet done any datalogging. So I'm not sure if on average my 100 is lower than my 200. Jeremy said not to really put a real fine point on that and just get it close, coarse tune, then populate row 100 with 200. And bump up zf100 till it idled well.
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Old 05-11-2007, 05:53 PM   #25
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That's what I thought. And wasn't going to screw with it unless there was a good reason. I thought the offset was high enough at 88, but after tuning it wasn't.

Yes, I can take your lecture professor when you're speaking common sense.

The car idles good now with the AIC messing up anyway.

My primary concerns are the IGN map and fuel around peak torque. Might have to sneak out tonight with this adjusted map.

Jay- I just picked up the number from others that had settled around 80. I'd brought it up to 88, but after some tuning my z1xx numbers still rose over the 2xx. I agree- coarse tune and then adjust manually. Same goes for boost- datalog and adjust manually. I only did a few autotune boosted runs for a basic coarse tune and then relied on the WB02 after that.

I think I'll make my first run on whatever I've settled at tonight. Then bump up the timing overall and make another run looking for knock.

Last edited by m2cupcar; 05-11-2007 at 05:58 PM. Reason: add response to jay
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