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 Post subject: tuning dw injectors
PostPosted: Wed Jun 08, 2011 1:45 pm 
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Newbie

Joined: Fri Jul 24, 2009 12:42 am
Posts: 6
Hi,

I have trouble to tune my side feed dw 740cc.

the minimum flowing injector is 734 but now on my scalar I'm at 780cc on romeraider.

I have the stock intake with the stock maf setting
and a perrin turbo inlet.

Something wrong?

Thank you


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 Post subject: Re: tuning dw injectors
PostPosted: Wed Jun 08, 2011 1:54 pm 
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Experienced

Joined: Mon Oct 06, 2008 8:05 pm
Posts: 616
Location: Broomfield, CO
How are you scaling the injector?

A WOT pull should give you the proper scaling, while idling should give you the proper latency, since you already know the MAF. You might have to make some small adjustments to the MAF scaling afterward, but you should be able to get close with the injector scaling and latency.


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 Post subject: Re: tuning dw injectors
PostPosted: Wed Jun 08, 2011 2:22 pm 
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Newbie

Joined: Fri Jul 24, 2009 12:42 am
Posts: 6
My latency is .80 at 14 v vs stock .67

my learning is under 5 %

I tried 734 but at wot I was rich. Now at 780 I'm really close to my target.

but people seems to use stock latency and set the scalar around 740 with this injectors...


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 Post subject: Re: tuning dw injectors
PostPosted: Wed Jun 08, 2011 2:43 pm 
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Experienced

Joined: Mon Oct 06, 2008 8:05 pm
Posts: 616
Location: Broomfield, CO
What are you logging the WOT AFR from, and where is it installed? Are you sure it's reading correctly? Have you cleaned your MAF recently? Are you sure you don't have any boost leaks?

If everything checks out, I'd just go with a 780 scalar and call it a day. Every car is different, it's possible your FPR has a quirk that keeps you a little above 43 psi base, or your MAF reads higher than normal, etc.


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 Post subject: Re: tuning dw injectors
PostPosted: Wed Jun 08, 2011 2:55 pm 
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Newbie

Joined: Fri Jul 24, 2009 12:42 am
Posts: 6
Ok I will look at this . maf, boost leak, etc.

I have a lc-1 in the down pipe.

also at idle my lc-1 read 14.3 and the o2 sensor read 14.7...


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 Post subject: Re: tuning dw injectors
PostPosted: Wed Jun 08, 2011 3:02 pm 
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Experienced

Joined: Mon Oct 06, 2008 8:05 pm
Posts: 616
Location: Broomfield, CO
14.3 vs 14.7 could be a problem with either of the sensors. You made sure your AFR Learning D range was 0 during those WOT pulls when you were scaling the injectors, right? Anything other than 0 will throw off the result. It might even help to force the car into open loop while doing this, then re-enabling closed loop once you get everything scaled properly.


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 Post subject: Re: tuning dw injectors
PostPosted: Thu Jun 09, 2011 5:49 pm 
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RomRaider Developer

Joined: Wed May 20, 2009 9:49 pm
Posts: 4467
Location: Canada eh!
I also am running 780 for mine with slightly higher than OEM latency.
Clean air filter, new last year front O2 and the WBO2 matches it.
My AF corrections are within +/-2% in all four ranges.


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