Lambda reading
10 July 2006, 12:39 PM
#4
I’m guessing here but……….the scale on the right is the average voltage output of the lambda sensor ie 0.2v = Lean, 1.2v = Rich. Your readout shows it leaner at the lower revs, a fairly steep climb between 3200 and 4000 (which I’m guessing is where boost really starts to kick in), and a nice steady rich reading at the higher revs. If you were to have any negative spikes anywhere along that line I’d say it was probably a bad reading. – But yours looks good (methinks).
If you can be arsed to read it, this should tell you some more about lambda sensors…..
http://www.picotech.com/auto/lambda_sensor.html
I’m going to be checking mine soon.
HTH
If you can be arsed to read it, this should tell you some more about lambda sensors…..
http://www.picotech.com/auto/lambda_sensor.html
I’m going to be checking mine soon.
HTH
10 July 2006, 12:49 PM
#5
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I think lambda = 1 means stoich, which is an AFR of 14.7:1
So lambda of 0.8 is 80% of stoich, as in 14.7 x 0.8 = 11.8:1
Your graph shows 0.7 = 10.3:1, which means a nice safe AFR when on boost
I stand to be corrected though, but thats how I see it
So lambda of 0.8 is 80% of stoich, as in 14.7 x 0.8 = 11.8:1
Your graph shows 0.7 = 10.3:1, which means a nice safe AFR when on boost
I stand to be corrected though, but thats how I see it
Last edited by Jay m A; 10 July 2006 at 12:52 PM.
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11 July 2006, 10:54 AM
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i think on the road youll find that the lambda reading would be closer to 0.78 as described above, on the rollers though the strange loads help to bring that figure down slightly lower....
I think my graph read around 0.72 or 0.73 on the dyno.
I think my graph read around 0.72 or 0.73 on the dyno.
11 July 2006, 11:07 PM
#10
Originally Posted by Scott.T
They do tend to read a bit richer on the rollers.
One of the factors being that the boost achieved on the rollers is normally a little lower.
what's your spec now then Granby, to get 333BHP ?
One of the factors being that the boost achieved on the rollers is normally a little lower.
what's your spec now then Granby, to get 333BHP ?
Last edited by Granby; 11 August 2006 at 12:19 PM.
12 July 2006, 12:09 PM
#14
Originally Posted by Scott.T
Does it still spit flames, as it was when I was behind you at brands in Keiths Classic Wagon.
Are they real or is it a flamer kit ??
Are they real or is it a flamer kit ??
but they aren't real 
, just opened up the plug gap on it recently and it seems to be flaming some more 
, think i scared a few people in Blackwall tunnel 
last Saturday coming back from the rolling road day
12 July 2006, 03:17 PM
#15
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Originally Posted by Granby
Better to run a little rich than lean
OK here we go with the full spec
VF34 turbo
Wrapped & ported headers (Harvey Smith)
Full decat
STi intercooler
STi injectors
Remap by Bob Rawle
Giving me a total of 333bhp & 325lbs
OK here we go with the full spec
VF34 turbo
Wrapped & ported headers (Harvey Smith)
Full decat
STi intercooler
STi injectors
Remap by Bob Rawle
Giving me a total of 333bhp & 325lbs
....http://img.photobucket.com/albums/v683/ns04/cc60eb74.jpg
Ns04
12 July 2006, 04:04 PM
#17
12 July 2006, 04:09 PM
#18
Originally Posted by trails
ian, i keep forgetting to ask what the VF34 is like compared to the old TD04...do you notice any more lag or has that all been sorted by Mr Rawl?
when it does kick in, now with the ported headers and the remap it almost spools up like the TD04 , you could always try one of Andy Forrests hybrid TD04's which are good for about 330bhp 
12 July 2006, 04:12 PM
#19
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Originally Posted by Granby
The VF34 spools up later than the TD04 but you get a bigger hit when it does kick in, now with the ported headers and the remap it almost spools up like the TD04 , you could always try one of Andy Forrests hybrid TD04's which are good for about 330bhp
when it does kick in, now with the ported headers and the remap it almost spools up like the TD04 , you could always try one of Andy Forrests hybrid TD04's which are good for about 330bhp
12 July 2006, 04:14 PM
#20
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Originally Posted by trails
ian, i keep forgetting to ask what the VF34 is like compared to the old TD04...do you notice any more lag or has that all been sorted by Mr Rawl?
I hope Ian will excuse me for jumping in with a reply, I have a VF35 (very similar to the VF34). In terms of the threshold at which the boost kicks in, it's like a TD04 before you get a decat etc i.e. it really starts to go from about 3000rpm (this is with ported headers though) at that point I have the torque I used to have at peak with the Td04 and from there it never looks back! The response below 3000 rpm is better than the TD04 after the remap and it feels beefier! In terms of the lag, i.e. the delay in response to the throttle being pressed, its not really discernably different TBH- it spools quickly. It punches considerably harder and longer though.
Ns04
Last edited by New_scooby_04; 12 July 2006 at 04:18 PM.
12 July 2006, 04:16 PM
#21
Originally Posted by trails
its the only thing thats making me drag my heals at present, my car almost feels like its NA at the mo which is lovely to drive but bad on the juice consumption...330 pah <petulant child voice> I WANT AT LEAST 350
12 July 2006, 04:19 PM
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Originally Posted by New_scooby_04
Hi mate,
I hope Ian will excuse me for jumping in with a reply, I have a VF35 (very similar to the VF34). In terms of the threshold at which the boost kicks in, it's like a TD04 before you get a decat etc i.e. it really starts to go from about 3000rpm (this is with ported headers though). That said, the response below 3000 rpm is better than the TD04 after the remap and it feels beefier! In terms of the lag, i.e. the delay in response to the throttle being pressed, its not really discernably different TBH- it spools quickly. It punches considerably harder and longer though.
Ns04
I hope Ian will excuse me for jumping in with a reply, I have a VF35 (very similar to the VF34). In terms of the threshold at which the boost kicks in, it's like a TD04 before you get a decat etc i.e. it really starts to go from about 3000rpm (this is with ported headers though). That said, the response below 3000 rpm is better than the TD04 after the remap and it feels beefier! In terms of the lag, i.e. the delay in response to the throttle being pressed, its not really discernably different TBH- it spools quickly. It punches considerably harder and longer though.
Ns04
ian (another one!)
12 July 2006, 04:20 PM
#25
12 July 2006, 04:21 PM
#26
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Originally Posted by trails
its the only thing thats making me drag my heals at present, my car almost feels like its NA at the mo which is lovely to drive but bad on the juice consumption...330 pah <petulant child voice> I WANT AT LEAST 350
Ns04
*For the moment!
12 July 2006, 04:25 PM
#27
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Originally Posted by trails
thnkas ns04, i also have harvey's headers so not a problem there...sounds as though a VF35 is the way to go...i'll also be upgrading to one of harvey fmic's so i expect quite a change in the way it drives
ian (another one!)
ian (another one!)
Ns04
(only joking