Dyno chart from yesterday.
06-13-2004, 08:18 PM
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Dyno chart from yesterday.
Here is my chart of run 9 and 10.I seems like 951 dont like to be hot cause I lost about 10 hp and 10 tq when i would run with out letting the car cool down.This was at 1.15 bar and about 11.5 A/F ratio average.
06-13-2004, 08:44 PM
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I have no clue.I was trying to get it out of there but It seems to have something to do with the turbo or wastegate. I think cause its right after full boost it might be overshooting boost and bleeding off .
06-13-2004, 09:48 PM
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Great chart! I wonder if the EBC got a spike and bled some off. Does the dyno have a way to chart boost or did you notice anything on the gauges?
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06-13-2004, 09:54 PM
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doober is right, your injectors cant keep up. thats whats causing the curve to decline that much (that doesnt explain the drop at 4300 tho, WG probly)
I think it's great to see more people posting dyno charts. BTW where is Cherry hill. I would love to take a look at that beast.
06-14-2004, 05:15 PM
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Bigger injectors.Not the problem the injectors can flow over 500Hp I am still a hundred plus short.I thought that myself before and people told me my 55 were to big.
06-14-2004, 05:23 PM
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I am going to tighten up the spring pressure on my BOV and see what I can do with my wastegate.I forgot to look at boost pressure to see if I saw a jump I was to busy looking at A/F ratio's and RPM's I am still a rookie, its so weird doing 140MPH on a Dyno scare's the #@%# out of you.
06-15-2004, 05:36 AM
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From the looks of your chart I'd say you were having boost spike issues. I have seen it before on the dyno - on the street everything is fine & dandy (boost wise) then you put her on the dyno and bingo -- overboost. Especially with the AVCR. My experience is that the AVCR needs to be set (duty cycle) a little more conservatively for dyno runs, initially at least. Ie set the duty cycle so the boost rolls on a bit more gently than normal. Watch your boost for the first dyno runs and adjust the AVCR duty cycle accordingly. I also get the operator to watch the AFR and I watch the boost & rpm myself. This way you should be able to avoid the spikes. Boost spike aside the dyno runs look good.
06-15-2004, 05:22 PM
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Originally posted by OZ951
From the looks of your chart I'd say you were having boost spike issues. I have seen it before on the dyno - on the street everything is fine & dandy (boost wise) then you put her on the dyno and bingo -- overboost. Especially with the AVCR. My experience is that the AVCR needs to be set (duty cycle) a little more conservatively for dyno runs, initially at least. Ie set the duty cycle so the boost rolls on a bit more gently than normal. Watch your boost for the first dyno runs and adjust the AVCR duty cycle accordingly. I also get the operator to watch the AFR and I watch the boost & rpm myself. This way you should be able to avoid the spikes. Boost spike aside the dyno runs look good.
From the looks of your chart I'd say you were having boost spike issues. I have seen it before on the dyno - on the street everything is fine & dandy (boost wise) then you put her on the dyno and bingo -- overboost. Especially with the AVCR. My experience is that the AVCR needs to be set (duty cycle) a little more conservatively for dyno runs, initially at least. Ie set the duty cycle so the boost rolls on a bit more gently than normal. Watch your boost for the first dyno runs and adjust the AVCR duty cycle accordingly. I also get the operator to watch the AFR and I watch the boost & rpm myself. This way you should be able to avoid the spikes. Boost spike aside the dyno runs look good.
Thanks for the info OZ951.the weird thing is I will never feel that little dip you would think losing 10-30 Tq you would feel but nadda.
