2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

S5 turbo afm different from S5 n/a?

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Old Oct 12, 2003 | 07:47 PM
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xfeastonarsex's Avatar
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S5 turbo afm different from S5 n/a?

I tried to look for this in the search but "there is a slight problem" So I figured I would ask and get a quick answer. Is there any difference from the cone s5 n/a afm and the s5 turbo cone afm? I just now thought of this so if someone can let me know I would appriciate it.
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Old Oct 12, 2003 | 11:34 PM
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The AFM's are different, but the dimensions are the same. A cone will work on both n/a and TII afm's.
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Old Oct 12, 2003 | 11:37 PM
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For both S4 and S5, the NA and Turbo AFM's are externally identical, but are calibrated differently because of the Turbo's higher airflow.

Using a Turbo AFM on an NA will result in leaner mixtures. Using an NA AFM on Turbo will result in richer mixtures, but the cone will reach the end of its travel before peak load is reached, so mixtures will then go lean.
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Old Oct 12, 2003 | 11:43 PM
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Originally posted by NZConvertible
For both S4 and S5, the NA and Turbo AFM's are externally identical, but are calibrated differently because of the Turbo's higher airflow.

Using a Turbo AFM on an NA will result in leaner mixtures. Using an NA AFM on Turbo will result in richer mixtures, but the cone will reach the end of its travel before peak load is reached, so mixtures will then go lean.
Since we're getting technical, S5 AFM's are calibrated to the injectors. The fuel maps are the same. Im currently running a TII AFM anf 550's all around on my n/a, and it runs just as good as the n/a AFM and 460's. I used the TII AFM for the extra range. I pegged the AFM by 5K rpm with my last motor...
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Old Oct 13, 2003 | 10:33 AM
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If I run my n/a in my turbo, would I be able to modify it so I can get it to run where a TII would be able to. Or during the break in period would it be ok to run the n/a afm in the turbo for a little while?
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Old Oct 13, 2003 | 10:43 AM
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ok better question what is the part code for the TII AFM ? n...
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Old Jul 8, 2004 | 02:15 PM
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Originally posted by NZConvertible
For both S4 and S5, the NA and Turbo AFM's are externally identical, but are calibrated differently because of the Turbo's higher airflow.

Using a Turbo AFM on an NA will result in leaner mixtures. Using an NA AFM on Turbo will result in richer mixtures, but the cone will reach the end of its travel before peak load is reached, so mixtures will then go lean.
Just to confirm, N350 NA AFM with N370 TII ECU will provide more fuel?
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