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Exorcist- tune question

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Old Jun 19, 2018 | 09:40 PM
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Default Exorcist- tune question

My brother just took delivery of a Hessesy exorcist. He opted for a whipple not a procharger.

At idle if you stab the gas and let off when the rpms get back to idle it revs back up to 1500 or so. Feels like it does this to keep from stalling. He says it has happened at a stop sign too while out on the road.

Is this normal?
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Old Jun 20, 2018 | 08:03 AM
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If he paid for a new Exorcist, he should take it back to Hennessy and get it fixed. Just needs a tune adjustment.
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Old Jun 20, 2018 | 09:35 PM
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He did in fact pay for it, not really my thing but he has the cash so there it is.

I wasn't sure if that surge was needed to keep it idling given the Cam/head,inj combo

What is the likely tune adjustment needed given this symptom?
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Old Jun 21, 2018 | 02:39 AM
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the torque tables need to be adjusted. driver demand and virtual torque in particular.
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