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SVTPerformance's Chain of Restaurants
Tuning À la carte
Is Your Car Tuned Correctly?
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<blockquote data-quote="itzl0l" data-source="post: 12512111" data-attributes="member: 98334"><p>You do realize (you do right?) that no1 buys a Cobrajet and then goes immediately to the track and expects to be competitive in their class. Many of these cars run full standalone ECU's...Bigstuff...fast...whatever. I know Kurgan has tuned his fair share. </p><p></p><p>OEM, mass produced cars like the Shelby's, Roush, Saleens, Focus, Rapors ect (that you named) CERTAINLY do have their mass air curves created on a flow bench (per the OP)...thats how oems do it. (where nearly every combination is identical)</p><p></p><p>The AFTERMARKET ....changes all that around....you start running one-off combinations of MAF housings/intakes...you change anything that effects flow across the sensor and guess what...your curve is off. There is no feasable way to take my exact intake combination to a flow bench and get exact numbers. So you do what any competant tuner does....you adjust the mass air xfer to correct for these variations. Why would you change the fueling side of things? Those are known/good values?</p><p></p><p>Again...this is EXACTLY what the most highly regarded tuners do.</p><p></p><p>The OEM calibrators use a known curve for their exact, repeatable situation.....as soon as that changes it is up to us to make the corrections to the curve for our application. Simple.</p><p></p><p>Granted, you cant get all willy nilly with the corrections.....I've seen some hacked up maf curves. This is bad. You cant tune around a mechanical issue. But to say that adjusting the MAF xfer is wrong...its well....wrong.</p></blockquote><p></p>
[QUOTE="itzl0l, post: 12512111, member: 98334"] You do realize (you do right?) that no1 buys a Cobrajet and then goes immediately to the track and expects to be competitive in their class. Many of these cars run full standalone ECU's...Bigstuff...fast...whatever. I know Kurgan has tuned his fair share. OEM, mass produced cars like the Shelby's, Roush, Saleens, Focus, Rapors ect (that you named) CERTAINLY do have their mass air curves created on a flow bench (per the OP)...thats how oems do it. (where nearly every combination is identical) The AFTERMARKET ....changes all that around....you start running one-off combinations of MAF housings/intakes...you change anything that effects flow across the sensor and guess what...your curve is off. There is no feasable way to take my exact intake combination to a flow bench and get exact numbers. So you do what any competant tuner does....you adjust the mass air xfer to correct for these variations. Why would you change the fueling side of things? Those are known/good values? Again...this is EXACTLY what the most highly regarded tuners do. The OEM calibrators use a known curve for their exact, repeatable situation.....as soon as that changes it is up to us to make the corrections to the curve for our application. Simple. Granted, you cant get all willy nilly with the corrections.....I've seen some hacked up maf curves. This is bad. You cant tune around a mechanical issue. But to say that adjusting the MAF xfer is wrong...its well....wrong. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
Is Your Car Tuned Correctly?
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