Originally Posted by hoddy
I have recently had the rare opportunity, of being able to tune my car using AFM & then MAP based tuning
My car has a Rotrex supercharger 12 psi boost, J tune exhaust, air intake ect, after having the car dyno tuned it was making 330 BHP which I thought was great
After driving around for a week I noticed that the car was jerky, idled roughly & had a power band like a 2 stroke, running very rich
I ended up contacting E-Tunze & Vitialy (Vit) e-mailed me so I sent the tune to him, & basicaly needed to re tune the tune
Once the AFM tune was complete (I thought) the car was wonderfull, mid range increased, no flat spots, throttle response good & then Vit asked me if I had considered a MAP based tune as the AFM tune was maxed out & there was still more left to tune
So I thought why not as if it was no good I could always change back
After a lot of data logging & re mapping & after about 2/3rds of the way through the spark plugs started to misfire & so they were replaced (BKR8EIX)
In the end this tune won me over as throttle response was better, part throttle excellent, there is extra mid range & a little more in the top end, transition to V-tech & boost more linear, but it is the overall feel of the car was much better, smoother
To be fair because of the new plugs I put the AFM tune back & drove the car to work & back about 60 klms & noticed straight away the difference, the car was blunted more sluggish, less responsive, part throttle not as good ( do not get me wrong still very good)
I then re installed the MAP tune & it just re confirmed how much better it is, I would recommend this type of tune even though there is a few dramas with the fuel guage (just nick picking)
When I get the chance I will compare both tunes on a dyno run & post the results, should be interesting
I would like to thank Vit for his help & patience, it certainly taught me a few lessons
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