tbichips.com (Brian Harris). Useful or Not?

[Fast355]

speed density tuning is a long process and shouldn't be trivialized, and anyone that says they can nail it on the first try is probably full of it.

i've seen tbichips tunes with minimum and maximum blm really tight so the trims never wander too far from 128, just so his VE tables look like they're working. that's pretty shady indeed.

I can generally get them driveable in 1 or 2 stabs. The last Vortec head, cammed 350 TBI setup I tuned using the abysmally slow 7747 data stream I had on the money in about 6-7 burns total. It was running well after about 3 or 4 but he was not running enough fuel pressure and moved the MAP sensor vacuum port on his Holley TBI per my recommendation from the rear to the front. Its a defect that applies only to Holley TBIs that creates an artificially high map signal at idle due to the IAC. Last I spoke with him he is still running the Holley TBI @ 21 psi fuel pressure which a well known TBI tuner told him is impossible to tune for.