Simple/Cheap Airflow Improvement

[Rey]

Much has been written about increased airflow - K&N filter, secondary cats delete, and aftermarket exhaust. Everything helps a bit, but no single mod will bring dramatic power increases.
One mod that seems to be overlooked is the throttle body itself. The Chevrolet crowd has explored this subject. I had a Cadillac CTS-V with an OEM 76mm throttle body. Exchanged it for a 95mm body with nice results, meaning more power and no loss in driveability.
To date no one make a larger throttle body for the Tau V-8. But there is one source in FL that will bore out/enlargen any throttle body for about $100. See www.maxbore.com.
I did this on my '12 RSpec with nice results. Power increase is not huge, maybe 5-7 hp at wide open throttle, but every little bit helps. Maxbore does beautiful work with very fast turn around. Removing and replacing your throttle body is very, very easy - just four 10mm nuts and a couple of hoses.

 

[DavidHanLee]

Thanks for sharing.

 

[Youseethefight]

where in florida is this guy located?

 

[Rey]

MaxBore is a one-man operation located in Sanford, FL.

 

[84FordMan]

I have been wondering about this ever since discovering the difference between a 3.5" and 4" intake pipe was 12 RWHP with a tune.

 

[svensk]

GM guys also switch to 4" intakes for anything making decent power. Only problem with doing a larger throttle body and intake is that you need a re-tune - which isn't an option for the 5.0L's.

 

[CRSpec]

Much has been written about increased airflow - K&N filter, secondary cats delete, and aftermarket exhaust. Everything helps a bit, but no single mod will bring dramatic power increases.
One mod that seems to be overlooked is the throttle body itself. The Chevrolet crowd has explored this subject. I had a Cadillac CTS-V with an OEM 76mm throttle body. Exchanged it for a 95mm body with nice results, meaning more power and no loss in driveability.
To date no one make a larger throttle body for the Tau V-8. But there is one source in FL that will bore out/enlargen any throttle body for about $100. See www.maxbore.com.
I did this on my '12 RSpec with nice results. Power increase is not huge, maybe 5-7 hp at wide open throttle, but every little bit helps. Maxbore does beautiful work with very fast turn around. Removing and replacing your throttle body is very, very easy - just four 10mm nuts and a couple of hoses.

Have you noticed any issues since doing this?

 

[Rey]

No retune is required as the basic range of adjustment in ECU compensates for additional airflow effortlessly.

 

[scooter]

GM guys also switch to 4" intakes for anything making decent power. Only problem with doing a larger throttle body and intake is that you need a re-tune - which isn't an option for the 5.0L's.

Generally the problem with transitioning to a larger diameter intake is that the MAF is housed in the intake and so the ECU MAF tables need to be rescaled for the larger diameter piping. The '13 5.0L's, however, as I understand it (I take delivery this weekend) don't have a MAF sensor. Not much use for '12 and earlier but would seem to be less of a constraint for the '13 MY.

 

[svensk]

Generally the problem with transitioning to a larger diameter intake is that the MAF is housed in the intake and so the ECU MAF tables need to be rescaled for the larger diameter piping. The '13 5.0L's, however, as I understand it (I take delivery this weekend) don't have a MAF sensor. Not much use for '12 and earlier but would seem to be less of a constraint for the '13 MY.

Very true, the 5.0's are speed density calibrated so they might take advantage of more air without a retune.

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