Upgrading to bigger throttle body - flow difference
Following info is just for your information, and it's only my experience shared.
Bought bigger TB from Porsche - 78mm wide.
Original one is 72.
My engine was dynoed with OE throttle and 2.5-3.0V6 MAF (last 3 digit Bosch part number 531) and it shows 704 kg/h air flow......
Fitted the wider TB and do 2 runs with similar results - 734 and 737 kg/h flow.
And i can feel the difference - response is much sharper however i can't confirm that BHP goes up.
Maybe worth to note that same custom made intake manifold was used.
Straight swap(adaptor needed) and TB can be found for 40 - 80 pounds on eBay.....
Rear Wheel Drive Mid - Engined Alfa 156 3.0 V6 '99 - trackday car
Alfa 156 2.0 TS '00 - daily car
Fiat Coupe 20VTurbo, GT2860RS, water-meth injection 120cc, custom manifold, 3" Downpipe, FMIC - entertainment car
Last edited by Speedmaster; 19-03-18 at 21:31.