Fastman Throttle Body - Dodge Challenger Forum: Challenger & SRT8 Forums
Bolt On's Anything related to the quick Bolt-On mods. This includes cams, heads, catch cans, shifters, T-stats, coils, injectors, strut braces, etc.

 
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post #1 of 5 (permalink) Old 03-03-2019, 02:17 PM Thread Starter
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Fastman Throttle Body

I just ordered the standard mod from Fastman for my 2017 Challenger RT 5.7. I was just wondering if I had to tune it in order for it to run proper? It’s under warranty still so I haven’t messed with the PCM yet. But I heard some stories if I don’t tune it it’ll make my car feel sluggish is this true?
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post #2 of 5 (permalink) Old 03-03-2019, 11:48 PM
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Originally Posted by War View Post
I just ordered the standard mod from Fastman for my 2017 Challenger RT 5.7. I was just wondering if I had to tune it in order for it to run proper? It’s under warranty still so I haven’t messed with the PCM yet. But I heard some stories if I don’t tune it it’ll make my car feel sluggish is this true?


Always seek to get a tune when adding things that alter air fuel trims but realistically you don’t need to for this.
I put a fastman 88mm on and didn’t tune it for months. No ill effects and no sluggishness.


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2013 Challenger R/T Automatic
HP Tuners tuned, 270 Comp cam, BES ported heads, 3.91 rear, Driveshaft Shop one piece aluminum driveshaft, OCPerformance dual plane intake manifold, 88mm Fastman ported throttle body, custom side dump straight pipes, JBA longtubes and a healthy shot of giggle gas via Nitrous Express
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post #3 of 5 (permalink) Old 04-14-2019, 10:13 AM
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curious what you got for a power gain with the tb and tune?
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post #4 of 5 (permalink) Old 04-14-2019, 11:06 AM
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I had FM mod my throttle body. I drove the car for about four months until I got the dyno tune done. I noticed no change in performance before the tune. FM is a great guy to work with and turn around time was good and exactly what he told me the time frame would be.

2010 Challenger SRT8 M6: TorRed, Barton (skip shift+), Mopar Performance Long Ram CAI and Exhaust Tips, Fastman TB mod, Speedlogix Strut Tower Brace (front and rear), Brass Monkey Wheels (clones), Arrington Catch Can, 30% Tint (doubles the hp)
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post #5 of 5 (permalink) Old 04-15-2019, 03:55 AM
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Fastman modified my stock TB from 80 to 84mm. Very nice work and delivered as we agreed. The gains from a TB mod are small and won't be felt unless there is a sophisticated method to measure before and after. It's one of those every little bit helps mods.

When asked about tuning for the TB my tuner said "your tune is good for a TB mod". My question is why would recontouring and increasing TB throat required a retune? Since the engine is NA it's only going to flow what it's size and rpm require. I don't understand what tables would need to be modified for a slightly quicker transition of airflow or a slightly increased maximum airflow. Granted my tuning knowledge is minimal but I'm hoping some of the guys with greater tuning knowledge can provide some useful information.

2016 Challenger Scat Pack Shaker
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Tazer, BT catch can, ported intake manifold, Hemifever Tune, Fastman 84mm TB.
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