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3.7L Fastman TB, anyone have one?

6K views 33 replies 11 participants last post by  FlyinRyan 
#1 ·
I have a 2007 WK, thinking about getting a fastman tb. Looks like it would be about $240 give or take. Is anyone running one of these on their 3.7L? Are there noticeable gains, if so how significant? Is it worth the money? Thanks guys...
 
#3 ·
i really dont want to spend money on a cai right now...do you think it would make much of a difference?
 
#5 ·
does any have a suggestion on the best CAI for a 3.7L?
 
#9 ·
i think i have the electronic tb (havent checked yet), from what i understood by reading his site, he only does the core credit with cable driven tb's, my jeep is my dd so i need the ported one before i can take mine off. i will have to call him to verify all of this i guess. i would get it no question if its only going to cost me $100!
 
#17 ·
it changed in '07...like the calipers...some have it some dont. i need to look, but im pretty sure mine is electronic.
 
#19 ·
ill check tomorrow. the pens just lost to the habs... embarrassing! and i also just finished a piece for an art show on saturday. im beat.

so it seems like i should go with a cai before i do anything with the tb (which i guess makes sense)...i feel like cai's are a waste of money but im not about to rig up a homemade intake so now what i need to know is, airaid? k&n? who else makes them for 3.7's? which should i go with?
 
#22 ·
x2 - and I would get the CAI before the TB. Send Fastman your TB and he will send you his for around 100 dollars. I noticed a big difference with the fastman TB. Worth the money.
 
#24 ·
Sleepy tapers the bore to the blade on both sides...fastman does the complete bore and replaces the hardware...ie blade etc.
 
#25 · (Edited)
Scott said it best. Fastman bores for a larger blade, whereas I oval out the bore , increasing the surface area, and taper it to the stock blade, then port match to the intake manifold inlet on the backside. Really comes down to what you want. Everyone's been happy with either, including Fabian, who tested a Fastman and an early FRP TB.

I have bored + ported throttle bodies for the 4.7 on the way, if there is enough demand for it, I will set up a 3.7 program as well.
 
#28 ·
My AFRs were not an issue after I ported my own TB. I did not have a wideband O2 installed at that time until after the TB was already ported, so I can't say if the AFRs changed at all before/after, but my AFRs were safe after the fact.

I had previously run a wideband well before I ported it, if there was any difference, it may have been a few tenths of a point. With the way the stock 4.7 JTEC PCM is setup, there is PLENTY of fuel, so it was still very safe even after the TB porting.

The NGC PCMs (found in 3.7/4.7/5.7 after 2004 generally speaking, other engines may be controlled by NGC PCMs as well) do not adapt as well to changes in airflow, but even then, I have not seen or been given any evidence that would indicate that AFRs on a stock calibration are leaned to the point where it is unsafe.

Ported TBs, be it mine, or others such as Fastman, F&B, etc, are a part that does not require tuning by itself. If you have numerous other modifications, you may need a minor revision, however.
 
#30 ·
K&N FPIK or 63 Series I think are good options, I have one of them, not sure which lol but its def noticeable under heavy acceleration. Exhaust may help as well so thats on mah list. I have the baby motor as well but with an intake and powerwire and a little love she moves herself just fine for being a DD ;)
 
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