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Which 102mm or 105mm throttle body is best?? Updated w/dyno sheet & video

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Old 02-26-2017, 12:36 AM   #21
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I run the Holley on my fast 102. Fit and finish is really nice. I got it for just a hair more than what a nick Williams is. But at the time I was in the market for a 102 tb, NW had discontinued their black for a while. Couldn't find it anywhere. So I went with the tapered Holley 105. Tons of options to aid in tuning. But honestly I didn't do anything more than adjust the throttle blade just a fuzz.
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Old 02-26-2017, 09:27 AM   #22
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Originally Posted by neblackshirts
SketchyVert is in my area here in Lincoln, NE and I asked him what 102 throttle body he's running and he's running a NW 102 on his FAST 102 intake. Seems like those that are running a NW 102 really like them but honestly the FAST hasn't been terrible to me. I'm really interested to hear what people think of the Holley EFI 105mm.

https://www.holley.com/products/ls_p.../parts/112-583
The fast 102 throttle mostlybhas its rep because (imo) the QC is inconsistent. There are some people that end up drilling out the IAC passage to get more air through it. Others I've talked to had to epoxy around the opening to close the gap, because they couldn't get air flow low enough. The gap around the blade was just too big.
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Old 02-26-2017, 02:25 PM   #23
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My experience with the NW 102 TB & Fast LSXRT = stalling, idle issues and poor driveability. Proably 16 to 20 hours of professional tuning, may be more I lost count.

The Fix was a Peak Ported LS6 TPiS intake that drove exactly like stock and made 2 hp more peak with my small cammed 383.


While trouble shooting the 102 TB & intake learned the following should be checked.

Check for vacuum leaks.
Check PVC and break booster connections, make sure they are correctly hooked up.
Intake seating on heads.
Retorque intake bolts.
Check TB alignment with intake snout.
Check TB blade, make sure it is centered exactly equidistant on all sides. Use feeler gauge.
Deburr IAC track in TB
Make sure TB blade closes and opens smoothly.
Dyno tuning helps conditions are controlled.
Street tuning helps.
Idle decay is an excellent band aid to mask and make stalling less of a problem.

We were able to get driveability from nearly undriveable to horrible and finally to annoying poor. I love the 92 NW TB & PPLS6 TPiS after the torture of the NW102 & LSXRT.

With enough time & resources the 102TB & intake can be tamed.
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Old 02-26-2017, 02:32 PM   #24
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Lol. Mine fired up and idled with zero tuning. It did stall when driving. But didn't take much to get it driving just as well as the 92/92.
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Old 02-27-2017, 01:35 PM   #25
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Quote:
Originally Posted by JakeFusion View Post
And if you get to where you can't reset your TPS to 0% (.70V or so), then you'll need to drill the hole. That's where the Holley has some advantages - you can clock the TPS and open the blade more and adjust the IAC bypass without drilling a hole.

And then you'll have to tune your IAC table (since it's now way off) and then all of your PID airflow, Cracker/Follower, and everything else in idle airflow. I would estimate that it will take a pro about 2-3 hours to dial it in. Seriously.

A big *** cam is easier to tune than a 102.
I have always elongated the mounting holes on the tps to make it adjustable so I can open the blade and clock the tps back to .5 volts
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Old 03-14-2017, 02:49 PM   #26
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OK I currently have a FAST 102 LSXR Intake with a FAST 102 Big Mouth throttle body but seeking information as some have suggested that I should switch to a Nick Williams. The switch has been brought up because of low air idle tuning for my 408. But I've been seeing a lot of builders using Holleys Billet 105mm and 95mm but would like to know of they are worth the $530 Holley wants for them over my current FAST 102.

Might also be worth mentioning that the cam is fairly large 243/251, .624/.624, 111 LSA and using FAST 60# injectors.


I've been told that the FAST 102mm is hard to tune and that the NW throttle bodies are much easier? But reading on Holley's Billet 105mm sound pretty good and have seen MAST Motorsports use them on builds.




Update:

Well got the car tuned by The Shop Inc. here in Lincoln, NE and they did a great job straightening out the old Mail Order tune. The Shop told me when I stopped by it made 466 at the wheels on his Mustang Dyno.





https://youtu.be/saX9VckdoKY?list=PL...lSoY3Z1vHmPCQX





Added the Dyno sheet finally
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Which 102mm or 105mm throttle body is best?? Updated w/dyno sheet & video-mustang-dyno.jpg  
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Old 03-14-2017, 03:21 PM   #27
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I have always elongated the mounting holes on the tps to make it adjustable so I can open the blade and clock the tps back to .5 volts
I still prefer to drill the hole. It makes idle more stable.
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Old 03-14-2017, 03:50 PM   #28
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I still prefer to drill the hole. It makes idle more stable.
When I get a chance I'll post my $650 tune so some of you guys can give me an opinion on it. When the weather gets nice again I wanted to do a drive video and even a drive log because man I almost turned around when I picked up the car. Cold start is better and surge when cruising is much improved but man it bucks hard when coming to a stop. Thought it was going to die the first red light I had to stop for, I actually bumped it into neutral lol. But weird part is it will fall quickly to like 500 rpm then bucks hard one time and goes back to 1100-900 like it's catching itself.


Also on the transmission side I think he left the 3rd gear settings from when he was on the dyno doing the pull. All in all it's an improvement but not 100% yet but at least the car is much more street friendly.
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Old 03-14-2017, 04:57 PM   #29
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Did you change the Throttle Body?
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Old 03-14-2017, 06:36 PM   #30
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Did you change the Throttle Body?
No still running the FAST 102 but on the fence about investing in a new throttle body. My wife seen a couple of bills from a local shop and I better slow down a bit lol. I will either go with a NW 102 or try the Holley 105mm https://www.holley.com/products/ls_p.../parts/112-581
I see that Holley offers the 105mm in a straight bore or low RPM Taper versions.
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Old 03-15-2017, 08:55 AM   #31
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Im running the Holley efi 105mm TB and could not be happier with the results. Im running it on a manifold made for a 90mmTB but there was so much material up front I was able to blend the the 2 without edges. Using a new AC Delco TPS and a scan tool I was able to put voltage at .53@ idle and 4.51 WOT, there's something to said about adjustability. The Holley has an auxiliary idle air bypass screw so that you can fine tune your idle as well. I bought it off ebay as an new but open box display for $350, I would have never spent $550 retail for one, lol.
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Old 03-15-2017, 10:16 AM   #32
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Im running the Holley efi 105mm TB and could not be happier with the results. Im running it on a manifold made for a 90mmTB but there was so much material up front I was able to blend the the 2 without edges. Using a new AC Delco TPS and a scan tool I was able to put voltage at .53@ idle and 4.51 WOT, there's something to said about adjustability. The Holley has an auxiliary idle air bypass screw so that you can fine tune your idle as well. I bought it off ebay as an new but open box display for $350, I would have never spent $550 retail for one, lol.
That's awesome to hear that it has worked out good for you. Yeah retail on one is a tough pill to swallow lol, but I've seen a few shops like Mast Motorsports use them on big builds so my hopes is that the Holley works great with big cam cars.


Did you get the straight bore or low RPM Taper version?
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Old 03-15-2017, 10:42 PM   #33
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That's awesome to hear that it has worked out good for you. Yeah retail on one is a tough pill to swallow lol, but I've seen a few shops like Mast Motorsports use them on big builds so my hopes is that the Holley works great with big cam cars.


Did you get the straight bore or low RPM Taper version?
Tapered floor.
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Old 03-17-2017, 03:03 PM   #34
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Good info here, I'm basically wanting to find something easier to tune and maybe have better low rpm street manners. One tuner absolutely hates the FAST 102 currently on my car and has suggested the NW. Be he also wants me to scale everything down from the 102 intake and 102 throttle body to 92mm setup. But the car really runs hard on the 102 setup with a great flat broad power band peaking HP at 6400 and doesn't fall at all from 6400 - 6700 cutoff.
But if NW or Holley are going to be easiest to tune and offer benefits over the FAST I'll jump into that direction.
Have you heard of fast 92's doing this?
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Old 03-17-2017, 03:14 PM   #35
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Have you heard of fast 92's doing this?
Seems like everyone or at least most say the 102s are hard to tune and not much complaints on 92s. I like the responsiveness of the 102 as it seems great once rolling but maybe I'm being a bit picky with the low rpm and idle hiccups but I really want to try a NW or Holley 105. Seems like everyone likes tuning a NW over FAST but that could be a lot of tuner preference.
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Old 03-19-2017, 05:29 PM   #36
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Was wondering if a few would look at my current tune as since I've gotten car fully tuned in Feb 2017 the Camaro seems to go into 3rd ASAP and hold 3rd a lot.


I have a post under the Automatic Forum as:
408 w/FLT 5 4L60E Yank 3600 - Need Transmission Tune Advise Please
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Old 03-19-2017, 05:39 PM   #37
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Posted my current tune under the Automatic forum under:
408 w/FLT 5 4L60E Yank 3600 - Need Transmission Tune Advise Please


Having an issue with wanting to go straight into 3rd and hold it for a lot longer. Any advise or errors that someone sees that needs changed please let me know.


Thanks everyone
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