Which TB 102 or 92?
Which TB 102 or 92? I'm making some updreads on my 02 Camaro. I'm installin a FAST 92/102 intake, AFR 210 heads, and a Comp Cams cam I.605 @ .050 E.610 @ .050 112 LSA.
I'm trying to decide several things.
1. Which TB thw 92 or 102. Will I see any HP difference from one to the other?
2. What size MAF should I install? And again will I see any HP difference from one to the other?
3. Which air lid and what size? And again will I see ant HP differences?
Have any of you done any actual dyno testing to see which set up is the best?
The car will see some street duty but will primarily be a track car.
Any input would be very helpful.
Thanks.
I'm trying to decide several things.
1. Which TB thw 92 or 102. Will I see any HP difference from one to the other?
2. What size MAF should I install? And again will I see any HP difference from one to the other?
3. Which air lid and what size? And again will I see ant HP differences?
Have any of you done any actual dyno testing to see which set up is the best?
The car will see some street duty but will primarily be a track car.
Any input would be very helpful.
Thanks.
TECH Senior Member
Joined: Feb 2009
Posts: 5,445
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list your cam specs,duration and such.if you are running a stock cube ls1, go with a 92mm TB a 92 mm TB is easier to tune no loss of power,compared to a 102 mm TB .have herd a 85 mm MAF is good to 500 rwhp.consider a 100 mm MAF from Texas Speed.
i run a 98mm FTP lid, GM 85mm MAF and FAST 92/92 combo, pretty happy with it and the throttle response, the stock MAF has been known to run up to 500hp so no real worries there. i got my maf real cheap that is why i upgraded
I run all the big stuff, stock cubes, 228/231 cam. Throttle is a touchy sombitch, but I love the setup. Ftp 104 lid will rub your hood, big maf will give really low counts at idle, but if nothing else I just like having it all the same size. . .my tuner said he has seen people's lose power with the big maf just not metering well enough...but my car put up 450whp sae, idles nice too. Im not saying its the smartest money you can spend.
...and for reference the silicone hose tsp supplies with the maf is too short to use with a nw102 in a SS. I used a sewer pipe coupling cut on an angle.
...and for reference the silicone hose tsp supplies with the maf is too short to use with a nw102 in a SS. I used a sewer pipe coupling cut on an angle.
102mm will be better on bigger HP builds. 102mm on a smaller HP setup will be harder to tune and could probably not show any HP increase. I think 92mm will suit you better for now, once you go bigger and go into forced induction I think 102mm will be a good choice. 
FormerVendor
Joined: Nov 2012
Posts: 390
Likes: 0
From: Dyno Tuning in KY
Depends on the throttle body. I went from a 92mm to a 102 that had a slight mound on the bottom of the bore to stop airflow at lower tps to only allow airflow on the top part of the TB. Drivability improved greatly and didn't have nearly as touchy throttle.
This was on a heads cam intake stock bottom end ls1.
This was on a heads cam intake stock bottom end ls1.
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Staging Lane
Joined: Nov 2012
Posts: 89
Likes: 0
Maybe I can get an answer here, why am I seeing people go with a 92 tb on a 102 manifold? Seems like a waste of the flow potential the 102 offers to me. I've got a 383 ls1, 11.5 comp 240's cam making 460rwhp ATM so what size would every one suggest for that???
I doubt youre going to see any difference in whp between the two. 800+ whp FI cars run the 92, my 450whp NA 346 is running the 102. I like it and feel there is no downside. . .but like everything else folks are going to argue. Drink the Kool aid if your choice, I honestly doubt it will matter.
FormerVendor
Joined: Nov 2012
Posts: 390
Likes: 0
From: Dyno Tuning in KY
I guess u could thank me for adding to the 92mm tb fad. I posted a dyno result thread under my normal account (LSxPwrdZ) showing gains from stock LS6 intake to a box stock FAST102 and I used a ebay 92mm throttle body only because I had one sitting on the shelf. It sort of caught on but honestly having a 102mm TB on the car now it made the same power on the dyno. I switched because the throttle bore on the 92mm was completely smooth and I had a very touchy throttle and a very loose stall that made for some pretty crappy driveability. Even tried dumbing down the open throttle timing to dampen the effects and it helped but still wasn't what I was looking for. I found that the cheap eBay 102mm throttle bodies had a contour on the bottom of the bore that basically follows the blade opening to keep airflow from passing by the bottom side of the blade to help with low throttle control and to simulate a little bit more progressive throttle feel. It worked!
So for overall power you'll not see the difference between a 92 or 102 but if you are buying new I'd recommend the eBay 102 just for that contour on the bottom of the bore.
So for overall power you'll not see the difference between a 92 or 102 but if you are buying new I'd recommend the eBay 102 just for that contour on the bottom of the bore.
Will there really be much more air flow if you are still using the stock 85mm MAF? I would think that in order to get the gains out of the 92 or 102 you would need at least the same size MAF otherwise its a bottleneck, no?
I did not read the whole thread. But I can tell you that the 92 mm TB based on your setup will be best. You are not going to see much if any gain from going bigger since your not flowing that much air. It will be harder to get a good idle from the 102. The 92mm will be fine and is the way to go unless you plan on going with FI and pushing alot of air into it and need at little restriction as possible.
FormerVendor
Joined: Nov 2012
Posts: 390
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From: Dyno Tuning in KY
Smaller blade generally makes for better driveability due to less effective area vs tps movement to allow airflow in. If power is all your looking at there is no power difference on a 346 with heads and a big cam. I don't have a MAF on mine but rather a 4" straight tube from a 106mm FTP lid and there was zero gain from a 92mm to a 102mm.
However based on that info I would then make my decision based on throttle body style. In reference to my post above the 102mm yielded much better drivability because of the contour to keep low tps airflow from passing the bottom of the blade. This is why I went 102 vs the 92 I had on the car. Before ordering ask for pictures of throttle bores etc to give yourself a better idea of how low tps airflow will work.
This is why LS2 electronic throttle bodies have a bump in the throttle bore, to help control low throttle airflow.
There is not any idle quality difference between a 102 or 92 once the throttle body is properly setup.
However based on that info I would then make my decision based on throttle body style. In reference to my post above the 102mm yielded much better drivability because of the contour to keep low tps airflow from passing the bottom of the blade. This is why I went 102 vs the 92 I had on the car. Before ordering ask for pictures of throttle bores etc to give yourself a better idea of how low tps airflow will work.
This is why LS2 electronic throttle bodies have a bump in the throttle bore, to help control low throttle airflow.
There is not any idle quality difference between a 102 or 92 once the throttle body is properly setup.
Because the throttle body has nothing to do with flow. The FAST 102 has the most current intake manifold technology. People go for the 102 because the runners are superior to any of the earlier designs. The engine is only going to suck so much air. It doesnt matter if there is a 200mm throttle body on the front of the intake. I went with the 92mm on my FAST 102 for two reason. #1 the FAST 102 TB was about $100 more...second with my small cubes I knew there would not be a power difference between them.
FormerVendor
Joined: Nov 2012
Posts: 390
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From: Dyno Tuning in KY
Mine is a godspeed 102mm throttle body. I like it better than the 92mm godspeed I had before for the reasons I said earlier plus the TPS sensor bolt holes actually line up where they are supposed to be.
