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Old 08-05-2014, 04:26 PM   #1
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Throttle body size question

Hi I currently have a 302 with the trick flow top end kit stage 1 cam. The car dynoed at 272 hp with the stock throttle body. Just wondering do I go with the 70 mm or the 75mm. I would like to supercharge the car in the future but don't wanna steal horsepower from it right now. So I guess what iam asking is will the 75 mm help me out with my current setup.


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Old 08-05-2014, 05:03 PM   #2
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What is the opening of the intake manifold?


Just get a 75 Accufab and call it a day.
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1989 Sonic Blue LX Coupe, 349 ci, TW heads, TFS Track Heat Intake, 75mm Accufab TB, 80mm ProM, 30 lb. inj, TKO, 3.73, 31 spline w/ TruTrac, MAC 1-5/8" LT headers w/ H pipe, Flowmaster, electric fan Moates QH
391 rwhp & 424 rwtq...Mustang Dyno 11.5@122mph
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Old 08-05-2014, 05:04 PM   #3
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I got the trickflow track heat upper and lower intake manifold


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Old 08-06-2014, 07:30 AM   #4
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Take a set of digital calipers and measure the intake opening itself. Whatever that is, get that size TB if you are supercharging.

Also those numbers are really, REALLY low for that kit. Stock TB could account for some of that low number but not all. What is the rest of your combo?
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Old 08-06-2014, 09:06 AM   #5
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Is your car auto?


In what condition is your bottom end?


It does seem kinda low.
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1989 Sonic Blue LX Coupe, 349 ci, TW heads, TFS Track Heat Intake, 75mm Accufab TB, 80mm ProM, 30 lb. inj, TKO, 3.73, 31 spline w/ TruTrac, MAC 1-5/8" LT headers w/ H pipe, Flowmaster, electric fan Moates QH
391 rwhp & 424 rwtq...Mustang Dyno 11.5@122mph
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Old 08-06-2014, 10:48 AM   #6
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Didn't see that, yeah if he is an AOD with a slipping stock converter that could account for most of it. If manual, its way low. Although dyno numbers should always be secondary to timeslips as plenty of dyno queens or internets racers find out.
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Old 08-06-2014, 10:58 AM   #7
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The car is a five speed. Bottom end has 160000 km on it.it has stock headers on it too.


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Old 08-06-2014, 11:00 AM   #8
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Throttle body size question

The place that I got the car tuned at I was not really happy with. Next year I will take it some where else. That number was 272rwhp the guys at the shop said it made 340 at the crank.


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Old 08-06-2014, 12:43 PM   #9
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Stock headers and TB are choking the **** out of that motor. Post a full mod list and we can tell you where to unlock some power but if you throw some longtubes on it with a good mid pipe and catback, upgrade the TB/MAF, do pullies, a good air intake and then tune it you will for sure hit 300 to the wheels provided your bottom end is good. Did you do a compression/leakdown test on it before you did the HCI?
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Old 08-06-2014, 01:00 PM   #10
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I have subframe connectors
Trick flow upper and lower intake with a one inch spacer
Trick stage one cam
Trickflow 170cc head
255lph warlbo fuel pump
24pound injectors
Pro m mass air meter
Ford racing wires
1.7 roller rockers
Smog pump delete.
Stock headers down to a h pipe no cats. Flo pro mufflers
That's all I can think of I never did check the bottom end I kinda put the h/c/I kit on the car spur of the moment not the most mechanical guy out there so any help is awesome.


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Old 08-06-2014, 01:32 PM   #11
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Why do you have a spacer? Do you need it?


Slap some 1-3/4" headers on it with an off road h pipe.


Also a 75mm TB will make a difference.
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2016 VW GTI 2.0 Turbo

1989 Sonic Blue LX Coupe, 349 ci, TW heads, TFS Track Heat Intake, 75mm Accufab TB, 80mm ProM, 30 lb. inj, TKO, 3.73, 31 spline w/ TruTrac, MAC 1-5/8" LT headers w/ H pipe, Flowmaster, electric fan Moates QH
391 rwhp & 424 rwtq...Mustang Dyno 11.5@122mph
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Old 08-06-2014, 01:54 PM   #12
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Need the spacer so the upper intack would clear my valve covers


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Old 08-06-2014, 01:56 PM   #13
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Any headers that you recommended


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Old 08-06-2014, 02:29 PM   #14
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I like the MAC for budget stuff better than BBK.


Now if you have some coin I can spend that real quick.
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2016 VW GTI 2.0 Turbo

1989 Sonic Blue LX Coupe, 349 ci, TW heads, TFS Track Heat Intake, 75mm Accufab TB, 80mm ProM, 30 lb. inj, TKO, 3.73, 31 spline w/ TruTrac, MAC 1-5/8" LT headers w/ H pipe, Flowmaster, electric fan Moates QH
391 rwhp & 424 rwtq...Mustang Dyno 11.5@122mph
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Old 08-06-2014, 02:34 PM   #15
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Kinda done this as a budget build I have bought 90% for the car used


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Old 08-06-2014, 02:52 PM   #16
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Throttle body size question

Kinda done this as a budget build I have bought 90% of the stuff on the car is used.


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Old 08-06-2014, 02:57 PM   #17
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One more question if I put the throttle body and headers on should I get the car tuned again.


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Old 08-07-2014, 07:16 AM   #18
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You probably should get a re-tune when you are done with that, just to get all the power out of it you can but you don't NEED to. Generally a re-tune is much cheaper than the initial.

For headers if you are doing shorties, get the FRPP stainless ones. They are far and away the best shorties for the 5.0, it isn't even close. Ceramics are better and will last practically forever.

For longtubes, BBK and MAC are about the same for the 5.0 pushrod as far as fit/finish/quality as well as ground clearance. The only "gotcha" with the pushrod is that if you get BBK longtubes you need a BBK mid pipe and vice versa with the MACs. The MACs are wider than the BBKs so the mid pipes don't interchange. They'll both bolt up to any catback though so don't worry about that.

The reason your numbers are low with the exhaust is because 1 and 1/2 primaries (that aren't even that because they are crimped for header bolts) going to a 2.25" pipe. The 2.25" pipe is not that bad but the headers are just choking the life out of those heads.
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