What size TB should I go with?

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What size TB should I go with?

October 12, 2005, 07:57:51 AM

As some of you may have read, I'm installing the Trick Flow top end kit on the 5.0. I got the street heat intake rated for 0-5500 RPM's as an optimum runnning range. I'm going 24#'s on the injectors and was just trying to get a feel of what size TB I should go with. I'm 90% set on a 70mm. Just wanted some opinions on it.....

[LIST=1]

65 MM
70 MM
75 MM
THE TORPEDOS! 90MM!!!!!!!!!!!!!!!!!

And I made the list because I ca't figure out how to do a poll, sorry.

What size TB should I go with?

Reply #1 – October 12, 2005, 08:50:52 AM

What are the specs on the cam and the heads? What will you be running as far as exhaust(headers: shorty/full length, cats/no cats, tailpipes or dumps). I would actually recommend against the Street Heat intake, it falls off much earlier than other intakes and makes less below the curve than others as well. You would be better off upgrading to the Track Heat intake or even going with something like the Holley Systemax or GT-40. I would go with the 70mm TB for that application. Also, if it's an automatic, make sure you go with at least a 2200-2800 stall convertor and some decent gears.

What size TB should I go with?

Reply #2 – October 12, 2005, 11:31:56 PM

70mm is about the right size size.as far as the intake is concerned,i would say it's according to the rest of your setup.are you running stock rod bolts?if so,5500 is about all you would want to turn it if you are looking for longevity.what cam are you running?don't want much duration if you aren't turning it past 5500.good luck with your project Paul.

What size TB should I go with?

Reply #3 – October 13, 2005, 01:17:53 AM

i would go with the 75mm it is not like a carb one to big will just help throttle responce as the mass air meter measures airflow to feed fuel to it.

if not i would go with the 70mm

What size TB should I go with?

Reply #4 – October 13, 2005, 07:48:49 AM

It's the TFS stage 1 Cam
http://store.summitracing.com/default.asp?target=partdetail.asp&part=TFS%2D51402000&N=400098+4294887637+4294908331+4294840126&autoview=sku

This is all the stuff I'm putting on. The motor has forged flat-top pistons which will remain in place.

http://store.summitracing.com/default.asp?target=partdetail.asp&part=TFS%2DK514%2D350%2D370&N=400098+1011&autoview=sku

I'm going with 24# injectors and have all the other associted parts to finally switch to Mass Air. A new torque convertor is in the works as well, but I'll hold off a couple of months on that.

What size TB should I go with?

Reply #5 – October 13, 2005, 09:25:56 PM

A 75mm will cause a slight loss of low end torque and it might be a little too agressive for the stage 1 cam. A 65mm is okay but will choke it off a little above 4500rpm, a 70mm is probably the perfect balance for your combo and will even support some further upgrades.

What size TB should I go with?

Reply #6 – October 14, 2005, 09:20:07 AM

I run a 65 with the Stage-1 TF cam and heads, but my buddy runs a 70mm on a similar combo with a Stage-2 cam... He's run 7.7s so it works for him....