LT1Power

Hey guys,

I have an 85 with a 406" small block, about 11:1 CR, TFS 195 as cast heads, XFI 268 flat tappet camshaft with 1.6 rockers, long tube headers (1 5/8s for now), OFR x pipe and magnaflows.

Trans is 700 with 3k stall converter and 3.08 Dana 36.

The car currently has a super ram with 1985 computer system.
I am swapping over to a mini ram with XFI EZ MPI computer system. I have a 255lph holley pump.

I would like to get new injectors and tb for this car.
I am thinking of 36lb injectors and 58mm TB. Will this work?

I think 30lb injectors would be enough, but i am looking at doing a bigger cube motor with more head in the near future. Can I get away with running 36s for now? OR should I go with 30s.

Will a 58mm TB be ok?

Thanks a lot guys

oldalaskaman

I would call or email FIC , theyre a vender on the site, but I'm also sure there's others on here who are doing the same as you.

racebum

you need to know aprox crank hp to figure what injector you'll use. FIC has a calculator app on their site that's really easy to use.

if you make around 460-520 crank hp the 36s are perfect

if you make 380-430 crank hp the 30s are perfect.

select which group you fall into

as for the 58mm vs 52mm debate, i don't remember seeing any back to back dynos showing jack.

i did test an oem TB with an airfoil vs a 52mm on a 400hp 350 and gained zero, as in not even a couple hp in fact the oem had a better throttle response

bjankuski

The 36 lb injectors will be fine and the 58mm throttle body will be fine.

LT1Power

I think the motor makes a max of 450 flywheel HP.

What are the drawbacks of buying an injector too big?

Any recommendations on brand?

Thanks

WW7

Jon at FIC can answer these questions for you better then most on here..He's been doing it quite a while.Call him , he's a great guy to deal with....WW

383vett

I've got the same setup; 406 with a SuperRam. 58mm throttlebody. 36 lb injectors work fine.

Joe C

google is your friend...

http://www.google.com/#sclient=psy&h...dd74e2d1c08e35

http://www.google.com/#sclient=psy&h...dd74e2d1c08e35