Right now i have 65 mm tb as well as 19lb injectors, and was wondering what difference it would make if i switched to a 75mm tb. I have a lot of unknown mods on my car, bought it this way, but am making about 295 whp. 
75 mm tb too much?
- Thread starter huRACEmentPSR
- Start date
i was in a rush posting the first time, i have a gt40 upper and lower, either b or c cam, gt40 heads on a new shortblock, with full exhaust. they left the 19lbers for smog, and im pretty sure it needs some 24s with a matched maf. im just wondering if it would be a good idea to go with a 75mm tb, or overkill. any imput is apprecieated
Its not overkill with heads, cam, intake. You will need to dremel port the opening of the manifold. Don't expect earth shattering gains, but you should see a difference at the track. I dunno your goalss, but money may be better spent elseware. Although after you sell the 65mm, it won't be a whole lot extra out of your pocket for the 75mm. Be sure you port match the inlet or the 75mm will not help.
ok...i just found a 75mm on a local classifieds for like $90 and thought it would be worth an ask
I have a BBK 75mm tb and matching BBK Egr spacer. I also have a trick flow intake setup that matches the 75 mm at the inlet. Over stock, I did notice a bit of difference. Definately upgrade the injectors and MAF with any addition of more air to the motor. Prevent yourself from chasing a lean condition. 24lb injectors are what I have in my 308, but I am thinking of running 30lb to compliment the amount of air being sucked in. Good luck...
vikingpower
New Member
Grn92LX said:
19#injectors are fine with an AFPR and upgraded fuel pump to keep them supplied with fuel and a little extra line pressure
