Trying to figure out what turbo to get, I want to be s475 1.32 ar, don't know if it would spoll good enough, I'm working with a 06 5.3 4l80e.

 

What are you goals though?

Do you have a power range you wish to be in or do you just want a turbo that can make 500hp and light off really quick?

 

What size tires? I have 275/55-20's and they are tall enough, I really need 4.10 instead of 3.73 with my s475 t4 1.0 a/r.

 

Most power I can make really! Tires are 245/65/17 dd tires. Track or race 28" Hoosier. I don't wanna change gear again right now, because they only have like 1-200 miles on them

 

What gear is in it now? My truck with a 5.3, s480, 80e and 3.42’s is a turd till it gets spooled. I am running a 28” slick as well and am planning on going to a 4.10 or even a 4.30 this winter. Can’t decide yet.

 

4.10 in there right now! Just put them in few months ago

 

Out of curiosity, you guys don't think a 4.10/4.30 gear is too much for a turbo application..... I'm in the middle of doing a twin GT45 69mm build on my Dakota, I have 4.30's for the truck, but wasn't sure if they would make a turbo run out of steam...... The motor is a 390 ci small block Mopar. I'm very curious to know if this setup will work for me, as I don't want to install another set of gears if I don't need to.

 

What size tires?

You should be able to plug your transmission gearing, rear end ratio and tire size into a calculator to determine what your max speeds are going to be and what rpm's you'll be turning at cruise speeds.

Drag racing tools 1/4 mile & 1/8th mile conversion calculators.

There are many other calculators out there to use as well, here is an example.

Like if you don't want to already be in 5th gear at the 1320 foot mark, then going to 3.73's or 3.90's depending on tire height and transmission gearing might be what you are after.

 

Thanks for the link, that's something I'm going to use here in the near future..... I have a set of 31" tires for now, but I'm considering dropping down to a 29" once I wear these out..... I'm still in the building stages. I've also got 3.73's for the truck as well. I don't want to think about 5th gear until I swap in a GForce-5R5 for it. Then it's all good.