What size turbo is good for me

[95Tbird SC]

Hey guys I dont have a GN but I like them. I have a Thunderbird SC. I am wanting to remove the supercharger and put on a turbo. What size turbo would you guys recomend for around 450HP. I was lookin at a TO4E. I want to to spool around 2500 and last to around 5500 to 5800 RPM. Is a T70 to big? Thanks for any info.
David

 

[JZ 97 SS 1500]

A T04E-60 would do the job. Will spool quickly and will make good power throughout the rpm range.

Jose

 

[95Tbird SC]

thanks for the info.

 

[OneLethal87GN]

If it were my car I'd stay with the supercharger and just get a different pulley for it. You'll have no lag plus it'll be alot cheaper. If you run into detonation with the pulley change just get an alky kit and problem solved. JMO.

 

[95Tbird SC]

it already has a pulley on it, it makes 15 psi. I also already have 75mm MAF, 70MM TB, underdrive pullies, gears, and exhaust. Its not fast enough and supercharger upgrades cost more than for me to make a turbo setup for it.

 

[ITSAV6]

sc vs turbo

A little shot of nos? The cost of fabbibg will be high but worth. An auto will work better with the turbo. A stock gn turbo might work ok.

 

[95Tbird SC]

do you think a T70 would be to big? What do you think it would spool by? I plan on fabing everything myself. and what is a good external wastegate to use?

 

[ITSAV6]

t70

Dont the SC engine only hold up to 400 or so hp? Just buy a used stocker for the fabbing and see how it does. Then go from there.

 

[JZ 97 SS 1500]

You could run a T70, but you would need to keep the A/R down around a .6-.7 for it to be responsive. The wastegate I would go with a Tial 44, or Turbonetics racegate, or even the Turbosmart Progate.

Jose

 

[95Tbird SC]

the one im lookin at has a .70 a/r on the compressor side.
yes it holds around 400 HP on stock bottom end. I plan on using a Pro-M 87MM MAF with 42lb injectors. and my FMIC flows up to 900 CFM so I hope it will all work together.

 

[ITSAV6]

turbo

You might want to look at a TA49 or the TA32. Both exceed your blocks capability. You will need the lowest ar on the ex housing for quick spool with the 5 spd and a blow off valve for keeping spool during gear changes. Following is from Precisions web site,link is on home page of this site............

TA series turbos include a new Billet aluminum inlet bell that eliminates the stock valve cover breather tube connection. This allows for the push-in style K&N filer in the passenger side valve cover. The stock adjustable wastegate actuator is a direct bolt, as is the stock or aftermarket downpipe.
STOCK APPEARING
Part No. HP Level Converter Performance
TA32 460 2,400 Min. Stall High 11-second
TA49 545 2,600 Min. Stall High 11-second
TA60 570 2,800 Min. Stall Mid 11-second
TA51 580 2,800 Min. Stall Low 11-second
TA52 590 2,900 Min. Stall High 10-second
TA53 600 3,000 Min. Stall Mid 10-second
TA54 610 3,000 Min. Stall Mid 10-second
TA63 670 3,200 Min. Stall Mid 10-second
TA64 680 3,300 Min. Stall Mid 10-second



Performance Turbochargers
If you're looking for a non-stock appearing turbo with all out performance the number one priority, these turbos are for you!. They fit all 1986-1987 Turbo Buick and 1989 Turbo TA's.

Most of the these turbos require an aftermarket torque converter with a higher stall rating than the stock converter to maintain proper spool up characteristics. These turbos will support 12-second street cars to low 9-second full out drag cars.

Most turbo models are available with both standard and heavy duty spring wastegate actuators. All models listed come standard with our PTE 3-bolt turbine housing in either .63 or .85 A/R ratios. Each turbo utilizes a custom adjustable wastegate actuator that has the correct bracket for true bolt-on compatibility. Actuators are available at extra cost

Buick Performance 3-bolt
Part No. HP Level Converter Performance Notes
TE32 480 2,400 Min. Stall Low 12-second Non-Stock
TE34 545 2,600 Min. Stall High 11-second Non-Stock
TE44 580 2,700 Min. Stall Mid 11-second Non-Stock
TE60 600 2,800 Min. Stall Mid 11-second Non-Stock
PT51 585 2,800 Min. Stall Low 11-second Quick Spool
PT52 600 2,900 Min. Stall High 10-second Quick Spool
PT53 610 3,000 Min. Stall Mid 10-second Quick Spool
PT54 620 3,000 Min. Stall Mid 10-second Quick Spool
PT61 675 3,200 Min. Stall Mid 10-second Quick Spool

 

[95Tbird SC]

is .84 on the exhaust side to big. What RPM would it spool at with that big of turbine side?

 

[ITSAV6]

ar

Couldn,t tell you, the higher ar makes power on upper side but spools slower. With the 5 speed you need a very quick spool.