3.55's or 3.73's on turbo car.

[LoboGrandeMalo]

Hey I have a 76mm turbo that doesn't spool at all in 1st gear. I currently have 3.73's in it. If I put 3.55's will this cause the turbo to spool in first? Also will that make me quicker if I'm making more power from 1st?

Thanks guys.

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01 Turbo Bullitt 76mm - Heads/Cams/Intake etc. All Forged. 615@15psi

 

[Cobra123089]

yes a lower gear numerically will help load the turbo and spool it. I ran 4.10's with my turbo it sucked.

 

[Night Shifter]

id stick with the 3.73's

 

[trinity_gt]

Big turbo == big lag.

Taller gears may help with the lag but at the cost of reduced mechanical advantage. It may be a wash in the end.

A shot of nitrous might help to wake that thing up...

 

[Jakencub]

you worried about off the line power or just when riding around?

 

[ttopstang]

I see alot of guys running 3.55's in their turbo cars.

 

[millhouse]

Where is your powerband at and where do you plan on shifting?

Yes, lower numerical gears will help reduce lag and will allow you to achieve a higher mph in the 1/4 before redline. This all however needs to tie into your combo. If you are shifting at 7k RPM and will only be trapping 130mph in the 1/4 mile, you'll be leaving a lot on the table with some 3.27's (the most commonly used turbo gear). If however you plan on shifting at < 6k RPM with similar trap speeds, a 3.27 will likely be a better gear.

There really won't be a 100% right answer here until you get some solid number in the 1/4 mile and a powerband from the dyno.

Either way, if you plan on running down the strip with some sticky tires a 2-step is an absolute MUST on any turbo'd vehicle. There is no need for nitrous when you are able to launch with 8+psi of boost off the line.