Gear ratio for turbo with T45 trans

[98 svt]

Currently I run 4.30s in the rear of my N/A 98 Cobra and have always loved 'em. The time has come for some engine work and this time around it's getting a 67mm turbo.
For those with a similar setup, I'm wondering what the best gear ratio would be. I expect the boost to come on hard and fast down low and I'm sure the 4.30s may be a bit much.

My guess is somewhere in the 3.55 or 3.73 range.

 

[BLACK97C0BRA]

I vote 3:55 myself.

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[98 svt]

I vote 3:55 myself.

Sent from my SAMSUNG-SM-G935A using the svtperformance.com mobile app

What's your setup?

 

[BLACK97C0BRA]

Actually don't have a set up at the moment, trying to find my old 97 but can't seem to track the guy down.

Sent from my SAMSUNG-SM-G935A using the svtperformance.com mobile app

 

[98 svt]

Actually don't have a set up at the moment, trying to find my old 97 but can't seem to track the guy down.

Sent from my SAMSUNG-SM-G935A using the svtperformance.com mobile app

Did you have a turbo/t45 setup?

 

[BLACK97C0BRA]

No, I haven't ever personally had one. I know a few that have but it's all an opinion. Loads of people go back to 327s after a turbo set up and they say it's the only way to go.

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[busta]

Years ago I had a '97 Cobra with a Hellion 62mm turbo kit. I swapped 4.10's for 3.27's and loved it on the street.

 

[nxhappy]

under 4.10s for sure. 373 might be ok or 355. Just have to have a good/wide ass tire.

 

[98 svt]

Years ago I had a '97 Cobra with a Hellion 62mm turbo kit. I swapped 4.10's for 3.27's and loved it on the street.

Was there any point you wished you went 3.55?
How much power/tq did you have?

 

[GNBRETT]

Turbo's love gear. 3.27 is wat u want. don't worry the TQ it will make will pull way harder with that gear

 

[busta]

Was there any point you wished you went 3.55?
How much power/tq did you have?

Nah - I thought 3.27's were perfect for me. It put down 505hp/456tq at the wheels on 10lbs.

 

[98 svt]

Nah - I thought 3.27's were perfect for me. It put down 505hp/456tq at the wheels on 10lbs.

That's pretty much where I want to be.
What size turbo? Plenty of low end grunt?

 

[Weather Man]

I ran 3.25 in my 9 inch with a 2007 TR-6060. It pulled very hard, I was at 707 RWHP.

 

[busta]

That's pretty much where I want to be.
What size turbo? Plenty of low end grunt?

Just a lil 62 it kicked. Brake boosting was also a blast.

 

[98 svt]

Just a lil 62 it kicked. Brake boosting was also a blast.

Stock compression?

 

[busta]

I believe it was 8.5:1 I had a stock shortblock out of an '03 Cobra.

 

[98 svt]

Yeah 8.5
Mine is 10.1:1 It needs to be looked at first before anything else, I may change the compression if it needs new pistons.