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what ratio in turbo 250xflow

7 posts in this topic

Hi guys

As the title suggests, got a bw LSD with 2.9 gears at the moment, have a 250xflow turbo c4 gearbox with 2500 stall 
looking to go either 3.23 or 3.45 what would best suit the turbo engine ? 

cheers

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Hi guys

 

As the title suggests, got a bw LSD with 2.9 gears at the moment, have a 250xflow turbo c4 gearbox with 2500 stall 

looking to go either 3.23 or 3.45 what would best suit the turbo engine ? 

cheers

 

I would think 3.45s to be too short for something without an overdrive box. 3.23 would have it singing a bit on the freeway too but depends on your priorities. I'm going back down from 3.27s because manual and cruiser. 4th gear (1:1) in mine has about 2900 up at 110 K's. Yours would be more with converter slippage.

 

Sent from my CPH1607 using Tapatalk

 

 

 

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i would say depends on the cam. and rev limit. and when the boost comes on.. 

i'd try 3.23 because they are common and cheap.. get one, bolt it in.. try it. if it's too slow to get the 3.45
 

 

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also don't rule out the 2.92 depending on the combo also.. i've seen some turbo 250s running the 2.92 and they pull like a train with a smaller turbo making boost early

gerg likes this

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also don't rule out the 2.92 depending on the combo also.. i've seen some turbo 250s running the 2.92 and they pull like a train with a smaller turbo making boost early
Yeah I was thinking this too. Turbos make torque so taller gears might work even better than with N/A. That 2500 converter is already fairly high for a street-friendly crossy.

Sent from my CPH1607 using Tapatalk

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Its got a fairly lumpy cam un sure on specs. It pulls like crazy on boost but just feels real sluggish untill it gets there. Might try 3.23 to waken it up a tiny bit and hopefully not lose that pull it has up top. Its a crossflow after all only revs to 5ish on a good day haha

deankdx likes this

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