Re: Turbo 250 or 350
 

Didn't Keith Lynch Run A Metric 200 or 250 something behind his 375 -- 396 B/SA with a steady diet of Royal Purple and it worked like a swiss watch? I think that it might have been a Scott McClay piece.

Re: Turbo 250 or 350
 

350 with 250 shafts and drums, lightens them up almost 10 pounds, cut some off thepump so its a little less volume, cheap and effective. Told it can be worth over 10hp at the wheels with a small block, but haven't yet tested it myself. Don't worry about rpm.

Re: Turbo 250 or 350
 

A coupla things--- I am NOT A TRANS EXPERT----Only telling you what I have observed/heard in the pits!!!! Guys like Keith Lynch I will bet do lotsa maintainence on their cars and they have these cars apart and back together monitering their equiptment and doing preventative work to keep them in tip top shape---

If you ever saw the inside of a McClay 200 compared to a stock trans you would understand why he gets as much as he does for a trans!!!! Lotsa hand made or reworked beefed up parts in them very little stock stuff---

Some racers put a trans in and run it for a whole season or 2 and never even change the fluid or filters while others have em apart every so many runs--- whatever works BEST with/for your combo is what you should run--Don't be afraid to experiment!!--Look around you and see what a racer with a combo like yours is using ,ask lots of questions ,talk to the really reputable trans/convertor guys most will point you in the right direction while some will tell you anything to sell you something. Nobody is gonna give you their deep dark secrets but many will help you get close in performance.

Re: Turbo 250 or 350
 

The 250 forward input drum is a lock up drum, and is the same as a 350 forward input drum. The 250 direct drum has no sprag, you cannot use it in a 350 or you will not have 2nd gear.

The output shaft from a 250 is "gun drilled" and slightly lighter. The sun gear shell from a 250 is "swiss cheesed" and slightly lighter. Combine them with an ATI aluminum forward input drum and an ATI aluminum direct drum and you have a light 350.

Re: Turbo 250 or 350
 

These are probably some of the best words I've heard. This has turned into an interesting thread. What it will do for me? Lead me to do more investigation. For those of us, yet to make it to the track. Discussions like these yield a lot of information to help with future decisions.

Still going with a T-350 to start with.

Re: Turbo 250 or 350
 

Robert, the box I described runs in the 427/425 Camaro in A or AA for two years and hundreds of passes. Looks as good when it comes out as it does going in. I freshen it purely out of guilt.

Re: Turbo 250 or 350
 

I've run a Coan 350 for a little over a season now. Although I had to redo a few things in it after 70 runs tore down and everything looks good. Of course I have no real power but do give it some RPM shift @ 9800, near 10.000 at the stripe. So I'd say RPM is not an issue. Good luck with what ever you chose. Joe

Re: Turbo 250 or 350
 

How much quicker in a car like mine? Any 8 inch converter weights? Thanks

Re: Turbo 250 or 350
 

The only downside to a T350 (besides the rotating mass) is whenever first gear is under power, second gear is turning the incorrect direction (ie in reverse). Therefore when the 1-2 shift is made second gear must stop rotating and reverse direction (to the forward direction). A secondary impact to this is when in first gear over a certian RPM (6XXX +, each one is different) the second gear clutches will start to drag, and when they are rotating in the opposite direction it has a tendancy to kill ET.

With all that being said, the reverse rotation, the stop, and the sudden forward acceleration of second gear could have negative consequences to the durability of a T350 trans it is consistantly over-reved. However most racers I know use 1st gear only to get the car moving and shift to 2nd very early.

It has also been our experience that shifting 1-2 early does not negatively affect ET to the same extend shifting late does.

I hope I got that all right.

Re: Turbo 250 or 350
 

Does the metric 200 function different? Any 8 inch converter weights?