What Et improvements have you guys seen when going from a wet sump to a dry-sump.. my wet Sump System pulled 13in of vacuum

Depends on how well you have the engine sealed up and on your ring seal.

Also depends on the pan, stroke length and how much vacuum you can pull.

Whose system did you buy?

C line oil pan

Small displacement vs. crankcase air volume between the oil level and the bores will get less benefit than the reverse, V8/V6 more benefit than L6.
Is there a place to hide a tall narrow cylinder to de-aerate the return oil? The return entrance to the tank is frequently a tangent (entering by joining the curvature, not going straight in or down) to promote swirl.

Whose system did you buy? [/quote] a daily 5 stage pump a Steph's 9 quart tank. C.line
AKA 562 fabrication oil pan

I think it will pick up a lot if you can find a old Orndorff and Eckman oil(and nitrous) tank

I agree with poly...you are getting to the point of diminishing returns.

The good news is oil control will be better and that equals some HP. As to how much more HP you will gain from more than 13 inches of vacuum it will be some but probably not more than 10 or so.

I don't know your displacement and I'm not sure if you are running a crank scraper. You may want to call Kevin Johnson at Ishahara-Johnson cranks scrapers. Not only can he tell you if he thinks a scraper will help he is a sharp guy when it comes to oil issues.

I agreed with what has been said.. I'm not anticipating much of a horsepower increase especially on the dyno.. My question was ET improvements.. from wet sump to dry sump..

you know as well as I do there are enough rumors already concerning me using nitrous.. maybe it's time to give it a shot

I think Bret could tell you exactly what you will see.

What pan & pump do you currently use ? Do you use a vacuum pump ? How much vacuum does it pull at idle and shift point ?

an old-school Charley 10 quart pan with a Daily 3 stage wet vac that would pull 13 in of vacuum at wide open throttle and 8in at idle..

IMO I have seen back to back testing in two NA 10.5 cars with an SB2, the other a SB Ford. Car ran exactly the same with a wet sump as it did with a dry sump, ZERO change in ET on this car. It was done in an attempt to get the weight penalty for a dry sump removed from the rule book. Having said that the rule is still there, juts lowered the amount of a penalty for a dry sump. FWIW we would love to run a Dry Sump in the Vette but there simply is no room to do it. We pull 17" with the wet sump deal now.

Thanks for the replies.. not exactly what I wanted to hear but it is what it is I was under the impression that I would probably see an improvement in 60 foot.. because the motor wouldn't be chopping the oil in the oil pan.. but I guess if it runs the same but oils better it's a win-win

Its only money. LOL.

What oil pan were you running with the wet sump setup and is it for sale im looking for a oil pan

i have to keep because rules change all the time..

The inside of a racing pan at work is a F5 tornado, and different with every variable:
crankcase design
solid or ventilated MB bulkheads
RPM
G force
car's attitude during launch
hot oil viscosity
where does the relief valve dump to
pump flow in GPM
how far away is the bottom of the CWT from the pan
any control measures: baffles, scraper, dams, trap doors.
Even a proven one from a similar engine may not work the same way in your (better or worse).
Kevin Johnson knows everything.

Dry sump is a better system, you may or may not see any ET. Depends on how good your old system was and how much oi, you ran in the pan. The vette we have 6 quarts in it for the wet sump with a very good pan and pump. The SB2 deal I spoke of I know very well. And he saw not change on the track but it had a very good wet sump pulling 20" of vacuum so he gained nothing in the switch. It was similar to yours using an external wet sump pump as well. If you old wet sump pan was not great and you ran a lot of oil you may well find some 60' with it. The two cars I refer to were very well science out wet sumps to be sure with not a lot of oil volume. I know I mentioned it to you but we say about a 10hp loss from having to have TO MUCH oil in the pan on the dyno due to the new block being different and we needed to work on drainback with it.