Im really trying to make my decision. I cant decide if I want the 3000-3200 278mm 2A converter for $395 or the 3000-3200 1c 245mm for $725. How much more will I gain with the 1c? How much better is it than the 278mm 2a?

 

i have the 3c 245 mm converter. its a 3800-4000 stall. and it has netted me a best of 1.57 50 foot. its a good converter. I would opt for that one instead of the one you are looking at. it was the same price as 725 I believe.
give the a call and talk to them, they will not steer you wrong. depends on what your goals are and your set up.

 

The Circle D Specialties 2C and 3C converters are very efficient and drive really nice on the street and ET well at the track. The difference between their 245mm custom billet converters and the 278mm is significant, especially if you spend much time at the track. If it's a street car that will rarely see track time then the 278mm is a good bang for the buck, but their 245mm converters are well worth the extra money IMO.

 

What are the advantages of the 245mm? Do they help better because they are lighter?

 

Basicly im trying to decide if it would be worth the extra money and how the 245mm is better. I take it to the track 4-5 times a year. I really just want the car to be faster anywhere though, so if the 245mm will be alot faster on the street to than I might want to go with it. So my main question is how much more will I gain in the 1/4 with the 245 than the 278? And for what reasons is the 245mm better? Does it rev faster? Is it more efficient up top?

 

The custom 245mm is built using a very nice custom billet front and it is much more efficient by design. The reduced rotating weight/mass is just another reason it is a better performer.

I would expect to see approximately a 3/10 difference in 1/4 mile ET between the 2 converters, but that will vary depending on your mods, weight and traction.

The 278mm is a good budget converter and you will notice a good improvement, but the properly matched 245mm custom converter will turn the car into a whole different animal. I hope this helps a bit. G/L.

 

Yea you have me almost completely convinced to go with the 245mm converter. So your saying I will get like 3 tenths better acceleration. Right? Say I get the the exact same stall speed as I was on the 278mm. It would hit about the same off the line, but it would accelerate 3 tenths quicker in the 1/4 mile? Because im not wanting to buy the 245mm to launch harder than the 278 I just want it to accerlate and make it quicker in the 1/4 with not just launching harder if that makes any since

 

The custom billet 245mm is much more efficient and will maintain more efficiency in all areas and is built to be a very durable unit. The 278mm TCs do work to get the car up closer to it's powerband so the stall rpm compared to stock is noticable in the SOTP (seat of the pants), but the 278s larger pump has to modified in a way to get the desired higher rpm stall that reduces it's efficiency in most cases. As mentioned before, the weight between the 2 is significant. Anytime you reduce rotationg mass on an engine, you are going to make more HP and the engine will rev easier.

With that said, the 278mm budget converters have their place in our LS1 performance world. In stock form, the A4 f-bodys sometimes have what I call a dead spot when trying to accellerate through traffic. The car is just below it's powerband and is basically a turd IMO. Also in stock form they often will not spin the tires from a dead stop unless the ground is wet. The 278mm converter will eliminate these issues and make the car much more fun to drive. There are a lot of people out there that don't want to spend a large amount of $$$ on modifications, never plan to go to the track or put sticky tires on their cars, but want it to feel peppy and pull better when you hit the go pedal. The 278mm would be for them.

For those that plan to continue modding and making their car go faster as time goes on and want great efficiency, significant ET improvements and maximum durability, then the Circle D Specilaties custom billet 245mm is the only way to go.

 

Great insight in this thread - Thanks to those who contributed

 

Definitely some good info. Any other questions just ask.

Chris

 

Thanks for all the help deciding Chris and TXCAMSS. I just bought the pro 2c!

 

Same questions 5 years later lol in current hp series pro 1