400inch motor + F1C + SDCE... thoughts/ opinons?

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01-07-2008, 02:57 PM

#41

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Quote:

Originally Posted by SDCE

Remember, when we made our tensioner system, F series blowers were not even available! Our tensioner system was designed as a fix for the average "street" cars using the P series and the D series blowers up to 1000HP. As far as not working with the F series making a ton of nut like you, KP, we see no reason it shouldn't work with a little extra R&D and testing. We haven't seen enough people in this range with severe belt slip issues to warrant modifications or a new tensioner design, but if you guys want it, we'll make it....the original SDCE tensioner is tried and true, and we can certainly handle the task of taking it to the next level. Assuming the 8 rib belts can stand up to it...

I agree 100%, the SDCE is the one of the reasons I'm still using a procharger and havent jumped ship to a turbo. It will certainly max out a D1SC with no problem with very little tension on the belt. I never implied the SDCE was flawed, you are just only going to go so far on an 8 rib belt.

Quote:

Originally Posted by SDCE

You probably know this already KP, but for those that want some insight, the slip you're seeing in first gear is from INSTANT ACCELERATION!! trans brake and stick cars are good for this. the engine goes from high rpm's to low rpm's instantly. At that point in time, the tensioner is physically on the wrong side of the belt. The blower is spinning faster than the engine -trying to "drive" it. If and when you want to mess with the C or the R KP, you let us know and we'll make sure our tensioner stands up to the task as long as the 8 rib belts will take it!

No doubt, even a 2 step at 3000rpm is hell on on the blower and crank. You have an engine bouncing between 2500 and 3000 rpm and I have watched the belt with the car on the 2 step and brake and its not pretty

But yea, you are going from 3000 to 5500rpm (converter flash) in the blink of an eye. After that the car sees from 6300 to 7300rpm and thats it. I would expect to see some slip in 1st gear, but you can see the bigger the blower the more pronounced it gets. But it really may not even be a bad thing, its pretty consistent ET-wise so it cant be that bad.

Quote:

Originally Posted by SDCE

As far as Cog drive, think of the same instant acceleration rate as discussed above - the rpm's still go from high to low instantly - all that energy still has to go somewhere...it just gets filtered thru the crank and the engine ultimately beating the hell out of it. (take a credit card and bend it back and forth...you can only do it so many times before it breaks) In our research and testing, cog systems didn't stand up to 450 or so HP, so we couldn't see how the hell it was going to stand up and last for any more than that?? UNLESS you're a professional race team and you can afford to replace your crank and/or engine on a regular basis, cog systems aren't very practical or efficient for the everyday racer.

I'm not a big fan of cogs for that reason, there is no 'give' and thats why you see a lot of cars with bigger centris go through belts like they are going out of style. But there are also some that go for a long time on a belt so a lot has to do with how its set up. Couple guys here had cog setups on the stock brackets and both of them didnt work well at all - they both switched to the SDCE. As far as me I have no plans of stepping it up. This car has far exceeded what I wanted it to do and this year I'll run the D1SC most of the time and just have some fun with it..