Old converter flashed to 5500, got new converter it flashes to 6400, shift at 6600. Ran car. It's faster. Change shift to 6800. Launch at 4600. Normally ran 6.18-6.20. Went 6.11. Should I leave it like it is or tighten it up. Doesn't seem to be quite as consistent now. But that was one race. Went 6.146,6.129,6.130,6.119,6.134. Feels like running high gear only it shifts so quick...lol

I would not make any changes to it after only 1 race. when you shifted at 6800 what did it fall back to? 6-700 RPM drop from the shift is usually the happy spot for consistency but also depends on your engines operating range for peak torque

Looser is almost always faster, raise the shift to 7K and see if it makes it more predictable. How much did it raise the RPM's at the stripe?

It fell back to 6400...at stripe it was 6800-6900... No data logger...just my eyeballs.

Leave it sounds like the car liked it

quote:

Originally posted by jay giles:
It fell back to 6400...at stripe it was 6800-6900... No data logger...just my eyeballs.

Move the shift to 7000 and see how it likes it.

Leave it.
Get more data.
Might be a couple of hun high, maybe not.

Get a camera on the tach.
75 % of the TC in use are too tight, but nobody wants to try to change things, because it is too much work to pull a converter, and costs to make changes, but will buy another cam or heads.

Why do you want to tighten it? If you think it lost consistency, why did it? My experience has been that a converter that is a tad too loose is generally more consistent even if not the fastest.

I would shift it later...possibly on time.

Next time I'll shift at 7k...at the moment don't have equipment to shift on time.

There always that old thing for shifting,hand. I know its not popular but it works. If married its probably stronger.LMAO

As for converter.Everyone tells me loose is better for Bracket car and if its consistent do not change it. Just what I hear.

quote:

Originally posted by Bucky:
Why do you want to tighten it? If you think it lost consistency, why did it? My experience has been that a converter that is a tad too loose is generally more consistent even if not the fastest.

What he said ...

Here's a thought: I always order my TC on the loose side. If I go through the traps at 7500 rpm (too much for my bracket car) , I change out 4-6 qts of my trans fluid to hydraulic oil and that will tighten it up about 500 rpm. If that's too tight, I change out 3 qts of my "hybrid" trans fluid back to regular trans fluid and that will loosen it up 200 rpm or so, a lot easier than changing out the TC.

Ran it last night....first pass shifted at 7k...but didn't realize had 7k high side chip...so it hit it a little...ran 6.119. Changed chip..then ran 6.105,6.093,6.100(spun) then 6.092...think I'll leave it.

quote:

Originally posted by jay giles:
Ran it last night....first pass shifted at 7k...but didn't realize had 7k high side chip...so it hit it a little...ran 6.119. Changed chip..then ran 6.105,6.093,6.100(spun) then 6.092...think I'll leave it.

I would too, good deal!

good decision,lol

That's great news!

quote:

Here's a thought: I always order my TC on the loose side. If I go through the traps at 7500 rpm (too much for my bracket car) , I change out 4-6 qts of my trans fluid to hydraulic oil and that will tighten it up about 500 rpm. If that's too tight, I change out 3 qts of my "hybrid" trans fluid back to regular trans fluid and that will loosen it up 200 rpm or so, a lot easier than changing out the TC.

Really? I never seen nearly that much difference with 10wt Hydro oil.
We have a pretty loose converter now which works pretty good - but I'd really like to lower our top end RPMs about 200 was thinking a larger tire - but would have to make the room for them. Anyone else see much RPM change with hydraulic oil.

Hydraulic oil will tighten the flash point of the converter. Putting a larger tire on it generally wont help finish line rpm as the converter will show more slip.


Typically we like a loose converter for bracket racing. You will give up a lil et sometimes but the consistency is worth it.


Greg

quote:

Hydraulic oil will tighten the flash point of the converter. Putting a larger tire on it generally wont help finish line rpm as the converter will show more slip.

interesting will the heavier oil lower the down track much or mainly the flash?