Converter multiplication ?

[1320racer]

you'll be turning 2-300 more RPM in the lights than you are now

[L79racer]

Originally Posted by 1320racer

2" spacer equals too much plenum volume which helps to kill the launch though and the cam is too big at .050.

That said, the quick fix is more gear or a 3 speed trans and a shorter tire.

Here's an example of a 3160 lb. footbrake launched ride slowed every week to run low 10.0s with a sbc under the hood backed by a 1.80 1st gear glide that leaves with a best 60 foot to date of 1.27 and has run 9.77 @ 138+ with a manifold having less plenum volume than yours and no 2" spacer

What size motor, converter, rear gear, shift rpm and trap rpm. From that 60' I'm not even in the ball park. What carb and manifold is on it? If its top secret stuff PM me. LOL!!

[1320racer]

Originally Posted by l79racer

what size motor, converter, rear gear, shift rpm and trap rpm. From that 60' i'm not even in the ball park. What carb and manifold is on it? If its top secret stuff pm me. Lol!!

400, 10" 4.56, 7300, 7500, old school 830/4150, Brodix/HVH. The converter and carb were not selected for optimum 60 foots, ETs and MPH.

[L79racer]

Originally Posted by 1320racer

400, 10" 4.56, 7300, 7500, old school 830/4150, Brodix/HVH. The converter and carb were not selected for optimum 60 foots, ETs and MPH.

Whats the stall? Thats a good running car. I will try and run mine without the spacer and see if it helps. I'll be at Etown in a few weeks for the Corvette challenge and give it a shot.

[1320racer]

5600 and yes it is.

That said, you can't compare your car to this one that has been raced for nearly 25 years and has logged thousands of passes and has been tuned and tweaked to near perfection.

You can see it in person any Summit Series points day(Saturdays) at Island Dragway.

[K Stubbs]

Originally Posted by Alan Roehrich

Yes, ATI has a new stator for Super Stock. And yes, you have to tell them the exact combination, fill the spec sheet out completely, and tell them what you're doing, so they can get the converter right. You cannot expect them to guess or read your mind and get it right.

Actually you should send them the dyno sheet from "your" motor. They should ask you for this first before telling you exactly what you need. An off the shelf converter will just be a guess and filling out the form doesnt tell them how much HP your motor makes.

[1320racer]

ATI ain't ever seen a dyno sheet from any of my engines or for any of the converters that I have sold! What they got from me is accurate info/data and the results speak for themselves like my former 3880 lb ride that ran a best 60 foot of 1.28 and 10.07 @ 131 launched off the footbrake with a pump gas, cast iron oval port headed 468 under the hood backed by a turbo400 and 4.10 gear

[Alan Roehrich]

Originally Posted by K Stubbs

Actually you should send them the dyno sheet from "your" motor. They should ask you for this first before telling you exactly what you need. An off the shelf converter will just be a guess and filling out the form doesnt tell them how much HP your motor makes.

A dyno sheet is nice, but dynos lie. And you can't really race one. I've been selling converters for over 25 years, you do not have to have a dyno sheet. Believe me, they know what they're doing. I've sold probably 200 of their converters, and don't remember having one be too far off. There are no "off the shelf" race converters from ATI. Each one is custom built to an individual application, from all new parts.

[Adger Smith]

Alan,
I agree that a dyno can lie. The numbers are usually off from one to another. We ran a 555 the other day that was over 125 hp variation from the dyno it just came off and came to us. No excuses for it. running 2 days later in the very same air mass with the same headers. Just looked like a good salesmanship job by an "Name company" We have also had just the opposite happen. The two sheets matched real close.
Good converter shops know & can tell if you have a true dyno sheet.
Before we got our dyno Marv always ask us for the numbers over the phone. He was most interested in the 2 highet HP & TQ RPM's. How quick it "went over" (fell off) and who's dyno. He only commented once about the numbers.
Just said ugh! thats off 25 or 30....
I'm of the opinion if you have numbers share them with the converter shop. If not you should rely on their experience.

[K Stubbs]

I got mine from A1, they asked for a dyno sheet and got it. I will see how good it is but I have alot of confidence in it. Dyno sheets are important and so are the numbers on them. If they are bogus that will be a problem but they should have enough "sheets" to compare them to. What is more bogus is writing your info down and them "assuming" that your combo makes x amount of power. That is saying that every person with the same combo makes the same power. Doesnt mean that they cant get you in the ballpark or hit it right the first try, but numbers are important.