Converter multiplication ?
 

I was talking converters to a few guys and they said that I should have told ATI my converter was going in a super stock car as they do some thing different to the multiplication in the converter. Any thought on this? Also, said to check out ultimate converter. Anybody using them and any thoughts or opinions over ATI?

Re: Converter multiplication ?
 

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.

Re: Converter multiplication ?
 

I did have them set it up for my combo with all specs. I was told that they had a little different set up for super stock and was wondering if it would get a better 60'. I have a 5500 stall in it and I feel it doesnt leave hard at all. I am used to sticks thought. Here is the best pass so far.
http://www.youtube.com/watch?v=mIbfedEtrWw

Re: Converter multiplication ?
 

It looks soft, but without knowing more, it's hard to say why.

Re: Converter multiplication ?
 

L79racer,

Talk to Lenny @ Ultimate Convertor , does a great job & his convertors really work .... You would be surprised at how many racers are using his stuff ... Lenny is also very easy to work with and very dependable .... Call him, you won't be Sorry ....
704-892-6837 .......

Re: Converter multiplication ?
 

I also like Lennie at Ultimate. A good Guy doing a good job.

In the Video I see a 1.40 sixty foot on the board. For reference, my Firebird does a 1.37 sixty foot with a 9.70 ET so you are close.

Re: Converter multiplication ?
 

Why, that ain't no super stock car.

That said, none better IMO than ATI!

Those that think they are, I invite them to step up

The PROOF IS IN THE PERFORMANCE

http://i381.photobucket.com/albums/o...own11-7-10.jpg

3124 lbs. n/a and a best to date of 1.17 60 foot launched off the footbrake.

Re: Converter multiplication ?
 

Larry, are you running a glide? I have a glide and always felt the glide was hurting the 60' a little bit. That run was in great air. It usually will go low 10 teens to 10.0's with a 1.43 60' depending on the air.

Re: Converter multiplication ?
 

yes I know its not a SS car but looking to get it to leave a little better. What ET and MPH are you running? Can you post some more specs on your car? I like ATI, no complaints, just curious of the info I was hearing.

Re: Converter multiplication ?
 

If you have questions as to whether your current converter is optimum for your combo speak to Charlie Plott at ATI.

Be prepared to provide him with factual data, including but not limited to what does the converter flash to on launch, what RPM does it fall back to on the gear change(s) and what RPM is it crossing the stripe at and the only way you'll know this is with a playback tach or data logger.

As to my car's specs...

522 BBC, turbo400, 4.57 gear.

http://i381.photobucket.com/albums/o...atsengine3.jpg

Slowed to run low 9.0's all season long at near 150

http://i381.photobucket.com/albums/o...cketFinals.jpg

More importantly what are the specs of your car/combo?

Re: Converter multiplication ?
 

Pump gas 383, glide with a 1.80 gear set, 5500 stall and 4.56 rear with a 29" slick and or a 295 drag radial. I shift at 7200 and run through at about 7000. That T400 gets you going with the bigger 1st gear.

Re: Converter multiplication ?
 

If you think a turbo 400 "gets you going with the bigger 1st gear" why aren't you running one?

what is the best and average ET, MPH and 60 foot and at what weight? Also how many passes on this combo as it now?

Need all the details of the car/combo to determine if it's running near optimum and if the converter is right.

The devil is in the details and if the combo is mismatched, you'll never get the 60 foots you're looking for regardless of whose converter is behind that engine.

Did you read this...

Re: Converter multiplication ?
 

Well as the T- 400 goes. It weighs more than the glide and uses more HP to turn. So they say you will be faster with a glide but will not 60' as good as a 350 or 400. This is my first automatic so I'm still learning. I did speak to Ati when getting my converter and did tell them all the details and specs and I have what they speced for me. Dont get me wrong, I am not saying that I dont have the right converter. I was just stating that a few other racers said I should have told ATI it was for a super stock car and they would have done something different to the multiplication in the converter. I was wondering if there was any truth to this. I'm at 2900 lbs race ready. For what I have and run its pretty damn near close. Just felt it leaves soft. I'm sure a little more gear or 28"slick would pick it up a bit. I ran it all last season and made about 50 passes with it.

Re: Converter multiplication ?
 

how big are the heads, what is the cam @ .050, what intake manifold and what carb?

Re: Converter multiplication ?
 

195 comp. ported AFR heads solid roller 2.58 / 2.65@ 50 Victor Jr. 2" spacer with a hp 950 Just under 11.1 compression. 1 3/4 headers

Re: Converter multiplication ?
 

You don't have enough gear, nor do you have enough low gear in the transmission. You don't need to try to "fudge" anything by telling them you're putting it behind a Super Stock engine, besides, when you give them the specs, they'll know. You need a 4.88 or a 5.13, and about a 1.90 low gear.

Re: Converter multiplication ?
 

Thanks for your input. I will be trying a 28" tire to see how it likes it and what rpm it will be at crossing the big end. If it likes it, I will go to the 4.88 and 29" tire.

Re: Converter multiplication ?
 

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

http://i381.photobucket.com/albums/o...cketFinals.jpg

Re: Converter multiplication ?
 

Thanks for your input also. I will try the shorter tire to see if it likes it. Then add more gear if it does.

Re: Converter multiplication ?
 

One more question. If I change the gears to 4.88 and it leaves harder will I not see a big increase in the top end rpm because I would get there quicker? I dont want to be spining it higher than 7400 up top.

Re: Converter multiplication ?
 

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

Re: Converter multiplication ?
 

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!!

Re: Converter multiplication ?
 

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.

Re: Converter multiplication ?
 

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.

Re: Converter multiplication ?
 

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.

Re: Converter multiplication ?
 

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.

Re: Converter multiplication ?
 

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

http://i381.photobucket.com/albums/o...aker/th_10.jpg

http://i381.photobucket.com/albums/o...07pass2007.jpg

http://i381.photobucket.com/albums/o...DSC00693-1.jpg

Re: Converter multiplication ?
 

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.

Re: Converter multiplication ?
 

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.

Re: Converter multiplication ?
 

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.

Re: Converter multiplication ?
 

X2, Got to agree with ED there

Charlie Plott was the only one who could get my converter right a while ago, They kept it @ 4200-4400

Charlie looked at it and mentioned some ss cars, took the converter @ no charge and brought it back and said its loose enough and has the proper stator now

When in doubt ask for Charlie and if he is busy leave a message

One of the nicest guys out there. Art is the one who specd it @ 4200-4400

Re: Converter multiplication ?
 

I had a problem with one ART did, all others have been dead on