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ok first ill give some info on both verts....both are 8"the coan was built for a W2 340 it has a negative fin angle(around 100-150 degree)5500stall behind my new combo stroker indy SB.
the ptc was built for a stroker BB +250 fin angle unported stator 5400stall behind the same combo as above.
the coan is 10yrs old been behind several combos the ptc is bacially new.i lost almost a full 10th in 60ft with the ptc bacially 1.5ths on the top with same mph and rpm trap(same slippage).i bought the ptc because i wanted to use NOS figured it should be tighter but dissapointed.

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ok first ill give some info on both verts....both are 8"the coan was built for a W2 340 it has a negative fin angle(around 100-150 degree)5500stall behind my new combo stroker indy SB.
the ptc was built for a stroker BB +250 fin angle unported stator 5400stall behind the same combo as above.
the coan is 10yrs old been behind several combos the ptc is bacially new.i lost almost a full 10th in 60ft with the ptc bacially 1.5ths on the top with same mph and rpm trap(same slippage).i bought the ptc because i wanted to use NOS figured it should be tighter but dissapointed.

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Was the PTC built by them for your new combo? Or was "the ptc was built for a stroker BB +250 fin angle" that someone elses combo?

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I only looked at this topic because I know many members on here use PTC converters and love them saying they are top notch. So I was interested in your results but I agree with everyone as they are 2 different animals. I use Dynamic and TA but it seems about 99% of the PTC users are happy from what I hear. Ron

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Never had a PTC , but I'll say if you got a good convertor from Coan and it's for a Torqueflite you are very lucky. Maybe they just like screwing local people. Sorry

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One thing, that most people tend to overlook, is that a converter is not an exact science. You may get two supposedly identical converters from two different companies and they act totally different. You may even get two from the SAME company that act different. Like I said, they are not an exact science and two different people, read the same build sheet, there could be some differences, as a lot of the fin work, is done by hand.

The chances of getting the "PERFECT" converter, the first time, from ANY company, are slim, but most don't have a lot lying around to try, to determine this.

Does PTC make a quality converter...yes they do.....does Coan make a quality converter....yes they do. Just because one is faster than the other, does not mean it is a better converter, it just means it suits your combo better than the other.

I can't speak for Coan, because I don't know their policy, but I believe that PTC offers one, free stall change, within a reasonable amount of time, with every new converter they sell, because even they know, you don't get it perfect every time.

I use PTC converters in our drag radial car. We have (3) bolt together converters and (6) stators and every combination of them has been in the car at one time or another. Thats how often we swap converters, looking for the proper one, for given weather and track conditions.

Monte

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One thing, that most people tend to overlook, is that a converter is not an exact science. You may get two supposedly identical converters from two different companies and they act totally different. You may even get two from the SAME company that act different. Like I said, they are not an exact science and two different people, read the same build sheet, there could be some differences, as a lot of the fin work, is done by hand.

The chances of getting the "PERFECT" converter, the first time, from ANY company, are slim, but most don't have a lot lying around to try, to determine this.

Does PTC make a quality converter...yes they do.....does Coan make a quality converter....yes they do. Just because one is faster than the other, does not mean it is a better converter, it just means it suits your combo better than the other.

I can't speak for Coan, because I don't know their policy, but I believe that PTC offers one, free stall change, within a reasonable amount of time, with every new converter they sell, because even they know, you don't get it perfect every time.

I use PTC converters in our drag radial car. We have (3) bolt together converters and (6) stators and every combination of them has been in the car at one time or another. Thats how often we swap converters, looking for the proper one, for given weather and track conditions.

Monte

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lets say the track is cold and not so good what changes would you make to the converter to make it better? can you share that?

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A looser converter, lets the motor flash a little higher, BEFORE, it grabs the motor. This keeps wheelspeed down early in the run. It may not be much, but on the type cars that I deal with, letting the car roll out that extra split second, before the converter grabs the motor and really puts the power down, can make all the difference. Its all about power management

Monte

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thanks what did you guys do down track? what it looked like to me was an initial hook (on some cars) track loose and getting better down track. or just the boost comming in on the turbos thanks for your time Monte

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I just thought of a fun little experiment to see who makes the best converters. Could be done kinda like an engine masters thing. Get 5 fairly different proven combos of cars even different brands and have one converter sent from each converter maker for each car then get to racing and swapping converters and see whos run faster on average the first time out

Also be fun to do a camshaft competition in a similar format and compare cams from different makers useing their recomendations.

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Ok guys first let me clarify something.....i never expected one to outperform the other i actually figured the ptc would be slower because it was built tighter.my grievence is a tighter built conv(ptc)has the same amount of slippage the looser built(coan).

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back when i had some money, i bought a PTC and a spragless from TCT at the same time. they ran exactally the same.

TC are one of those things where i wish i could buy 5 different converters and try them all. I now have one from Ultimate

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im happy with TCT

3 freakin tenths happy

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I just thought of a fun little experiment to see who makes the best converters. Could be done kinda like an engine masters thing. Get 5 fairly different proven combos of cars even different brands and have one converter sent from each converter maker for each car then get to racing and swapping converters and see whos run faster on average the first time out

Also be fun to do a camshaft competition in a similar format and compare cams from different makers useing their recomendations.

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I doubt too many converter companies would volunteer for this one.Too much downside for all of them.

I agree on the cam comparison though.IT has been done before but not usually an apples to apples comparison.

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Ok guys first let me clarify something.....i never expected one to outperform the other i actually figured the ptc would be slower because it was built tighter.my grievence is a tighter built conv(ptc)has the same amount of slippage the looser built(coan).

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Once again i bought the ptc on the pretense that it would work for me as a NOS conv.i spoke with [Email]kenny@ptc[/Email] because i had a choice of 3different 8"ptc verts at the time this one seem to fit the bill for the power adder deal.i guess i should have worded the post a little differently because it wasnt a apples to apples comparison just somewhat dissapointed that the "tight"conv has that much slippage i was expecting btw 4-6%.im thinking of sending the coan to ultimate for a tuneup and maybe the ptc back to kenny for an adjustment.Nick

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Did you try this conv with the nos to see if it
tightened up on slippage... big difference between
using nos or not... I'm wondering if using the nos
it would decrease the clearance to tighten up the
fin clearance due to the added torque and heat

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back when i had some money, i bought a PTC and a spragless from TCT at the same time. they ran exactally the same.

TC are one of those things where i wish i could buy 5 different converters and try them all. I now have one from Ultimate

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im happy with TCT

3 freakin tenths happy

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You need to have a converter, built to YOUR specs, by someone. Again, I don't know Coan policy, but I know PTC will take their own converters in on trade

Monte

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Kenny actually took a Coan 10-blower convertor that he intially repaired and converted to spragless on trade for me a couple of years ago when I changed from Lencodrive to Bruno/Lenco. Don't race as often as most of you guys but its lasted 3 years behind a B/Alky 557 with just a freshen up last year. No complaints with PTC.

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I am only talking a max of 200hp shot that is why i figured a tight 8"with about 4-6%slip should work.this conv is supposed to be one of their tightest 8"s and works out to be over 10%slip thats why im dissapointed.ive ran dynamic,TA,A-1,ATI and have had good results with all of those and the coan.TCI and PTC so far in my experience no.Monte how much more do you figure a 200shot will push the converter?my thinking is this ptc might be too loose.......

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