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PTC vs COAN results
Posted By: KOS
PTC vs COAN results - 11/25/10 12:24 AM
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.
Posted By: Challenger 1
Re: PTC vs COAN results - 11/25/10 12:49 AM
The Coan converters that I have used, have been top notch. I have bought 2-727 and 2 powerglides from em also, none of them have ever broke. Great people imo.
Posted By: old yeller
Re: PTC vs COAN results - 11/25/10 12:51 AM
All i can say is i bought my coan(nos converter)from muscle motors over 8 years ago,and its still in the bird,i had it sent out when i blew up the tranny at orlando...everything was still good when they sent it back to me.(it was a $150.00 to cut it open and weld it back up)..i also have friends that run PTC converters and are happy with them.
Quote:
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.
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?
Love my Coan!!
Posted By: MegaDart
Re: PTC vs COAN results - 11/25/10 01:15 AM
you can't compare apples to oranges.
you took a stab in the dark and bought a ptc convertor that was not built for your combo and are disappointed it's not faster??
it just might be better then your coan on NOS
Posted By: Leon441
Re: PTC vs COAN results - 11/25/10 01:18 AM
Your PTC may very well be a peice of crap.
BUT, these converters are not anyway shape or form the same converter. By your own admission you ordered the converters for different combo's.
Posted By: KOS
Re: PTC vs COAN results - 11/25/10 01:24 AM
Yes i understand what everybody is saying but wouldnt you think the ptc would have less slippage?
Posted By: KOS
Re: PTC vs COAN results - 11/25/10 01:27 AM
Quote:
Quote:
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.
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?
they where both built for different combos.....my complaint is the slippage of the ptc.it is equal to the coan which is 11%last time i did the math.
Posted By: BobR
Re: PTC vs COAN results - 11/25/10 01:31 AM
we went from a Chance to a PTC. You simply cannot hit and miss if you expect to get the perfect converter.
Posted By: KOS
Re: PTC vs COAN results - 11/25/10 01:49 AM
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).
Posted By: 383man
Re: PTC vs COAN results - 11/25/10 02:15 AM
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
Posted By: jimmysarrow
Re: PTC vs COAN results - 11/25/10 02:17 AM
I have run both Coan and PTC , with good results from Both. I have had PTC for last 5 years. Call Kenny @ PTC , he will get you fixed.
Posted By: KOS
Re: PTC vs COAN results - 11/25/10 02:21 AM
Quote:
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
383 man read my last post........
Posted By: bigdad
Re: PTC vs COAN results - 11/25/10 02:29 AM
I have a PTC .. Meh'
jury is still out
Posted By: 65dragnet
Re: PTC vs COAN results - 11/25/10 02:57 AM
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
Posted By: 71440dart
Re: PTC vs COAN results - 11/25/10 03:15 AM
Quote:
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
i remember my 5500 stall coan pushing through the front tires at 2200 rpm, my ptc 4500 is easy to hold at 3k, and picked up .08 60 foot consistantly.
Posted By: MRMOPAR
Re: PTC vs COAN results - 11/25/10 06:07 AM
i bought a 9" PTC AFTER consulting with them on my combo, and after hearing all the "rave" reviews here. It replaced a 9" Dynamic that was also built for my combo. I lost MPH and ET in the 1/4 with the PTC. The PTC showed almost 11% slip vs 4% for the Dynamic - that data was derived from my QwikData logger, measuring the engine and driveshaft RPM. The Dynamic is back in the car, and the ETs picked back up. My experience and
Posted By: MOPARCHAS
Re: PTC vs COAN results - 11/25/10 02:27 PM
I think PTC works great got it from John at CRT
Posted By: sixpackgut
Re: PTC vs COAN results - 11/25/10 03:18 PM
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
Posted By: Big Squeeze
Re: PTC vs COAN results - 11/25/10 04:13 PM
I bought my first and only Coan back in the early 90's for a 13 second 383 Roadrunner........Paid over $500, put it in, drove it around the block, hammered on it a few times, and broke it......When I first stall tested it, it would go to 4,200........After hammering on it for about 10 minutes, it made a huge "thunk" sound.......I thought the driveshaft came out.......after that it would only stall to about 2,200........I pulled it out and the stator splines were split and shattered..........I called them to explain what happened and their very sarcastic response was; "That converter isn't for a B1 motor".........
Posted By: MoparPitBull
Re: PTC vs COAN results - 11/25/10 05:09 PM
Coan here,been in the car since 05 with no issues at all.Must not be puttin enough power to it.
Posted By: Monte_Smith
Re: PTC vs COAN results - 11/25/10 05:31 PM
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
Posted By: smokinwoody
Re: PTC vs COAN results - 11/25/10 06:49 PM
as usual...so well said Monte...
PTC converter here
had a HUghes and didnt like it at all
these were not off the shelf converters but designed for the application...as Monte stated it isnt exact science but at least when you tell em what your combinations are or what you have...theres no telling how close the converters will be..
Posted By: Quicktree
Re: PTC vs COAN results - 11/25/10 07:16 PM
Quote:
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
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?
Posted By: Monte_Smith
Re: PTC vs COAN results - 11/25/10 07:25 PM
Quote:
Quote:
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
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?
Depending on the car, you could put a looser converter in, to let the motor make rpm, but not lock the converter so early and keep wheel speed down early.
But you also have to be aware of the situation WE got into at Gainesville. It was so cool and the air was so good, that the car was making stupid power, plus it was a decent, but very cool track, making conditions very tough. I did not get enough runs, to be able to calm the car enough, power wise, to get it down on those small tires.
The Pro-Mods also struggled, to get up on the tire, because the starting line was so good, but by 60ft, the track was cold. VERY tough conditions for high HP cars.
Monte
Posted By: Quicktree
Re: PTC vs COAN results - 11/25/10 07:30 PM
are you saying you want the tires to spin a little with the loose converter? getting it up on the tire quicker? the bracket rascer in me says to tighten it to maybe ease the tire spin. if you were bracket racing would that be correct? thanks Monte I think you guys did pretty good dealing with those conditions.
Posted By: Monte_Smith
Re: PTC vs COAN results - 11/25/10 07:37 PM
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
Posted By: Quicktree
Re: PTC vs COAN results - 11/25/10 07:47 PM
Quote:
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
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
Posted By: HotRodDave
Re: PTC vs COAN results - 11/25/10 08:26 PM
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.
Posted By: Quicktree
Re: PTC vs COAN results - 11/25/10 08:40 PM
Quote:
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.
I doubt that would prove which is the best. like Monte said it's a matter of who gets it the closest the first try. there are many quality converters but very few that can take numbers and build a converter thats right the first try. and really there is know way of knowing if it can't be improved on whith an adjustment. it's not an exact science, people usally guess what kind of power and torque they are making or get bad dyno numbers that causes problems.
Posted By: KOS
Re: PTC vs COAN results - 11/26/10 11:34 AM
Quote:
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).
Once again i bought the ptc on the pretense that it would work for me as a NOS conv.i spoke with kenny@ptc 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
Posted By: 493_DART
Re: PTC vs COAN results - 11/26/10 12:33 PM
Quote:
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
im happy with TCT
3 freakin tenths happy 
Posted By: gch
Re: PTC vs COAN results - 11/26/10 02:55 PM
Quote:
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.
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.
Posted By: MR_P_BODY
Re: PTC vs COAN results - 11/26/10 03:59 PM
Quote:
Quote:
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).
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
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
Posted By: Monte_Smith
Re: PTC vs COAN results - 11/26/10 05:38 PM
Ok...Let me start by saying, I don't work at PTC, nor am I a converter expert, but I have sold or given specs for countless nitrous converters. If an 8" converter, was built by PTC, to go behind a stroker big block, I could nearly guarantee, that there was NO mention of any nitrous being put on that motor originally. An 8" converter, is just NOT what you build for a squeezed big block. Now if you talked to Kenny and he suggested that one, based on the 3 choices you had, that just likely means it is the tighest of that group, but not what the car really needed. You can only make an 8" converter so tight.
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
Posted By: KOS
Re: PTC vs COAN results - 11/27/10 06:54 AM
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.......
Posted By: sixpackgut
Re: PTC vs COAN results - 11/27/10 07:24 AM
Quote:
Quote:
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
im happy with TCT
3 freakin tenths happy
i'm happy it went to a good home
Posted By: 23T Hemmee
Re: PTC vs COAN results - 11/27/10 08:55 PM
Quote:
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
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.
Posted By: Monte_Smith
Re: PTC vs COAN results - 11/27/10 10:08 PM
Quote:
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.......
Not so much the hp of spray you are adding, it is the added torque. Myself, I would never spec an 8" converter for any nitrous combo, unless it was a very small shot, on a very light car.
Monte
Posted By: KOS
Re: PTC vs COAN results - 11/28/10 08:07 AM
gotcha thx