Nitrous converter shift drop

whats the ideal rpm shift drop need to be ? mine drops right at a 1000 rpms . i feel the comverter is a tad tight, my car went 4 hundreds faster on a 28 tire than a 29.5 tire , maybe because of the gear ratio change

That may be a tad much. Either loosen it up or spray more.

As far as your car slowing down, what are the incremental differences?

every combo is different, but it does sound a little tight...

either spray it more or have it loosened a tad.......... what brand and size converter?

X3 for spraying it harder.....

richter69 wrote:every combo is different, but it does sound a little tight...

either spray it more or have it loosened a tad.......... what brand and size converter?

its a 9.5 PTC with a 12 blade stator and 250 positive fin angle spragless

10SHOTS wrote:

richter69 wrote:every combo is different, but it does sound a little tight...

either spray it more or have it loosened a tad.......... what brand and size converter?

its a 9.5 PTC with a 12 blade stator and 250 positive fin angle spragless

did they spec it to your combo? I wouldn't think they would put you in a 12 but they know what they are doing.

whatbumper wrote:

10SHOTS wrote:

richter69 wrote:every combo is different, but it does sound a little tight...

either spray it more or have it loosened a tad.......... what brand and size converter?

its a 9.5 PTC with a 12 blade stator and 250 positive fin angle spragless

did they spec it to your combo? I wouldn't think they would put you in a 12 but they know what they are doing.

Your Opinion what do you think ? 14 blade

remind me again what your combo is and car weight. et/mph range?

whatbumper wrote:remind me again what your combo is and car weight. et/mph range?

562 build
.A-460 block
TFS 325 CNC
TFS 4500 intake
1150 qf
4.300 stroke crank
6.8 H beam
4.560 bore
14.1 compessio
solid roller 280-292 112 lobe sep .786-785 lift
2-1/8 headers with 4 inch collector
transbrake 28x10.5 tire 4.10 gears
3250pds. 5.91 on motor 9.25 1/4 @146
5.33 @ 131 with a 1.24 60 foot ,shift @7100
275 plate shot

Your mph says your converter is too loose and your shift drop says it's too tight. It's just an inefficient converter.

Measure the line pressures in the trans and call PTC. I think they should spec you a new one and they will be able to use that info. Those numbers are very crucial to get it right with their designs. They most likely will take your converter in trade.

The transmissions input shaft and stator tube must be matched as well.


As far as adding more nitrous, I'm not sure if your cam will allow that. You can try though.

whatbumper wrote:Your mph says your converter is too loose and your shift drop says it's too tight. It's just an inefficient converter.

Measure the line pressures in the trans and call PTC. I think they should spec you a new one and they will be able to use that info. Those numbers are very crucial to get it right with their designs. They most likely will take your converter in trade.

The transmissions input shaft and stator tube must be matched as well.


As far as adding more nitrous, I'm not sure if your cam will allow that. You can try though.

problem is when i called ptc they said converter sounds like is working good, they even said add more spray to make it happy .

You could add more spray but I don't think your cam will like it. You can try though.

I would loosen it up a tad just like we talked about over the phone

larry552 wrote:I would loosen it up a tad just like we talked about over the phone

im going to try it one more time with more spray and get my tune up better on the kit. if i dont like it im goin to loosing it up

my brother has a 80 mustang about 200 pnds lighter than my car. c4 and a 445cid small block with a ptc 10inch toyota core 17 blade 150 fin angle 278-290 @.050 110 lobe sep 430 gear and runs right with my big block with a glide, he went 5.34 @142 300 shot on a fogger ,and his converter is not nearly as tight on motor as mine is, he bought a glide ,says he is goin to gap me with his small block. .

I think you would benefit from a 10". We just put a 19-3 in an x275 car that works well in a 582bbc.

10SHOTS wrote:my brother has a 80 mustang about 200 pnds lighter than my car. c4 and a 445cid small block with a ptc 10inch toyota core 17 blade 150 fin angle 278-290 @.050 110 lobe sep 430 gear and runs right with my big block with a glide, he went 5.34 @142 300 shot on a fogger ,and his converter is not nearly as tight on motor as mine is, he bought a glide ,says he is goin to gap me with his small block. .

he will pick up front half with a glide and will most likely need less gear to make it work even better.

whatbumper wrote:I think you would benefit from a 10". We just put a 19-3 in an x275 car that works well in a 582bbc.

whats that a 19 blade ? whats the 3 mean ?

10SHOTS wrote:

whatbumper wrote:I think you would benefit from a 10". We just put a 19-3 in an x275 car that works well in a 582bbc.

whats that a 19 blade ? whats the 3 mean ?

thats ptc's designation. yes 19 blade. surprised me when we got it but it works great. we've run anything from their 00 to 13-0 in our small block stuff but their technology has changed in the last few years so their setups are different now.

Once you put more spray on it or loosen it up your brother is going to have his hands full