Best Converter

[Dusty Bradford]

Dave's Neil Chance unit had around 14% slip and his et's were in the 8.7 range at 157-160. Given he had some issues but the converter was not coupling in high gear even with the car down on power. The first PTC showed 4% but was a little tight down low, the car was still down on power but slipped 10% less. I sent him another and the car went 8.34 at 167 with 7% slip with the motor issues fixed. We used the TCI calculator on both for comparison reasons.

The other car has the motor out so no data from it.

 

[bragggf]

NOS setup for quick spool-up

Make it tight and use nos. No worries.

Don:

Can you provide more details about the NOS setup you use to improve turbo spool-up as opposed to a higher stall converter?

This application is a THM400, trans brake stock long-block car that is currently running an MPH limited 11.5@114 et, 1.51-1.55 60fts. Front mount, PTE-52, etc..

This car is street driven so performance from a 30mph roll is just as important as the track. Currently we have a 3400 10" converter and while the car is quick it slips in the 20-25% range.

Looking for either a very safe NOS setup that can be used to spool the turbo and use a tighter unit or a converter that will help us get back some of the MPHI.

Appreciate any suggestions. Thanks!

 

[Alky V6]

I feel I would be hijacking another's thread if we started writing about the perfect marriage of nitrous injection and turbocharging. How about if I start up a thread on the subject. I think I've already discussed the subject 'til I was blue in the face before though.

Ask Otto what he thinks of nitrous injection.

 

[baknblk]

Donnie Wang,

What percent of slip are measuring with your chance converter and what tool are you using to measure it ?

 

[Alky V6]

Donnie Wang,

What percent of slip are measuring with your chance converter and what tool are you using to measure it ?

I'm using Performance Trends' Drag Racing Pro v2.0 Analyzer. With the data I have up to this point I'm seeing 10% slip at the 660 ft. mark and estimate I'll see 7% slip at the 1320 ft. mark. I haven't had this setup on a quarter mile track yet. One more week.

 

[bison]

Don:

Can you provide more details about the NOS setup you use to improve turbo spool-up as opposed to a higher stall converter?

This application is a THM400, trans brake stock long-block car that is currently running an MPH limited 11.5@114 et, 1.51-1.55 60fts. Front mount, PTE-52, etc..

This car is street driven so performance from a 30mph roll is just as important as the track. Currently we have a 3400 10" converter and while the car is quick it slips in the 20-25% range.

Looking for either a very safe NOS setup that can be used to spool the turbo and use a tighter unit or a converter that will help us get back some of the MPHI.

Appreciate any suggestions. Thanks!

My suggestion is that you get a new converter. That ones not even close.

 

[baknblk]

I'm using Performance Trends' Drag Racing Pro v2.0 Analyzer. With the data I have up to this point I'm seeing 10% slip at the 660 ft. mark and estimate I'll see 7% slip at the 1320 ft. mark. I haven't had this setup on a quarter mile track yet. One more week.

Great I can not wait to hear . I was very surprised to hear some of these guys running a 150+ mph with out a tool to determine drive shaft rpm and wheel speed. One would think you would want to know if you are spinning the tires at these type of speeds. Not a slam just very surprised with how reasonably priced some of these tools are.

 

[baknblk]

I have tried a switch pitch setup and it works ok but it gives up efficiency over a fixed pitch converter, at wot. It will drive like a stocker on the street and work well with the gv for crusing over a fixed converter, but it will have some durability issues with the transbrake and you may expect to see high slippage numbers over ~20% at the top.

You have to becareful with converter selection as the GV will cause the converter to slip more when cruising, however if you make it too tight the turbo won't spool. You have to decide on what compromises you have to live with.

Norbs,
What kind of slippage are you seeing with your PTC and what are you using to determine slippage ? What percentage should be contributed to the GV ? I really appreciate everyone's input ! Thanks Joe for starting this thread . I just wish I would have known how important the selection of a converter is the first time as this has been a very costly decision on my part. It seems like every time I do not research everything to death no matter how small of a change it bites me in the ass.

 

[baknblk]

You know your next Bill Anderson.

 

[BEATAV8]

subscribing... future Dusty spec PTC owner here. Currently suffering huge slippage numbers with a Vigilante right now.

 

[baknblk]

subscribing... future Dusty spec PTC owner here. Currently suffering huge slippage numbers with a Vigilante right now.

I called Vigilante last week and the guy on the phone told me their converters are under 10 % slippage and will be right the first time for around 650.00.

 

[BEATAV8]

I called Vigilante last week and the guy on the phone told me their converters are under 10 % slippage and will be right the first time for around 650.00.

Try more like 20% through the traps on a 600HP car. It's going into the wife's 400HP car where maybe it will do a little better. It is a great driving converter on the street but I'm just blowing through it really hard.

 

[baknblk]

subscribing... future Dusty spec PTC owner here. Currently suffering huge slippage numbers with a Vigilante right now.

Try more like 20% through the traps on a 600HP car. It's going into the wife's 400HP car where maybe it will do a little better. It is a great driving converter on the street but I'm just blowing through it really hard.

The website states a 24 month warranty free from defects in material and workmanship. Would that not be a workmanship problem ? This is my biggest fear that it is not right the first time. I have a converter already like that not right the first or second time, and they want me to pay for the adjustments. Imagine spending up to 2k on one and it not be right, I would have an outer body experience over that. Hurry up and get that converter and test it will you !:biggrin:

 

[norbs]

I am just putting the car back together so i don;t have any data on the new ptc unit. There should be no slippage in the GV unit if its working properly im told. The motor was out of balance 200 grams, since crankshaft specialists balanced it wrong. But i had a precision lock up before and the 20% figures are accurate in the real world, and i am using the TCI calculator.

 

[johnplogii]

Art carr

I run the old 16930 art carr n/l "n" stall & the tci calculator shows 14.3% slip. I used to run a vigilante & it was like 24-25% slip. The art carr picked up 2 tenths & 3 mph in the 1/8th mile over the vig. Would I likely see a gain with a more efficient convertor? Or would I just see less rpm through the traps?

 

[bragggf]

I feel I would be hijacking another's thread if we started writing about the perfect marriage of nitrous injection and turbocharging. How about if I start up a thread on the subject. I think I've already discussed the subject 'til I was blue in the face before though.

Ask Otto what he thinks of nitrous injection.

thanks Don - I'll do a query on your previous posts on this subject.

 

[1CleanT]

I think I am going to run a Bradco convertor.... heard some good things about them

 

[bison]

The website states a 24 month warranty free from defects in material and workmanship. Would that not be a workmanship problem ? This is my biggest fear that it is not right the first time. I have a converter already like that not right the first or second time, and they want me to pay for the adjustments. Imagine spending up to 2k on one and it not be right, I would have an outer body experience over that. Hurry up and get that converter and test it will you !:biggrin:

Thats why you should go with a PTC. These things are proven in high hp Turbo regals. They work down low and up top. No BS and they are damn close on the first shot.

 

[bison]

I run the old 16930 art carr n/l "n" stall & the tci calculator shows 14.3% slip. I used to run a vigilante & it was like 24-25% slip. The art carr picked up 2 tenths & 3 mph in the 1/8th mile over the vig. Would I likely see a gain with a more efficient convertor? Or would I just see less rpm through the traps?

You have a lot to be gained with a converter swap. Id guess at least another 3 mph up top and maybe more.

 

[odell4o8]

convertors

Dusty, people switching from chance convertors to ptc are they selling their chance convertor? if so whats a chance bolt together in good cond, worth? just wondering.