 |
 |
 |
|
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
|
Go | New | Find | Notify | Tools | Reply | |
| PG Dump Valve? | Login/Join |
DRR S/Pro |
Has anyone used a converter dump valve with a PG and a NA engine for bracket racing? If so, was it consistent? 272" Spitzer 540 Chevy The Blower Shop XR1 FTI XPM Series Converter FTI Level 6 Powerglide 3.69@199 .916 60' 2017 Bradenton Heads Up Madness Open Outlaw Champ 2018 PDRA T/D #5 2019 PDRA T/D #2 2020 Retired From T/D Competition.... 2020 Bradenton NMCA Hemi Shootout Winner 2021 getting back into bracket racing with a Gen3 Hemi powered 87 Cutlass. | ||
|
DRR Pro |
I don't see why it would not be consistent there is a lot of TS cars using them and stacking numbers | |||
|
| DRR Sportsman |
What’s the purpose of a dump valve?? | |||
|
DRR Sportsman |
Just watch how long you keep it on. The thing to remember is that typically a lower hp level power glide is going to have about 200 psi max of line pressure, so dumping that might get you in trouble with the band if you leave it dumped to long. Jeremiah Hall | |||
|
| DRR S/Pro |
im not a na setup but ive been usoing one for along time with zero issues, seems to be consistent... J.R. Baxter ""Fathom the hypocrisy of a Government that requires every citizen to prove they are insured ..but not everyone must prove they are a citizen." 2024 Miller Rolla Competition Engines ProCharger Hoosier Tires Abruzzi | |||
|
DRR S/Pro |
All depends if it is a internal converter line pressure dump or a external cooler line dump valve. | |||
|
| DRR Top Comp |
As consistent as a shift because that's what it is essentially, another gear (converter line pressure dump). If I did it, I'd have a roller thrust on the crankshaft. And a metal can bellhousing. | |||
|
DRR Trophy |
External cooler line dump valve was pretty much worthless for me as far as changing converter stall. | |||
|
| DRR Top Comp |
You need a Hughes, heads up racers around here are getting them and pretending they went 3 sp transmission through FB video's. The fast grudge racers with no weight limits pioneered-perfected it mostly. You need a roller thrust on the engine to do it right. With a roller thrust on the engine/crank, you're not as limited on what you can do with converter pressure. Metal can bellhousing for safety in experimentation. | |||
|
DRR Sportsman |
What are you trying to do? I always wanted to try a dump for n/a vs. nos situations. | |||
|
| DRR Trophy |
Not a lot of accurate info in this thread... | |||
|
| DRR S/Pro |
Raise the converter stall/flash at the launch. 272" Spitzer 540 Chevy The Blower Shop XR1 FTI XPM Series Converter FTI Level 6 Powerglide 3.69@199 .916 60' 2017 Bradenton Heads Up Madness Open Outlaw Champ 2018 PDRA T/D #5 2019 PDRA T/D #2 2020 Retired From T/D Competition.... 2020 Bradenton NMCA Hemi Shootout Winner 2021 getting back into bracket racing with a Gen3 Hemi powered 87 Cutlass. | |||
|
| DRR Sportsman |
not to be a smart azz but why not just get the right stall converter for your application? seems much easier to me. ep | |||
|
| DRR Pro |
EP it gives you the ability to raise or lower the flash to meet different track and weather conditions more so than just a plain converter and can be used to prevent converter ballooning while managing wheel speed. It helps to have a lot of HP too lol.... | |||
|
DRR S/Pro |
So why not correct what is wrong so everyone has the right info? ____________________________ 2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion 2018 Div4 Goodguys Hammer award winner | |||
|
| DRR Trophy |
I tried an external cooler line dump valve for this reason and it was not effective. I wanted to run a tighter converter for NOS and use the dump valve to loosen it for NA. I was monitoring the pressure on the cooler circuit through my Racepak and could verify a change in pressure, but little to no change in converter stall. | |||
|
| DRR Trophy |
Because it usually ends predictably on this website... Due to the design of the line pressure regulator the converter charge circuit is the last to receive fluid. Only once the line pressure regulator is cracked from reaching desired pressure does the converter charge circuit recieve fluid. That is to say you will cavitate the converter before line pressure is affected and band/clutch pressure is affected. A dump valve reduces converter charge pressure, so unless your totally out in left field making spool changes you do not need roller thrust. For that matter a steel bellhousing is just massive overkill, especially for typical bracket/top rides. Internal dump is drastically more affective than an external. The Hughes setup is easy enough, if not overpriced, you can duplicate it for half the cost. Id recommend adding a hydraulic flow control valve vs a changeable orifice. Stall RPM is one area to manipulate, the area right at shift and post-shift can help with RPM recovery. | |||
|
| DRR Top Comp |
There's a small window of opportunity because you want a maximum of around 125-135psi converter pressure, and a minimum of around 35 psi, if you run a conventional thrust on the crank. You can make the window of opportunity larger for adjusting stall via pressure, using a roller thrust and more converter pressure. 35psi to 250psi plus as example.This message has been edited. Last edited by: Mike Rietow, | |||
|
| DRR S/Pro |
I understand. Thanks for the explanation. ____________________________ 2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion 2018 Div4 Goodguys Hammer award winner | |||
|
| DRR Trophy |
Although this is fundamentally right, there will be a larger window of available pressure range, the problem is once you have reached the point of preventing cavitation there is little to be gained. Most of the vehicles on this forum will not be cavitating with normal converter charge pressure, thus rendering the idea of a bigger tuning window irrelevant in your example. This is highlighted by the fact that formulas for calculating stall/slip/torque do not even factor in fluid pressure, instead it merely relies on fluid density. If you have a converter equipped ProMod, yes this maybe of some benefit but most people will never benefit from that type of thinking. | |||
|
| Powered by Social Strata | Page 1 2 |
 | Please Wait. Your request is being processed... |
|
 |
 |
 |
 |
