I dont know if there is room but id love to run a line from that passage to the outside of the tranny hooked to a needle valve and then dumping back in. Then line pressure adjustment would be super easy. Wouldnt be that hard to do I dont think.
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I dont know if there is room but id love to run a line from that passage to the outside of the tranny hooked to a needle valve and then dumping back in. Then line pressure adjustment would be super easy. Wouldnt be that hard to do I dont think.
Sounds good, but wouldn't the spring/regulator just try to overcome it?
Mike
Not sure what you mean, Mike. The bleed takes pressure away from what the stock valve/spring 'sees'. The mod is extremely similar in function to a manual boost controller in a wastegate line.
OK, I'm pretty sure I'm just not visualizing things correctly. If I'm not off track here, this mod "over-rides" the existing regulator (spring adjustment)?
I think I may need to go back over this thread to see where my mental train jumped the track!:o
Mike
doesn't completely override, just re-proportions it. Kinda like how the vacuum/boost line affects a fuel pressure regulator.
It doesnt defeat the stock spring/regulator valve, it just bleeds off some of the pressure that would be acting against the spring, so it ends up taking more pressure to move the regulator valve to the relief/bypass position, so line pressure goes up even with a completely stock spring and regulator valve.
Got it,thanks for the explanations!
Mike
Hello, Im thinking about drilling the bleed hole. I already have a rmvb (cheeta) in car now. Been in there for a few years. First thing I need to do is check line pressure to see where im at now. Can someone tell me the line pressure ammount again. And best way to check it ? Idle, 2nd gear. Power break motor in 2nd gear ? What numbers am i looking for ? Tranny was rebuilt when rmvb was put in. Tranny is working great. Just like the idea of having higher line pressure with lower reverse pressure. Did cheeta drill this hole already ? Thanks Ryan
I'll see if I can dig up the info, unless someone beats me to it.
As far as I remember, the cheetah RMVB was quite extensively reconfigured, so possible it doesn't have same valve cavity to drill hole in, or if it does it has unexpected effects.
ok, thanks. Ive never checked pressure. What should I be shooting for? 150psi in 2nd gear 2000rpm?? High 12sec acclaim
So how would this mod be on a stock trans?
My personal experience with the cheetah RMVB. Start by checking out page 10 on the link here...http://www.uscars.biz/uscars/extras-..._A415_A470.pdf
To check the line pressure on the cheetah RMVB you will need a 1/16th inch pipe thread adapter to a 200 psi gauge installed in the test port that it called "Kickdown apply" in the link I supplied. It will only have a reading in 2nd gear.
In 2nd gear, holding the brake on, you'll bring the revs up to about 1500 rpms and you should see about 120-125 psi. That's what my unmodified "no bleed" cheetah valve body reads when warm.
My personal findings are, above 150 psi, the apply pressure on the forward (rear) clutch is too great and it breaks the retaining ring out of the clutch pack and you don't go forward at all but reverse still works.
I've pushed it to 150 psi and it broke the clutch pack retaining ring as well as the clutch pack and seals on the input shaft. Stick to 120-130 psi warm maximum. I give my car 10 minutes of warm up time just to be sure the oil is warm enough to lower the line pressure to a point where nothing breaks but there's very firm, positive shifts.