Brake Boosting Problem

[TSiWarrior]

I can usually brake boost to about 17-20psi, but im only able to do this once in a great while. Most of the time i can only brake boost to about 7psi. Anyone know why I cant consistantly booost to the same level? I want to figure out how to get consistant 17psi launches.

 

[eclipsegs-t92]

i would suggest not doing this without proper cool down time first, put your car in neutral after brake boosting and let it rum for a couple of minutes to cycle and cool down the fluid to save your converter. i would think the reason for inaccurate boosting is because of a stock converter. if you want to build that kind of boost i would get a higher stall converter because your stock stall rpm might not be high enough to reach full boost capability.

 

[TSiWarrior]

I can reach high boost at certaint times. At the strip or not, It only seems to build boost occasionaly, and I would like to know why, sometimes it will do it when the tranny is cold, it can do it after hours of driving, I dont know what factors allow/keep it from building boost, If I could figure out how to get it to do it consistantly, I could run much better times. It seems fully capable of spooling my turbo, when it allows.

 

[eclipsegs-t92]

send your converter to ipt and put at least a 3500 stall on it

 

[92awdgsx]

It should stall at least 3200 stock. Restalled stock converter should stall about 4300. I can get it done for about $200.

 

[Eclipsei95cl]

It should stall at least 3200 stock. Restalled stock converter should stall about 4300. I can get it done for about $200.

I would say thats pretty high for stock but some cars are differnt. Most of the guys i know including myself can stall bewteen 2400-3000. A restalled converter doesnt=4300 stall. They can custom it to whatever you want.

As for why you can stall high and sometimes not im really unsure all i know is the more you brake boost the reliability of the converter goes down hill from there. If you wanted the strongest converter out there, look to IPTS billet converter.

 

[92awdgsx]

I would say thats pretty high for stock but some cars are differnt. Most of the guys i know including myself can stall bewteen 2400-3000. A restalled converter doesnt=4300 stall. They can custom it to whatever you want.

As for why you can stall high and sometimes not im really unsure all i know is the more you brake boost the reliability of the converter goes down hill from there. If you wanted the strongest converter out there, look to IPTS billet converter.

What you can stall your car to depends on the power of the motor and the holding power of the breaks. Why it would stall high sometimes and not others might be motor problems or something with the turbo. I have had that problem before. On a stock tranny, stock converter, stock brakes, 14b i can sometimes stall my car at 3700 rpms, but usually around 3500. Thats not good on the front clutches of the tranny though. Depending on what car you have the stall speeds should range from 2200- 3200 RPMs. 4300 is the max that you can restall a stock converter. I'm getting a converter custom made right now that is a 7" converter and should stall between 6000- 6500 RPMs. Its part mitsu and part toyota, and part GM. This is not for my car, but for another DSMer.

 

[Lee'sGSX]

What you can stall your car to depends on the power of the motor and the holding power of the breaks. Why it would stall high sometimes and not others might be motor problems or something with the turbo. I have had that problem before. On a stock tranny, stock converter, stock breaks, 14b i can sometimes stall my car at 3700 rpms, but usually around 3500. Thats not good on the front clutches of the tranny though. Depending on what car you have the stall speeds should range from 2200- 3200 RPMs. 4300 is the max that you can restall a stock converter. I'm getting a converter custom made right now that is a 7" converter and should stall between 6000- 6500 RPMs. Its part mitsu and part toyota, and part GM. This is not for my car, but for another DSMer.

Well?? Is this custom convertor done? I would like to know how it turned out.

 

[92awdgsx]

The converter is done, I just need to get the tranny finished and make a stronger flex plate.