Mk3 supra turbo auto vs mk3 supra turbo manual stock boost pressure

[allfans26]

Hey guys,

I've looked around YouTube to find mk3 supras as stock as they can be on a manual and I've found a few. I've noticed that, in comparison to my stock auto mk3 supra, that the boost pressure for a manual has the ability to go up to 8 lbs of boost while my auto (when pushing the car very hard) goes up to around ~6-6.5 lbs of boost. I haven't done anything to the car besides some maintenance work to keep it fresh (like radiator and brake master is all). I was curious to ask why my boost pressure never reached the 8 lbs boost mark. I would love it if someone would elaborate on this. I couldn't find credible information by researching the information on Google.

Thanks,
Branden.

 

[rhs]

Assuming there's nothing wrong with your car, my thought is because the torque converter does not directly connect the engine and transmission, there's less load on the engine. For a manual, having the clutch create a mechanical connection would load the engine more than the viscous coupling of the torque converter.

 

[SideWinderGX]

That's normal, autos all things equal will see a bit less pressure than manuals.

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=TC&P=5

 

[allfans26]

That's normal, autos all things equal will see a bit less pressure than manuals.

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=TC&P=5

Oh, wow, I see! Do you think you can elaborate on why this is? I'm not trying to prove you wrong or anything, I'm curious to see why. Is there a way for me to get it to 8 psi or is that a bad thing? Does this have something to do with a waste gate opening early via factory or what? I like to ask questions. Haha