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

allfans26

New Member
Sep 11, 2015
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0
1
Lawrenceville, Georgia
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

New Member
Sep 21, 2014
147
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Dallas
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.
 

allfans26

New Member
Sep 11, 2015
26
0
1
Lawrenceville, Georgia
SideWinderGX;2063040 said:
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