how much boost is to much

sassan · 03-22-2011, 01:52 PM

i have a 87 turbo supra and im about to buy an intercooler kit and a boost controller. my ?s are at wat point does the stock turbo max out? how much boost can i run on my stock engine without hurting my it? and at wat point do i need or will i need a bov?

cre · 03-22-2011, 10:49 PM

How much boost the engine will take is more an issue of fuel supply. The engine itself should take as much as the CT-26 is capable of while still in it's range of efficiency. Running lean, a bad head gasket, high engine temps and carbon buildup are the largest concerns when just pushing the CT-26.

The CT-26 is efficient up to between 12 and 14psi, after that the air it's pushing out is hot to the point that you're more likely to lose power due to the ECU pulling ignition advance.

The OEM bypass valve will handle 14 or so psi but naturally that depends on what shape it is currently in. If it needs replaced I would go with a Bosch, they're inexpensive and plumb right in. I do not recommend going with an atmosphere vented BOV if you don't have the ability to tune for it (which you don't).

03-22-2011, 01:52 PM	#1
sassan Intake Join Date: May 2010 Location: rialto Posts: 48	how much boost is to much i have a 87 turbo supra and im about to buy an intercooler kit and a boost controller. my ?s are at wat point does the stock turbo max out? how much boost can i run on my stock engine without hurting my it? and at wat point do i need or will i need a bov?

03-22-2011, 10:49 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	How much boost the engine will take is more an issue of fuel supply. The engine itself should take as much as the CT-26 is capable of while still in it's range of efficiency. Running lean, a bad head gasket, high engine temps and carbon buildup are the largest concerns when just pushing the CT-26. The CT-26 is efficient up to between 12 and 14psi, after that the air it's pushing out is hot to the point that you're more likely to lose power due to the ECU pulling ignition advance. The OEM bypass valve will handle 14 or so psi but naturally that depends on what shape it is currently in. If it needs replaced I would go with a Bosch, they're inexpensive and plumb right in. I do not recommend going with an atmosphere vented BOV if you don't have the ability to tune for it (which you don't). __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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