What is safe to push (PSI/Horse) on fresh head?

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What is safe to push (PSI/Horse) on fresh head?

Postby 1337computing » Tue Sep 10, 2013 2:31 pm

Head is rebuilt with chrome molly rings and cometic head gasket. A lot of other things were replaced when it was apart to and if not replaced was checked to make sure it was within spec. Pretty much saying it's is fresh and healthy. Right now everything is pretty much stock except for mods listed in signature. What is safe to push on stock turbo? I read that the ct26 can only handle to about 16lbs. At this point is it worth it or are you just pushing hot air and is it safe for the engine without head studs?

Mid winter I'm hoping to upgrade the turbo along with a fmic. Again is this safe for the engine without head studs? I'm not looking to go huge or push a rediculous amount but would like to get to the 250 - 300hp range. It's a fresh head and I really dont wanna pull back apart to put studs in.

Let me know what you guys think.
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1990 Celica All-Trac Turbo ST185

3" Berk DP, 3" Straight Piped, Magnecor Wires, EBC+
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Re: What is safe to push (PSI/Horse) on fresh head?

Postby quieter » Tue Sep 10, 2013 4:13 pm

if your going 15 psi+ you should change the head studs and get a metal headgasket (which you have), better be safe than sorry. you will get max 260 hp out of your ct26 with a fuel cut defender (ecu cuts fuel at 14.7), standalone ($$$), fmic like you mentionned (unless wta with good pump and heat exchanger), 3 inch exhaust and 3 inch downpipe. theres restriction because of the exhaust so if you got a stock one dont go over 12 psi. if you want to hit 300hp start shopping lol, if you want to stick with stock turbos ct20b is a nice upgrade, theres also the supra ct26 from a 7mgte ( not sure) or a ct27. dont go buy those cheap turbos from ebay. and of course if you get a standalone which are 1000-2000 for a plug and play one then your going to need a wideband unless it comes with it and you wont be needing a fuel cut defender and speed limit defender (if jdm swap) i might of forgot a couple of things
1990 toyota ST185 with st205 goodies (scrapped)
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Re: What is safe to push (PSI/Horse) on fresh head?

Postby built2run » Fri Oct 04, 2013 8:46 pm

On my st165 with an all stock engine/turbo I ran 15-16 psi daily for over a year and zero issues
"straight lines r 4 fast cars, turns r 4 fast drivers" Colin McRae.
ST165, black: parted and gone
ST165, white: rear ended by ass hat
ST165, white: sold to friend
ST185, black: current project, "The Kraken"
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Re: What is safe to push (PSI/Horse) on fresh head?

Postby jaydog82 » Tue Oct 08, 2013 4:11 am

Iv been running 14-15 for about a year as well and iv not had any boost related problems.
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Re: What is safe to push (PSI/Horse) on fresh head?

Postby built2run » Tue Oct 08, 2013 6:08 am

Jordan your pic!! Love it
"straight lines r 4 fast cars, turns r 4 fast drivers" Colin McRae.
ST165, black: parted and gone
ST165, white: rear ended by ass hat
ST165, white: sold to friend
ST185, black: current project, "The Kraken"
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Re: What is safe to push (PSI/Horse) on fresh head?

Postby 1337computing » Tue Oct 08, 2013 12:50 pm

Thanks for the info guys. Hopeing will update when everything is installed.
1990 Celica All-Trac Turbo ST185

3" Berk DP, 3" Straight Piped, Magnecor Wires, EBC+
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Re: What is safe to push (PSI/Horse) on fresh head?

Postby built2run » Tue Oct 08, 2013 6:39 pm

Keep us updated :)
"straight lines r 4 fast cars, turns r 4 fast drivers" Colin McRae.
ST165, black: parted and gone
ST165, white: rear ended by ass hat
ST165, white: sold to friend
ST185, black: current project, "The Kraken"
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