Hey i was just curious on how much boost i can run on a stock ct-26 with a metal head gasket?? Im running 10psi now and was afraid to push it anymore than that,:evil2: especially since im getting ready to sell the car. The car also has a fuel cut defenser and from the looks of if the computer has been tuned..The car had a master power t-4 turbo on it when i purshased it but had a blown hg. can anyone help me???
How much boost will a ct-26 take??
- Thread starter j'smk3t
- Start date
In a stock form CT-26, anything above 13 psi is just jot air. Assuming that your 7M is running in tip top condition (heh), no more than 13 psi 
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Refer to: Search tool. This topic has been discussed more times than there are predicted answers. The fact is that toyota never released a compressor map. The ct26 boost potential isnt limited so much by a certain boost number. At some point you will just be blowing hot air and it would be pointless to not upgrade to get more. But, given proper cooling and careful tuning, you could squeeze a good bit outta the ct. Don't doubt the turbo just because its stock.
i ran 18 psi on my old stock turbo back when i had 550s and a lex w/o ill effects for about 6 months. after that it started to have a puff every now and then after letting off boost (oil past turbo seals). i shortly there after sold it to another board member and he had it on his car for about a year w/o issue.
that said id say anything over 15 or so psi is probibly pushing these turbos pretty hard. mine had 86k+ miles on it so that was probibly a contributing factor.
that said id say anything over 15 or so psi is probibly pushing these turbos pretty hard. mine had 86k+ miles on it so that was probibly a contributing factor.
ANOTHER controversial topic that really should have just been searched.
But since I'm in an arguing mood - There really is not an actual given NUMBER for how much boost a stock CT26 can handle. Yes, it's very true that after so much boost (typically after 15psi), it will just blow hot air, making it very ineffective...in other words, POINTLESS. But other than that, it's all about how good of shape the turbo is in. There are a few members known of that ran over 20psi on a stock CT either for "testing" reasons or simply trying to blow it to upgrade. Either way, it's just a matter of how good of shape it's in.
For all we know, a BRAND NEW CT26 from the dealership could handle 30psi...Doubtful, but I don't want anyone commenting on that unless you've done it (hearsay is very irritating).
Conclusion? As long as it's in somewhat healthy condition, upping your boost 2-3psi will definately make a difference in power output...and for the better. Anything too much more above that will just be waste of time and a turbo.
Jeff
But since I'm in an arguing mood - There really is not an actual given NUMBER for how much boost a stock CT26 can handle. Yes, it's very true that after so much boost (typically after 15psi), it will just blow hot air, making it very ineffective...in other words, POINTLESS. But other than that, it's all about how good of shape the turbo is in. There are a few members known of that ran over 20psi on a stock CT either for "testing" reasons or simply trying to blow it to upgrade. Either way, it's just a matter of how good of shape it's in.
For all we know, a BRAND NEW CT26 from the dealership could handle 30psi...Doubtful, but I don't want anyone commenting on that unless you've done it (hearsay is very irritating).
Conclusion? As long as it's in somewhat healthy condition, upping your boost 2-3psi will definately make a difference in power output...and for the better. Anything too much more above that will just be waste of time and a turbo.
Jeff
Ok.. So I have posted MANY times about this.. But it always seems to come up.
At the track one night; I was running 16 lbs on the CT-26 and ran continious 15.1's with a 2.1 60 ft. Now, I had dynoed the day before @ the same boost @ 279 HP, 337 TQ with less than 10:1 a/f ratios after 4100 RPM's.
So, I turned up the boost because I was sick of runnign such shitty times. Boost went to 19 lbs through all 4 gears and held hard; I ran a 14.1 with a 1.9 60 ft on street tires.
I then wished I could go and re-dyno the car; since I'm sure the higher boost made the a/f ratio's balanced out a little more and the car felt like it had pulled much harder.
Shortly after though, my turbo took a shit on me. I'm sure it's not too good for the turbo; but there has yet to be someone to prove the max efficiency limits of the CT-26 on a dyno w/ supporting mods.
At the track one night; I was running 16 lbs on the CT-26 and ran continious 15.1's with a 2.1 60 ft. Now, I had dynoed the day before @ the same boost @ 279 HP, 337 TQ with less than 10:1 a/f ratios after 4100 RPM's.
So, I turned up the boost because I was sick of runnign such shitty times. Boost went to 19 lbs through all 4 gears and held hard; I ran a 14.1 with a 1.9 60 ft on street tires.
I then wished I could go and re-dyno the car; since I'm sure the higher boost made the a/f ratio's balanced out a little more and the car felt like it had pulled much harder.
Shortly after though, my turbo took a shit on me. I'm sure it's not too good for the turbo; but there has yet to be someone to prove the max efficiency limits of the CT-26 on a dyno w/ supporting mods.
As stated above in the last few posts, it pretty much depends on how good of condition the turbo's in, plus the mods that are currently installed on the car. You could, theoretically saying, run 13 psi on a stock engine (not recomended) and be pretty damn close to reaching the efficiency of the turbo at that point in time. Now, if you had a 3+ inch exhaust, full hard pipes (hopefully running through the snorkel hole to squeeze some extra HP out) bigger, more efficient IC, and intake, you could probably up the boost a few psi's and still be operating in the turbos efficiency range AT THAT LEVEL OF MODIFICATION.... This though, is assuming the engine is running properly to handle the extra HP .
.starscream5000 said:As stated above in the last few posts, it pretty much depends on how good of condition the turbo's in, plus the mods that are currently installed on the car. You could, theoretically saying, run 13 psi on a stock engine (not recomended) and be pretty damn close to reaching the efficiency of the turbo at that point in time. Now, if you had a 3+ inch exhaust, full hard pipes (hopefully running through the snorkel hole to squeeze some extra HP out) bigger, more efficient IC, and intake, you could probably up the boost a few psi's and still be operating in the turbos efficiency range AT THAT LEVEL OF MODIFICATION.... This though, is assuming the engine is running properly to handle the extra HP
yeah, don't run over 9.5psi with stock exhaust, imo. It's workin' too hard.
with mods, I'm betting over 15 and you're spooling over 150,000 rpms and doing 10x the wear on it. I agree 13 has gotta be close, but not seeing the map, i don't know for sure. Personally i wouldn't go over 9.5 without safc and wideband tuning unless you drop 550's in it and a lex or maft. Even then, tuning is req'd for max hp, of course.
Thanks for all the info fellas.. And if anyone is interested the car will be up for sale tommorow..