hey i was just woundering if it's true that there's a trick to adding extra pounds to the stock wastegate on the stock ct26 turbo.if so how do you?
EXTRA POUNDS ON THE CT26
- Thread starter jcr2fast4u
- Start date
You search....
Look for either "shimming the wastegate" or "manual boost controller" and you'll find your answer.
Look for either "shimming the wastegate" or "manual boost controller" and you'll find your answer.
manual boost controller and a HKS FCD run 15-18psi and 3" exhaust. Supposedly not good for the ct26 but she holds even when pushing hot air up in the 25-30psi range. I know it is all hot air at those boost levels but I wanted to see if the ct26 would take it. I saw 33psi on my boost gauge once. The stock setup loves 15-18psi.
My first MKIII I ran it at 28psi daily!!!! That is before I realized the problems with HOT AIR after 18psi. I am sure that if you have upgraded intercooler and piping you should be able to run up to 22psi daily and be efficient about it.
I've actually ran 15 psi then 18 psi on a dyno to see the performance change. I actually saw a decrease In horsepower from adding 3 psi. Current setup Intake, 3" turbo back exhaust, MBC, Bypassed AFM on dyno only. Autometer Boost Gauge. The biggest difference from stock is N/A cams. This may have been the main problem with the hp decrease but i'm not sure.
15PSI
18PSI
15PSI
18PSI
hmmm, deff intrested to see what 20psi on a stock turbo would do w/ a decent upgraded FMIC.
i know the max eff. for the stock TD04 of my srt is about 18psi and i run 22psi with exceptional gains, some even run up to 24psi.
ill be doing some testing once i get this thing running.
i know the max eff. for the stock TD04 of my srt is about 18psi and i run 22psi with exceptional gains, some even run up to 24psi.
ill be doing some testing once i get this thing running.
supraslo;913127 said:
IC & piping will have no effect with a CT26 above 16-18 psi...the incremental difference in CFM flow on this turbo above that (even 14 psi) will do little to increase HP. That is due to the volumetric capacity of the compressor housing itself. Higher psi does not equal higher HP...you need more flow, and that will require a new turbo
What he said.
The stock CT26 just SHOULD NOT be pushed past 14 PSI. It's simply not worth it. You won't get more FLOW, just more heat. If you do go ahead and cool that extra heat with a better IC, then you don't get more manifold pressure anyway, since it's simply not moving more air.
14 PSI is what I've gathered is the commonly accepted limit on the CT26, before it just doesn't do any more good.
Upgrade to a 57 or 60-1 trim compressor wheel, and that's a different story.
The stock CT26 just SHOULD NOT be pushed past 14 PSI. It's simply not worth it. You won't get more FLOW, just more heat. If you do go ahead and cool that extra heat with a better IC, then you don't get more manifold pressure anyway, since it's simply not moving more air.
14 PSI is what I've gathered is the commonly accepted limit on the CT26, before it just doesn't do any more good.
Upgrade to a 57 or 60-1 trim compressor wheel, and that's a different story.
Dan_Gyoba;913271 said:
True, but only to a point. The biggest benefit is boost (flow) will come on sooner, building the HP curve earlier in the power band. You will still hit the flow limit of the compressor housing in the 16-18 psi range.
supraslo;913086 said:
kotu100;913108 said:
supraslo;913127 said:
kotu100;913184 said:
this thread is funny, and interesting at the same time :biglaugh: --> :3d_frown:
For people that say after 14 psi, stock ct-26 is past its efficiency, can you provide any evidence of that theory. Nobody has stock compressor map, as Toyota never release it. What I know is people that crank higher boost in stock ct 26 still gain horsepower. I crank mine to 17.5 psi and I got 380 whp although mine is 62-1 ct26. I'll believe it when I see cranking stock ct26 to higher boost level do not gain any more power.
I didn't say you wouldn't gain some HP...I said the incremental increase over 14 psi (on a stock CT26) is small. I've seen it on dyno data pushing them from the 12-14 psi level to the 16-18 psi level. Especially when you consider the strain you're putting on the turbo.
Evidence? Gee, and I've never seen any blown turbos after guys have pushed them to that level...granted, they were the original turbo and had not been re-built. Even on the modified CT26 turbos, shafts have snapped at the higher boost levels due to the larger wheels used.
As stated earlier, a modified CT26 is a different case...you'll get some additional boost at the top, but even it is going to run out due to the housing.
Feel free to believe what you want
Evidence? Gee, and I've never seen any blown turbos after guys have pushed them to that level...granted, they were the original turbo and had not been re-built. Even on the modified CT26 turbos, shafts have snapped at the higher boost levels due to the larger wheels used.
As stated earlier, a modified CT26 is a different case...you'll get some additional boost at the top, but even it is going to run out due to the housing.
Feel free to believe what you want
Most of the reason why it blows hot air at that psi is because of the stock cast turbo elbow. Huge restriction with that turbo elbow blocking the wastegate gases. I'd like to see the efficency range of the stock CT26 turbo with the 3.0L engine.
Piggity;915086 said:
Especially since the turbo recirculates the exhaust gas...just adds heat and makes the EGR unnecessary.
Dude
You have NFI what you're talking about.