CT26 60-1 vs. SP61

[Fubar231]

Does anyone know how big of a difference the sound preformance 61 trim would compare to a CT26 60-1? I plan on running 15+lbs of boost, and i don't want the boost to fall off when it reachs full boost. Only thing is, if i got a SP turbo the tms turbo back dp wouldnt fit it anymore... What are you inputs? Just get a beefy CT-26 on the cheap, or go for the Sp61. Sp61's are a bit pricy, but i also heard that 60/60-1 trim ct26's arnt too durable. Also, if you suggest the CT-26 rebuild, how big of a difference is the 57trim to the 60-1 trims.

On the edit: How hard is it to install a turbo back exhaust? I dont really have any air tools, but my friends do. Is it a long project or just lift it up and slap it on. Also, i heard the BLITZ NUR exhaust is 2 inchs too long is one point and should be cut and welded to fit properly. Does anyone know about this or could you just bend the mounting wires a little to have it fit up?
Onto one last thing, can you put a external wastegate on a CT-26? Remove the internal one and run lines to an external?

[bgrieger]

SP61 is quite a bit larger. It is also quite a bit slower to spool. It is also a much more reliable arrangement than several have found in the 60 trim upgrade CT. I understood the SP was a bolt on housing...I guess not, but I've also never been inthe market so I never looked. I'm quite sure SP makes a downpipe for it if it requires something different too.

Never bother measuring things in boost pressures. They are what they are to make the power you want. It should be the horsepower number you care about.

57-60 trim. The difference is probably 20 HP at the peak, with quicker spool in the 57, and seemingly more reliability (that might also be because someone choosing a 57 is less often the type of person that pushes parts to the absolute limits...which a 60 trim is) but that all depends on tune, supporting mods, etc etc...

Exhaust, if there is no serious corrosion on anything, you can pretty much slap it in. If you have a downpipe and are putting the cat back on, you may as well get a high flow/metal substrate cat in there while you're at it. No sense choking it all with a stock cat. Will also make the install easier as there will be no chance of corroded parts not mating right if it is all new stainless.

No, you can't externally wastegate a CT. Technically you could, but then I'd have to call you an idiot for wasting all that money.

[Fubar231]

Ill probably just end up getting the ct-26 57 trim for 625 from driftmotion. The SP is a bolt on turbo btw. Im also using a TMS Turbo back DP and a TMS testpipe. Im also not really aiming for a horsepower level. Im just following a upgrade path on one of the supraforums. Exhaust, Downpipe , catback, intake, injectors, afm, and a new turbo and thats all i plan on really doing to the engine. Supporting mods of course like new fuel system and such, but im not aiming for a power level, im just doing this and what i end up at, is what i end up at. So you think a 57 trim ct-26 would be good from 15-20lbs of boost or somewhere in there? Im going to run 12 when i get the car back from this MHG job, yes today is 3 weeks, and of course im going to run it easy for a while. I just want to run around 16lbs of boost, dont know why. Just a fan of boost'ed cars personally.

EDIT: Does anyone know if the TMS Testpipe will bolt up to the BLITZ NUR SPEC exhaust without and modification?
What do you guys think about the DDP? (Divorced down pipes) I heard they help the turbo and wastegate with somethin. I think i was lookin at a BIC DDP?

[Jeeves]

The concept of runing ## PSI is totally wrong. You're running ### PSI at ### CFM. PSI is RESISTANCE to flow, while CFM is the actualy volume of airflow. CFM is the truly important number, but is much harder to measure. This is why compressor maps are so important.

[Fubar231]

Anyone got any input on the ct57 holding boost compared to an SP1 or would i have to be running an insane amount? Also, what about DDPs compared to DPs? Thanks alot everyone.

[Jeeves]

I've heard good things about DDP's but it seems to me as long as you've got proper exhaust sizing that shouldn't be an issue.

[Fubar231]

Hmm, nice. Alrighty well i got all the info i really needed on this thread, thanks alot guys.

[bgrieger]

DDP's are actually proven to provide a little better spool and a little freer flow at the peak. I wouldn't run an open DDP though. There are several that reintegrate the wastegate stream down and away from the exducer and get the same results, without the sound and cat bypass. Emissions and police are a bear we have to deal with here are primarily my reasons, but having driven a downpipe only car once the noise drove me nuts too.

That said, I'm with Jeeves. The gains are real, but if you already have a proper sized system, I wouldn't go and purchase one. If I was purchasing a system for the first time I would look at one.

[Fubar231]

Well i mostly got the stock exhaust, exhaust a aftermarket muffler. I was going to do TMS DP-TP, and Blitz Nur Catback. Does that sound good? Or should i look into DDP's? I hanv't read too much about them, but they sound a little more complicated.