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what turbo?
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Author:  dale [ Wed Nov 13, 2013 1:24 pm ]
Post subject:  Re: what turbo?

At that rpm it won't make anything as above.

To see how they die pretty much every dyno chart from stock turbo to garretts don't do well past 6000-6600

Author:  robergt4 [ Thu Nov 14, 2013 3:56 pm ]
Post subject:  Re: what turbo?

TrackToyFour wrote:
The stock cams and turbo would be outside their efficiency range at that rpm. If you let us know what your goals are for the car we can advise. Engine mods, horsepower and torque, road and/or track use etc. etc.

My st185 cs:
Gen2 3SGTE stock, cometic gasket C4315-040 (1.4-1.6 MM) crankshaft and connecting rod caps new oem, stock CT26, donwpipe 2.5 "koracing, except final stretch oem exhaust, k & n panel filter, 0.7 mm gap BKR7E , Magnecor cables8mm, walbro255, sard fpr, engine radiator 56mm ASI, ST205 watercooler,MBC.
BHP on dyno 240hp @ 5900rpm (0.85 bar) 360nm @ 3900rpm (1.1 bar).
212bhp @ 7000rpm.

Looking 280hp @ 6000rpm, is it possible with CT20 get to 1.1 bar at 6000rpm?
With wastegate OEM preloaded up to 1bar or with forge or kinugawa wastegate+MBC.


Road vehicle use, mountain sports use and some relaxed trip

Author:  Nibbles [ Thu Nov 14, 2013 6:04 pm ]
Post subject:  Re: what turbo?

The standard st205 turbo (often known as ct20b) is a worthwhile upgrade on a 185. It is almost a straight swap - apart from the mounting hole underneath and for the heatshield being about 10mm to one side. Easily dealt with by slotting the turbo bracket and drilling a new hole in the heatshield. This turbo will maintain boost better at higher RPM than the 185 turbo, with very little loss of bottom end efficiency.
IMO it is probably the best option for a car used mainly for road. Many aftermarket turbos require a lot of gearchanging on hills as the increase in power is at the expense of low end torque.

Author:  TrackToyFour [ Thu Nov 14, 2013 8:45 pm ]
Post subject:  Re: what turbo?

Nibbles wrote:
Many aftermarket turbos require a lot of gearchanging on hills as the increase in power is at the expense of low end torque.
Wise words!

Author:  mixer72 [ Thu Nov 14, 2013 9:27 pm ]
Post subject:  Re: what turbo?

the TT s148 is a great turbo at .9bar it makes 300bhp with plenty left for more if you want it :)

Author:  Sunny [ Thu Nov 14, 2013 10:38 pm ]
Post subject:  Re: what turbo?

Hi,

EFR and you are in heaven :lol:

greetz

Author:  robergt4 [ Fri Nov 15, 2013 3:12 pm ]
Post subject:  Re: what turbo?

mixer72 wrote:
the TT s148 is a great turbo at .9bar it makes 300bhp with plenty left for more if you want it :)
get 300bhp is possible in my st185cs with stock ecu with tt s148?
With adjustable fpr for ideal afr.

which is the limit of the stock pistons? 320bhp?

greetings

Author:  dale [ Fri Nov 15, 2013 3:41 pm ]
Post subject:  Re: what turbo?

robergt4 wrote:

Looking 280hp @ 6000rpm, is it possible with CT20 get to 1.1 bar at 6000rpm?
With wastegate OEM preloaded up to 1bar or with forge or kinugawa wastegate+MBC.


Road vehicle use, mountain sports use and some relaxed trip



That is easy on a 205 turbo yes :)

Author:  robergt4 [ Fri Nov 15, 2013 5:07 pm ]
Post subject:  Re: what turbo?

dale wrote:
robergt4 wrote:

Looking 280hp @ 6000rpm, is it possible with CT20 get to 1.1 bar at 6000rpm?
With wastegate OEM preloaded up to 1bar or with forge or kinugawa wastegate+MBC.


Road vehicle use, mountain sports use and some relaxed trip



That is easy on a 205 turbo yes :)

Is the temperature of admission correct up to 1.2 bar in the CT20?
On st205 watercooler
Greetings

Author:  dale [ Sat Nov 16, 2013 1:11 am ]
Post subject:  Re: what turbo?

I wouldn't run any turbo for prolonged 1.2 bar on the charge cooler as generally after sustained use the cc just doesn't cut the mustard.

But my ct20 has covered 141,000 miles and the last 80,000 have been between 0.6 and 1.2 bar and many many miles have been track and nurburgring miles and she still running well. :)

But I oil change every 3k miles top

Author:  Sunny [ Sat Nov 16, 2013 11:56 am ]
Post subject:  Re: what turbo?

Hi,

:arrow: correction, not with a pressure regulator but with a ECU you get the correct AFR :idea:

greetz

Author:  Anton13 [ Tue Oct 17, 2017 11:01 am ]
Post subject:  Re: what turbo?

Bump =)

Any updates after 5 years?
Stock unit is tired, looking for replacement.
Anyone can post info about s148 and BW 6758 spool times?

I have st205, used only for time attack, winter sprint, etc. Specs: 3inch exhaust, AEM320 fuel pump, SCG-1 boost controller.
I want to have responsive engine, about 350-400hp. Thinking about new injectors, turbo and standalone ECU.

Would appreciate any opinions about possible ct20b alternatives.

Author:  Sunny [ Fri Oct 20, 2017 2:28 pm ]
Post subject:  Re: what turbo?

Hi Anton,

i am using a 6758, i have no spool time for you but a dyno sheet

Image

note that this was after the first mapping, just to drive the engine in
curently i drive max boost und up to 8250rpm, unfortunetly i aint have a dyno sheet
however, you cant can 100% compare my engine to another as it is pretty specific built

for 350-400HP i aint would use the 6758 as it is good for ~500HP, you better went with 6258 twin entry which is rated
to 450HP and perfect for your goals

greetz

Author:  Anton13 [ Mon Oct 23, 2017 4:35 pm ]
Post subject:  Re: what turbo?

Thanks for info, Sunny!

Author:  mixer72 [ Mon Oct 23, 2017 5:53 pm ]
Post subject:  Re: what turbo?

this was my old s148 on the old engine
Image
Image

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