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 Post subject: Re: what turbo?
PostPosted: Wed Nov 13, 2013 1:24 pm 
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WRC

Joined: Sun Oct 01, 2006 2:14 pm
Posts: 1098
Location: sunny sleaford- lincolnshire
Car Model: ST205
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


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 Post subject: Re: what turbo?
PostPosted: Thu Nov 14, 2013 3:56 pm 
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Joined: Sat Oct 19, 2013 9:28 pm
Posts: 18
Car Model: ST185 CS/RC
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


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 Post subject: Re: what turbo?
PostPosted: Thu Nov 14, 2013 6:04 pm 
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Group B
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Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3602
Location: Bournemouth
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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.

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 Post subject: Re: what turbo?
PostPosted: Thu Nov 14, 2013 8:45 pm 
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Club Staff
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Joined: Wed Jul 13, 2005 12:06 am
Posts: 4742
Location: Perth, Western Australia
Car Model: ST205
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!

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1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2012 Van Diemen JL12 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp


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 Post subject: Re: what turbo?
PostPosted: Thu Nov 14, 2013 9:27 pm 
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Junior WRC

Joined: Fri Mar 27, 2009 9:39 pm
Posts: 837
Car Model: None
the TT s148 is a great turbo at .9bar it makes 300bhp with plenty left for more if you want it :)

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 Post subject: Re: what turbo?
PostPosted: Thu Nov 14, 2013 10:38 pm 
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WRC
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Joined: Tue Dec 09, 2008 6:51 pm
Posts: 1396
Location: Austria
Car Model: None
Hi,

EFR and you are in heaven :lol:

greetz

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 Post subject: Re: what turbo?
PostPosted: Fri Nov 15, 2013 3:12 pm 
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Joined: Sat Oct 19, 2013 9:28 pm
Posts: 18
Car Model: ST185 CS/RC
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


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 Post subject: Re: what turbo?
PostPosted: Fri Nov 15, 2013 3:41 pm 
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WRC

Joined: Sun Oct 01, 2006 2:14 pm
Posts: 1098
Location: sunny sleaford- lincolnshire
Car Model: ST205
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 :)


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 Post subject: Re: what turbo?
PostPosted: Fri Nov 15, 2013 5:07 pm 
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Joined: Sat Oct 19, 2013 9:28 pm
Posts: 18
Car Model: ST185 CS/RC
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


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 Post subject: Re: what turbo?
PostPosted: Sat Nov 16, 2013 1:11 am 
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WRC

Joined: Sun Oct 01, 2006 2:14 pm
Posts: 1098
Location: sunny sleaford- lincolnshire
Car Model: ST205
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


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 Post subject: Re: what turbo?
PostPosted: Sat Nov 16, 2013 11:56 am 
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WRC
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Joined: Tue Dec 09, 2008 6:51 pm
Posts: 1396
Location: Austria
Car Model: None
Hi,

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

greetz

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 Post subject: Re: what turbo?
PostPosted: Tue Oct 17, 2017 11:01 am 
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Joined: Thu Mar 17, 2011 8:23 pm
Posts: 9
Location: Moscow, Russia,
Car Model: None
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.


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 Post subject: Re: what turbo?
PostPosted: Fri Oct 20, 2017 2:28 pm 
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WRC
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Joined: Tue Dec 09, 2008 6:51 pm
Posts: 1396
Location: Austria
Car Model: None
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

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 Post subject: Re: what turbo?
PostPosted: Mon Oct 23, 2017 4:35 pm 
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Joined: Thu Mar 17, 2011 8:23 pm
Posts: 9
Location: Moscow, Russia,
Car Model: None
Thanks for info, Sunny!


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 Post subject: Re: what turbo?
PostPosted: Mon Oct 23, 2017 5:53 pm 
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Junior WRC

Joined: Fri Mar 27, 2009 9:39 pm
Posts: 837
Car Model: None
this was my old s148 on the old engine
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