Gen 3 FAQ and reference thread updates

MR2Board · 02-02-2007, 10:15 PM

Use this thread to submit updates for the Gen3 FAQ thread located at: Gen 3 FAQ and reference thread updates

nd4mr2spd · 09-13-2007, 02:05 AM

With the CT20B replacing the CT26 (which I understand is oil and also water cooled) - is the CT20B too?

HarrisRacing · 06-12-2008, 10:14 AM

I will be adding to this list here as I go through my gen 3 setup. I also have a few questions while I'm at it - Like is the clutch better in a gen3?

I think the exhaust manifold is slightly different as well - at least it looks a little bigger from the casting design...I will verify.

New exhaust heat shields - better design

totally different turbo oiling locations - much better especially if upgrading later.

Different heater and thermostat housings

There is a factory Exhaust gas temp thermocouple behind the cat. Note this is NOT an 02 sensor, but an actual 2 wire temp probe. I think this is why this fitting is in the Megan Racing downpipe - same one I use. I wondered what that was for!

Intake manifold looks like a lot better design...there is a larger plenum, and 4 large runners - b-bye TVIS.

Of course all oiling / cooling passages look a lot better. WAY bigger water feed to / from oil cooler. Nicer HFH as well - none of that is the same.

Check back for updates.

Thanks,
Patrick

Psycho · 06-12-2008, 06:52 PM

Quote:

Originally Posted by nd4mr2spd

With the CT20B replacing the CT26 (which I understand is oil and also water cooled) - is the CT20B too?

Yes, most turbo's that come on vehicles from factory are water cooled to combat the reliability issues of turbochargers.

Psycho · 06-12-2008, 07:02 PM

Quote:

Originally Posted by HarrisRacing

I think the exhaust manifold is slightly different as well - at least it looks a little bigger from the casting design...I will verify.

The exhaust manifold is much beefier than the gen 2, and is less prone to cracking with a larger turbo.

Quote:

Originally Posted by HarrisRacing

totally different turbo oiling locations - much better especially if upgrading later.

This also means turbo upgrades are engine specific. Upgrades like the Greddy kits won't fit with out a smaller oil feed adapter.

Quote:

Originally Posted by HarrisRacing

There is a factory Exhaust gas temp thermocouple behind the cat. Note this is NOT an 02 sensor, but an actual 2 wire temp probe. I think this is why this fitting is in the Megan Racing downpipe - same one I use. I wondered what that was for!

The exhaust temp sensor is unnecessary. So If an after market downpipe doesn't have a bung to put it in, you can simply disconnect the sensor and put a 2.2kom resistor in the harness.

PETC · 06-12-2008, 07:08 PM

I don't think the CT20B is water cooled...

PETC · 06-12-2008, 07:16 PM

Did some reading, guess I was wrong... Weird... I always thought they were just oil cooled, that's primarily why I bought my TT.

Psycho · 06-13-2008, 04:08 AM

What's even more weird is that the 20G (td06) I bought for my MR2 is only oil cooled, but the smaller 18G (td05) that bought for my WRX was both oil and water cooled. Why is it that the larger turbo doesn't get the extra cooling capabilities?

Ncturnal · 06-13-2008, 04:42 AM

This is a stickied FAQ thread. Please start new threads for these discussions.

HarrisRacing · 06-13-2008, 09:50 AM

Then how are we to add to the "Gen 3 differences" list then?

Yes the CT20b IS watercooled, just like the ct26. I looked at it last night on my gen3 motor.

Patrick

Sang · 06-13-2008, 09:56 AM

Quote:

Originally Posted by Psycho

What's even more weird is that the 20G (td06) I bought for my MR2 is only oil cooled, but the smaller 18G (td05) that bought for my WRX was both oil and water cooled. Why is it that the larger turbo doesn't get the extra cooling capabilities?

MHI makes lots of turbos. One of which being the td06...there are many variants, including both oil only and wet CHRA's.

02-02-2007, 10:15 PM	#1 (permalink)
MR2Board MR2.com Support Join Date: Feb 2005 Posts: 549 Thanks: 20 Thanked 59 Times in 35 Posts My Google Map iTrader Rating: (8/100% )	Gen 3 FAQ and reference thread updates Use this thread to submit updates for the Gen3 FAQ thread located at: Gen 3 FAQ and reference thread updates __________________ ATS Racing - Berk Technology - Chico Race Works - EMS Powered - Gi_Shu_Som Powdercoating - HorsePowerFreaks - KO Racing - Lithia Toyota - MR2Only Magazine - Sea2Sky Tuning - Side 2 Side Racing - The MR2 Store Please support our sites! Beams-Redtop.com - Carpron.com - MR2SC.com - MR2Trader.com - RMMOC.com - TurboMR2.com - V6MR2.com Put your location on the MR2 Google Map!

06-12-2008, 10:14 AM	#3 (permalink)
HarrisRacing Cage Fighter Join Date: Jun 2007 Location: Lafayette, La Posts: 162 Thanks: 11 Thanked 15 Times in 7 Posts My Google Map iTrader Rating: (0/0% )	More differences I will be adding to this list here as I go through my gen 3 setup. I also have a few questions while I'm at it - Like is the clutch better in a gen3? I think the exhaust manifold is slightly different as well - at least it looks a little bigger from the casting design...I will verify. New exhaust heat shields - better design totally different turbo oiling locations - much better especially if upgrading later. Different heater and thermostat housings There is a factory Exhaust gas temp thermocouple behind the cat. Note this is NOT an 02 sensor, but an actual 2 wire temp probe. I think this is why this fitting is in the Megan Racing downpipe - same one I use. I wondered what that was for! Intake manifold looks like a lot better design...there is a larger plenum, and 4 large runners - b-bye TVIS. Of course all oiling / cooling passages look a lot better. WAY bigger water feed to / from oil cooler. Nicer HFH as well - none of that is the same. Check back for updates. Thanks, Patrick

06-13-2008, 04:42 AM	#9 (permalink)
Ncturnal Google Ron Paul Join Date: Feb 2005 Location: Atlanta, GA Posts: 7,012 Thanks: 93 Thanked 126 Times in 106 Posts Blog Entries: 7 My Google Map iTrader Rating: (33/100% )	This is a stickied FAQ thread. Please start new threads for these discussions. __________________ Brian - My MR2Trader Ads - Click here for order or shipping status if you've bought something from me recently. Technical Questions - Please post them on the forums. Others who may have the same problem don't benefit from a PM exchange. If you wish to have my input I have no problem with a PM containing a link to a thread you have already posted.

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09-13-2007, 02:05 AM	#2 (permalink)
nd4mr2spd speed freak Join Date: Feb 2007 Location: Ogden, UT Posts: 27 Thanks: 2 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	With the CT20B replacing the CT26 (which I understand is oil and also water cooled) - is the CT20B too?

06-12-2008, 07:08 PM	#6 (permalink)
PETC √(176400) Join Date: Nov 2005 Location: Bellingham, WA Posts: 2,410 Thanks: 27 Thanked 52 Times in 45 Posts My Google Map iTrader Rating: (4/100% )	I don't think the CT20B is water cooled...

06-12-2008, 07:16 PM	#7 (permalink)
PETC √(176400) Join Date: Nov 2005 Location: Bellingham, WA Posts: 2,410 Thanks: 27 Thanked 52 Times in 45 Posts My Google Map iTrader Rating: (4/100% )	Did some reading, guess I was wrong... Weird... I always thought they were just oil cooled, that's primarily why I bought my TT.

06-13-2008, 04:08 AM	#8 (permalink)
Psycho MAY CAUSE CANCER Join Date: Mar 2008 Location: Hiding in your closet with an axe Posts: 71 Thanks: 5 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	What's even more weird is that the 20G (td06) I bought for my MR2 is only oil cooled, but the smaller 18G (td05) that bought for my WRX was both oil and water cooled. Why is it that the larger turbo doesn't get the extra cooling capabilities?

06-13-2008, 09:50 AM	#10 (permalink)
HarrisRacing Cage Fighter Join Date: Jun 2007 Location: Lafayette, La Posts: 162 Thanks: 11 Thanked 15 Times in 7 Posts My Google Map iTrader Rating: (0/0% )	Then how are we to add to the "Gen 3 differences" list then? Yes the CT20b IS watercooled, just like the ct26. I looked at it last night on my gen3 motor. Patrick