[Mk2] [Turbo] Rev3 - CT20b v CT26 hybrid v CT20b hybrid

[rev3gtturbo]

As some us might only replace a turbo once, any new turbo will feel loads better that an old tired one, so I don't know how easy it is to answer this question (without a dyno).

What is the best bolt on turbo for a rev3 to give it a bit more power over stock for reliable daily driver road use, upto 300 bhp?
(Car is stock apart from an HKS induction kit, Blitz bov and an MBC).

I think the choice is between stock CT20b, or a hybrid CT26 or a hybrid CT20b?

Any recommended suppliers? (PM me if there are any to avoid).

Any experience of how many miles they last?
(I know of 2 rev3's that did over 120,000 miles on the original turbo without them failing, but it is looking like my current rev3 car has seen off 2 CT20b's in around 110,000 miles).

At the moment it is looking likely I need to buy something next week.

cheers

[sky-net]

i've been reading about the ATS CT21 this afternoon. It seems to be a pretty decent upgrade over stock CT20b as a direct bolt on

[craig]

A strengthened CT20b is a great road turbo. Toyota got it pretty spot on with it.

Just needs a steel shaft to replace the ceramic item, and 360 degree thrust washer as opposed the factory 270 degree item.

Boost increase and a stand alone ecu, you'll see over 300bhp, and a fast spooling powerful road car.

[Nic]

If I needed to replace my CT20b turbo I would replace it with a Garrett GT28RS, a more modern, double ball bearing turbo which would give similar power but be far far more responsive. It would require an adapter for the stock exhaust manifold, water and oil lines and the downpipe modifying but could be run with the stock fueling and ECU at moderate boost levels.

[markstevieandmads]

I've read somewhere that ct20b spool is slower than a ct26 but people upgrade as a ct20b holds the boost to the red line where the ct26 dies off at the topend?

[MR2 Rich]

I would definitely look at the GT28, I know there is a few versions so would need to read up on them.

[C35Rob]

Personally I don't see the point in a GT28rs, you need a manifold adaptor, new downpipe, oil and water lines etc.. And to get the best out of it you'll need a mappable ECU too.. For the costs involved you may as well go for a gt30, t34, td06 or a holset HX30

A hybrid ct20 would be a great street turbo for standard management and internals though - although ATS don't include any real details of the upgrades, I'd be wary of buying something without knowing really what it is.

Just my 2p

[Odin_S]

I would say you were limited to 1.2bar so what's the point without going the whole way? I.e. forged engine

I still think CT20b is enough, those hybrids require running more boost to get there claimed numbers. Once you want to run more than 1.2bar, you start getting into limits for components eg fueling

All imo of course

[Race Idiot]

I"d give owens development a call regarding your turbo. They did a fantastic rebuild on my TD05. Hell, owens even offered to convert my turbo into a ballbearing type instead of a journal bearing type.

They were also able to tell me exactly why the turbo failed, couldnt recomend them enough.

Maybe they might be able to even fit a billet compressor to one, i'm pretty sure thats what ATS have done with their CT21.

[rev3gtturbo]

Thanks for the replies so far. I have spent loads of time this weekend going over the options.

For those that mentioned the Garrett GT28, why not the newer GTX28 ?

[bobhatton]

Thanks for the replies so far. I have spent loads of time this weekend going over the options.

For those that mentioned the Garrett GT28, why not the newer GTX28 ?

Yes the GTX28, but the right one

[rev3gtturbo]

Thanks for the replies so far. I have spent loads of time this weekend going over the options.

For those that mentioned the Garrett GT28, why not the newer GTX28 ?

Yes the GTX28, but the right one

What would be the right one?

[Al-sw20]

Best stock fuel system turbo is still the ct20b. They are cheap, plentiful and provide proven performance time and time again.

GT28 is a total waste of time and money. Two of my friends with MR2's have these turbos.

One runs a gen3 3sgte that has a forged bottom end and 1mm oversized valves. Run by an old Link Plu ecu! Stock ct20b @ 1 bar on 95 RON fuel, intake, downpipe, exhaust, greddy copy intercooler. Puts down 291hp @ wheels.

The other has a stock gen3 engine, Power FC, intake, downpipe, exhaust, Greddy sidemount intercooler, GT28RS (0.63 A/R) @ 1.1 bar boost on 98 RON fuel. 292hp @ wheels.

[bobhatton]

Thanks for the replies so far. I have spent loads of time this weekend going over the options.

For those that mentioned the Garrett GT28, why not the newer GTX28 ?

Yes the GTX28, but the right one

What would be the right one?

http://www.turbobygarrett.com/turbobyga ... r#GTX2860R

[jimGTS]

One runs a gen3 3sgte that has a forged bottom end and 1mm oversized valves. Run by an old Link Plu ecu! Stock ct20b @ 1 bar on 95 RON fuel, intake, downpipe, exhaust, greddy copy intercooler. Puts down 291hp @ wheels.

im assuming this is some sort of world record at 1bar of boost and that grade of fuel?
that is certainly not the norm for 1bar.

[Nic]

For those that mentioned the Garrett GT28, why not the newer GTX28 ?

As a simple replacement for the stock turbo, the GT28RS would be my personal choice, I've used Garrett GT**R turbos in other cars and know just how good - and reliable - they are. If I was looking for more power and also upgrading the fueling and ECU then yes the GTX would be a better choice, they do however cost a lot more.

[DottySkee]

One runs a gen3 3sgte that has a forged bottom end and 1mm oversized valves. Run by an old Link Plu ecu! Stock ct20b @ 1 bar on 95 RON fuel, intake, downpipe, exhaust, greddy copy intercooler. Puts down 291hp @ wheels.

im assuming this is some sort of world record at 1bar of boost and that grade of fuel?
that is certainly not the norm for 1bar.

Even if it's accurate, the GT28RS car will spool quicker and make the car more driveable = faster. Modern turbos have taken a leap forward on driveability over 90s turbos

More to consider than just final BHP figure when it comes to changing the turbo,

[Ryan S]

The GTX28 will outspool a CT20 no problem, recently been out in a 3sgte with a GTX3071R and it out performs the CT20 on every level. spool up (with a front mount) was ridiculous so the GTX28 could surely only spool faster.
the CT20 is rubbish by comparison.

[Al-sw20]

So it should for the price. The ct20b is still the best all round turbo for the stock fuel system IMO. You could buy four of them for the price of a gt28 + bits needing to have it fitted.

[craig]

So it should for the price. The ct20b is still the best all round turbo for the stock fuel system IMO. You could buy four of them for the price of a gt28 + bits needing to have it fitted.

Agreed. Just because it's a mid 90s turbo, doesn't mean it's rubbish. It still gets my vote. My car my 320bhp @ 1.2 bar. Forged pistons, stock head, cams, fuelling. Exhaust, decat and cc. Mapped on apexi fc , premium unleaded.