gbentink Turbo Upgrade Users Thread (2 Viewers)

[SAM1HDT]

Maybe not a big issue with a torquey 1hd-t. In my 105 with NA 1hz,fitting larger tyres had me cruising at 2500rpm(previously around 27-2750 rpm), if I came to a hill and revs were dropping, I'd be downshifting before 2200rpm (right on peak torque ). That slight drop in rpm occurred far more often than you'd expect.
Larger tyres lowered cruise rpm, but you're at that rpm less due to down shifting. Economy went backwards

Adding bigger tyres isn't always the best way to lower rpm if just casing better fuel economy. Usually they are heavier and have more rolling resistance.

Changing diff gears to 3.54/3.73 is lowering power to the wheels, but I think in my case, and probably any turbo or petrol cruiser actually. We already have more then enough power at these high rpm to keep the tyres turning quite easily at high speeds.

They are bloody expensive gears though. So I don't think I will be trying them out in a hurry.

 

[zipdoa]

Important note it's 1HD-T rely more on boost to low end .. compression number are lower compared to 1HZ and that's why IMHO a 1HD-T will be happy with low end boost ..

From what I've read, it appears the Grunter will come on boost a bit quicker than a CT26, and the Badboy will come on boost about the same as a CT26.

Graeme mentioned that most Grunter Extreme buyers end up upgrading to a Badboy down the road.

This is the most difficult turbocharger purchase decision i've ever made!

 

[ForealBoreal]

Just go badboy.

 

[SAM1HDT]

Who has a bad boy turbo? At what rpm can you achieve your maximum boost? Toyota speciations are that maximum torque for a 1hdt is at 1400rpm, but my bad boy doesn't do much until 1800rpm and by 2000 it is full boost.

 

[Dougal]

From what I've read, it appears the Grunter will come on boost a bit quicker than a CT26, and the Badboy will come on boost about the same as a CT26.

Graeme mentioned that most Grunter Extreme buyers end up upgrading to a Badboy down the road.

This is the most difficult turbocharger purchase decision i've ever made!

Keep location in mind too. Most of Graemes customers will be in Australia which is one of the flattest countries on the planet. Virtually everyone is at sea-level.

As you go up in altitude spool gets later and surge can become a problem. Australians don't have this problem. If you deal with altitude I'd be going for the Grunter.

 

[IanB]

Keep location in mind too. Most of Graemes customers will be in Australia which is one of the flattest countries on the planet. Virtually everyone is at sea-level.

As you go up in altitude spool gets later and surge can become a problem. Australians don't have this problem. If you deal with altitude I'd be going for the Grunter.

That's a very interesting point that I've not seen brought up before.

 

[ForealBoreal]

the 18g isn't is as bad as you think. You'll be fine with a bad boy.
The Badboy extreme gets the surge flutter.

 

[AussieHJCruza]

I get almost 20 psi from the badboy as the dyno pull starts at 50 km/h in 4th, which is 1500-1600 rpm

 

[Dougal]

the 18g isn't is as bad as you think. You'll be fine with a bad boy.
The Badboy extreme gets the surge flutter.

You've got two things going on there. One is the bigger compressor. The other is a bigger turbine.

I don't see the point in going to the 18G compressor unless you're running high boost and high rpm. Otherwise you're just losing efficiency.
The bigger turbine means a bigger hole with no boost down low but better top end performance.

IMO unless you're into throwing mud, sand or snow you're better with the smaller turbo. If you drive at altitude you'll do far better with the smaller turbo.

 

[Dougal]

Righty, I finally threw some brain smoke at this and spent a couple of hours crunching numbers.

At 80kPa (about 2000m altitude) I reckon an 8cm TD06H-18G will surge at around the 1500rpm mark. You'll be fine once you get past about 2000rpm but you'll also risk overspeed if you're boosting it around 22psi.

If you've got an 18G wheel with extended tips that's probably enough to tip the balance at that altitude to save it from surge and prevent it from overspeed with a 22psi wastegate. But as you go higher it's going to become worse.

The TD06H-18G-8cm at sealevel looks like quite the beast. But peak torque will only arrive at about the stock RPM (2200rpm). Where the TD05H-16G-8cm will bring it up closer to 1500rpm. Both these with 22psi boost should deliver around 600Nm.

If anyone wants me to crunch some other numbers for them. They can come and paint my truck so I can get it back on the road while having time for their work. Alternatively I have worked for turbo parts.

 

[zipdoa]

You've got two things going on there. One is the bigger compressor. The other is a bigger turbine.

I don't see the point in going to the 18G compressor unless you're running high boost and high rpm. Otherwise you're just losing efficiency.
The bigger turbine means a bigger hole with no boost down low but better top end performance.

IMO unless you're into throwing mud, sand or snow you're better with the smaller turbo. If you drive at altitude you'll do far better with the smaller turbo.

Not sure I understand this science. Altitude was one of the concerns I mentioned to Graeme, as I live at about 1000m and will travel as high as 3200m when travelling through Colorado.

Wouldn't a larger turbo make more sense, as it will be able to compensate for the decreasing amount of oxygen at altitude by providing more boost?

 

[ForealBoreal]

The badboy not the extreme is still running the same turbine wheel, just slightly larger turbine housing than the grunter extreme.

You'll be fine with the badboy if you want exactly what you said for the turbo to come on like your current one.

Dougal prefers small turbos. Graemes line is proven, your in good hands

 

[gerg]

3200m is high. Surge isn't very forgiving at a constant speed. It's not like accelerating where it's short lived.

 

[Dougal]

Not sure I understand this science. Altitude was one of the concerns I mentioned to Graeme, as I live at about 1000m and will travel as high as 3200m when travelling through Colorado.

Wouldn't a larger turbo make more sense, as it will be able to compensate for the decreasing amount of oxygen at altitude by providing more boost?

At altitude the air is thinner and needs compressed more to make the same boost. Your compressor has to deliver a higher pressure ratio to make the same boost numbers but has less air-flow while doing that.

The combination of lower flow and higher pressure puts larger compressors into the surge region. Surge is a big problem but even if you avoid surge it means you're operating at very low compressor efficiency. A smaller compressor both avoids surging and runs at better efficiency in these situations.

The only solution to get good spool and boost capacity at altitude is compound turbos.

 

[gerg]

Which is why old school piston engine planes ran turbo super chargers I assume?

 

[Dougal]

Which is why old school piston engine planes ran turbo super chargers I assume?

Yep, high altitude was a major problem for piston engines. But superchargers also helped a lot on takeoff.

I'm doing all my own turbo sizing now at sealevel and 2000m altitude. It's easy to find a turbo that'll deliver the goods at sealevel. It becomes a real challenge at 2000m.

 

[AussieHJCruza]

Hey Fellas,

Got my 80 back with a BadBoy today, and I would like your comments - at about 1600 rpm I hear, presumably coming through the snorkel, what I wonder if it could be surge. Sounds a bit like ch-ch-ch-ch. It only does it for about 100-200 rpm.
AFRs are approx 20:1 to 21:1 above 1500, a little lower below that.

EGTs also seem quite high - I can get 700 degrees pre-turbo with no difficulty.

What do you think? Re the EGTs, I'm thinking the pump could be losing advance, and therefore EGTs go up, but I don't know.

 

[mudgudgeon]

700c pre turbo is ok. Getting toward the upper end of ok, but still ok.

 

[AussieHJCruza]

Yeah, but she'd go quite happily above that I reckon

 

[Locked79]

@AussieHJCruza. Sounds exactly like what mine was like before the antisurge housings. Does the boost needle bounce around when making that noise? Does yours have the antisurge housing?