CT26 How to make it spool at lower rpm?

[RufusTheDufus]

disagree, blocking the wastegate does not make the turbo boost lower.

I didn't say it would. I said it will make the engine build torque sooner in the RPM range thus making the seat-of-the-pants-o-meter indicate boost is building faster.

the wastegate will not open till the max setting has been reached, once it does then it will open. otherwise the wastegate is redundant.

That's only true with a boost controller interfering with the pressure that's allowed to reach the wastegate diaphram . Without a boost controller the wastegate starts opening much sooner. A pressure sensitive diaphragm controlled by spring resistance is not an on/off switch. Pressure builds against the spring and it starts opening way sooner than the fully-open, max boost setting. It's not like it snaps open upon reaching a maximum value.

He needs the proper turbo for his desires, all this other playing around is just a waste of time and energy.

I agree, however I don't think the turbo is his problem. He's using the stock 13B-T turbo. He's only able to make 2 - 5 PSI max at any engine speed and load. I think he has an intake leak on the pressure side of the turbo or too much restriction on the suction side.

 

[crushers]

ummm, so i read his first post and he SEEMS to be trying to get full boost on the flat in second gear...
go try the same thing on a hill pulling some weight behind you and see what the results are.

 

[danhr]

Wait... let us get the topic straight. 'How to spool CT26 at lower rpm'.

I am not looking for CT 26 making say 26PSI at or more than 3000rpm. The max PSI I want is 14.

I do get more than 16PSI when waste gate is disconnected (blocked). However, that above 3000rpm. I have shimmed the wastegate with 5 washers each of 5mm. Totaling 25mm of wastegate pull. I see boost of 10 PSI when in 3rd gear @ 3000rpm. The boost build up is same... I see buildup of boost after 2200rpm.

Adding another shim results in PSI of slightly more than 16.


* This increase in boost I saw after increasing the fuel to the max. No early spool though. Also, when I hit 16PSI I hear the turbo make whining sound.

 

[Dauntless]

If it's taking until 3000 rpm to get full boost on an engine which only revs to 4000 or so, and it's the stock turbo, then I think you either have a blockage somewhere, or the compressor or turbine is not working as it should.

 

[crushers]

once again i will ask, is this on the flat or on a hill with load?
on the flat is is very hard to create the boost you want but on a steep hill it is easy to create 14 psi at low RPMs.
my turbo will barely make 9 psi on the flat with a heavy foot but as soon as i am towing or hit a hill i can hit 14 psi no problem.

 

[danhr]

crushers:

Flat road. So then it seems 13B-T is at its limit?

In 1KZ-T I notice the spool right at 1000 and at 1200rpm it is full 12PSI of boost when pedal to the metal, straight road. It has a CT12B turbo. No black smoke at all and stock fuel settings. Also noticed that EGT goes below 390F soon as there is full boost. I have seen below 390F while driving at 120KM/h with full boost!

The 13B-T, has high EGTs as compared since there is no boost buildup.

 

[Tapage]

I never got the 13BT experience .. but my 1HD-T make full boost under 2K rpm .. no matther what ( load or no load but in gear .. ) if you flat the gas pedal ..

 

[crushers]

give it a try on a hill or hook a trailer behind it with some weight in it(3400 lbs shoudl do the trick) and go try again...

 

[Dougal]

Even a much higher gear would help. Like 4th.

 

[crushers]

true, very true.

 

[danhr]

I'll see to that. But then it also means that CT26 is not so good match on 13B-T and the issue remains as it is.

 

[crushers]

you really don't understand turbos and diesels.
it really is just that simple, might be best if you go buy a gasser and call it a day.

 

[danhr]

crushers:

I never knew that 13B-T is meant for to tow heavy load. If I infere correct that is... the turbo will produce more PSI per more load and since this truck isn't designed for high speed... This is interesting.

All I had in mind is diesel produces torque at lower rpm and since the turbo spools at much higher when there is no load... got me all mixed up. BTW 13B-T produces max torque at 2200 ... isn't that a little too high?

This is just a question ... crushers what do you do?

And how would you compare a 1KZ-T to a 13B-T?

 

[crushers]

what do i do?
i rebuild, modify, refurbish and maintain and import Land Cruisers. i have for the last 30 years. it has been my full time job since 1995.

the turbo can produce boost at a low rpm if it is under load... it is heat that gets that puppy working.
the problem with second gear and pin it is there is little heat being produced. take your 13BT out for a drive, go through first, briefy into second, then into third and once engaged floor it and watch the boost and pyro climb. it is the load you are putting on the engine that is doing this.

if, i suspect, you want quicker performance, quicker acceleration then you will need to go to a smaller turbo or maybe even dual turbos.
the 13BT has a max suggested rpm of 4100 rpm. at 2200 rpm you are bearly making the old girl work.

<side note, i am not trying to come across as a know it all. i am still learning and hopefully will for a long time to come>

 

[crushers]

as for comparing a KZ to a 13BT, i have no experience so i will have to leave that question up to the Oz boys.

how does it compare to a PZTI? the PZ is smoother, quieter and better on fuel. the PZ is rated for 4700 rpm (i heard one guy state 5100 rpm but that would scare the crap out of me) and in stock configuration the PZ is a nice engine. the reason i compare the PZ with the 13BT is, although the PZ is a 5 cyl, the displacement is very close. the 13BT is 3431 cc and the PZ is 3469 cc. close enough to compare apples to apples. the PZ turbo'd will rock your world but still have the grunt that you need for off road.

 

[Tapage]

the 1KZ-T it's smother quiter and faster .. but not stronger .. here they come with lot's of head problems and wonder what .. 13B-T ( the few ones that we got ) are still running strong ..

 

[Hulsty]

I dont know if its worth much to you, but last night I was flat towing my mates car behind my BJ74, I am running 35'' tyres, H55F and 4.11 diffs, weight around 2600kg ish towing a 3000kgish Nissan patrol up some long moderate hills. Boosting 10psi by 2000rpm, hitting 13.5psi at 3000rpm. Pyro post turbo between 450C-520C using mostly 3rd and 4th gears, crusing up most grades in 4th at 2100rpm. Was very pleased with how easily it towed the weight.

Exhaust and fueling are stock as far as I know, with only the muffler removed from the stock exhaust.

 

[Dougal]

I dont know if its worth much to you, but last night I was flat towing my mates car behind my BJ74, I am running 35'' tyres, H55F and 4.11 diffs, weight around 2600kg ish towing a 3000kgish Nissan patrol up some long moderate hills. Boosting 10psi by 2000rpm, hitting 13.5psi at 3000rpm. Pyro post turbo between 450C-520C using mostly 3rd and 4th gears, crusing up most grades in 4th at 2100rpm. Was very pleased with how easily it towed the weight.

Exhaust and fueling are stock as far as I know, with only the muffler removed from the stock exhaust.

That's a good baseline, thanks.

Are your injector pump tags still readable? It'd be good to find out what that pump is and what it should be capable of.

 

[Hulsty]

When I get a chance i'll check the pump probably in the next few days, hitting the cans and some food now. Currently on a 4x4 trip in tassie and just completed a rebuild and engine swap of a TD42 in 23hours bloody top effort!

 

[Dougal]

as for comparing a KZ to a 13BT, i have no experience so i will have to leave that question up to the Oz boys.

how does it compare to a PZTI? the PZ is smoother, quieter and better on fuel. the PZ is rated for 4700 rpm (i heard one guy state 5100 rpm but that would scare the **** out of me) and in stock configuration the PZ is a nice engine. the reason i compare the PZ with the 13BT is, although the PZ is a 5 cyl, the displacement is very close. the 13BT is 3431 cc and the PZ is 3469 cc. close enough to compare apples to apples. the PZ turbo'd will rock your world but still have the grunt that you need for off road.

It'll take some factory BSFC numbers to convince me that the PZ engines are more efficient than the 13BT. The combination of indirection injection and one more cylinder both head towards a quieter, smoother but less efficient engine.

However, given the massive variation in how people dress up and use their cruisers, it's still possible to have a PZ engined cruiser using less than a 13BT powered one.

Hopefully the fuel pump numbers will give an idea of what a reasonably stock 13BT is capable of.