Turbo A K Series Motor.

[InTrenches]

So every week i come on the forums and see a differant "how do i turbo my k motor?" and the reply always seems to be "use the search function"

 

however there really are no walkthroughs (bar one, but it isnt very good, and is very negative towards the idea of a turbo K motor.

 

So, here are some quick walkthroughs on turbo setups for K series motors.

 

*All of the following ideas will be costly, and wont result in huge power figures*

 

*The first thing to keep in mind about a turbo is that your K series motor (if stock) will probably not handle any amount of boost you throw at it. your head gasket will be the first to go, to overcome this you can either run 2 copper gaskets or a metal gasket, however then you put strain on your pistons and rods etc, (in short lots of things with have to be replaced on a regular basis unless you put money into the right parts)

 

Onto the setups:

 

1: The first and most obvious way to turbo a k series is using the conventional method of a turbo forcing boost directly into the pots, then injecting fuel via injectors then igniting, lthe same as the following engines (ie. RB20DET (skylines) CA18DET, SR20DET (silvias) 1JZGTE (cressidas etc)

 

to do this your going to need the following:

 

exhaust manifold that will fit to the dump pipe of your turbo

the turbo itself

4K-E inlet manifold with injectors

a blowoff valve with boost regulator

a wastegate

maybe even an intercooler

 

then you need to think about oil lines etc etc.

 

ive never actually seen anyone with this setup, regardless of lots of people on these forums telling me stories.

 

due to the latter i cannot comment on power increase etc.

 

2: Option two is a "blow through" setup, this is where you set up a turbo as usual however insted of using a fuel injected system you vent the boost to the top of your carby, this can be tricky because often boost is leaked from seals in the carby and conection. its recomended you make an air tight box from steel, or a materiel alike, then house the carby inside, then you can eliminate some of the places that will leak boost.

 

however you can buy an inlet manifold designed specifically for this, i forget the name however.

 

3: The third option is "suck through". Again same set up as normal however you need to find/make a manifold to link "out" or bottom side of your carby to the intake of the turbo.

 

however you will have to buy a turbo thats capable of passing fuel, i forget which ones can, i think from memory its the ceramic wheel ones. (please correct me if wrong)

 

so from now on, no of us should have to see any more new topics asking how to turbo thier k motor.

 

 

 

just ask question in here.

 

 

 

ps i can't be arsed proof reading this shit, so expect mistakes.

[Mitch-12]

the carbon seal turbos are used for suck through any turbo can have a carbon seal i think

[InTrenches]

the carbon seal turbos are used for suck through any turbo can have a carbon seal i think

thats the one mitch cheers

[white_sandshoe]

rough calculations for power figures basically involve multiplying your power figure by the amount of boost you plan to run...

HP + (HP x BAR) = ?

eg; 3K = (60hp - 30 years of wear and tear = 45hp) + (upper limits of boost 0.5Bar (or 7psi)? x 45hp = 22.5hp) = 67.5hp?

 

what ever power figures you start with, is the figures your boost will multiply, in theory... (stupid big cams and crazy porting might give you good numbers, but they won't be any more drivable while adding boost... there's a lot more to turbo theory than that...)

 

 

Then, once running boost, as with any engine, it's only as strong as the weakest component.

[Taz_Rx]

Hey buddy. Its really good that you've taken the time to write something up! :bash: But no offence, there's not a whole lot of accurate informative info there. Plus there's a few obvious errors.

 

Hopefully I won't be very busy at work later this week so I might endevour to re-write/add to your thread.

 

As for this...

 

ive never actually seen anyone with this setup, regardless of lots of people on these forums telling me stories.

 

This make me think that you've never really used the search function here much. If you had of you would have found my thread....

http://www.rollaclub.com/board/index.php?showtopic=10940

[phat_20]

Nice one Si....I've been using the rolla club to research about k turbo setups and there is heaps of info. This is probably the best forum for it.

 

Regardless of 'InTrenches' comments, I'm still pro turbo K motors.

[InTrenches]

Nice one Si....I've been using the rolla club to research about k turbo setups and there is heaps of info. This is probably the best forum for it.

 

Regardless of 'InTrenches' comments, I'm still pro turbo K motors.

not sure what you mean by intrenches comments, I'm not against turbo k's what so ever. i plan to turbo my 5k.

[InTrenches]

Hey buddy. Its really good that you've taken the time to write something up! :bash: But no offence, there's not a whole lot of accurate informative info there. Plus there's a few obvious errors.

 

Hopefully I won't be very busy at work later this week so I might endevour to re-write/add to your thread.

 

As for this...

 

 

 

This make me think that you've never really used the search function here much. If you had of you would have found my thread....

http://www.rollaclub.com/board/index.php?showtopic=10940

in my defence i this was a very quick and rushed effort to very briefly cover some options for turbo k's.

 

i have used the search function but it often doesnt return good results unless the correct key words are used.

 

but anyway it would be great if someone like yourself with experience and photos to go with made a decent thread and pinned it, then we wouldnt have to have so many new threads about turbos.

 

cheers Isaac

[ninja-philbo]

like go rite threw fuel systems as in fuel pumps surge tanks regs carbys things you have used and has worked .. ive done alot of searchin and get abit cranky cause i can't find what i want..

[Taz_Rx]

Fuel system stuff has been up for ages......

 

http://www.rollaclub.com/board/index.php?showtopic=17418

[ke70dave]

like go rite threw fuel systems as in fuel pumps surge tanks regs carbys things you have used and has worked .. ive done alot of searchin and get abit cranky cause i can't find what i want..

 

yeah but such a document may be 400 pages long.

 

for example fuel systems arent specific to any sort of engine setup, so they shoudlnt be lumped with the "turbo K motors".

 

with this type of thing its not such a matter of knowing what parts to use, its understanding why things are used.

 

understanding how a fuel pressure regulator works is going to be much more usefull than just knowing that "*so and so* uses this regulator so therefor it must be right"

 

adding a turbo to a car that never came with one isnt exactly an easy task, its essentially reinventing the wheel for that engine, custom parts everywhere.

 

especially something like a K motor which in reality doesnt lend it self very well to being turbod (a 1.3L pushrod bullet proof slow as thing in standard form), its just such a simple engine that adding the extra bits for the turbo is fairly *easy*.

 

i don't know if you can really expect the people in the know to just spoon feed the information (for lack of a better word).

 

this is why members rides are a good idea, showing off what people have done to their cars to give others ideas and motivation to do theirs as well.

 

seems to be a bit of a problem lately where people just want easy answers and arent really interested in actually understanding what they are adding to their cars.

 

ive had a look through taz's members ride, and there is so much information in there. and with good pictures too.

[white_sandshoe]

Hear Hear ke70dave.

 

In many instances, people need to crawl before they can walk, before they can cut sick skids in their turbo K powered rollas...

 

Understanding the relationship between fuel pressure and boost pressure, and the necessity of a boost referenced pressure regulator, right through to ignition timing and control, and even re-setting timing curves...

 

Understanding not only how a standard combustion engine works, but the differences between how a carbied, naturally aspirated engine, and an EFI, boosted engine operate... These are things we should all hunt for some understanding of.

 

Not just, what will bolt up and make me go fast.

 

Actually, that's one I only just stumbled across... The difference in ignition timing between N/A and boosted engines. Wow, did it blow my mind. Even now I still don't get all the details to be able to explain it properly, so I'll just suggest people search up on how (and why) to re-curve dizzies... :D

 

While I am included in the list of people that are getting sick of noob questions, I can understand sometimes it's hard to know what to search for.

 

But to me that is just saying, there's more homework to do so you CAN know what to look for.

 

 

Confucious say; One must know the questions before one can seek the answers...

[Taz_Rx]

Actually, that's one I only just stumbled across... The difference in ignition timing between N/A and boosted engines. Wow, did it blow my mind. Even now I still don't get all the details to be able to explain it properly, so I'll just suggest people search up on how (and why) to re-curve dizzies... :D

 

And there's factors like Compression ratio that can serious effect the timing. I was have a conversation with Daim...... http://www.ae86drivingclub.com.au/forums/s...GTE-KE70/page23 just the other day actually about what timing we were running on boost. He runs pretty much stock 4AGZE CR and can only run around 13-14* from memory with 18'ish psi. With my 8:1ísh CR I can wind in up to 28* with the same sort of boost. He alos mentioned another guy with a worked R32 and he can't run any more than 7* at full boost in that without it pinging!!

 

FYI - I do plan on the new FAQ article having pretty much all you need to know to boost your K. However if there's any theory type thing I think is very generic I'll just be suggesting a wiki or google search.

[ke70dave]

Confucious say; One must know the questions before one can seek the answers...

 

It's the question, Neo. It's the question that drives us. It's the question that brought you here. You know the question, just as I did.

 

hehe oh i love that movie.

 

annoying part about all the information in the FAQ is that it doesnt get read much, evidently (not in reference to this thread, fairly general statement).

 

stacks of good info though thats for sure.

[philbey]

It does get read, lots of people who ask these question have read it.

 

The "building a tough K motor" article is a great read, but it's a high level "why and what to do". It doesn't really tell someone where to start with their mods. Lots of people can't afford to dive straight into a complete buildup.

 

I'm planning on writing a follow up article for it, as more of a step by step start here - finish there document. Focusing on the fella who wants to progressively improve his performance without 3 months of downtime while he pullls the motor out and rebuilds it.

Edited May 21, 2010 by philbey