how much boost???

hey all, im yet to instal a boost gauge but how much boost should my car be running, and also how much could i boost it to without problems, i have been offered another bigger turbo like twice the size for free but i dont wanna run the same pressure and have massive lag, anyone know what a safe range would be, Td27, with terrano turbo swap im guessing, got around 360'000 on clock
cheers

Stock turbo setup will run around 7Psi.
My terry engine runs around 5psi and when it fells like it runs around 8psi.

id say it would be fine up to 10psi without an added intercooler.
Add an intercooler and you could run a few PSI more.

you don't want a large turbo on your diesel, it will just be laggy and you wont be able to use the power.
Do you know what size turbo it is?
Ive read a thread of this guy using t28 silvia turbo and running 20psi on his td27... i cant find the thread now... but id say that's the largest turbo you would want to use on a 2.7l diesel.

I personally would not run more than a bar on mine (14.7psi)
when my turbo finally gives in (wont be to far away), ill swap it for a t25 Silvia turbo and run about a bar.

goodluck

awesome thanks mate, ill get a boost gauge soon and see where i stand, then hit up a bigger turbo if needed or get an intercooler, top mount or front mount better?

soooo, come to the conclusion my turbo is kaput, any ideas on what turbo to run? its got a garret a/r80 in atm,
that ran well

im running 18pis no problem's so far

passenger pete said:

im running 18pis no problem's so far

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How long have you been running it like that? Has the fuel been tuned to suit?

16 mounts and fuel tuned to suit, it a bit rich off boost but clears fast egt seams stable when checked. should get around to mounting a egt gauge inside.

passenger pete said:

16 mounts and fuel tuned to suit

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I mean like how many kilometres have you done in the car with that set up?

Was it tuned just on EGTs or was it on a dyno?

Dion said:

I mean like how many kilometres have you done in the car with that set up?

Was it tuned just on EGTs or was it on a dyno?

Click to expand...

turned only on egt have not got around to a dyno yet. have run 18psi about 12,000 kms was parked up a bit. 14psi before that about 50,000 the relief valve will let go at 14psi so untill ya change that ya stuck with 13.5psi

rohan93 said:

hey all, im yet to instal a boost gauge but how much boost should my car be running, and also how much could i boost it to without problems, i have been offered another bigger turbo like twice the size for free but i dont wanna run the same pressure and have massive lag, anyone know what a safe range would be, Td27, with terrano turbo swap im guessing, got around 360'000 on clock
cheers

Click to expand...

Twice the size? Well the stock turbo size AFAIK is a t2, so a t25 is more than big enough. We can only get to about 4-5g at red line, which is barely using the turbo's capacity. Getting a t28 is a waste of time, IMVHO. I'm going to upgrade to a t25 (since I have a spare one at home, and it's just been rebuilt). Remember we want the power ASAP when driving, and we're not going to get it when we run big turbo's with plenty of lag.

As far as an IC, can you fit a FMIC? I have a TMIC, couldn't fit one at the front.

Also, anyone got ideas about rotating a turbo? Everythings good to pop my new one in, except the oil and coolant lines won't match up, they're set up for a ca18det, not a td27.

I have a T25 in mine. boost come on around 1,200rpm.
To rotate the turbo you will want the oil feed facing up and the drain downwards.
If my memory serves me, the exhaust housing should have some bolts on a metal plate that you can loosen and rotate the center. The air side should have a big C clip which you will need to squeeze.

Bvandermaat said:

I have a T25 in mine. boost come on around 1,200rpm.
To rotate the turbo you will want the oil feed facing up and the drain downwards.
If my memory serves me, the exhaust housing should have some bolts on a metal plate that you can loosen and rotate the center. The air side should have a big C clip which you will need to squeeze.

Click to expand...

Yeah, the oil feed and return lines are horizontal at the moment, not vertical. So it needs to go 90 degrees south.

The wastegate seems easy enough to unscrew, but how do you undo the crap from the turbo? All I see is two thin metal plates that are kinda crammed in there. If I can do it myself I will, but I was thinking I may just need to get it to a performance shop to do it.

Not sure if yours is the same as mine but here are a few pics. Where are you located. There is a bloke in Gaven that built my turbo for me. MRT (Mr Turbo) is the business name.




Might have to get a different actuator if you need to rotate the air side.

My turbo sits low mount, not top mount. But still, thanks for the pics! It's almost identical, except I don't have fancy paint on mine.

I just need to rotate the middle part where the feed lines come in, between the turbo and wastegate.

That's the clip that needs to come out, how do I do it? The bolts are obviously easy as pi, but can I just remove the clip with plyers or something?

It's actually making me excited, I have a boost gauge and controller to compliment a new turbo, hopefully I can see some power when coming up hills.

My memory is bad at best so I can't remember if you need to spread them or squeeze them. Should be able to do it with needle nose pliers in the two holes the clip has.
Take some pictures once its all done, would be good to see.

I'll give it a go tomorrow. The wastegate will be piece of piss, however if I can't figure out the turbo I might just stop by a shop and ask them to do it.

Went to an engineer's shop who had circlip plyers, he cracked it for me (for free).

Took the bolts off, rotated the centre. Jammed the circlip back in with a screwdriver and did up the bolts, now I'm half way through taking off the turbo. The engine is still a bit too hot to work on, though.

What a pain in the arse. Just to let everyone know, a t25 off a silvia is not compatible with a td27. At all.
Firstly, the wastegate doesn't bolt up to the dump pipe. I had to basically makeshift some bolts and its held there with two bolts, and there is a slight gap so it's noisy.

Secondly, the oil return line is a different size. Luckily I had a spare oil return pipe, and I had to cut both of them, put a piece of hose in between them.

Thirdly, the oil feed line is different. I couldn't use anything at home, I had to go to a brake specialist, get a piece made up with some metal piping.

The coolant return line didn't line up due to the size of the turbo obstructing it. I had to chop the lines, put some hose in it to get a flex that would work.

The intake part of the turbo requires a hose (where the t2 uses a bolt on joint), and the hose was obstructed by the alternator. I had to cut the hose up, move things round and just squeeze it in. This, then in turn, caused issues with getting the additional piping sorted.

A bolt snapped off from the exhaust manifold, and the bottom right corner bolt is impossible to fit.

The coolant feed line was obstructed, which then again needed to be chopped and put a hose in between to create a flex joint.

All in all, this was a pain, it would of been 1000x easier to just buy a stock turbo and put it on.

But all works now, hopefully nothing will break down.

That sucks man. You listing all the problems have brought back memories of my own install.Thought there might be some custom hose work needed.

With the exhaust side. I needed a Garrett Turbo Adapter T3 T2 to match it to the QD32 Manifold. It was only $90 off MR Turbo.

For that bolt that wont fit I had to get a socket head bolt cut down and then cut an allan key to fit in to tighten it.

With the oil return you will want the biggest possible to get hot oil away from the turbo.

Did you take any pictures? I would be glad to help out if you needed it and are in the SE Queensland area.

I think I have a pic or two. I didn't bother playing with pictures as I was too frustrated trying to get things to work. But it's running fine now. The main difference is that I really hear the turbo whine, it sounds like a jet engine now (but I presume this is fairly healthy). Plus since the wastegate and the dump pipe are not properly sitting together, it is a bit louder. Not a great deal, but enough to notice. I have a spare t25 dump pipe, I might take the dump pipe to an exhaust shop and see if they can just chop the t2 dump and the t25 dump and weld it together?

http://imageshack.us/photo/my-images/27/img02501d.jpg/
http://imageshack.us/photo/my-images/221/img02511q.jpg/
http://imageshack.us/photo/my-images/190/img02541f.jpg/

those are the pictures I did take. You can see the difference between the old and the new turbo (take a guess), and the two return lines difference in size.

You have any experience on how to remove those two way bolts, that screw into the wastegate, dumps, exhaust etc? You can undo the nut, but then the bolt sits there, and plyers just won't do the trick.

Thanks for the offer, but I am in Melbourne, bit of a hike! But she's running anyway.