Outer Limits 4x4 Board

Hi, I am currently re-building my 89 TD42 which had about 260k on it and running when i stripped it down. I got this motor cheep and wanted to re-build it so i can use it in my GU3.0 to 4.2 conversion.

As you know the TD42 is naturally aspirated and i am going to be running a GT3071R @ between 20-25PSI with a 12mm plunger modded fuel pump and gas injection.
Most of the engine rebuild shops over here in the west have not been to helpful and all use want to sell you a rebuild kit and although these seem OK i am worried the aftermarket pistons will not withstand the punishment they are going to receive.

What pistons do the guys with modded engines use?
The TD42t apparently has stronger pistons however the gudgeon pin is 30mm as opposed to the 28mm on the td42 and im not sure about the big end, don't know if you would need to change crank as well.

Ideally i would like to keep things simple and just get a full rebuild with pistons that are going to stand up to the punishment. Any help or idea would be great!
I was thinking i could get the normal rebuild kit pistons and send them off to get JETHOT coated has anyone done this?

Thanks in advance.
Ash

prety decent boost u wanna run is this a daily ?


pretty sure the 4.2 black top motors are stronger then the silver tops.

aaron

Glenn Binskins orange SWB had done over 160,000km on 26psi. It placed well in OBC and winch challenges also. It was driven hard and was still reliable.

Now the black top motor could be a GU TD42T or a light duty GQ TD42. There is nothing wrong with the silver top motors.

TD42's are a UD truck motor from 1983 and were originally turboed.

Joel at PGS has a tough TD42T and has done the HPS coatings on the internals as far as I know.

My TD42 N/A was manufactured in March 99 (plate on motor) and fitted into my DX GU wagon with a build date of December 99 (chassis plate). It is a "black top" motor.

Does that mean it is one of the stronger TD42's from the GQ era that may have been left over when nissan discontinued the GQ?

If so I will crank up the fuel and boost on the DTS turbo I have fitted from the current 9psi to 12psi for a little more power when towing my 1100kg camper??

smash250 wrote:Hi, I am currently re-building my 89 TD42 which had about 260k on it and running when i stripped it down. I got this motor cheep and wanted to re-build it so i can use it in my GU3.0 to 4.2 conversion.

As you know the TD42 is naturally aspirated and i am going to be running a GT3071R @ between 20-25PSI with a 12mm plunger modded fuel pump and gas injection.
Most of the engine rebuild shops over here in the west have not been to helpful and all use want to sell you a rebuild kit and although these seem OK i am worried the aftermarket pistons will not withstand the punishment they are going to receive.

What pistons do the guys with modded engines use?
The TD42t apparently has stronger pistons however the gudgeon pin is 30mm as opposed to the 28mm on the td42 and im not sure about the big end, don't know if you would need to change crank as well.

Ideally i would like to keep things simple and just get a full rebuild with pistons that are going to stand up to the punishment. Any help or idea would be great!
I was thinking i could get the normal rebuild kit pistons and send them off to get JETHOT coated has anyone done this?

Thanks in advance.
Ash

Over in Perth you may wish to speak to Cass Jones, he might be able to point you in the right direction.

However alot of the comp guys that have modified motors, with high powered diesel, best to speak with JPC in mebourne he may be able to supply you parts.

But with my motor i run 22psi, roller setup and my motor is stock it was factoy gutd42t... though..

GQGasPig wrote:My TD42 N/A was manufactured in March 99 (plate on motor) and fitted into my DX GU wagon with a build date of December 99 (chassis plate). It is a "black top" motor.

Does that mean it is one of the stronger TD42's from the GQ era that may have been left over when nissan discontinued the GQ?

If so I will crank up the fuel and boost on the DTS turbo I have fitted from the current 9psi to 12psi for a little more power when towing my 1100kg camper?? :twisted:

If you can measure the crank nut it should tell you, weak blacktop gq is 41mm nut and strong gu is 54mm nut.

can TD42 be turboed withouth piston changing ?

(EST)MahviaDeTyrk wrote:can TD42 be turboed withouth piston changing ?

yes

Hey guys, while on the subject with the right guys in the chat, i have a TD42 with an MTQ setup and very happy with it. I am in the middle of a ground up rebuild of the car (not the engine) and have an air to water top mount to fit in the next couple of weeks.

I was in at MTQ office in Melbourne today and i asked them about fitting a Blow Off Valve?? Is there any benefit? i have heard one on another and it was a winner.

MTQ dont reckon i would get any where near the pressure to set one off??? I find that hard to believe especially since they are adjustable.

Anyone got any thought on the need and or benefit? and which one to go for. Looking at the turbosmart veeport.

Cheers guys

Look'n 4 Mud wrote:i have a TD42
I was in at MTQ office in Melbourne today and i asked them about fitting a Blow Off Valve?? Is there any benefit? i have heard one on another and it was a winner.

Blow off valve on a diesel??? No.. no need. Unless you go the electronic fooly sik one.

there is no throttle body so there will be no pressure differential, which is how a bov works.

my ute, which has 3" dump and pipe ending just before the rear of the cab sounds like it has a blow off valve when you get off the throttle when its boosting hard, cant tell you why, obviously has to do with lots of air and no fuel, sounds good, in a wanky sort of way...maybe it was the same thing you heard? or you heard a petrol one?

you can use a BOV but you have to trigger it electronically and use the vacuum system to operate it. they usually use idle and clutch switchs.
effect is generally fairly small, it just helps to keep the turbo spinning while doing gear changes.
IMHO not worth the $$$.

BOV are a wanker factor. they do not improve performance do some research and u will find that out

they do actually work. a few guys run them with ok results. it just reduces the lag on the gear changes a little bit. they are on fairly well modded motors. especially if your running a big turbo that has a bit of lag.

tweak'e wrote:they do actually work. a few guys run them with ok results. it just reduces the lag on the gear changes a little bit. they are on fairly well modded motors. especially if your running a big turbo that has a bit of lag.

well im on the side who arent for BOV's



only my opinion..

you didn't read what i wrote before.......i wouldn't have one either, to expencive for minimal gains.

Thanks Guys, This is the research. LOL

Why go anywhere else.

Got all the info i needed with your replies. I knew the right guys were already in the room.

Thanks guys will bin the idea and just go with what i am doing without blowing a couple of 100 on a BOV.

Cheers guys.

Go Hard or Go Home.

money_killer wrote:BOV are a wanker factor. they do not improve performance do some research and u will find that out

Umm actually BOVs do alot.. (on petrols) they stop turbo surge the (hektic dose) that vl people think is cool but is really bad for a turbo.. also helps them spool quicker after a gear change..

and yes there is a mob that does diesel blow off valves but from memory they were like 400 bux.. just set up a waste gate properly so the turbo doesnt surge (Or Bark) and its ok

(EST)MahviaDeTyrk wrote:can TD42 be turboed withouth piston changing ?

I did my Turbo at 300+k and no dramas at all mate. pulls like a train. Gives a whole new life to the TD42 in the hill climb stakes turning 35's. You will love it.

Theres a post on here some were that some one mentions it was the mid 90s GQ black top motors that were weak,93-95 i think.dont know how true it is though.I think no one really knows.

Look'n 4 Mud wrote:

(EST)MahviaDeTyrk wrote:can TD42 be turboed withouth piston changing ?

I did my Turbo at 300+k and no dramas at all mate. pulls like a train. Gives a whole new life to the TD42 in the hill climb stakes turning 35's. You will love it.

Just thinking abouth turbo TD23 - I'm no sure pistons are strong enought - but I hope if TD42 non turbo pistons can work with turbo good then.... same family engine
maybe someone knows - are the TD23 pistons with steel ring carrier ??

SLASH wrote:Theres a post on here some were that some one mentions it was the mid 90s GQ black top motors that were weak,93-95 i think.dont know how true it is though.I think no one really knows.

93-95 they did something
then 95-97 they did something more.
thinning blocks out, much lighter pistons the answers are on here or patrol4x4
then the turbo GU motors were beefed up again, but i think the early NA were still the lighter duty motors, not sure on that though.
wouldnt wanna run 25 pound on a lighter built motor, and i dont know why you would want that much boost anyway.
i run 12 pound, make 120 at the tyres and only seeing 420 ish on the pyro.
thats with D-GAS and turned up pump, so i can still make a heap more power at that boost figure looking at pyro temps.
and thats non-intercooled.

love ke70 wrote:

SLASH wrote:Theres a post on here some were that some one mentions it was the mid 90s GQ black top motors that were weak,93-95 i think.dont know how true it is though.I think no one really knows.

93-95 they did something
then 95-97 they did something more.
thinning blocks out, much lighter pistons the answers are on here or patrol4x4
then the turbo GU motors were beefed up again, but i think the early NA were still the lighter duty motors, not sure on that though.
wouldnt wanna run 25 pound on a lighter built motor, and i dont know why you would want that much boost anyway.
i run 12 pound, make 120 at the tyres and only seeing 420 ish on the pyro.
thats with D-GAS and turned up pump, so i can still make a heap more power at that boost figure looking at pyro temps.
and thats non-intercooled.

Glad mine is a '92 LOL

for the bov i heard u need a butterfly setup or something not sure how that works

but also heard u can set a bov up through the brake booster but yeh not really worth the money

93-95 they did something
then 95-97 they did something more.
thinning blocks out, much lighter pistons the answers are on here or patrol4x4
then the turbo GU motors were beefed up again, but i think the early NA were still the lighter duty motors, not sure on that though.
wouldnt wanna run 25 pound on a lighter built motor, and i dont know why you would want that much boost anyway.
i run 12 pound, make 120 at the tyres and only seeing 420 ish on the pyro.
thats with D-GAS and turned up pump, so i can still make a heap more power at that boost figure looking at pyro temps.
and thats non-intercooled.

_________________

Dude your probably right,real shame really coz ive got a 98 GQ coil cab so i have a weak one.I tend to agree with you on the high boost factor.My old GQ had a DTS kit in it running 12psi & i think it went really well.As for my coily it only has a CT26 toyota turbo on it & it is supposedly running 10psi,not sure coz have no boost gauge yet but thats what the previous owner said anyway,but it goes reasonably well for what it is.Not as good as the old GQ but i think i can do a little more tweakin without sacrificing reliability.Maybe D-GAS like yourself coz your figures sound very impressive without going over the top.Cheers Loz.

wait til i get it back on the dyno, then im gonna intercool it, i can see 150 at the tyres at about that boost level, and see how long it holds together
doesnt spend alot of time at full throttle, it loves mid throttle and mid range revs, pulls like a 15 year old

Fairly sure pre Aug 92 had the heavier pistons and rods with oil squirters, after that they lightened up to gain HP NA.
I have a 88 SWB Water Air IC 160RWHP with GU pump and running 20PSI for 12mths 50k now no problems, EGT's max 450C after turbo.
If I was going to run 25+ PSI I would rebuild with H beam rods from JPC, get the pistons coated, balance, look into getting four bolt mains but not sure if you can fit them in a TD42 with the block skirts? Line bored.
New head ported with bigger valves if posible, can anyone enlighten me if thats possible and see if you can get some type of after market performance valves for diesel, ie sodium filled etc. Custom cam grind.
Just my thoughts, the guys who do this stuff for a living don't like to give away there secrets. I'm sure someone here will know more than I do and can probly piss further too.

300WinMag wrote:Fairly sure pre Aug 92 had the heavier pistons and rods with oil squirters, after that they lightened up to gain HP NA.

Correct as far as i'm aware, have read heaps of threads on this. Silver tops were the heavier design pre 92. Post that they changed to lighter pistons etc except factory turboed black top motors (GU) which were put together with heavier gear. Safari's factory turbo GQ were silver top with heavier gear as well.

I have a 12/92 coil cab with silver top motor and girls wagon is 4/92 with silver top also. I think it is Aug 93 is the change over as these are 94 models.