TD42 Performance

Post by **bigbluemav** » Wed Sep 03, 2003 4:22 pm

Afternoon all

I've gone off the idea of a turbo for my Mav' due to $$, I'd rather spend the money on air lockers, better suspension, transfer case gears etc. etc.

What's the story with extractors 2.5" exhaust system, (been told 3" is too big and loses power/torque) , what type of mufflers to use etc.

I've yet to put a snorkel on, I realise that this will be good for a few NM's. Other improvements I have on the agenda are to reset tappets (how do I turn the engine over to do this???) and renew injectors and overhaul injector pump (I realise big dollars, but its maintenace and required every few years anyway).

Any more ideas out there in Nissan land??

Post by **Hoonz** » Wed Sep 03, 2003 9:43 pm

spend the money on airlockers and crawler gears

u have plenty of torque to make it already .... then save for a turbo and work the engine

snorkle is a must

Post by **Area54** » Wed Sep 03, 2003 9:58 pm

Naturally aspirated and TD42 power are not usually words associated together! :lol:

No seriously, pm BIG_NISSAN about the queries on the exhaust etc. Extractors and 2.5 are a perfect match.

Tappets - invest in a big socket (not sure on the size) just remove the glow plugs to remove compression (be sure to blow around the glow plugs with compressed air to clean around them before you crack them loose).

Injector nozzles are an item every 100,000 k's anyway, get the injectors set up requiring slightly more pressure than standard (a new injector nozzle cracks open at 1490 - 1630 psi), to open. I'm told this atomises the fuel better (can't tell - i can't see inside the motor). The pumps are pretty good unless it's done a zillion k's or its had a gutfull of water. I had water go through the pump, cost about $1700 to repair new camplate and rollers and a heap of little bits (main damage) - (I've since done some research - I think I got ripped) I also had new nozzles fitted, and some other stuff - so its hard to say. Rebuilt pump changed the vehicle for the better. IMO the fuel system should be checked out before a turbo installation anyway, so if you reco the fuel system you will save in the long run. Could prob advance the pump slightly (even if natural aspirated) to account for the decrease in exhaust back pressure.

Air Filters - K & N in the precleaner (with an old stocking over it keeps out the bugs that the snorkel directs in there) and finer filter in the main air box (only personal preference) will also give a few more horsies.

Post by **big red** » Wed Sep 03, 2003 10:22 pm

had extractors and 2 1/4" exhaust on my GQ, changed the exhaust to a
2 1/2" and it moved the power further up the rev band but lost a bit down low.
IMHO the 2 1/4" was better as the wagon cruised at 100 kph nicely before but after the 2 1/2" went on it cruised better at 110 kph so if i had to sit on 100kph i had to change back to 4th on every little hill.
shane

Post by **bogged** » Wed Sep 03, 2003 11:21 pm

I went a 2.5 and extractors before the turbo, it did Zero, apart from sound a little different.

Post by **bigbluemav** » Thu Sep 04, 2003 7:18 am

Thanks for all the advice guys.....much appreciated.

Area54......I've already got Finer Filters for both the air cleaner and the pre-cleaner. I've taken the pre-cleaner out all together as its less restrictive. Would there be any benfit to fitting a K&N instead of the Finer Filter in the pre-cleaner? Is it ok to leave the pre-cleaner empty, I clean the air cleaner every 5000k's, is this enough?

If I can get away with not rebuilding the pump, I'll be happy. But I have heard that the rebuild does change the engine noticeably for the better, but can I justify the $1600. If I don't need to I won't, I'll just run with the injector overhaul and other advice.

Thanks again all.

Post by **Area54** » Thu Sep 04, 2003 7:27 am

I think filters are a personal preference. I believe a K & N flows better than a finer filter, but a finer filter traps more rubbish. So you could run a K & N in the precleaner with not much reduction in air flow, with increased filtration to boot. In a diesel, you can never have enough filtration - cheap insurance and cheaper than a premature rebuild.

Post by **bogged** » Thu Sep 04, 2003 10:55 am

bigbluemav wrote: Is it ok to leave the pre-cleaner empty, I clean the air cleaner every 5000k's, is this enough?

I think your better off to get rid of the precleaner air box, if you have look at the outlet on the bottom, its VERY restrictive, the main hose is around 3in and the one on the bottom outlet is around 3x1inch oval.... cant be good

Post by **Robbo** » Thu Sep 04, 2003 11:21 am

GET SNORKEL see too many nackerd engines from guys who said I was gunna get one of them one day didn't think I would need one. :!:

Post by **Fathillbilly** » Fri Sep 05, 2003 7:12 pm

snorkel and piss off pre-cleaner

fuel it up a bit on the pump, injectors, good clean oil

extractors and a good exhuast

will all help it run better,

BUT get a SNORKEL, save your money and buy a turbo

Post by **bogged** » Sun Sep 07, 2003 12:57 am

Fathillbilly wrote:snorkel and piss off pre-cleaner

PIssed off my precleaner box today, just need to get a bracket made up, adn its finished.

Easy as shiat job, adn looks so much better with 3inch pipe from snorkel to airbox, instead of that shitty 3x1inch precleaner box

Post by **marko** » Sun Sep 07, 2003 5:52 pm

If your handy on the spaners grab a super charger of a toyota supra 2l for 250 bucks and bolt her on. Theres a bit of mucking around to fit but when its up and runing it double your horse power for around $700 fited.And you don't have to touch the exhaust if you don't want to

Post by **bogged** » Sun Sep 07, 2003 8:10 pm

marko wrote::) If your handy on the spaners grab a super charger of a toyota supra 2l for 250 bucks and bolt her on. Theres a bit of mucking around to fit but when its up and runing it double your horse power for around $700 fited.And you don't have to touch the exhaust if you don't want to

what sort of phucking around to get to fit?

Post by **Area54** » Sun Sep 07, 2003 8:43 pm

marko wrote::) If your handy on the spaners grab a super charger of a toyota supra 2l for 250 bucks and bolt her on. Theres a bit of mucking around to fit but when its up and runing it double your horse power for around $700 fited.And you don't have to touch the exhaust if you don't want to

Yes, a little more detail would be informative, as I think a lot people could benefit from good tech on this subject.

Post by **ozy1** » Sun Sep 07, 2003 8:45 pm

It would be good to fine some details on fitting the supercharger as i would prefer it over a turbo

Post by **bogged** » Sun Sep 07, 2003 9:07 pm

ozy1 wrote:It would be good to fine some details on fitting the supercharger as i would prefer it over a turbo

Could you run both a turbo and supercharger? :twisted:

Post by **ozy1** » Sun Sep 07, 2003 9:16 pm

I reakon you could if you "wanted" to, but youd have such a high pressure entering the engine it wouuldnt be good, and i spose you could send your engine on an erly retirement to the engine heaven too, but "id" prefer not too

Post by **bogged** » Tue Sep 09, 2003 10:53 pm

marko wrote::) If your handy on the spaners grab a super charger of a toyota supra 2l for 250 bucks and bolt her on. Theres a bit of mucking around to fit but when its up and runing it double your horse power for around $700 fited.And you don't have to touch the exhaust if you don't want to

So Bump, ANy more info on this??

Post by **ozy1** » Wed Sep 10, 2003 5:24 pm

Marko, please dude we need more info on this, whats involved? man, help us all, there may be a shortage of superchargers round soon.

Post by **bogged** » Wed Sep 10, 2003 5:31 pm

ozy1 wrote:Marko, please dude we need more info on this, whats involved? man, help us all, there may be a shortage of superchargers round soon.

Im thinkin its dribble...

Post by **bogged** » Mon Sep 15, 2003 11:17 pm

marko wrote::) If your handy on the spaners grab a super charger of a toyota supra 2l for 250 bucks and bolt her on. Theres a bit of mucking around to fit but when its up and runing it double your horse power for around $700 fited.And you don't have to touch the exhaust if you don't want to

bump.... for more info

Post by **-Mick-** » Tue Sep 16, 2003 1:31 pm

Bogged Wrote :

Could you run both a turbo and supercharger?

Mate there is too much by way of restriction of airflow and heat build up associated with doing this. Plus a whole lot of bootie fab which most here could probably handle but is a PITA

Either a turbo or supercharger properly set up will yield better results. One blower not enough run two of either (a PITA as well :roll:

) so lower boost in two than high in one = more go down low.

Imagine tellin the insurance company it's a supercharged turbo though :rofl:

Post by **GQ Toy** » Thu Sep 18, 2003 1:43 am

Bump again - sounds like what I am looking for

Post by **marko** » Sun Sep 21, 2003 3:59 pm

ok guys, so u want more info.First u have to move the steering pump. mine is a 95 model, so the vac pump is below the injector pump.that means I had to mount the steering pump up the top of the engine beside the themo housing and just in front of the intake manifold.Now as every body knows on pre '92' the vac pump is on the alt,this is beta because the steering pump can be mounted down below the injector on the timing cover. To do this u have to remove the oil reservoir and remote it,most nissan pumps are the same, so go down to your local wrecker and find same pump of a nissan sedan and remove the nipple of the pump and the remoted reservoir which is standard on that car, Sorry but i forgot which type of car is waz.Thats the hard part done.From where the steering pump use to be bolted is where the the lower mount of the blower is taken from. the top mount is bolted to the intake. To make the blower fit you
have to move the baterey over towards the outer guard. once the blower is fited fab a 2.5" pipe tha goes into the intake.Remove the crankshaft pulley for machining of a spacer and hat which the pulley boltes onto.2.8 ratio is good, Im running 140mm on the crank and 50 on the blower.The other you have to do is to turn the air cleaner around and towards the fire wal. Nearly forgot you need to space the fan out 25mm. Any more question give us a call on 0427951268 im based in perth

Post by **bigbluemav** » Mon Sep 22, 2003 8:29 am

Pictures, pictures.......I'm needing pictures!!! :crazyeyes:

Also, who did you get to tune this set up in? I'd assume that the inj. pump would need to be played with, as with turbo install.

Have you had it dyno'ed?

What is a "Toyota Supra 2l" in terms of capacity and year it came in. I'm not that familiar with jap import techno speak. I know it can't be a 2.4 litre diesel from a Hilux!!!!! :roll:

It sounds like a good option that's at least worth further investigation.

Post by **bigbluemav** » Tue Sep 23, 2003 5:22 am

Further to this, I spoke to a bloke at Alljap Spares in Virginia (Brisbane northside).

He said that they sell superchargers that originally came off Toyota Soarers, the earlier model with a straight 6 for $395.

I told him what I was looking at doing, fully expecting him to put me on the dickhead, and he said that he'd sold a few to blokes with Patrols (TD42). Somewhere in Brissie are people that have successfully done this. Where are they??

In relation to this, how do you verify how much boost this thing puts out at what revs so as not not to spit out a crankshaft? Do you need to (can you??) fit a waste gate. It would have to be overdriven, compared to original fitment due to the fact that you'd want it coming in earlier than the petrol engine, wouldn't it??

If anyone has any ideas, suggestions all greatly appreciated. Marko's second post was sometime later than his initial one, but I'm waiting patiently!!

Post by **Thor** » Tue Sep 23, 2003 1:38 pm

don't believe you can do wastegate and you wouldn't want to lose the boost anyway. they are just rice burner accessories.

edit: fixed spelling that might confuse

Post by **Fisher** » Tue Sep 23, 2003 8:36 pm

Turbos, Superchargers, Intercoolers ...! These 4.2's seem to have a real problem with being under powered. I'm glad I have a 3.0TDi

Post by **bigbluemav** » Wed Sep 24, 2003 7:33 am

Ta Thor

Had a bit of a think about it later........duuhhh!!!

Would it need some thing to relieve excess pressure or would it come drown getting the right ratio of the drives so the it comes on at approx. 1500rpm and gives max pressure at 2500rpm??

Post by **marko** » Wed Sep 24, 2003 10:45 pm

The computer wont let me send pictures. Tell me how?

No tuning required, just turn the pump up half a turn on the fuel delivery screw. On the dyno I achieved 90 horse power at the wheels (37" boggers) 1900 foot pounds of torque, which calculates to 170 horse power at the fly wheel at 2400rpm. 3 pound at idle and 8.5 pound at 2400rpm. Waist gate will not work on a blower because the idea of a waist gate is to let excess exhaust gases bypass the turbo, which stops it continuosly boosting and destroying itself.

The year of the Toyota Supra, I don't know. Just go to a wrecker and ask for a 2L supra blower.

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