Outer Limits 4x4 Board

i wanted your opnion for diesel engine,

i value your opnion

Regards

McJeff

TD42T the bigger the better

okay, i have driven a couple of diesels off road, i have driven the SD33, RD28t, and the TD42, SD33 isnt bad offroad, slightly underpowered, but very capable, the RD28t is okay offroad as long as you got some reduction gears fitted in the gear box as the turbo comes in about 1800rpm, and without boost it wont drive in the rough stuff,
TD24, i have one of these and it has served its purpose well, drives well, crawls well even with standard ratioshas a pit of power, mind you, a turbo on this would make it even better especially when large bursts of power are required to clean out the tread

Supercharged TD42 on the list pls.

That is what i would choose for offroading.

Reason??

Imaging yourself idling climbing a steep rock step. Last thing you want is the turbo boost to come in when u do not want it to. Eg boost comes on and you slide sideways - which is why some offroaders keep their turbos on boost when they're climbing. Problem is havin it on boost can result in the offroad vehicle goin a little too fast uphill or downhill. It also can suprise a lot of people when they're revvin em to 1500 ish to climb and it doesnt take a lot to get it to the stage where boost comes in and you could end up sideways - into a tree or in a position that you wouldnt want to be in.

Having a supercharged TD42 = you're talkin about boost from idle - no suprises and heaps of grunt. - thou its an area that isnt common. Im still researching that part - eg which supercharger and who does it etc.

RD28T is a slug - always will be. They're a weapon offroad with crawler gearing as they can stay on boost and there isnt too much suprises with that one due to power in those cars being really crap. - sad thing bout the rd28t is.. you whack on some huge tyres on it.. eg 35's.. and run crawler gearing. You then have the dilemma of driving home with those 35's on 2wd high range and you'll find that most hills you come to will reduce the vehicles speed to approx 40 kph / 2nd or worse 1st gear which really sucks.


TD42 is the best compromise due to its ability to crawl on low range without much dramas. They're a bloody reliable engine which i've seen quite a few go in excess of 500 thousand kays and still goin strong.

ZD30 - if you do a search on the forums - and have a look on how bad those 3 litre turbo diesel patrols are - blowing up, turbo's dying, and nissan denyin they have a problem with them in Australia, they're a good machine, more power than a TD42T - but reliablity sucks. Sufficient to say that the RD28T outlasts the ZD30 thru reliablity and economy. Oh did i mention there are a few problems with the gearboxes behind the ZD30's as well.

In my opinion, All the engines you have listed are all great, servicibility, and responisibliity can make those engines last in whatever situation you're in - offroading or on road, but purely my opinion lies with the supercharged TD42.

My 2c

TOM

GQ wrote:Supercharged TD42 on the list pls.

Having a supercharged TD42 = you're talkin about boost from idle - no suprises and heaps of grunt. - thou its an area that isnt common. Im still researching that part - eg which supercharger and who does it etc.

TOM

if you find any details on this, coupl you plz post up for all to know, as i have been thinking along the same lines
Shawn

ozy1 wrote:

GQ wrote:Supercharged TD42 on the list pls.

Having a supercharged TD42 = you're talkin about boost from idle - no suprises and heaps of grunt. - thou its an area that isnt common. Im still researching that part - eg which supercharger and who does it etc.

TOM

if you find any details on this, coupl you plz post up for all to know, as i have been thinking along the same lines
Shawn

Have you guys read this?
http://www.airpowersystems.com.au/safari/turbo/turbo_super/air_force1.htm

look at the tables on page five comparing boost and intake temps.

The bad rap for turbo's coming on hard and late is not true for most modern kits that I've had anything to do with.

Im running a turboglide setup that uses a plain bearing gt28 garrett, and its making boost from ~1000 rpm and the engine has no sudden power surges, comes on smooth and strong. Economy's great, powers enough, price was right and the setup is simple and reliable with plenty of scope for increasing power.


Sprintex kit looks like the charger might be a bit small = not enough boost and high intake temps.

Cheers
Daryl

derangedrover wrote:look at the tables on page five comparing boost and intake temps.

The bad rap for turbo's coming on hard and late is not true for most modern kits that I've had anything to do with.

Im running a turboglide setup that uses a plain bearing gt28 garrett, and its making boost from ~1000 rpm and the engine has no sudden power surges, comes on smooth and strong. Economy's great, powers enough, price was right and the setup is simple and reliable with plenty of scope for increasing power.


Sprintex kit looks like the charger might be a bit small = not enough boost and high intake temps.

Cheers
Daryl

Good comparisons on that graph. BUT i point out one thing.

Safari turbochargers have been around for a while now and the superchargers have just only become avaiable for GQ diesels. Is it possible that the market will soon expand and warrant further R & D on the supercharger systems. Eg running different superchargers such as the Eaton M90 or other supercharger systems as just like turbos = they are not all the same?

TOM

I picked TD42T

After reading some mags, forums, etc... i've been told this engine is old and thristy, but it could do with some power-ups like Motson's or Safari along with 3 inch exhaust...

i wonder if Safari Dtronic will match with this engine seeing this isn't direct injection efi like ZD30

can i do EFI conversion on TD42T using ZD30 parts?

Regards

McJeff

Depends what exactly you are doing.

The 3 and 2.8ltrs i would scrap for a reason because if you do a little reasearch you can find that the 3ltrs have "balls" but seem to have a mid life crisis which generally needs at least a topend rebuild around the 100k mark and the 2.8 is just slower than a camry with a box of kleenex on the back parcel tray.

The 4.2 may be slow but proven. However in its latest form with the factory turbo and intercooler goes relatively hard, it was one of the new ute's that i had a spin in and with the intercooler quite possible that more psi could be gained without loosing too much engine life. Also economy goes out the window obviously when driven hard, but it certainly does feel quite close to the 4.8!

"Old and faithful SD33", don't we have some memories... Good for low range stuff but slow as it was originally designed as a forklift engine (also explains the stupid breather that pours your oil on anything over 30deg. ). Haven't driven the factory turbo but depending on where it kicks in I would give it the big thumbs up... come to think of it it if it come on anywhere in the rev range it would be a blessing!

My 2c

heh tom? I've had a turbo diesel and driven a few td42t's well and i have no idea what you are talking about ie sudden boost that sends you sideways........ . Redoing my engine to take a safari tubro & intercool it. with a mates that has 170hp the rear wheels and a 1000 ft/lb of torque we have never had this problem, however i am interested to hear more about your experience with it.

Cheers

Red Rover wrote:heh tom? I've had a turbo diesel and driven a few td42t's well and i have no idea what you are talking about ie sudden boost that sends you sideways........ . Redoing my engine to take a safari tubro & intercool it. with a mates that has 170hp the rear wheels and a 1000 ft/lb of torque we have never had this problem, however i am interested to hear more about your experience with it.

Cheers

You are probalby right there mate. Had a good think just then about the turboed vehicles ive been in. And i came to the conclusion that funny that.... Only been in heaps of turbo petrol cars - vl turbos etc. with massive turbo lag, and pretty much thought the same principle applied.

TOM

welcome to the world of soot & oil

In Regards to GQ's curiosity with other makes and models of SUPERCHARGERS, I agree it would be very interesting to get 'CAPA' to try some testing with this TD42 engine because although we all know turboes are great for big horsepower, TOP FUELERS don't use blowers for looks thats for sure, and their are some awsome supercharged street cars lurking around the streets with big power increases that have only appeared after the re-introduction of under bonnet blowers and they still idle and sit in traffic quite well..

Rod McCloud (80scool forum), supercharged his 1HZ and kept busting harmonic balances- power was good, just obviously not enough research done into possible problems. In the end he took it off and ran it natural again so my advice would be before going supercharger in the TD42 do your homework and see if anyone else can give real experience... but then again it may go trumps . Who knows, but if it was up to me; tried and tested - TURBO!

MQ080 wrote:Rod McCloud (80scool forum), supercharged his 1HZ and kept busting harmonic balances- power was good, just obviously not enough research done into possible problems. In the end he took it off and ran it natural again so my advice would be before going supercharger in the TD42 do your homework and see if anyone else can give real experience... but then again it may go trumps . Who knows, but if it was up to me; tried and tested - TURBO!

dude on exploroz has a s/charged TD42 loves it, then again havent heard from him in a while, could have blown it up...

but well worth checkin out

bogged wrote:

MQ080 wrote:Rod McCloud (80scool forum), supercharged his 1HZ and kept busting harmonic balances- power was good, just obviously not enough research done into possible problems. In the end he took it off and ran it natural again so my advice would be before going supercharger in the TD42 do your homework and see if anyone else can give real experience... but then again it may go trumps . Who knows, but if it was up to me; tried and tested - TURBO!

dude on exploroz has a s/charged TD42 loves it, then again havent heard from him in a while, could have blown it up...

but well worth checkin out

LINK HERE

http://www.exploroz.com/Forum/Archive/2004_1/9694.asp

Was lookin up that ages ago.

TOM

muddyperils wrote:In Regards to GQ's curiosity with other makes and models of SUPERCHARGERS, I agree it would be very interesting to get 'CAPA' to try some testing with this TD42 engine because although we all know turboes are great for big horsepower, TOP FUELERS don't use blowers for looks thats for sure, and their are some awsome supercharged street cars lurking around the streets with big power increases that have only appeared after the re-introduction of under bonnet blowers and they still idle and sit in traffic quite well..

turbochargers are not an option in TOP FUEL rules, not that that has anything to do with choosing forced induction for a diesel 4wd.

idle quality has nothing to do with the chosen means of forced induction

there are plenty of big power turbo street cars lurking too, just have a look at horespower heroes @ summernats, see many blowers? again, not that that has anything to do with diesel 4wd's.

CAPA's charger is centifugal isn't it? Less efficient again than a good screw type charger at low RPM and probably worse for low RPM boost.

Cheers
Daryl

Guys,

I see you don't like the RD28T....hmmmmm....here I come:

My comp rig IS a RD28T, with:
- turbo set for 0.8 bars
- big core intercooler, fan ventilated.
- 5.1 ring and pinion
- Simex 35/10.5/16

My daily car is a TD42, with:
- 4.6 gears
- 35/12.5/15 Coopers

I can tell you that in the comps the engine is not bad at all, compared with the TD42, the TD42 of course has more torque at idle, but the RD28T really is not bad!!! And on the streets (even you will think I'm crazy....), the acceleration is better on the RD28T then the other one, due to the turbo!! Up-hill on the street I can go veeeery easy in the 5th gear. (probably because of the intercooler...)..with the TD42, I have hills that I climb in the 4th gear....

If I could, of course I would like the ideea to have in the comp rig the TD42T, but honestelly, between the TD42 and the modified RD28T, I still choose the RD28T....

Best regards, Gabriel