Outer Limits 4x4 Board

Camshafts Does any body know if they is an advantage in grinding a standard cam to suit a after maket turbo engine. Keep in mind the engine is running between 20-25psi boost,electronically controled turbo
(no waste gate), ported head, fully balanced,Different rods and piston, injector pump 2.5 times larger.
I ned a cam is good from bottom to mid range rpm
Is there any differant's between a standard and factory turbo cam. Is there any one out there who has played with these cams and had success, or are they better of left alone.Any help would be great

The best people to ask will be the camgrinders like crow or wades. Cam lift can be a problem because of little clearance between piston and valve.

Has your vehicle been on a dyno. Tell us about the pump mods, am very interested in doing this to mine.

Cheers

the old saying if it aint broke dont fix it

Engine not yet finished, est horse power 200 to 250 at rear wheels. all i can say is the pump mods are't cheap.Get back to you when the engine is up and running

Can u go into some more details, ie who is doing the pump mods, what has been done to the engine etc.
Thanks

Does the factory turbo diesel have a diferant cam? What sort of power are people getting out of there factory turbo's?

Marko,
Have tried to find this info out myself recently......feedback is that, yes a modified cam will help to an extent....apparently one of the aftermarket turbo manufacturers used to sell these on with their kits?? But its a matter of talking to those who build race engines to find out the good oil.....unfortunately none would have touched a TD42 so you're a guinne pig, but still might help.

You shouldn't have any probs getting over 250 HP at he wheels with your set up. We're running std TD42 wit hybrid CT26 turbo, 18psi and larger fuel pump (delivers 100% more fuel at max torque than std set up) and get over 200HP at the wheels on 35's and std diff ratios. Give it a squirt of propane to really get things humming too :-)

Cheers
Mitch

Your not a guinea pig, we've done it already on 2 td42's.
I used camtech in sydney for the first which lifted the front wheels off the ground in my old shortie, it had some work done to it!
The other is in our race truck, which had heads port-polish, pistons machined off to run more boost, fuel pump mods were done by davesh at west end diesel, i dont know what he does, and he wont let us know but it is the shit! The cam lobes had the ramp down side of the lobes machined off for inlet valves to snap closed faster, the turbo was hiflowed and had different wheels fitted from new, with a hand cropped exhaust wheel for low down pickup. Heaps of other mods as well. And still to come!

GQ TROL wrote:Marko,
Have tried to find this info out myself recently......feedback is that, yes a modified cam will help to an extent....apparently one of the aftermarket turbo manufacturers used to sell these on with their kits?? But its a matter of talking to those who build race engines to find out the good oil.....unfortunately none would have touched a TD42 so you're a guinne pig, but still might help.

You shouldn't have any probs getting over 250 HP at he wheels with your set up. We're running std TD42 wit hybrid CT26 turbo, 18psi and larger fuel pump (delivers 100% more fuel at max torque than std set up) and get over 200HP at the wheels on 35's and std diff ratios. Give it a squirt of propane to really get things humming too :-)

Cheers
Mitch

What sort of fuel consumption?

shit that sounds good 2 me. I was thinking of machining piston aswell 2 run higher boost, but I wasn't sure if it would blow heaps of white smoke at ilde. How much did you machine of the piston crown and do you know what the compression was drop two. How much boost do you run. Any horse power figures? How much to mod cam shaft and fuel pump.Does the timing change alot with this pump set up. Im very interested in your race truck mods and any other tips you may have.

cheers
mark

MQHOON wrote:Your not a guinea pig, we've done it already on 2 td42's.
I used camtech in sydney for the first which lifted the front wheels off the ground in my old shortie, it had some work done to it!
The other is in our race truck, which had heads port-polish, pistons machined off to run more boost, fuel pump mods were done by davesh at west end diesel, i dont know what he does, and he wont let us know but it is the shit! The cam lobes had the ramp down side of the lobes machined off for inlet valves to snap closed faster, the turbo was hiflowed and had different wheels fitted from new, with a hand cropped exhaust wheel for low down pickup. Heaps of other mods as well. And still to come!

Shyt!!! how much power do you get from these motors? How much boost do you want to run?
Cheers, Kane.

mkpatrol wrote:What sort of fuel consumption?

the shorty or the comp truck? The comp truck is the 'christie creation', and sounds horn! fuel consumption is no issue with comp trucks..

Toyota 80 series pumps are adapted to Nissan pump for more fuel flow .

Bazzle

Can you tell us more abut the mods, Who does them and how much?

bazzle wrote:Toyota 80 series pumps are adapted to Nissan pump for more fuel flow .

Bazzle

Do you think it is possible to use this set up on RD28T engine Have heaps of mods including Powershot 2000 propaneinjection-kit, but stock injectionpump, it is modified though.

What sort of fuel consumption?

MQ Patrol,
I'm running the same fuel pump set up in my own daily driver. With a CT26 turbo with Garret T04-E 51mm trim compressor wheel (i.e. fricken huge compared to standard!!) I get around 9km/litre. Thats an average of highway driving (100km/hr +) and city driving. When you really start to peddal it up hills etc, you can watch the needle on the fuel gauge drop! My rig is slightly quicker than our race truck which has been set up for low down torque, mine is great on the highway, but there is no-one home under 2000rpm unfortunately.....thats mainly due to the large compressor wheel.

Cheers
Mitch

Thats not too bad considering I get 6 per hundred standard with about 3HP at the rear wheels

Thats not too bad considering I get 6 per hundred standard with about 3HP at the rear wheels

Its hard to get your head around the fact that even though the pump is delivering more fuel, you're actually using less. Its just because you're sitting at about 1/4 -1/3 throttle at 100km/hr instead of 1/2 throttle with the standard pump that the fuel consumption doesn't suffer.

I would certainly recommend doing the Toyota 80 series pump mod to your Nissan pump.....its just like turboing it again!!

Cheers
Mitch

GQ TROL wrote:
I would certainly recommend doing the Toyota 80 series pump mod to your Nissan pump.....its just like turboing it again!!

Cheers
Mitch

have you done that to yours?

have you done that to yours?

Mine uses a Komatsu aftermarket head on the standard Nissan pump....essentially it achieves the same thing as using an 80 series head The race truck uses the 80 series head (from 1HD-T)......they're pretty pricey by all accounts, but the guy we got it off didn't what it was worth .

Giving it the fuel is only half of the job though......you've got to let it breathe easier...we use a Donaldson truck aircleaner with about 8" diameter airfilter.

Cheers
Mitch

Mitch
Your truck sounds very impressive.Im doing the the same thing to my pump, but differant distibitor head. Plunger size is going from 10mm to 12m. Will pump two and times as much fuel.How much boost are you getting at full noise. Have you done any other mods to your engine to handle the power. what type intercooler are you useing.

mark

Marko,
12mm plunger is certainly the go!! Thats what the 80 series 1HD-T and my Komatsu pump uses. But total fuel delivery is dependant on the way its been set up also. Mine delivers about 107cc's of fuel per 1000 shots at max revs, while the race truck is over 120cc's per 1000 shots (standard TD42 is 57cc's!!), hence why its got more torque than mine....and why it regularly breaks injector springs.

Aneroids has been modified to have two different settings. So with the twist of a 3mm allen key, it delivers max fuel off idle instead of slowly metering it in based on boost. Lotsa black smoke from the diesel, and lotsa white smoke from the tyres.

The guy I co-drive for worked at a fuel shop in Oz for a while and spent his time building these types of pumps, hence why we now run them too.

Mine only runs 12psi, while race truck is 16psi for road work and around 20psi when racing. No intercoolers or any other performance mods on either trucks...but going to propane fumigation on the race truck once we can find an appropriate mixer for it.

Have found a guy in Auckland (NZ) that will do a TD42T cam grind on your standard TD42 cam for NZ$120 plus GST. Is called Franklin Cams, can provide their details if you'd like them....unfortunately, they haven't built a really "go hard" one yet though.

Cheers
Mitch

Mitch
Only 12psi, thats not much.20 psi sounds more like it.How high are air temps getting on both trucks. I was going to run around 20 psi with a water to air intercooler. With the garrett turbo Im useing, it should boost from 1000rpm and not compromise top end power. The turbo is designed to run 35psi all day on the right application, But i wouldnt run that much. Do you decompress your engine, How much should be machined of piston. Is your race truck useing a 12mm plunger as well,with the max fuel screw adjusted to get that huge fuel deliverey. Does the pump timing change completly.Do you alter the injector crack of pressures.Is your race truck td42 bottom end been beef up.Are you able to tell me power figures for both trucks.Did you use these guys in NZ to grind your cam shaft. If you could a phone number be geat.
I know Im picking your brain alot, but its sounds like you are getting good power and you know what your doing.Im in the process of doing it to mine.So I need all the information I can get Before I spend the BIG bucks

Thanks
mark

Marko,
Yeah 12psi is bugger all, but my truck is just a daily driver, so wanted the reliablity from it. Not so concerned about that from the race truck (although its still my mates daily driver too!) though.

A bit of background info for ya.....we have no budget to speak of and no sponsorship, so we're only after big power gains at the lowest price. Thats why we're looking at propane inject. My driver is a diesel and turbo mechanic so rebuilding an engine is not a biggy for us. Infact its probably cheaper than building a water to air I/C (which by the way work well!). We're looking to build a new race truck as the old one is getting tired, but if we sell it now its still worth something.

We've struggled to get big torque from way down low, so may go to a Garrett T02/T04 hybrid in order to find it. We don't have alot of high speed stages in competitions...might get to 110km/hr, then its on the brakes again so lotsa top end isn't important as it is for you guys.

Haven't decompressed the engine or machined pistons, but maybe fitting the thickest head gasket possible would achieve the same thing?? Is a cheap and nasty alternative, so thats prob what we'll do :-)

Race truck uses the 12mm plunger (as does mine), but its fuel delivery is modified internally...i.e. not the fuel screw on the back of the pump. It black smokes less than mine...just a sooty haze really. Injectors break at about 140-150 ats....which doesn't help the spring breakages!!! Have done nothing else to either engines.....they are bog standard TD42 non-turbo engines(89 and 92 build). I hydraulicked mine a year ago (bent a rod) and we rebuilt it using TD27 rod and piston.....they are the same as TD42, only cheaper. Yep, we are cheap and nasty!!!

Race truck dynoed at over 200HP at the wheels on 35's and standard diff ratios (4.1's). Haven't dynoed mine but it will be somewhere around there too. Not too concerned about it.....it makes 80 series Landcruisers and V8 Range Rovers look stupid, thats enough for me :-)

Have only been told about the cam grinders in Auckland, haven't contacted them ourselves yet. Franklin Cam Services Ltd. Ph + 64 9 238 4067. Email for them is cam@ps.gen.nz

If you dont mind me asking, how much are you paying for the fuel pump work??

Cheers
Mitch

Give Ivan at http://tighecams.com.au on 07-3209-3704 for your cam shaft mine cost $150. Works a treat about 5% increase from standard cam.

Also if you what a GQ-GU Pump Modified give Denco Diesel & Turbo, Wagga Wagga, 02 6925 4348. Mine cost around $1450 and gives 105% more fuel at 100% trottle and 37% at 6 Deg, they will do a larger Mod that will Deliver app 130% but a lot more work and bigger $$$$$$.

Give Ivan at http://tighecams.com.au on 07-3209-3704 for your cam shaft mine cost $150. Works a treat about 5% increase from standard cam.

Thanks GutSquisher, did you just get a replacement turboed TD42 cam, or did he build you one to your specifications??

Cheers
Mitch

Mitch
Thanks for all that great info. It's good to know that the old td42 can take all that grunt. As Im a diesel mechanic myself and can sorce the parts i need through my work at very cheap prices. I went to a fuel pump shop and they wanted close to a grand just for the plunger and distribitor head. That was the only place I went to, so Im not sure if that's cheap or not. That was a 12mm plunger of a 200hp volvo. I do the work on the pump myself and the put it on a mates test bench to set it up. Im in perth,so as far as I know body here play's with them. And the over east price is $2700 for a comp pump. I thought bugger that, I will do it my self.
If you do'nt mind me asking what does it cost you to get the mods done
What sort of air cleaner do you use

Thanks
Mark

Marko,
I certainly looks like the TD42 can take the punishment!! A guy in Wellington is getting 322HP at the rear wheels with similar pump work, intercooler and propane injection. He used to run over 20psi of boost, but after propane injecting it, he got the same HP with only 16psi.

Depending on how much power you want, I can't see a problem in using a 13mm or even 14mm plunger to give it more fuel if you want. Its still working on the same principals, but somehwere along the way you're gonna start melting things!! We've found a 13mm one from a Mitsi truck pump, just need to spend some time playing around with it. That Volvo plunger sounds good, I wouldn't have a clue about price though sorry.

When my mate was working in a fuel shop in Oz 2 yrs ago, they were charging over AU$2500 for the upgrade...he is doing them for other people here for NZ$1500-$2000 and still making enough for his pocket. I paid cost ($350) for my new head (Komatsu)....and he built it up for nothing . Was because I was crewing for another mate competing in the NZ winch challenge back in November and wanted more power so I could carry all his shite for him.

I use the aircleaner from a TD42-T GU, it sits behind the left-hand headlight. Its too small though and is restrictive.....race truck uses Donaldson aircleaner about 8" diameter and 12" long and still seems marginal! Not sure what the solution is....prob just have to put up with it. Go twin snorkel if you can, or atleast 4" single snorkel. The yellow GU ute that was in 2004 OBC had a huge Donaldson type aircleaner mounted on the deck with intake just above the roof of the cab....that might be worth trying??

Cheers
Mitch

He will regrind your cam to the specs he uses for the off-road racers.

But would grind to what specs you wanted, if you had a particular profile in mind.

GQ TROL wrote:I use the aircleaner from a TD42-T GU, it sits behind the left-hand headlight. Its too small though and is restrictive.....race truck uses Donaldson aircleaner about 8" diameter and 12" long and still seems marginal
Cheers
Mitch

I have an 04 GU wagon and just curious how much better it is to run one of these donaldson pre-cleaners under the engine bay are they worth it....

give much power or barely noticeable.

cheers