Outer Limits 4x4 Board

Theres a lot of talk about the xr6 turbos and there suitablitely on TD42 engines,has anyone actually fitted one to the TD?what sort of results did you get?

Shane

Think about the....

So you've got a td42 which you want to power to kick in about 1600-1800rpm yet a turbo designed for a petrol??? Don't think it would work so well

I was given that option only a month ago when i needed my turbo replaced & thought nah thats just stupid!

Mine is an AXT turbo which is a modified garret, yeah its not the biggest of turbos but is designed for that motor & works really well i have found.

Cheers

Andrew

Big Red Toy wrote:Think about the....

So you've got a td42 which you want to power to kick in about 1600-1800rpm yet a turbo designed for a petrol??? Don't think it would work so well

I was given that option only a month ago when i needed my turbo replaced & thought nah thats just stupid!

Mine is an AXT turbo which is a modified garret, yeah its not the biggest of turbos but is designed for that motor & works really well i have found.

Cheers

Andrew

X2

Clarkie wrote:Theres a lot of talk about the xr6 turbos and there suitablitely on TD42 engines,has anyone actually fitted one to the TD?what sort of results did you get?

Shane

its a pretty big turbo. It would spool up pretty late which is not want you would want

depends where u want your power band

the T04 off an XR6t will give u a big top end power
specially if u can make ur diesel rev ie: full balance and blue print of the engine

would be sweet on the sand runs and fast events

thanks for your imput guys,still like to here if ones been fitted and how it goes?

It well more than likley spool up fast on the diesel which has a higher exhast pressure,easyest way is here from someone who has fitted one.

Shane

yup deisels will push more exhaust gas - the turbo is well suited

A mate has one on his GQ running standard engine, pump and injectors but fuel turned up to suit 20psi also no IC.

Goes very good but probably not the average guy going away for weekend but more for a comp truck. Needs a few more revs than say a standard aftermarket turbo setup.

Sounds way to big for anything but ultimate top end. At what revs does it produce any power? About as big as I've heard anyone putting on is a GT35 and an XR uses a GT40 (late model) so quite a difference. A GT40 will only give topend on my 4.5 V8 petrol and that revs to over 7000rpm. How is a deisel going to deal with that?
But I'm no expert, I'm just going through sizing a turbo for my truck.

petrol 11to 1
diesel 22 to 1
double the exhaust gas

jav wrote:petrol 11to 1
diesel 22 to 1
double the exhaust gas

This is what I thought, but its wrong

doesn't work like that, they DON'T spool a petrol turbo up as quick, trust me i learn't when i put 2 turbo's of ZD30's on a 5l, when i changed the waste gate to 6 psi units it would reach 8 at 5grand, with the wastegates wired open it would see 3 psi at 5grand, all because a petrol flows more air

I would have said the turbo on the XR6-T is all about low end grunt. It is running full pressure by 2000 rpm which by petrol motor standards is very low. It is a relatively small turbo for a biggish motor.

A normally aspirated diesel and petrol of the same size will pump the same amount of air at same RPM.

NJ

the turbo wont spool up early if anything will be in the rev range of 2000 + rpm.

Even for comp work you wouldnt choose this turbo, as once you have higher level of fuel and then rev the motor more you start snap injector springs.

But by all means choose this turbo, i reckon its a waste of time They also have a T3 flange and not a T25

For the same engine size, diesels require a smaller turbo to come on boost at the same time. The TD42 and TB42 engines are both 2 valve pushrod engines and have approximately the same volumetric efficiency. That means they induce approx the same flowrate of air into the inlet manifold. The difference is the EGT on a diesel is 500 -600 deg C or lower, wheras a petrol is 850-950+ deg C. That means the internal energy (pressure and temp) in the exhaust manifold is more on a petrol which gives more energy to spin a turbine up earlier.

The cooler the EGT the less energy available.

XR6 TURBO Petrol

raptorthumper wrote:For the same engine size, diesels require a smaller turbo to come on boost at the same time. The TD42 and TB42 engines are both 2 valve pushrod engines and have approximately the same volumetric efficiency. That means they induce approx the same flowrate of air into the inlet manifold. The difference is the EGT on a diesel is 500 -600 deg C or lower, wheras a petrol is 850-950+ deg C. That means the internal energy (pressure and temp) in the exhaust manifold is more on a petrol which gives more energy to spin a turbine up earlier.

The cooler the EGT the less energy available.

Someone clever

I know this thread is a little old, but has anyone got any first hand experience with and xr6 turbo on a TD as i am thinking about having a crack at using one???

Just some more FYI for people looking at this (re: petrol/diesel turbos).

I run a turbo off a 3.0L petrol engine on my TD42. Starts making boost at 1200RPM, full boost at 1800RPM (only at 6psi at the moment) and pulls through to 3000RPM. Suits my driving style perfectly, and should go well when i get around to adding more boost/fuel.

raptorthumper wrote:For the same engine size, diesels require a smaller turbo to come on boost at the same time. The TD42 and TB42 engines are both 2 valve pushrod engines and have approximately the same volumetric efficiency. That means they induce approx the same flowrate of air into the inlet manifold. The difference is the EGT on a diesel is 500 -600 deg C or lower, wheras a petrol is 850-950+ deg C. That means the internal energy (pressure and temp) in the exhaust manifold is more on a petrol which gives more energy to spin a turbine up earlier.

The cooler the EGT the less energy available.

so why is it that petrols can go to a higher egt then a diesel with out puting holes in pistons????

AFAIK deisels are a more efficient engine, 32% efficiency compared to 26% of a petrol. Deisel also retains most of its combustion heat in the cylinder and petrol blows most of it out the exhaust.

I'm proberly not 100% correct but it should be rough enough, I'm sure someone will correct me.

if the turbine housing was changed over 4 a 0.63 or 0.82 it would spool up quicker. i think an ford turbo 6 has at least an 1.0# sumthing rear A/R way too big unless u want a dyno pony and useless for on the road.

I don't understand why people try to give advice to others when they don't have a clue about what there talking about?

An xr6 turbo is a Garrett GT35R or GT3582R it has an internally waste gated 1.06 turbine housing and a .5 compressor cover. it has a single scroll T3 exhaust flange.

I have never put one on a td42, but i have put a GT3071R on a 1HZ diesel and it was fairly laggy. A 3071 is alot smaller than a GT35 so my guess is it would be vary laggy on a td42. Most td42's work well with 2.0-3.0L petrol turbo's . You will need a heavily modded td42 to spool up a GT35 and even then it still might not be what you want.

p.s. Be vary careful who you listen too as you could end up making a very expensive mistake.

A GT35 will be far to large on a TD42 unless it has alot of work done. For a daily driver there are some much better options, that would also be cheaper and more compact.

drifter** * wrote:I don't understand why people try to give advice to others when they don't have a clue about what there talking about?

An xr6 turbo is a Garrett GT35R or GT3582R it has an internally waste gated 1.06 turbine housing and a .5 compressor cover. it has a single scroll T3 exhaust flange.

I have never put one on a td42, but i have put a GT3071R on a 1HZ diesel and it was fairly laggy. A 3071 is alot smaller than a GT35 so my guess is it would be vary laggy on a td42. Most td42's work well with 2.0-3.0L petrol turbo's . You will need a heavily modded td42 to spool up a GT35 and even then it still might not be what you want.

p.s. Be vary careful who you listen too as you could end up making a very expensive mistake.

X 2 do your own research from reliable sources.....and yes that turbo is too big for even a worked TD42T , check the Garrett web site calculations if you are not sure its all there.

http://www.turbobygarrett.com/turbobyga ... ation.html

regards garth

it is a big fcuk off turbo if anything to be put onto a custom 4.5 or 4.8 petrol setup. call JPC or dzltec and all your q's will be answered.

Thanks for your input guys, will can that idea and grab a gt2871 I thinks.

Wish I had coils wrote: so why is it that petrols can go to a higher egt then a diesel with out puting holes in pistons????

in a petrol motor petrol is put in well before it burns and evaporates cooling the pistons/head.
in a diesel the fuel burns almost immediately when its injected so the diesel fuel doesn't get a chance to cool anything.

the pressure that the fuel is injected into the engine is far great in diasels causing holes to be blown in the top of the piston. but this is not the only way hole can be blown in the top of the piston