Outer Limits 4x4 Board

i have a 2h currently running a T04e turbo and it does not start making boost until 2500rpm = no good! what else will fit the manifold i have, which has a T04 flange?

You could try using a equal length runner custom manifold and give the head a port and polish that should get it moving a little earlier and come on nice and strong.

I like big turbos in a way they come on later and harder and for the rest of the time they aren't on boost using more fuel / heating everything up / stressing the motor. I had a T04 size turbo on a 2H it was great. 5th gear on the highway it wasn't on boost and the car ran great change to 4th and accelerate and it would pull away hard, accelerate up hills etc.

Now I have an off the shelf kit fitted by a turbo guy on a different 2H, Turbo is smaller full boost by about 1500rpm pulls sooner but on the highway its always on boost a little and doesn't have the same kick as the bigger one

Sorry but I totally disagree! Not much point having a turbo diesel if the turbo's not doing anything most of the time and doesn't even work in the engine peak torque range!

chunks wrote:Sorry but I totally disagree! Not much point having a turbo diesel if the turbo's not doing anything most of the time and doesn't even work in the engine peak torque range!

this.

my 100serires(1HDFTE) pulls like a train from 1500 through to 3500 and I wouldn't have it any other way!

I've had both on 2H's I like bigger for the reasons outlined. Comes on harder, later, engine isn't boosting all the time, heat is less, uses less fuel, power is where a diesel lacks power.

But I accept I am not the norm which is what my current, shop fitted package, is a lot smaller.

Forgot to say I agree 2500rpm is too high, an equal length runner steam pipe manifold will flow a lot better than the standard 2h manifold which means boost earlier. Plus a port and polish of the head would get that T04e coming on nice and strong at around the 1700-2000rpm mark.

My shop fitted kit boosts at 1000rpm is on full boost around 1400rpm then dies of at 3200rp-3400rpm mark.

SCANAS wrote:Forgot to say I agree 2500rpm is too high, an equal length runner steam pipe manifold will flow a lot better than the standard 2h manifold which means boost earlier. Plus a port and polish of the head would get that T04e coming on nice and strong at around the 1700-2000rpm mark.

My shop fitted kit boosts at 1000rpm is on full boost around 1400rpm then dies of at 3200rp-3400rpm mark.

a diesel on boost uses less fuel for the same amount of power? unless its not fueled correctly?

also, the standard toyota manifold is just a cast log manifold and I don't think there would be any benefit "upgrading" to a steam pipe log manifold. If you were going to do an equal length manifold you cant do a log manifold, as its not possible to do equal length then? Middle exhausts ports will always be shorter to the turbo?

A diesel on boost will use more fuel than not on boost.

More fuel = More heat = more stress on the motor

An equal length runner manifold will dramatically increase the performance of the turbo over the standard 2H manifold.

This is a skyline manifold but its not hard to see that benefits.

http://www.gtrpwr.com/showthread.php?t=871" onclick="window.open(this.href);return false;

Actually boost=more air which=leaner mixture and in turn = lower EGTs.

SCANAS wrote:A diesel on boost will use more fuel than not on boost.

More fuel = More heat = more stress on the motor

An equal length runner manifold will dramatically increase the performance of the turbo over the standard 2H manifold.

This is a skyline manifold but its not hard to see that benefits.

http://www.gtrpwr.com/showthread.php?t=871" onclick="window.open(this.href);return false;

a diesel on boost will use more fuel why? if it has a boost compensator yes, does your 2H???

More air(boost) means a leaner burn(fixed fuel delivery/RPM on a 2H) and less heat for the same power output.


You said an equal length runner log manifold. not possible to have a log manifold with equal length runners. That skyline manifold is great on a high performance engine, but a serious waste of money and effort on a 35 year old 4litre diesel.

a diesel on boost will use more fuel why? if it has a boost compensator yes, does your 2H???

Already answered that. No my 2H does not run a boost compensator

More air(boost) means a leaner burn(fixed fuel delivery/RPM on a 2H) and less heat for the same power output.

By turboing a 2H you will have higher under bonent temps, higher inlet temps and higher egts.

You said an equal length runner log manifold. not possible to have a log manifold with equal length runners. That skyline manifold is great on a high performance engine, but a serious waste of money and effort on a 35 year old 4litre diesel.

It is possible to have a log manifold with equal length runners. They're just not OME. Waste of money, well that depends on the individual. A way to increase the efficiency of the turbo and lower inlet and exhuast gas temps yes.

Thus completing my longest ever post on outers time

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Actually boost=more air which=leaner mixture and in turn = lower EGTs.

Assuming the systems efficency is broad enough. But we are talking 2H's on standard cast manifold here...

a 2860 would be a prime choice for that engine.
Considering the long stroke and inline pump, those engines dont lend them selves to being reved freely.
So the earlier you can make maximum torque, the nicer the car will be to drive.

You dont have to go silly on fueling or boost to transform the car from what you have now, to something much more pleasurable to drive.

They used to use very large turbo's on diesel engines, which meant no wastegate was required as at maximum revs the turbocharger would only just be hitting 10-12psi of boost.

Take a step forward 20 years and with the current technology available, you can be hitting full boost around 1500-1600rpm and hold that out to 3500rpm.
The best thing is, you wont have any need to rev the crap out of it anymore as it will be making more torque at 1500, than it used to at 2500rpm +