Boost and EGT at cruise speed - TD42 turbo

Joined: 11 Jan 2004 Location: here and there

Curious to know what other people with TD42 turbos figures are like at cruising speed - say 100-110 on level ground.

I know theres a lot of variables but it would be good to see the range of figures.

Mine is making 2-3 pounds at cruise and the egt post turbo is about 250- 280. EGT goes up to about 300 when towing a small tinny, about 400 towing a car trailer and makes about 8 pounds pulling this at 100. Any sort of incline and these figures are lot higher.

I have 31" tyres so these figures are at about 2300 rpm.

Joined: 16 Nov 2005 Location: Brisbane

at 110km making 5-7 psi running 400-450C pre turbo pushing 35" simex. Towing seem to make little to no difference.
I'm assuming your temps are after the turbo?

Joined: 18 Sep 2006 Location: Albury

At around 100-110kph my boost is about 8 pound. The EGT is sitting around 320-370C.

I actually backed the fuel screw off on mine the other day, because the EGT's would jump up quickly when I got to a hill and I would continually have to back off the accelerator or change it down a cog. Just 1/8 of a turn has made a considerable difference. I have lost a little bit of power during take offs but can get up the hills on the highway quicker because I'm not backing off as much.

Joined: 30 May 2006 Location: Kerang vic

Mine sits on 250deg at 100kph, 6pound boost. Its measured from the dump pipe and im running 35's with standard gearing.

Cheers Den

Joined: 12 Apr 2005 Location: sunny coast qld

got a gu ute with 140rwhp on 315 claws, 15 psi boost.

get around 300 degrees post turbo and 8-10 psi boost at 100 odd kmh.

i think it depends on how much power/boost/tyres/vehicle running

cheers

PAUL

Joined: 11 Jan 2004 Location: here and there

Is it bad for a turbo to be making 8-10 lbs of boost on a continuous basis?

I try to keep mine between 2-5 when cruisng and back off when it spikes to 11 after flooring it , maybe I'm being a nancy boy....

Anyone know what a semi trailer would be doing on level cruise, no headwind etc?

Joined: 02 Aug 2008 Location: here

FRGTR

Joined: 20 Jan 2008 Location: swan valley

Where are you measuring from? Pre or post turbo.

Joined: 11 Jan 2004 Location: here and there

I'm using the same digital one which is the topic of the current group buy thread. Its incredibly sensitive - the slightest change in pedal position and it will change instantly. They are a great gauge, unfortunately my first one only lasted about 2 months....

My measurements are about 2" post turbo in the center of the dump.

Joined: 02 Aug 2008 Location: here

egt should be measured before the turbo

Joined: 09 Nov 2004 Location: Lilydale

4x4 guy,
I think your comments are a little bit too general. Yes we see lower temps than what we log on the dyno, but not 150c. At 600c thats a 25% inacurracy, I don't think vdo would stand for that.

Care to tell more??

Yes all temps should be done pre turbo, but in real life its not always the easiest thing to do.

Andy

Joined: 26 Sep 2004 Location: Rochedale South - Brisbane

vanbox wrote:

got a gu ute with 140rwhp on 315 claws, 15 psi boost.

get around 300 degrees post turbo and 8-10 psi boost at 100 odd kmh.

i think it depends on how much power/boost/tyres/vehicle running

cheers

PAUL

I'm nearly exactly the same 130rwkw, 315's on 3.9's, 14psi boost

get about 280C cruising post turbo in dump at about 6-8psi