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Boost and EGT at cruise speed - TD42 turbo

Tech Talk for Nissan owners.

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Posts: 569
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Boost and EGT at cruise speed - TD42 turbo

Post by Mark2 »

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.
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Post by broken80 »

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?
89 GQ LWB TD42 TO4E Higmount Turbo & FMI 4" coils 36" TSL Swampers
69 FJ40 V8 37's some custom stuff
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Post by philhod »

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.
GU ST 4.2 TURBO. 9000lb Warn, Snorkel, 4" Lift, 33" BFG Muddys, ARB Locker, Outback Drawers, Dual Batteries, ARB Roof Rack, IPF HID's, GME UHF, 60lt Engel, Full 3" Exhaust and fuel pump tweaked
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Post by Den81 »

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

Cheers Den
89 st wagon, 4.2 turbo, top mount intercooler, 3'' zaust, factory locker, 2'' bodylift, 4''lift, superior drop box's, 35'' mtz, custom bullbar, premier winch
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Post by vanbox »

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
MUD BEERS and MAYHEM

DURAMAX POWERED GU
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Post by Mark2 »

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?
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Post by 4x4 guy »

FRGTR
Last edited by 4x4 guy on Mon Sep 15, 2008 8:47 pm, edited 1 time in total.
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Post by uzdnabuzd »

Where are you measuring from? Pre or post turbo.
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Post by Mark2 »

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.
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Post by 4x4 guy »

egt should be measured before the turbo
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Post by Dzltec »

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
www.diesel-tec.com.au Ph 03 9739 5031
Ball bearing turbo upgrades for factory turbo vehicles. Got a diesel question just ask.
Home of the twin turbo shorty and many 150rwkw+ patrols.
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Post by benhl »

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
GU 4.2 TD Garrett BB Hi-flow, M8274 + Bells & Whistles with plenty of fruit still on the list!
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