Increasing water temps and mapping

Increasing water temps and mapping

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Discussion

roseytvr

Original Poster:

1,788 posts

177 months

Tuesday 22nd April 2014
quotequote all
Guys

Fitted a new engine last year and replaced all hoses, pipe work and uprated the rad to a three core. Fitted an aftermarket Ecu and had it all set up and mapped on a rolling road. The car runs a treat but fuel consumption is down to 18 mpg on a gently motorway cruise and much lower obviously when I boot it. The running temperature is much reduced, probably only 60 degrees ish unless in traffic or after a spirited drive. The plugs aren't bad but a little blacker than I would expect to see and the car always gets a good run when used. At a guess the ecu is probably enriching the mix because of cold operating temperatures, and this is causing reduced fuel consumption. Does this sound about right or am I talking total bcensoreds?

Reading the bible optimum temperature is approx72 degrees when cruising and I am someway below this. I can partly cover the rad to increase running temperatures. Question is if I do this will it effect the mapping requirements of the engine or just bring it up to the suggested parameters ie do I need to get it remapped?

Any comments or opinions appreciated
Rosey


Edited by roseytvr on Tuesday 22 April 22:29

spitfire4v8

3,990 posts

180 months

Tuesday 22nd April 2014
quotequote all
What you're describing sounds like it may be at least partly the cause of your poor economy.
First thing is to get the cooling system maintaining a proper temperature, then go back and revisit the mapping and see if it needs changing at all.

TV8

3,118 posts

174 months

Tuesday 22nd April 2014
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Hi Ian, where are you getting the temperature from? The gauge or the ECU logs?

Chuffmeister

3,597 posts

136 months

Wednesday 23rd April 2014
quotequote all
I'd connect it up to the laptop and read the running water temp from there. The TVR gauge is really inaccurate as is the location of the original sender. Most cars are designed to run around the 90degs mark, with the fans kicking in about 95 IIRC. On a steady cruise mine ran between 86-88, quickly rising as you slow down. So I would say anywhere between 85 and 95 is normal operating temperature.

griffdude

1,819 posts

247 months

Wednesday 23rd April 2014
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Is the thermostat working?

TVR Beaver

2,867 posts

179 months

Wednesday 23rd April 2014
quotequote all
yes.. even if cooling more than the heat given out by the engine, the stat should close maintaining the engine temp... do you know what stat you have ?.. I run a 82 deg unit wink

roseytvr

Original Poster:

1,788 posts

177 months

Wednesday 23rd April 2014
quotequote all
Thanks for the comments guys

TV8 said:
Hi Ian, where are you getting the temperature from? The gauge or the ECU logs?
How are you Graham, sounds like yours is sorted - taking the temp from the gauge, will have a look at the logs when I get chance. Will try to also get my hands on a digital thermometer to try and accurately gauge the temperature.

Chuffmeister said:
I'd connect it up to the laptop and read the running water temp from there. The TVR gauge is really inaccurate as is the location of the original sender. Most cars are designed to run around the 90degs mark, with the fans kicking in about 95 IIRC. On a steady cruise mine ran between 86-88, quickly rising as you slow down. So I would say anywhere between 85 and 95 is normal operating temperature.
Christian how does the ecu measure temperature, is it from the same sender? My fans are kicking in at mid 90 on the gauge which indicates to me the gauge isn't far out but I could be wrong.

I don't know what stat I have but think I will change it just in case. Will post up more when I know more!

Chuffmeister

3,597 posts

136 months

Wednesday 23rd April 2014
quotequote all
My TVR gauge is totally inconsistent. I connected Rovergauge to mine and took it for a spin. It takes the reading from the sender in the top of the manifold, next to the original Landrover sender. Much more accurate than the TVR sender at the front of the manifold.

TV8

3,118 posts

174 months

Thursday 24th April 2014
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Hi Ian, all good with me thanks and you I hope? The new car is running very well. It still gets through plenty of Shell V power but no where near as bad as yours on a run. Do you have an AFM gauge or have you had it on a rolling road to check the fuelling?

gacksen

680 posts

142 months

Thursday 24th April 2014
quotequote all
roseytvr said:
Guys

Fitted a new engine last year and replaced all hoses, pipe work and uprated the rad to a three core. Fitted an aftermarket Ecu and had it all set up and mapped on a rolling road. The car runs a treat but fuel consumption is down to 18 mpg on a gently motorway cruise and much lower obviously when I boot it. The running temperature is much reduced, probably only 60 degrees ish unless in traffic or after a spirited drive. The plugs aren't bad but a little blacker than I would expect to see and the car always gets a good run when used. At a guess the ecu is probably enriching the mix because of cold operating temperatures, and this is causing reduced fuel consumption. Does this sound about right or am I talking total bcensoreds?

Reading the bible optimum temperature is approx72 degrees when cruising and I am someway below this. I can partly cover the rad to increase running temperatures. Question is if I do this will it effect the mapping requirements of the engine or just bring it up to the suggested parameters ie do I need to get it remapped?

Any comments or opinions appreciated
Rosey


Edited by roseytvr on Tuesday 22 April 22:29
what ecu are you running ? wideband lambda ? can you read out values ?

phazed

21,844 posts

203 months

Friday 25th April 2014
quotequote all
Good topic Ian.

With my Ally rad, increased airflow through the nose I may well have the same problem.

On a 70ish mph cruise in this weather, I'll be registering about 65degrees.

My mpg is appalling as well, 150 miles or less average from a tank, maybe 180 on a run.

Gauge works fine, fans coming on at about 90 degrees iirc.

gacksen

680 posts

142 months

Friday 25th April 2014
quotequote all
aftermarket ecu, ally rad, spa gauges, clives piece in front water temp on the autobahn at around 120kmh is around 70-75.
it seems to be quite rev dependent. anything below 2K or little above and the temp won´t rise. if youre above 2.5 no problem
it will go up to 80 and above.

roseytvr

Original Poster:

1,788 posts

177 months

Sunday 4th May 2014
quotequote all
Seems like an easy fix - bought a new 82 degree stat just in case the stat was knackered even though the engine is only 12 months old. Took off the housing today to change it to find literally nothing. No thermostate fitted by my so called expert engine builder!! No wonder it's running cold!

All back together and temps upto to 82 degrees when crusing. Oil and filter change to follow!!

Peter - check your stat!!

Thanks for your input all.

phazed

21,844 posts

203 months

Sunday 4th May 2014
quotequote all
roseytvr said:
Seems like an easy fix - bought a new 82 degree stat just in case the stat was knackered even though the engine is only 12 months old. Took off the housing today to change it to find literally nothing. No thermostate fitted by my so called expert engine builder!! No wonder it's running cold!

All back together and temps upto to 82 degrees when crusing. Oil and filter change to follow!!

Peter - check your stat!!

Thanks for your input all.
Honestly, who can ye trust!

Alexdaredevils

5,697 posts

178 months

Sunday 4th May 2014
quotequote all
That's a pisstake! I'd be ringing that certain person up for a ass whopping

Ally rads, cruising speeds etc should have no effect on running temperature guys

The thermostat regulates the engine temps keeping the engine roughly the same temperature all the time except warm up

Unless you're Ian and don't have one!

Edit - tvrbeaver beat me to it

MPoxon

5,329 posts

172 months

Sunday 4th May 2014
quotequote all
roseytvr said:
No thermostate fitted by my so called expert engine builder!! No wonder it's running cold!
WTF!!!!

roseytvr

Original Poster:

1,788 posts

177 months

Tuesday 6th May 2014
quotequote all
To put this to bed, the running temp is all sorted now. Checked fuel consumption on the way home, averaged 17 mpg all year but now up to 25 mpg on my way back from Bedford TD today, result!

Need to sort out the censoredcensored who built an engine without a stat tomorrowpunch

I will start a new thread on what I need to check to make sure there is no permanent damage.

Peter - change your stat!

phazed

21,844 posts

203 months

Tuesday 6th May 2014
quotequote all
Noted. smile

SILICONEKID346HP

14,997 posts

230 months

Tuesday 6th May 2014
quotequote all
phazed said:
Good topic Ian.

With my Ally rad, increased airflow through the nose I may well have the same problem.

On a 70ish mph cruise in this weather, I'll be registering about 65degrees.

My mpg is appalling as well, 150 miles or less average from a tank, maybe 180 on a run.

Gauge works fine, fans coming on at about 90 degrees iirc.
If it`s 65 degrees it will not be running on closed loop so not trimming the mixture . I think most set the parameters to kick the closed loop in at 72 degrees .

I`m not sure if mine is working on closed loop because on cruise i only see about 65 degrees .

SILICONEKID346HP

14,997 posts

230 months

Tuesday 6th May 2014
quotequote all
roseytvr said:
To put this to bed, the running temp is all sorted now. Checked fuel consumption on the way home, averaged 17 mpg all year but now up to 25 mpg on my way back from Bedford TD today, result!

Need to sort out the censoredcensored who built an engine without a stat tomorrowpunch

I will start a new thread on what I need to check to make sure there is no permanent damage.

Peter - change your stat!
Do you mean otter or stat ,i might have a look if mine is fitted .