MPG loss ?? why - Civinfo
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post #1 of 28 (permalink) Old 11th July 2018, 10:19 Thread Starter
 
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MPG loss ?? why

had my CTR for about 5 months and have decided to fit a HKS induction kit , previously i was doing between 24-27 mpg
after installing the hks induction kit im now sitting at around 15-17 mpg
is this normal or have i done something wrong ??? i dont want to F**k up my car

thanks in advance
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post #2 of 28 (permalink) Old 11th July 2018, 10:25
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Do you drive flat out everywhere? My modded Fn2 got around 32mpg with mixed driving, so your initial mpg is poor. Car running OK, any smells or brakes binding?
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post #3 of 28 (permalink) Old 11th July 2018, 10:41 Thread Starter
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8 times out of 10 i drive casual not even going past 4k revs same driving as before i fitted the induction but ive lost like 10mpg
and Rear brakes are squeaking , ( getting pads changed tomorrow ) didnt think they would effect it that much ?

also having the issue of car getting really hot too quick , 15 min of driving the gauge is up 3 quaters

thanks for the prompt reply's


also when i do hit v-tec i do sometimes get like a hot smell through the vents
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post #4 of 28 (permalink) Old 11th July 2018, 11:00
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Is the air filter on the RSK clean?
Tyre pressures OK?
Any rough idle, strong petrol smell, misfires etc?

The temp should reach peak in 15 minutes of driving

Last edited by flashy; 11th July 2018 at 11:05.
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post #5 of 28 (permalink) Old 11th July 2018, 11:09
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Any codes at all? I feel like the temperature / MPG is related - Possibly a sensor that hasn't been fully reconnected after installing the induction kit causing it to run rich?
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post #6 of 28 (permalink) Old 11th July 2018, 13:10
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Something not right there, sorry for printing the obvious. I would go over all your fittings and hoses and make sure all that should be connected is connected.

Did this only start after fitting the HKS?
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post #7 of 28 (permalink) Old 11th July 2018, 18:28
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as already been said
either the kit has upset your mixture settings or something not fitted correctly sensor not in right place or air leaks or similar
remove replace standard to test
then you can refit and take your time to make sure you are fitting correctly
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post #8 of 28 (permalink) Old 12th July 2018, 20:30 Thread Starter
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Quote:
Originally Posted by flashy View Post
Is the air filter on the RSK clean?
Tyre pressures OK?
Any rough idle, strong petrol smell, misfires etc?

The temp should reach peak in 15 minutes of driving



Idles fine , gauge sits just below half way and stays there
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post #9 of 28 (permalink) Old 12th July 2018, 20:31 Thread Starter
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Any codes at all? I feel like the temperature / MPG is related - Possibly a sensor that hasn't been fully reconnected after installing the induction kit causing it to run rich?

no faults , took to a mechanic today and says its fitted correctly =/ just lack of cold air getting to it ?
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post #10 of 28 (permalink) Old 12th July 2018, 20:36 Thread Starter
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Originally Posted by Bones126 View Post
Something not right there, sorry for printing the obvious. I would go over all your fittings and hoses and make sure all that should be connected is connected.

Did this only start after fitting the HKS?

yes when stock was on it i was getting 26- 28mpg with my driving


currently on screen atm is 18.5mpg


cant feel any leaks etc all hose clips are on correctly and everything tightened and sensor in correctly not angled etc



just sitting here baffled to what else it could be
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post #11 of 28 (permalink) Old 12th July 2018, 21:01
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remove replace standard to test
then you can refit and take your time to make sure you are fitting correctly
Have you tried that? If so, what was the result?
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post #12 of 28 (permalink) Old 12th July 2018, 21:14
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Heat soak, especially in this heat with the hks
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post #13 of 28 (permalink) Old 12th July 2018, 23:26
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What is heat soak? And wherever it is, would it make that much difference to fuel consumption? From 26 MPG to 16 MPG. It has to be something other than hot air into the intake surely?
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post #14 of 28 (permalink) Old 12th July 2018, 23:39
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Quote:
Originally Posted by M8TJT View Post
What is heat soak? And wherever it is, would it make that much difference to fuel consumption? From 26 MPG to 16 MPG. It has to be something other than hot air into the intake surely?
Reduction in density of air due to heat, and being too hot for efficient operation. Personally, I wouldn't have expected heat soak to reduce efficiency by 10MPG, Or cause a drastic increase in engine temperature as described in OP, especially as it's only after a change in intake.

Do you have any pictures of the installation that others could compare to? I don't think that HKS Would be long for the intake business if every time the temperatures creep above 20c performance drops through the floor
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post #15 of 28 (permalink) Old 12th July 2018, 23:47
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Presumably that's why the standard air intake is at the front of the engine bay to get cool air from under the front of the bonnet rather than that which must be a lot hotter at the back as per the HKS induction kit. Or does the kit somehow scoop cold air from somewhere that is not apparent to me in the various pics of it?
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post #16 of 28 (permalink) Old 12th July 2018, 23:49
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Perhaps the OP got an air lock in the system when fitting the RSK and it's messing the thermostat / temp sensor causing over fuelling. But like a car running with the choke out.
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post #17 of 28 (permalink) Old 13th July 2018, 07:32
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The fact your temp guage is going up to 3/4 should be the first cause of concern!!

I'd get that looked at first mate, by replacing the coolant hose in the kit you've either introduced an airlock or drained the coolant too low. Get that addressed first and it may resolve the issue, this heat with a hot air intake will drop a few mpg but not by that amount.
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post #18 of 28 (permalink) Old 13th July 2018, 12:23
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Has the car been serviced? plugs oil etc and get the valve clearances checked.

If you've got an airlock in the coolant system you need to bleed the system to ensure its gone.

Check your rear callipers as they might be sticking, and finally, tyre pressures, see if it goes back up...

I'm sitting at 32-36mpg on cammed and bolt on modded FN.
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post #19 of 28 (permalink) Old 14th July 2018, 12:29 Thread Starter
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Have you tried that? If so, what was the result?

Removed the lot and replaced , same result
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post #20 of 28 (permalink) Old 14th July 2018, 14:43 Thread Starter
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Picture of it installed








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