Changing Rb26 Thermostat

[asps91]

Hey guys, I am going to do the 100k service sooner than I need to on my r33 gtr and was wondering if it's worthwhile or necessary to change the thermostat. Have they got a service life? Thanks

[GoHard]

I would. Ive had 2 rb's and both thermostats were missing some rubber (cracked off) so they were stuck open a bit. For $40 id be doing it if I were you.

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[asps91]

I would. Ive had 2 rb's and both thermostats were missing some rubber (cracked off) so they were stuck open a bit. For $40 id be doing it if I were you.

Will definitely do it then. Thanks mate

[djvoodoo]

Thread bump.

I have a nsimo thermostat ready to go in mine, but find it almost impossible to reach the top bolts which is directly under the intake manifold & next to the fuel lines. Any tips?

[Hadouken]

The thermostat is on the bottom hose

[djvoodoo]

The thermostat is on the bottom hose

Yep, I have no problem locating it, but getting the tools to undo the thermo housing is a pain in the ass. Should i try using a spanner from underneath the car? I just can't reach the bolt directly under the intake

[Hadouken]

Jack the car up. stick your head in there and use spanners sockets

[Ben C34]

Thread bump.

I have a nsimo thermostat ready to go in mine, but find it almost impossible to reach the top bolts which is directly under the intake manifold & next to the fuel lines. Any tips?

Is it a low temp one? if so I would think about whether or not to use it.

[djvoodoo]

Is it a low temp one? if so I would think about whether or not to use it.

Yep low temp - 65 degrees.

The car is running an a power FC, so i would have thought the standard ECU cold start/ enrichment ratios won't be affected from lower temp thermo?

What are your opinions on this?

[Dose Pipe Sutututu]

Yep low temp - 65 degrees.

The car is running an a power FC, so i would have thought the standard ECU cold start/ enrichment ratios won't be affected from lower temp thermo?

What are your opinions on this?

Check your temp correction tables in your PowerFC, see when the enrichment is cut out. Really depends how it is set, if it's set to cut out over 70 then you'll always be running with addition injection correction.

I still prefer factory spec thermostats, you would want your water temps about 80~90 as it will warm up your oil too (that's my opinion).

[Ben C34]

As John said. Also, if you have an overheating problem, a low temp thermostat will not fix it, just delay it.

[djvoodoo]

Car is not overheating. At idle stays at about 89 deg, and cruising between 89-92 depending on weather and style of driving.

My tuner mentioned that the thermostat is possibly sticking as when tuning he noticed the bottom hose didn't seem to warm up alot.

I had the opportunity to but the nismo item so i did!

Might end up selling it, but going to speak with my tuner first.

[Dose Pipe Sutututu]

I can't recall if you can see the temperature enrichment tables using the hand controller, if so see what the settings are like

it would be something like

50 = 1.15

60 = 1.10

70 = 1.05

80 = 1

90 = 1

100 = 1.10

110 = 1.20

etc...

Column A = Temperature

Column B = Enrichment Applied

[djvoodoo]

Yes, hand controller does show this. My settings are:

80+ 1.00 1.00

50+ 1.03 1.07

30+ 1.06 1.21

10+ 1.25 1.46

-10 1.50 1.75

-30 1.59 2.00

[Dose Pipe Sutututu]

you'll have some minor temperature enrichment as it will interpolate between 50 ~ 80 degrees

So say if your thermostat always reads 65 then on partial load your correction would be about 1.03 - ((80 - 50)/100 * 0.03) = 1.009 and on high load, i.e pedal down around 1.025

which isn't all that much, but you're burning extra fuel you don't need to lol

[Piggaz]

Leave the standard temp thermo in. Why run an engine cooler than what it was designed for? If its for an overheating problem, sort out your cooling, don't "band aid" the issue.

[djvoodoo]

Leave the standard temp thermo in. Why run an engine cooler than what it was designed for? If its for an overheating problem, sort out your cooling, don't "band aid" the issue.

Nope, no overheating problem. Cooling system is fine. After taking all your feedback on board, i will be going with a Tridon T"stat - 71 degree item.

But, for shits and giggles because i have the Nismo T"stat lying around, I chucked it in anyway today to see how much difference it really makes.

On idle sat at roughly 70-72 degrees, and cruising and giving it a bit water temps were between 78-80

Not overly cold, but still on the colder side of temps.