[therobesons]

For My 1990 HF with a 92-95 D15B7 engine used only for cruising down the freeway, what temp Thermostat should I get. 160, 175, 180 or?

I just want what's best for the engine, best for MPG, I DO NOT hot rod it at all.

TIA Bob

 

[Charles]

Just go with stock. Honda engineers are pretty bright.

 

[bobski]

Just go with stock. Honda engineers are pretty bright.

IIRC, ideal coolant temp is 180°F. Thermostats open progressively over a range of temperatures... What exactly are they measuring for the temperature spec?

 

[Charles]

Just go with stock. Honda engineers are pretty bright.

IIRC, ideal coolant temp is 180°F. Thermostats open progressively over a range of temperatures... What exactly are they measuring for the temperature spec?

Stock begins to open at 172F and is fully open at 192-194F... at least for an Si. Who knows with an HF, but I would think it would be the same.

See my thread regarding OEM vs. aftermarket thermostats. Go with OEM.

 

[BlackCRX]

agreed, oem is best

i made the mistake of ordering a jackson racing low temp thermo 160F

it was great during summer but winter is a bitch
when its really cold outside and you downshift for a couple of blocks and the coolant temp would drop. once the coolant temp drops the ecu thinks its in "warm up mode" and changes ign/fuel. this is very bad on a boosted motor as the afr's would go really rich
also in the winter it takes a while for the car to get into fully operating temps

common mistake ppl make is that they assume a low temp thermo will increase performance and what not
but as stated above, if the ecu thinks its in warm up mode the car will actaully burn more fuel and most likely run slower

 

[therobesons]

Where would I find out the "Stock" calls for?

My Honda repair manual on CD does not tell me.

TIA

Bob

 

[Charles]

Call Honda.

 

[Boats]

I did some digging on it, and the 1990 HF thermostat is also 172F.

http://www.prostreetonline.com/oem/wiza ... Thermostat