what temp does the !JZ thermostat open at??

[chosen1]

hey guys... im a bit of a newb when it comes to 1J's... im used to my 80 degree SR20 thermostat, but my 1J seems to have a 90degre thermostat???? - or there abouts... is this normal? r there any "cooler" thermostats available?

im not sure if it matters, but the engine has 264/272 cams, cam gears, GT35R, injectors, so it makes some heat..

[Lambolica]

Most 1j's and 7m come from Japan with 88 degree thermostats. Your friendly Toyota dealer should be able to get an 82 degree on to suit.

[urantia]

i got one from toyota just the other day, same one used in the prius, quite sure it was an 82C, but probably an 88C will have to double check.

[chosen1]

sweet. thanks guys.. given the oil cooler, intercooler and radiator setup that i have, i want to do everything i can to ensure the donk doesnt cook itself.

cheers

[chris davey]

I thought we worked out last time that it started to open at 82 and fully open by 92. The 1j runs pretty warm

[chosen1]

yeah, it doesnt go above 90, but at the same time, i like to keep as far from 100 as i can.. the engine has also been without water/coolant for about 9 months during the conversion, so i might just change the thermostat anyway...

[chris davey]

Mine sits at 83deg on the highway. Similar setup to you except stock cams, different turbo, chaser radiator. Gets warm quick when I slow down though.

[Lambolica]

Isn't the temp stamped on the thermostat?

It is on the ones I put in the 1G 9toyota ones that is)

[chosen1]

hmm, cant say i've looked that closely at it.. will check it out tonight..

[Robbos_Toyotas]

5m, 7m etc all use a 88" opening...from memory 1jZ's are meant to run at 95"c whereas 7m's etc are at 90"C

[ProjectSleeper]

Looking at the part numbers and specs...

P/N 9091603093 - 2JZ - 82 to 95 degrees...
P/N 9091603125 - 1JZ - 82 to 95 degrees...

[chosen1]

thanks heaps for the reply's guys... much appreciated !!!

[MR 1JZ]

on the topic of 1J thermostats...does anyone know where you can get cooler ones?

i.e. around the vicinity of 70-75 degrees?

I know they arent meant too run that cold but I am suffering with the problem that when out on the track if its sitting at 90 degrees while waiting to be flagged off to start drifting I am hitting 120 degrees rather quickly (i.e. 2-3 laps) and it can hamper my ability to get some decent practise in in the morning sessions before a competition...

if the temp was sitting on around 75 degrees before I take off then I would be able to get another 2-3 laps in, which would be about right as I would most likely need to change tyres before then anyway...

do TRD make different thermostats for the 1J?

Also bear in mind this car is not a road car anymore so sitting on the highway running too cool isnt going to be an issue

[chris davey]

I am sure that last time we talked about this on the old forums someone was going to use a 72 opening and 82 full open TRD thermostat for the 1jz so they must make them. I don't really know where you can get TRD stuff from though?

[1JZ.747]

i have tried to get a cooler one, my flat mate works at toyota in spare parts, and he says they do not exist after searching for 6 months.


82 is it.

you could try drilling holes in it.