FlyAssHooptie

I just finished installing a S5 13bt into my '85 rx7, and was wondering what the optimum temperatures are, that a typical healthy running engine should be at (once warmed up that is).

I need to know coolant and oil temps, in order to set my cooling fans to kick on at the right time. Also, I'm not using stock rx7 radiator or oil coolers, so it's important for me to check if my new cooling systems are working propperly.

I'm also about to do some fine tuning of my fuel and ignition maps, and I've heard that exhaust gas temperature (EGT) is very usefull for checking ignition timing. All that I know about rotary EGT's as of right now is that they are higher than most other engines and can go up to 1900*F or something like that. So what is a good range for EGT on a 13bt (assuming that it's different under different engine loads)?

trainwreck517

iTrader: (1)

Water temps from 180-200 are fine.. I have my rad fans kick on at 200*F and shut off at 190*F... Oil temps are generally 10-20 degrees hotter then water... 215 water temps is about the highest you want to run.. and anything over 225 and you should start pulling off the road/track and shut down.

Hope that helps.

Also do you have an pics of your engine setup in the FB? I'm soon going to swap in a 13B-RE into a SA... looking for ideas to run the IC plumbing..

FlyAssHooptie

Thanks for the help man.

PM me an email address and I'll send you a few shots from different angles of my IC setup


I havn't worked out how to post them up here yet.


Also, any suggestions for exhaust temps, for various engine loads?

fidelity101

iTrader: (11)

what about for S4 NA?

NZConvertible

Those temps appy to pretty much all internal combsution engines.

RETed

This is more a function of the thermostat rating...unless you're running without a thermostat?


Search?

Depending on the probe location, it can hit 1600F pretty easily.
A lot of the (U.S.-made) EGT gauges are 1600F max - I find this a bit too low.
I run Japan-made EGT gauges which easily run over 2000F.


-Ted

FlyAssHooptie

Thanks for the info guys .... hopefully I'll get this engine tuning situation sorted out before the end of summer.

Reted: So you wouldn't recomend me buying say Autometer EGT gauge. What brand EGT are you running and what would you recomend as an ideal probe mounting location?

RETed

The Autometer EGT gauges only go to 1600F.
So, no, sheerly out of the fact that the rotary engine can easily "pin" those gauges.
I run all GReddy EGT gauges.


-Ted

arghx

iTrader: (3)

I mean EGT gauges are fine, but maybe you should just consider a wideband... I know they are not exact substitutes, but if you are getting the EGT gauge to detect a possible lean/detonation condition then just get the wideband. I run the AEM UEGO gauge, which has the controller integrated into the gauge and comes with the o2 sensor etc. You can get one for under $300 these days.

FlyAssHooptie

Yes a wideband O2 sensor, I agree is the best tool for tuning AFR. The EGT guage is for tuning ignition timing, in that if the EGT is too high, a solution is to advance the timing.

I was just wondering what a healthy turbo rotary's EGT should be. As a good starting point that is.

RETed

I just love the ignorant statements.


-Ted

FlyAssHooptie

So to summarize the EGT info so far .... Greddy is a good EGT gauge to go with because they go up to 2000. Also, a typical 13bt will reach 1600 easily (depending on probe location), so that would be a normal EGT to see if my engine is tuned properly.

Ok, now for the probe location. I was thinking about mounting it a few inches after the turbo. Is that a good place, or will it get too hot there?

Another thing, what's the highest the EGT should get to?