RB25 is now overheating!!

[Imissmyturbo]

I haven't had much problems with the car running hot unless I am sitting in traffic. But then I installed my FMIC and the car runs much hotter then before and if I don't keep moving it will overheat. With the PFC I used to see about 80-90 degrees while driving. Now it keep climbing up to 98-105 and the temp gauge at that point starts to go north. I guess I pretty much have to take the FMIC off and put my water/Air IC on. I am willing to try hood vents.....Any other sugestions?

[JonPowell]

What fans are you running? Is your thermostat sticking?

[Imissmyturbo]

I don't think fans will help. I have an airflow problem to my radiator. Even a larger radiator won't help if there isn't air getting to it. I just wonder how others with FMIC's are doing it.

[JonPowell]

But fans can help force air through the intercooler, or suck it through and push it onto the radiator....

I know of at least one RB25 with a frontmount that has no problems with overheating thanks to the 10" and 12" electric fans....

[NISMO_RB25]

my car runs a little hotter than it did with the smic. I have a koyo and dual pusher 12' fans. I am probably going to wedge some pullers back in and use them instead. The pullers kept the car much cooler. I am also planning on making a belly pan to direct air a little better.

I got a recomendation from mckinney to run 20% coolant 80% water and some 40below additive from pepboys. (I haven't done it yet because I am waiting on a temp sender so my S13 cluster will read correctly)

[goofynick6]

make sure your fans seal up well and are not pushing air around the radiator.

Also, adding a small 3' x 3 inch strip of something at the base of the radiator that is on edge will direct air that is flowing under the car so it goes up thru the radiator..many stock vehicles have that and I guess it's important.

NIck

[Imissmyturbo]

Here is a few more thing about My cars temps. When on the highway going 65-70 MPH the temp stays around 95-100 degrees C. If I get on it the temps creeps up to 103-104 and it takes along time to bring it back down to 99 and under. If I get off the highway the temp will keep creaping up to over 100 slowly at which point I turn My heat on. It was pretty cool out last night 65-70 degree's F. I am very concerned about driving in higher temps 85 dgrees +. My cooler is a bar/plate and is 3" thick. Also the endtanks are in the front opening so there is no air flow at the end tanks. One idea I have is to put two small radiators/heater cores in each wheel well in the bumper. Also my clutch has started to let go when boost kicks in. And my Airflow meter is maxing out and flashing my check engine light. But my knock isn't shooting up in 4th gear like it was when the stock cooler was getting heat soaked.

[xjon]

I did what nismo said. My car started overheating or boiling over the reservoir when I am cruising. If I just idle it it would cool down. That was with 50/50 coolant. So I drained the radiator and added the 40 below to it and added h2o (no coolant). No more boiling over.

I have a fmic with a dual 12" pusher, stock radiator, stock thermostat and h20 pump. And no heater to turn on inside the car. Also with air temps of 90*+ in So.Cal. Running fine even when I'm running it hard. Don't have actual temp numbers though. Using ka cluster with rb temp sensor.

[Imissmyturbo]

I got some pics to post up that will give you some idea of what I am talking about: Does Nico have a host?

[xjon]

For pics see members rides. For vids, no.

[Imissmyturbo]

http://www.we-todd-did-racing....D.jpg

[Imissmyturbo]

This is what my setup looks like.....Getto intercooler install. There wasn't any brakets on the IC so I couldn't mount it solid. I made a brace that goes from the lower rad suport to the IC to hold it's weight.As you can see not much room for fans. Also that is the water to Air IC I have. Any idea what it's good for HP wise?

[boost_boy]

Hmm, at worst case scenario, you may want to make sure that headagsket didn't get smoked somewhere along the way. When these motors heat-up like you said, it's because there's a possibility that water is meeting combustion. My CA did that and the plugs looked fine, but the car just kept heating up while giving it a hard run on the highway, come to find out the head bolts stretched.

Dee

[goofynick6]

Looks like very little space for air to get thru to the rad with that bumper and ic setup..

That little fan is the same cheap one I have ..haha..hope mine works ok until I get another pusher to go with it.

Nick

[Imissmyturbo]

It doesn't work that well at all. It just slows down the overheating. I have another one just like it to go beside it. Not sure if it will clear the PS pump though.

BTW: My car is not "overheating" It is just running hot. It hasn't boil over at all. I am not sure what temp is considered "overheating" but I beleave the temp should stay under 100 degrees C at all times.

[NISMO_RB25]

If you have the room, the low profile Flex-a-lite fans push or pull much better than the fan you are using. That is the reason I am going to switch back to them.

[Projex240]

dont go with anything mor than 40 percent water in anything runnning with boost in a mid to hot climate area. Use the 40 below or use water wetter. The water wetter I used dropped the temps in my car almost 15 degrees.Also---you can use both a puller and pusher type of fan if you have room betweent he rad and the fmic. Going a more permenant route (and extreme) would be to cut releif holes in the front bumper to allow for more air.

Just a thought.....

[Imissmyturbo]

I think my coolent to water mix is about 60% water to 40% coolent. I could go with more water and see if it helps. How weak can I go in my coolent mix till boiling is a problem. I would like my boiling point to be now lower then 110 C. I am also going to get myself some water wetter. I was thinking of hood vents as well as a pig nose bumper would help get more airflow as well as vent the hot air from under the hood.

[xjon]

Get 40 Below. It is better than water wetter. Water wetter only claims to bring it down 20* and 40 below brings it down 40*. Hence the name. Autozone has them both. I took the coolant out of my radiator completely. Only time it's critical to put coolant in is for the antifreeze properties. The more water in your system the better cooling you'll get.

As far as hood goes I put spacers in my hood. Ricey but I think it helps when I park my car let the heat escape.