black98ws6ta

iTrader: (77)

I am working on a ls1 swapped fd rx7. I built a turbo kit for it and it doesnt like to stay cool. If I let it idle it will stay at 185 degrees, if you drive it around and the egt's rise then the temp will rise as much as 239 degrees. If you dont get on the car and just let it cruise they will stay around 205 degrees. Pre turbo kit the car didnt overheat or have any problems.

Now to the list of things that hinder/help its cooling:

it has a underdrive pulley that is 1.5'' smaller in dia then stock
I cannot fit a stock dia crank pulley due to space restrictions because of the turbo kit
it has hardly no flow across the radiator due to the intercooler and I cant see a way to make a passage
I did put a new good single 16'' fal fan
it has a 3'' thick aluminum radiator
the radiator has both inlet and exit on the same side but there is a divider in the end tank
It has a 160* thermo
the coolant is completely full, has no leaks, no air pockets
I have tried just water, water and coolant, and water/coolant/water wetter
I have flushed the system and it is clean

Now my questions/comments:
What do you think might be the biggest thing keeping it from staying cool?
What should I change?
Shouldnt egts be around 1,000 while crusing say on the expressway in 6th?
I am thinking of making a smaller bell for a 98 water pump so it will spin closer to stock rpms, does anyone think that will help?


TIA,

smokinHawk

iTrader: (48)

is there anyway you can relocate the intercooler or do something so the radiator gets good air?

EPP

iTrader: (22)

We added an electric water pump to the RX7/LS1 that we added an ATI ProCharger D-1SC to, it did help somewhat, although this car is also running hot. Bob

longrange4u

iTrader: (2)

Bob,

You guys thinking of adding that cooling bar solution that you have to your setup?

Jared

O'dell

iTrader: (1)

Can't really move the intercooler, space is very limited in the car. All those temperatures are with the hood off, so the radiator gets more airflow (runs a good 5+ degrees cooler with the hood off) but still not quite as much as it SHOULD get.

EPP

iTrader: (22)

Not really, this car is still on the stock bottom end at 563rwhp!!!! Bob

black98ws6ta

iTrader: (77)

I have seen many turbo set-ups with intercoolers that sit right infront of the radiator, so eventhough I know it doesnt help, it isnt the end-all in keeping it cool. Anymore ideas?

Anthony

WAHUSKER

iTrader: (4)

Are there any plastic shrouds around the radiator on an RX7 like there is on an f-body? Maybe you could create more of a vacuum if you added some.....

Note - on my NA motor a Mez elec H2O pump dropped the temps 10*.

black98ws6ta

iTrader: (77)

It does have a aluminum radiator shroud that we removed at the same time as the hood. I am only guessing that putting it back on wont change much. I have heard that the aftermarket pumps dont flow as well as stock and some people have noticed higher temps. I will check into it.

Anthony

FastKat

iTrader: (10)

Are you sure that's enough fan?... and it's coming on, right?? Did you try running without a thermostat? Also, how old is the radiator - there could be some mineral deposits in it if it's older... try and feel for any cool spots on the face of the rad.

black98ws6ta

iTrader: (77)

It is all the fan there is room for, 4-6 inches of the radiator is left oncovered. It is comming on and it is in the right polarity. I have not tried running without a thermostat. The radiator is preety new and in good shape, I cleaned it several times.

Anthony

JIMMYZZ28

Check the catalog on the fan that you have (FAL) on the bottom of every page of there catalog it tells you that there electric fans are not ment for use on multiple core radiators. Even though we do not sell spal fans any longer they have a line of fans that have larger motors and they can operate at higher static then the FAL fans. We sell our own type of 16" fan and it will pull 1900 cfm through the core that size at 15 FPI. This is happenin alot lately we are getting more and more of the people running this brand of fan haveing issues. There is three different manufacture that i know of that have 225 watt fan motors SPAL, Maradyne and Tripac. Be on the look out we have a 225 watt 17" fan comming out that will smoke them all. Please stay away from the FAL and Zirgo they did the worse out of them all when we tested them.

black98ws6ta

iTrader: (77)

Do you think changing the fan to a good 16'' spal version would take care of it alone? I had tried to get a fan from them first, but they were very hard to get ahold of. I think I sent them a email with no responce.

Anthony

goober35

iTrader: (1)

Is there any shrowding around fans right now.
What is the cfm's of the fans on the car right now.
What will it be if you change the fan.

black98ws6ta

iTrader: (77)

The only shrouding on the fan is what the fan itself has, other than that the fan sits on the radiator core itself. Here is a link to the fan that is on the car..it is the 398 syclone supposed to flow 2500 cfm on a 16'' version.
http://www.flex-a-lite.com/auto/html/syclone.html

goober35

iTrader: (1)

That is your problem. You are not pulling enuff air across because u do not have any shrowding. Build to buy something that covers the back side so u can pull the air from across the hole thing not just a small portion.

black98ws6ta

iTrader: (77)

I dont really understand what you mean...the fan itself sits on the radiator..to me it is shrouding itself except for the areas the fan cannot reach. Are you talking about making a shroud so the whole radiator is covered? Thanks

goober35

iTrader: (1)

Ok If you cover the radiator and cut a hole in it for the fan to draw the air thoughn this will alow more air to move across the radiator. This will help with cooling.
If you just stick a fan next to a radiator and try an pull air though it. The parts part that the fan is not on and some of the part the fan is on will not be cooled.

black98ws6ta

iTrader: (77)

Thanks alot I will try this tommorrow. I need to space the fan and piece that is going to cover the lengh of the radiator away about 1/4 of a inch to be effective right?

JIMMYZZ28

When you do the shroud it would be a good idea to make a few rubber flaps in the area around the fan so when you are at highway speeds you can get more air through the core. It will also help the life of the fan.