[wizard_of_oz]

I've been told that I need a FMIC to support my planned T66 upgrade, but I've also heard horror stories about FMIC's and cooling on the track.

The only FMIC that explicitly mentions airflow to the radiator is Apexi. Is that large enough for a single?

 

[Steve Jarvis]

I believe Reg ran the stock intercooler in the One Lap of America (placed fourth). His car had a single and I believe made in the low 600 rwhp range. I think you will be giving up some horsepower with the stock intercooler, but I would rather give up some horsepower and not overheat the engine. When I go single, I will probably run a T66 and I plan on using the stock intercooler or running two stock intercoolers.

Later, Steve

 

[carcnoid]

I have the Apexi with my SP60. The car was having some cooling problems in the heat of the day (105+ temps), but I seem to have tackled that now by channeling the airflow a little differently. I do, however, have the electric fans which most consider to be an extreme detriment to cooling.

 

[Spool]

Is it true that the stock IC will/might *pop* with a single at high boost?

Just curious about it's flow capabilities. I guess for road racing you'll be running lower boost anyway...but what about those times on the street...will the stock IC blow?

Just curious.

Later.



[ August 21, 2001: Message edited by: Hboostn97TT ]

 

[wizard_of_oz]

RPS seems to think that the stock unit will pop. Reg didn't seem to have any problems, though.

Anyway, I have a lot of other stuff to do before I can go single. I want to get the chassis and brakes sorted out first. If I can't get through the corners, the straights don't matter.

 

[Grant]

If you run high boost I think it might... I remember someone blew one up on the list a looong time ago, think it was Tozer with 28 psi + NOS, can't remember.

I've (Accedentally) pressure tested mine to 1.7 bar with no problems.

Andi now claims that a Supra with a big FMIC and an oil-cooled turbo will not overheat even on a roadcourse, with the stock radiator! I find this a little hard to believe myself.

[ August 22, 2001: Message edited by: Grant ]

 

[Andi]

Originally posted by Grant:
<STRONG>If you run high boost I think it might... I remember someone blew one up on the list a looong time ago, think it was Tozer with 28 psi + NOS, can't remember.

I've (Accedentally) pressure tested mine to 1.7 bar with no problems.

Andi now claims that a Supra with a big FMIC and an oil-cooled turbo will not overheat even on a roadcourse, with the stock radiator! I find this a little hard to believe myself.

[ August 22, 2001: Message edited by: Grant ]</STRONG>

I don't claim that this will always be the case, all I claim is that Peter's coolant temp gauge never moved on that 100 degree day, and you saw the videos in his car and in mine! And my gauge moved! (I'll be able to tell you exactly what temp in a few days as I'm installing a 3 gauge pillar with a coolant gauge in a matter of hours, and road racing at TWS again this weekend.)

I'm defintiely going for an oil-cooled-only single turbo when I get the $. This is the setup I'd recommend -- with an oil cooler..

Andi

 

[Eric]

Originally posted by Grant:
<STRONG>
Andi now claims that a Supra with a big FMIC and an oil-cooled turbo will not overheat even on a roadcourse, with the stock radiator! I find this a little hard to believe myself.

[ August 22, 2001: Message edited by: Grant ]</STRONG>

I haven't done any testing to confirm this, but I doubt the lack of water cooling is what made that single equipped car run cooler at the racetrack than a comparable BPU car. My guess would be that the reduced restriction on the exhaust side is what helps. Somebody on the mkiv list (Lance I think) said that the stock turbos have a terrible pressure ratio, with pressure in the exhaust manifold being 3 times that of the intake manifold. With a single, and much better exhaust flow from a header and bigger exhaust housing, less heat gets retained in the head area, and there is less load on the cooling system. I'm pretty sure the heat removed from the turbo by water cooling isn't very significant compared to the load on the cooling system as a whole since the amount of coolant that flows through the turbo just isn't that much(look at the size of the hoses and pipes).

 

[Grant]

Originally posted by Eric:
<STRONG>I haven't done any testing to confirm this, but I doubt the lack of water cooling is what made that single equipped car run cooler at the racetrack than a comparable BPU car. My guess would be that the reduced restriction on the exhaust side is what helps. Somebody on the mkiv list (Lance I think) said that the stock turbos have a terrible pressure ratio, with pressure in the exhaust manifold being 3 times that of the intake manifold. With a single, and much better exhaust flow from a header and bigger exhaust housing, less heat gets retained in the head area, and there is less load on the cooling system. I'm pretty sure the heat removed from the turbo by water cooling isn't very significant compared to the load on the cooling system as a whole since the amount of coolant that flows through the turbo just isn't that much(look at the size of the hoses and pipes).</STRONG>

Thats a good point, I've heard people mention the huge amount of backpressure is what blows our wastegate open at BPU, preventing us from getting 30+ psi of boost like Chris B. was with his wired shut wastegate. I know for sure that the extra heat and pressure causes detonation.

I don't see how an oil-cooled turbo + oil cooler would be any better than a water cooled turbo with an additional small radiator instead of an oil cooler. I mean either way the turbo is generating X amount of heat. It has to go somewhere, either disipated into the air by the radiator or by an an oil cooler. I guess that really says something good for our cooling system that Peter's car was fine (and out-running a Busa at 29 psi!!).