Upgraded radiator needed?
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lilskyline240
- Posts: 1887
- Joined: Fri Oct 14, 2005 9:55 am
- Car: 90 240sx w/ rb30det
Upgraded radiator needed?
Im going to be doin a rb25 swap into my Silvia this spring and an just wondering if the sr20 radiator would be enough cooling for a rb25? or should i go with a koyo unit?
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NISMO_RB25
- Posts: 1066
- Joined: Thu Nov 06, 2003 4:40 am
- Car: 1992 240SX with RB25DET, 1987 RX-7 TII
It will be fine with some good electric fans. The 25 sits close to the radiator making it difficult to setup your fans as pullers. With a thicker radiator the problem gets much worse. With that said what I did was notch the radiator support at the top and bottom, weld in a new bottom support and lean the radiator forward to give me clearance for a Koyo radiator and dual 12inch FAL fans.
You don't need to go to that extreme, but I do have some recommendations.
1) replace water pump, cheap and pretty easy to do while the motor is out of the car. (good time to replace the timing belt and tensioners as well)2) nismo thermostat, cheap and easy3) cooling panels top and bottom to direct air to your radiator.
If you have a redicoulsly thick intercooler like I do, the cooling panels are a must.
Have fun.
You don't need to go to that extreme, but I do have some recommendations.
1) replace water pump, cheap and pretty easy to do while the motor is out of the car. (good time to replace the timing belt and tensioners as well)2) nismo thermostat, cheap and easy3) cooling panels top and bottom to direct air to your radiator.
If you have a redicoulsly thick intercooler like I do, the cooling panels are a must.
Have fun.
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lilskyline240
- Posts: 1887
- Joined: Fri Oct 14, 2005 9:55 am
- Car: 90 240sx w/ rb30det
Re: (NISMO_RB25)
SO you think i should be find with my sr20 rad with some puller fans and a nismo thermostat?
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minivan_don
- Posts: 316
- Joined: Fri Apr 23, 2004 7:29 am
Re: (lilskyline240)
you cant go wrong with upgrading your rad to a koyo (or other) ...
things like the water pump and tstat are cheap insurance. using the stock sr/ka rad will be suffient but if you plan up pushing the rb harder any track time, then upgrading the rad should almost be a must. BUT you are working in a tight space to begin with so if you are planning to run electric fans ... just like others have found ways to make things fit nicer (or at all!)
things like the water pump and tstat are cheap insurance. using the stock sr/ka rad will be suffient but if you plan up pushing the rb harder any track time, then upgrading the rad should almost be a must. BUT you are working in a tight space to begin with so if you are planning to run electric fans ... just like others have found ways to make things fit nicer (or at all!)
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Kansei240sx
- Posts: 1356
- Joined: Mon Nov 01, 2004 10:17 am
- Car: S13 - RB25 Circuit car
71 240z - street/track day car
AE86 - Daily Drizzle/track day car
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Re: (blurrbosi)
Search for a few of my posts in recent threads about cooling, its been beaten to death and im leaning my radiator foward, ill have a thread showing my engine bay soon enough.