As low as $285.00
RallySport Direct proudly carries Genuine Subaru STI components for those of you who want to maintain your vehicle using a proven product.
On this page, you are looking at the Subaru STI 1.3 BAR Radiator Cap.
Here are the details:
- Higher pressure than stock
- Raising the pressure in the cooling system raises the boiling temperature to hold in more heat
- NOTE: Some models have 2 caps one being in the radiator and the other being in the expansion tank-replace both caps to improve cooling efficiency
- NOTE: Will not fit BRZ/FR-S models
- Sold individually
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pay extra for the Pink STi...
Steve Li 5 years ago
you must not able to find the difference with others...(ie. Cosworth..) but the price double. Worth or not, make your judge. I paid the extra for the pink label and STi...
Same as OEM with cheap sticker
waness 7 years ago
Looks good under the hood but that's it..
STi Guru 7 years ago
This was not worth the money I paid. It looks nice under the hood but it is just a sticker on the cap and I'm expecting it to peel of any day now.
QUESTIONS & ANSWERS
Q: Why would you... mmcnutt 4 years agoAnswer
need to use two of these? The stock radiator cap is 1.37 bar, so would you just need it for the upper reservoir? Also, why are the stock caps two different pressure settings? I guess I don't understand what this product would do to increase cooling efficiency if the radiator cap is already a higher pressure
A: This cap will be a stock replacement for the radiator on STI models, but will be an upgrade for other Subaru models. STIs come with a higher pressure cap on the radiator than the expansion tank for proper venting. Many people use the same pressure caps for both the radiator and expansion tanks and we have not had any issues reported, but Subaru does put a higher pressure cap on the radiator from the factory.
Zach G. 4 years ago
A: No reason to replace the radiator side UNLESS you go to a 1.5 Bar on that side and 1.3 Bar on the filler side. It is important to keep the differential between the two 'tanks' to properly move coolant back and forth. FYI per the Subaru on the STi: 0.965 - 1.240 Bar Filler Side operating range of the OEM cap 1.240 - 1.550 Bar Radiator Side operating range of the OEM cap
PerryStevenM 2 years ago
Q: Color of Rubber in the cap Gasaraki 4 years agoAnswer
I've noticed that your in pictures the rubber parts are black. Are there ones that have the blue rubber?
A: I am not aware of an STI cap with blue rubber.
guest56ad69792a8d256e198b66b5 4 years ago
Q: potential problems?? ctom24 6 years agoAnswer
Quick question, is it possible that adding more pressure to the stock cooling system will cause an gaskets to fail sooner like the head gasket? Also is it possible that the hoses may blow as well or is it not THAT much of a pressure difference?
A: That is a great question. Increasing the pressure of the cap will increase the pressure of the entire coolant system, but this is almost negligible when talking about the headgaskets due to the incredibly high pressures they deal with during normal operation. We have not noticed any increased failures with the hoses, but if you are using a high mileage stock radiator, you will want to pay close attention to where the plastic top portion meets the aluminum core as that area is already prone to leaking and higher pressures may increase the risk of a leak. If you have already upgraded your radiator, adding higher pressure caps is always ideal as it will effectively raise the boiling point of the fluid in the system, thus preventing any boil-overs on the street and track.
Rick C. 6 years ago
This Part Fits
This item is non application specific.
Please verify compatibility before purchase. May require some modification for proper installation.