Protective and Compensating Modifications for Engine and Powertrain

[SC4Runner]

I’ve mentioned this in another thread quite a while back but didn’t get much response as there still weren’t many bolt-on performance modifications. Currently, we have a lot of engine modifications that can be done to really push the limits of these 4Runners. With an upgraded intercooler, charge pipes, Downpipe and a compensating tune, I’m easily sitting in the 350-370 HP range. If I throw an updated turbo at it and the next compensating tune, it’s possible to be in the 390-420 range. With all that in mind, outside of a more aggressive maintenance schedule, what can be done to ensure longevity? Realistically, I know I’ll be adding a transmission cooler, but I’m not hearing much about oil coolers, bigger radiators and catch cans. I’ve yet to see anyone add a bigger radiator or an oil cooler. Catch cans have been installed by a few people, but they aren’t seeing much value.

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[127.0.0.1]

This toyota engine already has it's own oil catch system. it is not just a PCV valve redirected to the intake like old-school, it is more involved.

This is a fully closed-loop PCV system with an integrated oil separator (Ventilation Case #1). It's more sophisticated than a traditional single PCV valve setup.

 

[NotApplicable]

I have not heard of anyone seeing oil temp issues that would motivate an oil cooler…

if you were truly looking to modify your 4R for longevity, maybe one of the tuners could come up with a de-tune to run it at 80% power/torque or something, lol

 

[SouthCoast]

increasing HP does not necessarily increase or maintain system longevity though. Chasing power can indirectly affect engine health. I'm not sold on the SXTH inter-cooler design with regard to flow numbers and pressure drop. changing from the crappy 0w20 water to a more robust oil, better HTHS, will do more for the turbo health than a charge pipe or tune ever could. What's your goal in chasing horsepower for this vehicle? And yes, there are a few owners on here who've stated the need for cooling the transmission for towing, hill climbing and off-roading.

 

[CuttingedgeSport]

Several good things to keep a tuned engine going reliably for an extended period….

I had a 2004 forester turbo XT with a GT30R stock mount pushing 300whp through an automatic that had 250,000 on the stock engine and head gaskets/stock trans when I sold it and it was tuned for 170,000 miles of that time.

1. Have a great tune on it and run quality gas all the time.

2. Expect to get some bad gas every once in a while and either ensure your tuner has some AFR boost-cut safety guard rails in place or monitor it yourself with a full time quality wideband AFR/Lambda meter. I also like the ethanol/alcohol meters and those are great if you are mixing fuels some for better detonation resistance.

3. Keep your ears open and be aware when pushing on it. If you hear slight rocks in a coffee can sound (detonation)or it is laying down and not making good power, get out of the throttle asap. Bad gas or another unforeseen issue can occur anytime on a stock or modded rig.

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