I have an 05 sti that i have barely got. and i have been trying to gather as much data. but i have been wondering how much really can stock ej25 take before blowing. like is it safe to add a bigger turbo with stock internals?
How much horsepower can the stock ej25 sti take before blowing!!!
Jhovan VIllasenor
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I have an 05 sti that i have barely got. and i have been trying to gather as much data. but i have been wondering how much really can stock ej25 take before blowing. like is it safe to add a bigger turbo with stock internals?
Welcome to the forum, a lot of the information you want to learn is located in the stickies on the forum. There are many turbo upgrades that are safer than others, but no turbo upgrade is ever going to be 100% perfect. I've seen people with 450 whp on the stock internals, but with that kind of power, it's just a matter of time before something breaks. If you go larger than a GT30R it's recommended that you start saving for a "new engine fund".
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Your engine and can blow with as little as 300 whp with a bad tune. There are plenty of STIs out there making well over 400whp also, but the general concensus in this forum about how much WHP the STI block can handle is 400whp. However, I have never seen an scientific data to support any of it, so take it all with a grain of salt. Just make sure you try to learn as much as you can about your car, parts available, what works, what doesn't work, proper monitoring including gauges, and datalogging, and a general understanding of some common tuning practices and your car will last you quite a while with the extra ponies be pushed through it. Either way I would always be prepared to be rebuilding the engine at some point.
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Its all on the quality of the tune. There are stockers that blow up and there are monsters that some how stay whole. Find a tuner with experience and see what he or she is comfortable doing given your goals and financial means. Because any non stock turbo applications require a professional tune anyway.
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I'm sure it begins with it... but does it end with it? Meaning, your driving style must play a HUGE factor in it. I am not pushing big power, but I was wondering what your driving style was? Even with the greatest tune, if someone is ragging on their car 90% of the time I think the stock block (pistons etc) would give... please correct me if I am wrong.JDM-STI said:
400whp will take the breath away from any unprepared passenger. 
Also, all dynos read differently so a final whp# is apples to oranges.
Ex, I know of a mustang dyno that reads 12%-15% lower than a Dynojet with the same operator on the same car. In this case, 400whp=350whp or in reverse, 400whp could = 450whp depending on which way you are comparing it.
400whp on a high reading dyno is still a lot of power and is a big improvement over stock which would read about 240whp on this same dyno.
As for whp limits with stock block, 450whp on a high reading dyno is prob near the limit and even that will require a careful tune and inteligent use and monitoring. Also, the intended use needs to be considered. A car that will be raced for 25 minutes on a roadcourse will need a safer tune than a street guy that will only occaisionaly tap into all of the whp.
I usually race in time attacks which are one warm up lap followed by 3 race laps and then 1 cool off lap for about 10 minutes of abuse. In practice, I do about 20 mins but usually not at the same pace as there is traffic and I'm usually testing out items on my car or checking out some new lines.
Also, all dynos read differently so a final whp# is apples to oranges.
Ex, I know of a mustang dyno that reads 12%-15% lower than a Dynojet with the same operator on the same car. In this case, 400whp=350whp or in reverse, 400whp could = 450whp depending on which way you are comparing it.
400whp on a high reading dyno is still a lot of power and is a big improvement over stock which would read about 240whp on this same dyno.
As for whp limits with stock block, 450whp on a high reading dyno is prob near the limit and even that will require a careful tune and inteligent use and monitoring. Also, the intended use needs to be considered. A car that will be raced for 25 minutes on a roadcourse will need a safer tune than a street guy that will only occaisionaly tap into all of the whp.
I usually race in time attacks which are one warm up lap followed by 3 race laps and then 1 cool off lap for about 10 minutes of abuse. In practice, I do about 20 mins but usually not at the same pace as there is traffic and I'm usually testing out items on my car or checking out some new lines.
I don't rag out my car at all. With that said, I do drive it like it was meant to be driven. I think that a good safe tune and staying on top of checking your oil, etc, is the key. I've driven my car at 490whp (dynapac that reads a bone stock STI @ 250whp) for well over a year and my car doesn't even use any oil. So take that for what its worth.eXstasy said:
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