Stock internals...How much can they take? - S2000 Forums


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Old 05-21-2008, 03:57 AM   #1
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Stock internals...How much can they take?

Hey guys, I was wondering how much psi the stock internals can take. As well as how much hp the tranny can take?
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Old 05-21-2008, 12:19 PM   #2
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It's not a matter of psi that limits these engines, but power. Generally ~500 is the safe mark with a head gasket, some say 600. It all depends on the tune. There are many in the high 400's, even in the 500's with stock transmissions without problems.
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Old 05-21-2008, 01:57 PM   #3
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my girl is buying me a s2k for xmas so what you are saying a I can make 400whp safely with just a headgasket. what about injector size and anything else I might need
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Old 05-21-2008, 02:31 PM   #4
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my girl is buying me a s2k for xmas so what you are saying a I can make 400whp safely with just a headgasket. what about injector size and anything else I might need
Depends on set-up. Going NA wont get you those numbers. So if you fo FI (Super or Turbo) you will want to throw on some 450 - 550 cc injectors or you will starve the motor of its much needed "gasolina". Otherwise with IHE, a valve job, port & polish and some other minor work on an NA motor the most you will probally get is 300 @ the wheels. And that is with great tuning as well...

Hope that helps....
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Old 05-21-2008, 02:33 PM   #5
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Originally Posted by TheCarGuy2021 View Post
It's not a matter of psi that limits these engines, but power. Generally ~500 is the safe mark with a head gasket, some say 600. It all depends on the tune. There are many in the high 400's, even in the 500's with stock transmissions without problems.
Maybe a stock tranny but not a stock clutch. Stock S2000's are known for clutch fade with numbers that high.
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Old 05-21-2008, 04:33 PM   #6
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I was gonna go with the inline pro kit so I would need to also get a headgasket and injectors to safely be able to have a 400whp weekend car
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Old 05-21-2008, 10:27 PM   #7
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Originally Posted by dezignpro04 View Post
Depends on set-up. Going NA wont get you those numbers. So if you fo FI (Super or Turbo) you will want to throw on some 450 - 550 cc injectors or you will starve the motor of its much needed "gasolina". Otherwise with IHE, a valve job, port & polish and some other minor work on an NA motor the most you will probally get is 300 @ the wheels. And that is with great tuning as well...

Hope that helps....
Shooting for 400whp will require a lot larger injectors than that. I'm running 875cc injectors for 450whp.

I/H/E, valve job, port&polish and other minor work will not net you 300whp.

Obviously the clutch will need to be changed, my OEM clutch slipped at 300whp when I used to be supercharged.

Plan to spend a lot more than anticipated to make this car into a reliable turbo car.

Here is my setup engine wise +- whatever I forgot.
Garrett GT3582R
Custom Lovefab GT1 tubular manifold
AEM 1052 EMS
InlinePro 3mm head gasket
Lovefab 4" down pipe
3" test pipe
Custom 3" single catback
Custom intercooler plumbing
Boost logic turbo blanket and a lot of other insulation products
Precision 600 intercooler
ARP head studs
Comptech reinforced differential with Puddymod solid steel sleeve
Exedy hyper single 6 puck clutch
AEM boost control solenoid
Tial 44mm wastegate
Apex'i race blow off valve
Science of Speed 70mm throttle body
Walbro 255 fuel pump
AEM fuel pressure regulator
Siemens 875cc injectors
Krank vents
Buddy club SECU turbo timer
AEM UEGO wideband
AEM tru boost
AEM Oil press
AEM 3.5 bar map sensor
InlinePro oil filter relocation
Auto meter fuel rail mounted fuel pressure gauge
Anodized blue powdercoated valve cover
Anodized blue fuel rail cover
Optima yellowtop battery
ARC gradiation spark plug cover
NGK 7173s
Updated banjo bolts
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Old 05-22-2008, 10:58 AM   #8
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thanks for the info I was not wanting to open have to do internals like rods and pistons this is just gonnna be a weekend car.
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Old 05-22-2008, 01:13 PM   #9
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Aftermarket pistons are not compatible with our OEM sleeves anyway. We have fiber reinforced cylinder liners, aftermarket pistons will chew them up. In order to swap internals you must re sleeve the block. We do have forged internals from the factory, and with lower compression, they can take a beating.
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Old 05-22-2008, 01:38 PM   #10
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yeah I was gonna get the inline pro 3mm headgasket along with a upgraded pump and probly 750 injetors when I order the kit from what I read that should be enough to handle the 400 I would like to get a least
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Old 09-22-2008, 07:15 PM   #11
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going turbo will be the best way to get 400hp.. but that also comes with a good tune... there are three things to consider when going turbo... FAST, RELIABLE, AND CHEAP, you cant have all three when it comes to turbo.. you have to pick two... fast and cheap wont be reliable, reliable and cheap wont get you fast either.. unless good deals come along.. just be cautious when you buy parts and make sure they are not knockoff parts either..
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Old 09-26-2008, 12:29 AM   #12
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that the best saying iv heard
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Old 10-20-2008, 09:42 PM   #13
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Originally Posted by sk2boosted View Post
going turbo will be the best way to get 400hp.. but that also comes with a good tune... there are three things to consider when going turbo... FAST, RELIABLE, AND CHEAP, you cant have all three when it comes to turbo.. you have to pick two... fast and cheap wont be reliable, reliable and cheap wont get you fast either.. unless good deals come along.. just be cautious when you buy parts and make sure they are not knockoff parts either..
that is so true
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Old 10-22-2008, 01:29 PM   #14
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100k Engine

My 2001 is soon to roll 100k miles, and i was wanting to get a Kraftwerks supercharger for it, when the kit becomes available. I would much rather just get the kit and do the work than pull the engine and do internal work. The engine seems to be in great shape as far as compression tests, etc. Do you guys think its a good idea to run 10psi, 360whp on the f20 with over 100k miles? Personally, it scares the sh** out of me...I dont want a bigger problem in the end.
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Old 02-05-2009, 11:08 PM   #15
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Throw a 3mm headgasket on there and you'll be more than fine.
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Old 02-23-2009, 05:52 PM   #16
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I think people trying to make this much power should be more concerned with tranny and differential life than engine longevity
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Old 02-23-2009, 06:51 PM   #17
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There's plenty of high hp s2000's with no tranny and diff problems
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Old 10-18-2011, 04:06 PM   #18
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hey guys!! im having problems with either my clutch or something in the tranny. it will not go into 6th gear on my 2001 s2k and when i do manage to get it in..it gets stuck and requires me to punch it out...almost feeling as if i may break the shift fork.. any input would really help before i start tearing into this and spend money at a shop. sometimes it feels like the shifter gets moved around a couple millimeters or so..and when im driving..it vibrates around more than the usual stick shifter would.

thanks fellas
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Old 10-18-2011, 04:15 PM   #19
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Im going in the reverse of all of this. I plan to upgrade the trans, diff, and brakes next year.... 2013.... supercharge. Why does everyone see the WOAH... before the SLOW.
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Old 11-20-2011, 07:28 PM   #20
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Im going in the reverse of all of this. I plan to upgrade the trans, diff, and brakes next year.... 2013.... supercharge. Why does everyone see the WOAH... before the SLOW.
most people don't see the point in upgrading the trans or diff before they have the power to easily break the stock parts

I want an upgraded diff/tranny, but I haven't had any problems with the stock units in 25k+ miles of ~450whp
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Old 01-08-2012, 11:44 AM   #21
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I think there are so many variables to that question there is no one correct answer. Personally I think the biggest factor is the driver and tune. If you dont beat on the car and have a good safe tune on the car I dont see tehre being any issue of haveing 500,600,+ whp with a good clutch of course. But I have seen blown up motors and trannys at stock power. So it all comes down to you and how you drive
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Old 01-11-2012, 09:16 PM   #22
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I just blew my tranny tonight second gear is gone ,im running 550 hp ,really sucks , not sure if i want to install a used tranny and turn the boost down so im about 400 hp, I did it on a 2nd gear pull around 4000 rpms , any suggestions?
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Old 07-10-2012, 04:12 PM   #23
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Definitely all depends on the tune. Detonation is your enemy...and a bad tune (no matter the psi or turbo size) will cause that.

Assuming a good tune though, the magic mark seems to be around 400-500 (500 is fairly risky though). Anything above 500 and the next major issues are the diff,axels, and trans.

So keep it in the 400 range and get a good tune.
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Old 09-15-2017, 07:23 PM   #24
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so what do you guys suggest for a tranny,axles,driveshaft,diff that can withstand 800+ whp?
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Old 09-24-2017, 05:18 PM   #25
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so what do you guys suggest for a tranny,axles,driveshaft,diff that can withstand 800+ whp?
A different car...
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Old 09-24-2017, 05:53 PM   #26
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I like that answer

Last edited by Glenn1; 09-24-2017 at 05:57 PM.
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