I considering putting the ZEX kit on my STi. I have been getting mixed opinions about how the engine will hold. Im running stock ecu but i have the cobb access port on order. What do you think?

No chance! Take it from someone who is replacing all of the internals with forged parts and a sleeved block.

Originally posted by silverstipa
No chance! Take it from someone who is replacing all of the internals with forged parts and a sleeved block.

Werd

Properly tuned, and used, yes the engine will hold on a 55 shot, but it won't tolerate any silly mistakes.

The transmission is an issue if you spray on launch so be careful.

A couple people have run 50+ shots and kept the engine alive, but they knew what they were doing.

At around 75+ the tranny becomes a big issue, and a 100 shot on launch will nuke low gear. In the 75 shot range, the engine gets to be an issue, and several folks that have run at that level, lost engines after only a few bottles.

A 50 shot or there abouts seems to be the smart choice for frequent usage.

Larry

Originally posted by hotrod
Properly tuned, and used, yes the engine will hold on a 55 shot, but it won't tolerate any silly mistakes.

The transmission is an issue if you spray on launch so be careful.

A couple people have run 50+ shots and kept the engine alive, but they knew what they were doing.

At around 75+ the tranny becomes a big issue, and a 100 shot on launch will nuke low gear.

Larry

Are you are speaking of the 6 speed STi transmission or the WRX 5 speed?

That is on the 5MT. Folks who have been good to the tranny, (and some would say lucky) have gotten away with brief excursions in the 50+ Nitrous range. The 100 shot I mentioned was on a 5MT.

Larry

The 6-speed is a better tranny, the 2.5 turbo has a closed deck, so I don't see why an STi wouldn't hold up with a 50 shot. Why would spray from a launch anyway, you have AWD to get you out the hole? This is just my uneducated opinion, I don't like nitrous anyway. But spraying on anything below 60 mph is hard on non-forged internals.

silverstipa: Were you spraying out of the hole? Since you have an Sti and experience with nitrous I find you a more credible source.

-Charles-

Originally posted by ImprezaVA
silverstipa: Were you spraying out of the hole? Since you have an Sti and experience with nitrous I find you a more credible source.

-Charles-

Did not mean to imply that I was running nitrous. The motor broke 2 pistons at only 300whp @ 13psi on a GT30R turbo. I have tried to post the picture of the piston in the correct thread w/ no luck.

Originally posted by ImprezaVA
The 6-speed is a better tranny, the 2.5 turbo has a closed deck, so I don't see why an STi wouldn't hold up with a 50 shot. Why would spray from a launch anyway, you have AWD to get you out the hole? This is just my uneducated opinion, I don't like nitrous anyway. But spraying on anything below 60 mph is hard on non-forged internals.


STi's have a semi-closed deck, and it’s not that impressive. The stock cylinder sleeve liners aren’t anything to brag about either. I would be hesitant to run nitrous.

-Mike

thanks for the input guys. I think i will allocate the NOS funds elsewhere. I do agree now that it will hold it but, i think i'll wait till i have more miles on the car.

Originally posted by silverstipa
Did not mean to imply that I was running nitrous. The motor broke 2 pistons at only 300whp @ 13psi on a GT30R turbo. I have tried to post the picture of the piston in the correct thread w/ no luck.

you should make subaru cover it. if you had forged pistons like media.subaru.com says you do, it wouldnt have happened.

silverstipa: I was under the impression that you were running nitrous? Sorry about your luck. I've heard that STi's are cranky when fooling around with the boost.

-Charles-

try it out....
just make sure you run video for us though....

check out the pic of my piston. You might change your mind

http://forums.nasioc.com/forums/showthread.php?s=&postid=5885578#post5885578

It can take up to about 100 shot of NOS. however, you'd better have EGT, boost gauges and a UTEC or similar device. There needs to be special maps for NOS so that you dont **** up your car. If you just put in a 55 with nothing else, you will explode. WEEE:banana:

Block will hold it.. Thats not even a question. What will cause a failure is lack of tuning. I ran 50 and 70 shots on my EJ205 engine many times. About 10 bottles worth. Enough Octane and the solid tuning is the key.

Clark

NITROUS IS KING :disco: . I ran at least 25 bottles @ 75 shot of wet laughing gas into my 02 wrx. Never had a problem. My tranny was fine, clutch was getting worn though. I used 2 range colder plugs and vp racing fuel. Detination is what's goint to kill the engine, not the power created by nitrous+boost.
mods:
nitrous express 75 shot wet $500
waste-gate actuator t-tap @16 psi $0.50
supra tt fuel pump, oem reliability $180
aem cai,loved that intake sound $200
dp-back no-muffler 2.5" exhaust $100 at local muffler shop

equals

12.5, I think at about 115

I was king at illegals, mostly 1/8 mile kind of races. I don't do that kind of thing anymore. At the track I beat vipers a couple times, they'd get spooked and real squirly after seeing my crazy launches, 1.3 60 foots with .5 reaction if I remember correcly. That car was really fun, but had to move onto a 350z, the chicks go wet over that thing. 350z on stock 18" tires = bad 60 foot. First mod is going to be 26" et streets on 17" rims, should get me 13.7 or so with all other stuff stock.

thinking about buying an sti and doing the same mods, except turbo-back exhaust from obx, 490 shipped on ebay. I'm all about cost versus functionality, I would give up 1 or 2 hp for half the price. I don't know of anyone who ran my kind of times for a grand.

1.3 60 ft? Please. 115 trap? Please.

C

1.3 60 ft? Please. 115 trap? Please.

C
:lol:

Why not spend the money on something that will give you permanent HP and probably not even require tuning? Hell why not just get some tuning? or is it for the BLING factor....?

I'm gonna say yes, and once again there is tons of info here that you dont need to read because it is unrelated to running NOS thru an STi, but hey... it happens.

I would be willing to bet quite a bit that an STi with a correctly installed and used NOS kit will last for a LONG time if not forever.

Much like guns, NOS doesnt kill things... people do.

~v6

I agree V6. An NOS kit is an inanimate object. It will not do anything and it will not blow your motor. If you blow your motor with nitrous you are an idiot and or a fool or maybe you dont care and tried to go to far. I will always use NOS as its a cheap, easy and makes lots of power. I would have no issue at all running a 50-75 shot through an STI.

C

75 shot on an STi... my prediction

low 12's @110+mph

I bet it would do it all day long too.

~v6

I am thinking that with TBE+short ram+Utec+50 shot NOS =high 11's
Just a guess.:lol:

TMS

you should make subaru cover it. if you had forged pistons like media.subaru.com says you do, it wouldnt have happened.

:rolleyes:

Don't be Stupid, Stupid.