my only problem, can you help?

[MDLP412]

i got my 07 STi 6 weeks ago from capital land and im loving it, the NUR spec the previous owner put on it is nasty and i would have picked the same exhaust.  My only problem is that when the car is in nuetral with or without the E-brake the car will not rev to the redline, it makes it to about 4.5k and then defuels down to like 2.5 where it will again refuel and make it back to the 4.5k-ish mark when it defuels again. while making full throttle runs in gear down the highway ramps it will run like a beast all the way to the 7k redline. Anyone have any ideas?

[gebby1029]

Sounds like launch control...

[KA_Killuh]

Wait...so you want to rev the car to redline at a standstill?  I see big things in this car's future, like shattered #4 piston ringlands and blown turbos. 

[Kavik]

that makes the "stock other than catback and catted dp" kinda questionable.  It'll be interesting when you fully figure out what's done to the car, might be more than you think  

Anyone know how many EM's out there have a launch control option?  I didn't think it was more than a couple, but I could be wrong.



(I hope your wrong Killuh and that it's just as simple as a few revs to hear the new exhaust and noticed this)

[phong]

OS/Romraider has launch control so I'm sure all the commercial provide that option as well.

Really does sound like launch control...

[deadlydave]

I thought that our cars, from the factory, would not bounce off the hard revlimit, but a lower number with the clutch in?  I don't know why you'd rev in neutral, it's not an auto, just push the clutch in?   

You may have voided any warranty the car had by posting that.

i got my 07 STi 6 weeks ago from capital land and im loving it, the NUR spec the previous owner put on it is nasty and i would have picked the same exhaust.  My only problem is that when the car is in nuetral with or without the E-brake the car will not rev to the redline, it makes it to about 4.5k and then defuels down to like 2.5 where it will again refuel and make it back to the 4.5k-ish mark when it defuels again. while making full throttle runs in gear down the highway ramps it will run like a beast all the way to the 7k redline. Anyone have any ideas?

posteriquote (R)

[Kavik]

eh, shows what I know  

either way though, some tuning has been done to that car....would be worthwhile to try to find out what before attempting further tuning.  Hopefully it's not married to an AccessPort that you don't have



LOL if a warantee is voided by revving over 4k there's something extremely wrong with the design of that car
(i'm not saying it's good on a regular basis, but raise your hand if your car has never hit 4k in nuetral....like, say, revving it from the throttle cable when you're working in the engine bay, trying to find a sound, bleed a radiator, etc, etc...)

[SideshowBob]

Why the hell are you redlining the car in neutral? 

You are gonna pop your tranny then blame subaru, aren't you?

[deadlydave]

eh, shows what I know  
... raise your hand if your car has never hit 4k in nuetral....like, say, revving it from the throttle cable when you're working in the engine bay, trying to find a sound, bleed a radiator, etc, etc...)

07sti is drive-by-wire.     No throttle cable.

[Kavik]

lol it was just an example of times you may rev and not be able to press in the clutch 

[MDLP412]

I found this problem by just revving it up to listen the exhaust that I'm in love with and I noticed that at about 4.5K it wouldn't rev past that point and no, I don't abuse the car so please don't assume that I do... I've babied every car that I've owned ESPECIALY this one. And in my opinion its not launch control because the videos and cars that I've seen with launch control will flutter at about 4.5K not drop down to about 3K during the defuel stage. And if revving a purpose built performance car like an STi will void the warrenty then shame on subaru and it will be the last product I own by them. I don't sit there with my foot floored on the pedal watching the tach sit in the red space... I'm not like that

[SideshowBob]

LoL... you clearly have a strong understanding of engines. It's not good to rev ANY engine to redline with no load, period.

[KA_Killuh]

Maybe JDMRacingSuckcess can chime in here.  I know he is into reving the fawk out of things. 

[MDLP412]

Maybe JDMRacingSuckcess can chime in here.  I know he is into reving the fawk out of things. 

lol, you guys Arn't reading what im saying.  i DO NOT just sit there and rev the shit outta the little motor watching the bright glowing needle bounce around with a goofy awestruck look on my face. And its not that i want to sit there and rev the motor to the redline in neutral its just a fact that i should be able to.

 And About

LoL... you clearly have a strong understanding of engines. It's not good to rev ANY engine to redline with no load, period.

How exactly is revving a motor well past its break-in period with no load bad?  The manufacturer of any motor will set a redline that they deem safe, and more often then not its under estimated. A perfect example is the 5.9 liter diesel engines i have a heavy background in. Just because the company, in this case Cummins, set the redline and defueling to 3.2k RPM and even as low as 2.7k on some years,  why is it that tuned sled pullers and drag racers will spin a 100% STOCK bottom end to past the 4k mark with no problems.
I myself have seen a truck pull 4,242 RPM and over 40PSI of boost, once again on a STOCK bottom end. and these truck are daily drivers. Before i get to off topic with the diesel's, i dont see how in the current world of engine balancing (the Flat 4's being better balanced then other engine layouts), synthetic engine oils with high grades of protection, and underestimated manufacturing numbers to better protect themselves with warrenty issues that cost countless thousands, how revving a motor in nuetral to or near its redline with no load is bad.  If the oil pump cant keep up thats a manufacturer issue that prolly came around from poor testing and trying to take the cheap route.  I've got more but this shit will prolly just get deleted or ppl will loose interest because we are going off topic about crap no one cares about.

I didn't come here to start flaming wars or make anymore enemies then i alrdy have.  I came for a local community of ppl that share a common interest, to make new friends, and chill out when opportunities arise.  I can weld and fab anything i have tools for, and I'm currently looking into buying my own TIG welder and other fabbing tools to expand my abilities here in my own garage.  i would love to fab some shit up for mine/yours/our cars and makes new friends in the process. Maybe i should write that intro in the newbs section so you guys can here me out before you assume I'm another Asshat ricer that thinks if its louder its better.

[phong]

I think the prolonged winter/shitty weather has made this place more surly than usual.  I for one have been at bit snarky lately.  Don't take it personally, you are just receiving a slightly amped version of the typical noob hazing.

[Kavik]

For starters, yes an intro thread helps on small boards like this one.  There are a lot of helpful and knowledgeable members (if you can put up with our sarcasm), but it's hard not to make assumptions under certain circumstances.  You've got to understand a lot of people out there who ask questions like this without listing any details of why their asking are exactly the type who are bouncing off rev limiters at stop lights and trying to launch their cars at 6 grand then, as mentioned, crying about how subaru trannies suck  


But stick around and get this figured out, I think you're right that it shouldn't be cutting fuel and dropping rpm's like that. (Had you stated all that along with the initial post it might have helped with the perceptions, but just take any ass-hattery along the way with a grain of salt)


Oh, and posts here don't get deleted for going off topic.....I think we'd lose half our site content if they did LOL  

[Turbaru]

How many miles?
Sounds like this car may have been tuned for more than an exhaust and shit was removed prior to your purchase/them trading in. I would suggest a retune, its an 07 anyways, or poke around real good or have one of us help you and try to spot anything out of the ordinary as this is your first STI. Check and see if the turbo has been removed, boost controler, check your inlet hose for cracks etc... I wonder if it has stock injectors... this is all speculation though as you say it runs fine otherwise, or just call cap land.
Cheers, welcome and good luck, and pics of the car please sir!

[deadlydave]

How many miles?  Sounds like this car may have been tuned for more than an exhaust and shit was removed prior to your purchase/them trading in. I would suggest a retune, its an 07 anyways, or poke around real good or have one of us help you and try to spot anything out of the ordinary as this is your first STI.

Ah, yea.  I agree wholeheartedly.

The 2-stage rev limiter I mentioned does NOT cause a 1500 RPM fuel-cut-like drop.  *scratches head*  I have not a damn clue. 

[SideshowBob]

Maybe i should write that intro in the newbs section so you guys can here me out before you assume I'm another Asshat ricer that thinks if its louder its better.

Well then sorry I jumped all over you, but it sure read like you were sitting in your driveway revving the car over and over.

How exactly is revving a motor well past its break-in period with no load bad?  The manufacturer of any motor will set a redline that they deem safe, and more often then not its under estimated.

It is awful for a motor to rev it up into the higher rev ranges with no load. I don't care about diesels, that's not what you own and they are usually so over built you could do anything to them. Looking around there is a bunch of mixed crap on the internet about this, but I will continue to believe it's just not a great way to treat and engine, things spinning up so fast and come back down so quickly.

[MDLP412]

okay heres an update. but first off,
Posted by SlideshowBob
"It is awful for a motor to rev it up into the higher rev ranges with no load. I don't care about diesels, that's not what you own and they are usually so over built you could do anything to them. Looking around there is a bunch of mixed crap on the internet about this, but I will continue to believe it's just not a great way to treat and engine, things spinning up so fast and come back down so quickly."

i understand that we are not driving diesels and that the two motors are built with two separate goals in mind but, with that being said the motor in an STi should be overbuilt to an extent to help prevent warranty issues with people who really dont know how to drive, or at least thats what i would expect.  At the bottom of everything i agree with you to a point and would not sit there and rev the shit out of my new toy just so i can see the needle spin around.

on to the update:
Im trying to get some stone cold, legit information for you guys to help, by doing some revving in the driveway after work today the RPM's will go to about 3.5k and then drop a whole lot less then i had previously stated, it only drops by like 50-100rpm's now. It does feel like a cheap launch control so i apologize for the confusion there.  I'm going to assume that the previous owner did have some sort of tune in the car and i have no idea if it is still in the car, i would have to run with a stock STi to be sure i guess.  And i would like to get with an experienced person to look around the engine bay to see if things look normal or not, i know i could pick out small details in a dodge/cummins engine compartment so if anyone wants to do that i would appreciate it, its a good idea. Would capital Land track down the Previous owner for me? be kinda hard for them if it was a repo or something, maybe Fred can chime in here. i would love to find the previous owner and talk to him/her and see if they have spare parts or anything, the intake is stock and the boost control solenoid looks original as well, just from what i can notice anyway. I just wanted to get my ducks in a row before i get a DomTune.

And if anyone wants to chill or chat or has info for me, i range from Cobleskilll-Clifton Park-Ballston Spa-Galway and sometimes Saratoga area prolly at least once a week. Cell number is 466-1647 and the name is Mike

[byroll01]

get my text?

[MDLP412]

just sent one back 

[SideshowBob]

Oooh, finding any info on the PO would help a bunch!

[MDLP412]

Agreed.

[RedRoof2]

Just an off-note.

Some vehicles are designed from the factory with a rev-limit in neutral.  My old saturn wouldn't go above 4.5k in neutral, but revved happily to 7200 fuel cutoff when in gear.

My Mr2 would rev to 8k no matter where the shift lever was.