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Old 11-02-2001, 08:25 PM   #1
Scooby South
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Default Redline.....

Whats a good redline to have if your motor is totally built....with all the fixin's...I am getting cams done and need a realistic redline instead of the 6200 stock...I will be using a Autronic Engine management system.
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Last edited by Scooby South; 11-03-2001 at 09:58 AM.
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Old 11-02-2001, 11:50 PM   #2
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I would think that if you called Cobb Tuning or some other company that deals with such matters, they could tell you something you'd like to hear.

Nick C.
Jus trying to be helpful.
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Old 11-02-2001, 11:54 PM   #3
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You should be more clear on what you mean by built. The limiting factor for high RPMs is mostly the valvetrain, so are you planning on upgraded valve springs and titanium retainers? Is this going to be a turbo motor?


Ben
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Old 11-03-2001, 07:11 AM   #4
Scooby South
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Bsqaure....Yes and Yes....Its a 2.5 ltr block, 9.0 compression, Knifedeged and balanced crank,
JE pistons and Rods, Oil squirters, Cobb turbo Cams, Cobb stage 2 Turbo heads, the plan calls for Extrude honed intake, Bored throttle body, 550 injectors, Billet Rails, T3/T4 Ballbearing-58 trim
2.25 uppipe, 3 in downpipe, Tial wastegate, Front mounted intercooler, and Autronic Engine management...So since the heads are being done..I need to let Cobb know what tension valve springs and what grind of cams I want for the my redline...just can't figure out what redline I want.......Thanks
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Old 11-03-2001, 09:31 AM   #5
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With all that work, I'd move the redline to around 7500. Especially on a 2.5.. A high powered turbo 2.5 at 7500 is going to be a complete animal!

Despite the 550cc injectors, I'd predict that you run out of fuel.. for the kind of buildup that you're doing, you might need something more along the lines of 720's, or even 850's! Hell, I've got 660's going into my STi V, and you've got more displacement and headwork on top of that!

BTW.. what made you decide on an Autronic? I'm still trying to decide on an ECU for my project. Was going to go with a tec 2 due to the number of subaru people using them, but apparently Shiv doesn't need my money..
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Old 11-03-2001, 09:54 AM   #6
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The buildup will be done but conservative on tuning and HP til the STi6 spd is made available...
I plan to run about 300 hp...So 550's should do me fine...then when the 6 spd is in...I will consider bumping it up...
Autronic...Why???/...Bang for the Buck.. read about it
HERE more features and less money...I like...
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Old 11-03-2001, 10:32 AM   #7
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Wow.. only 300? With a setup like that, 300 should be easy !
The six speed sounds like a good idea. I would love to put that in my car, but I'm too impatient to wait for the price to drop to more "reasonable" levels..
The autronic sounds like a sweet deal. Autotune available, and the ability to hook it up to the Motec digital dash.. Mmm..
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Old 11-03-2001, 03:56 PM   #8
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Uh, 300hp? Why bother with a built motor for that? Shiv has Project Impreza putting that much TO THE WHEELS on stock internals and stopped because he was running out of injector capacity. Got money burning a hole in your pocket for what?


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Old 11-05-2001, 05:13 AM   #9
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hahha my budget ass has something like 280 at the wheels if not 300... why not just put in bigger injectors and go crazy.... what is that a 11 sec car..
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Old 11-05-2001, 11:47 AM   #10
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bsquare - when did shiv dyno the car at 300 at the wheels?
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Old 11-05-2001, 05:52 PM   #11
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I thought he did it in SCC converting it to FWD.... I think he did more than 300
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Old 11-05-2001, 06:15 PM   #12
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Actually, it was 297whp on a dynojet. Peak hp at just ~5800rpm. Couldn't get real race gas so I had to settle for a 96 octane mix of unleaded pump (from a local 76 statation). Ran out of injector capacity in the end. With real 110 octane race gas, the mixture could have been leaned out significantly and would probably have made another 10-20whp. The graphs were printed in SCC a couple months back.

cheers,
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Old 11-05-2001, 06:19 PM   #13
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I think he's aiming for 300hp to be conservative. It'll be a very reliable and fast motor correct? 300hp I believe makes for a very fast daily driven street car already, and of course he can always bump up the boost correct?
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Old 11-05-2001, 06:47 PM   #14
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Ding..Ding..Ding..Keiho wins..
espesially the tranny situation....I want the STi 6spd...that way I can bump it up if nessesary...But 300 daily driven horsepower...will be nice..I am building it for Bullet proof horsepower with reliability...Some may argue that with all the work that I am going to do...is overkill...Well it probably is, but I have had one blown motor and don't want another..AND I always have the option of going bigger (track, Etc...) if needed. Maybe I am spending way to much money...but I tell you what...I will be able to sleep well knowing the drivetrain is Sound......and I can stomp most cars with it..hehehehe..

Aloooooooha
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Old 11-05-2001, 07:08 PM   #15
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Is there any evidence that the 6 speed is THAT much stronger? Specifically, has it been put on a high horsepower, high torque car and thrashed? The stock STi 7 doesn't count as it has pathetic torque compared to a turbo EJ25.


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Old 11-06-2001, 12:00 AM   #16
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The 6 speed is stronger than our 5 speed, but a good reason to stick with the 5 is price and well there are alot of different options as far as dog gears go, which the 6 speed doesnt have.
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Old 11-06-2001, 04:25 AM   #17
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Quote:
Originally posted by Keiho
I think he's aiming for 300hp to be conservative. It'll be a very reliable and fast motor correct? 300hp I believe makes for a very fast daily driven street car already, and of course he can always bump up the boost correct?
well not if you use the 550 injectors... but yes... reliable I totally agree with doing it right.
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Old 11-06-2001, 04:26 AM   #18
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Quote:
Originally posted by Scooby South
Ding..Ding..Ding..Keiho wins..
espesially the tranny situation....I want the STi 6spd...that way I can bump it up if nessesary...But 300 daily driven horsepower...will be nice..I am building it for Bullet proof horsepower with reliability...Some may argue that with all the work that I am going to do...is overkill...Well it probably is, but I have had one blown motor and don't want another..AND I always have the option of going bigger (track, Etc...) if needed. Maybe I am spending way to much money...but I tell you what...I will be able to sleep well knowing the drivetrain is Sound......and I can stomp most cars with it..hehehehe..

Aloooooooha
Scooby South
I want to get the 6 speed too... i don't care if its stronger or not... its just awesome... hehehe
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Old 11-06-2001, 05:02 AM   #19
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Dunno bout you guys....but I think a blown tranny is cheaper to fix than a blown motor.

I'd rather have a bulletproof motor and baby the tranny than have a solid tranny but have to constantly worry about the engine.

In any way, I'd say 7500 or 8000rpm sounds cool. Not that my opinion is reached from any scientific studies or personal experience..just that I think it'll be cool to have an EJ25 rev that high.
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Old 11-06-2001, 05:21 AM   #20
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actually yunno keiho... i think they are about the same (in our case)... well not as much as you'd think.... a blown motor you can replace the block.... like i did.. 5000 cdn...

I was asking the dealer about putting in some gearsets and they said it would take longer than an engine swap... because they have to machine the bell housing, assemble blah blah blah...

I hate this mod crap sometimes... pay as you go... and then you get tickets for speeding...:monkey:
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Old 11-06-2001, 07:07 AM   #21
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Quote:
Originally posted by HOK
and then you get tickets for speeding...:monkey:
How can you get a ticket out on the track?
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Old 11-06-2001, 11:35 PM   #22
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Quote:
How can you get a ticket out on the track?
I'm not a trailer queen, sometimes my foot gets a little heavy, so the risk of tickets is constant.

Nick C.
No grandma in this car!
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Old 11-07-2001, 06:44 AM   #23
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don't even laugh about speeding at the track... when i was drag racing they kicked me out that night for speeding in the return track... they said i was going 50 and they only allow 30....
I thought they'd just give me a warning... even the marshall didn't know why they kicked me... maybe because i was beating all the fords... hehehehe
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