My mod list (built 2.5), need opinions.
01-12-2003, 08:10 PM
#31
Registered User
Join Date: Nov 2002
Location: Pennsylvania
Posts: 70
Car Info: 1998 Subaru RS 2.5 (soon to be N/A beast)
One Step Ahead
I definitely have thought about taking off too much weight. It could be a problem, but only because the stock computer starts to get all screwy. I am running a lightweight flywheel but not a lightweight pulley set. If you balance the pistons, rod ends and crank when you lighten everything, you shouldn't have a problem, but most people aren't lucky enough to have access to the machines do that.(unlike me, hahahaha) I am working with one of my professors who holds over 20 world titles for the engines he builds and he and I were discussing the pros and cons to doing all that. I am not doing it right this moment, but I will be doing it come next fall when I build my crazy higher compression balanced/blueprinted/lightened block. At that point I'll be at a fully driver controlled stand alone engine management system.
Anyway, before I got off on my tangent (again), you are right. Lightening everything is definitely going to have adverse effects on overall engine balance, as well as completely screwing with the stock ECU.
Anyway, before I got off on my tangent (again), you are right. Lightening everything is definitely going to have adverse effects on overall engine balance, as well as completely screwing with the stock ECU.
01-12-2003, 10:51 PM
#32
NASIOC Slut
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Join Date: Nov 2002
Location: Roseville, CA
Posts: 4,723
Car Info: 1995 Subaru Impreza 1.8 L
Boxer engines are inherantly ballanced. They dont need "ballancers" and other devices that Inline and V-series engines require. You can lighten the pulleys and flywheel at will, although I wouldnt go much under 13lbs for a flywheel anyway.
01-16-2003, 07:45 AM
#33
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Posts: n/a
Tttoocollector, id would love to take a look around the machine shop where you are doing the work, but Im pretty far away! M
My block is at lachute subaru for a few picture for their website and they said it shuld be done by the end of the month, the only think Im scared about is tuning and making sure the 8,000 redline wont be too much for the engine.
Im found domeone who can do individual throttle bodies, just like you were talking about, but its a n expensive job to do, you know how much it costs when they finish it. But I do have two throttle bodies andd the correct sizes for the velocity stacks for the custom intake mnaifold my brother and I are making, but that will be a bit longet to finish.
I asked about crank walk, and lightening it too much, and I wasnt cautioned too much about it. Could someone elaborate on crank walk for me? Id like to know a little more about it. Thaks everyone for the replies.
Dan
My block is at lachute subaru for a few picture for their website and they said it shuld be done by the end of the month, the only think Im scared about is tuning and making sure the 8,000 redline wont be too much for the engine.
Im found domeone who can do individual throttle bodies, just like you were talking about, but its a n expensive job to do, you know how much it costs when they finish it. But I do have two throttle bodies andd the correct sizes for the velocity stacks for the custom intake mnaifold my brother and I are making, but that will be a bit longet to finish.
I asked about crank walk, and lightening it too much, and I wasnt cautioned too much about it. Could someone elaborate on crank walk for me? Id like to know a little more about it. Thaks everyone for the replies.
Dan
01-16-2003, 11:51 AM
#34
Registered User
Join Date: Nov 2002
Location: Pennsylvania
Posts: 70
Car Info: 1998 Subaru RS 2.5 (soon to be N/A beast)
Crank Walk
Hi Dan. The shop that I am working in is not that impressive at all. You would be more than welcome to come down and sit in on a class of mine. The professors would not mind at all. I have them on Thursday nights. As far as the other shop, I am not really doing much there. If I run into any problems at the school, I will be doing the other stuff down at the other shop. The other shop that my professor owns (where he builds the Panos, Trans-Am, etc engines) is not all that impressive right now because he has been busy and working a lot. However, when I went down there the last time, there was a few Winston Cup motors, an experimental fuel injected Ford 460, a few Cobra R motors for some race team, an crazy engine dyno, etc, etc. So, even though it was messy, it was still quite impressive.
To address crank walk, i think they're talking about how much end play the crank has. The thrust bearing controls that. I forget which one it is but one of the main bearings has a part on it that keeps the crank from moving forward and backward. So, basically, crank walk is how much the crank moves towards the front and back of the car in the block. As far as lightening up the crank gear, the stock one is a harmonic balancer. It provides balance to the bottom half. On an V style engine, if you lighten that up too much, you can throw off the balance of the engine, whereas a horizontally opposed engine is naturally balanced provided that the piston and rod weights are relatively close.
I think that I've addressed everything.
As far as the throttle bodies, I can't do it yet. I have to wait until I go to a full stand alone system.
Oh, I also called Ben yesterday and talked to him for a little while. I am going to get a Unichip from him. Those guys are super cool and they really know what they're talking about. I'll pay the extra it costs just to buy it through them.
Gotta run.
nathan
To address crank walk, i think they're talking about how much end play the crank has. The thrust bearing controls that. I forget which one it is but one of the main bearings has a part on it that keeps the crank from moving forward and backward. So, basically, crank walk is how much the crank moves towards the front and back of the car in the block. As far as lightening up the crank gear, the stock one is a harmonic balancer. It provides balance to the bottom half. On an V style engine, if you lighten that up too much, you can throw off the balance of the engine, whereas a horizontally opposed engine is naturally balanced provided that the piston and rod weights are relatively close.
I think that I've addressed everything.
As far as the throttle bodies, I can't do it yet. I have to wait until I go to a full stand alone system.
Oh, I also called Ben yesterday and talked to him for a little while. I am going to get a Unichip from him. Those guys are super cool and they really know what they're talking about. I'll pay the extra it costs just to buy it through them.
Gotta run.
nathan
01-16-2003, 08:48 PM
#35
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Posts: n/a
Cool man, but I have a bunch of courses this term (university psychology) and I will only be free around april when we finish.
Im in no rush for the itb's, Im making the one with my brother for now, so that'll keep me busy.
Thanks for clueing me in on crank walk, it make sense now! I guess i woun have any problems, they have a few cars with 9lb flywheels onema nd no problems.
Yeah, Ben is who I do everything through at Lachute, he is really cool and easy going and a master with the Unichip. I buy everything through them, and ill never go anywhere else for sure, they dont jerk you around and they get your parts quickly.
By the way, they are taking pictures of my car and its engine and putting it on the website (actually its already on there, its now being updated with more pics and my mods). They are taking pics of the block right now, im not sre when they will be up. But heres the older one's. if the link dosent bring you there: From the main page, click "products" at the top then in smaller print "out of our shop" which is in the bottom left corner. Im the last car down, black 01 RS.
http://lachutesubaru.com/
Later!
Dan
Im in no rush for the itb's, Im making the one with my brother for now, so that'll keep me busy.
Thanks for clueing me in on crank walk, it make sense now! I guess i woun have any problems, they have a few cars with 9lb flywheels onema nd no problems.
Yeah, Ben is who I do everything through at Lachute, he is really cool and easy going and a master with the Unichip. I buy everything through them, and ill never go anywhere else for sure, they dont jerk you around and they get your parts quickly.
By the way, they are taking pictures of my car and its engine and putting it on the website (actually its already on there, its now being updated with more pics and my mods). They are taking pics of the block right now, im not sre when they will be up. But heres the older one's. if the link dosent bring you there: From the main page, click "products" at the top then in smaller print "out of our shop" which is in the bottom left corner. Im the last car down, black 01 RS.
http://lachutesubaru.com/
Later!
Dan
01-20-2003, 11:17 AM
#36
Registered User
Join Date: Jan 2003
Location: Andover, MA
Posts: 137
Car Info: fastar
PROPS DUDE
hey man i give u crazy respect for this, i'm all about N/A, nothing against turbos but i wana try to squeeze as much power out of it before i turbo. i love the idea of a Naturally Aspirated street monster. i've been planning on getting an rs and rebuilding the engine with COBB block, cyl heads and power package. i like the cobb route cuz they make sure not to lose that o so loved low end but your set up sounds sick. you should start a naturally aspirated thread, get ppl to post hp/torque, 1/4's, etc.... good luck with the car man!
01-21-2003, 08:04 AM
#37
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Posts: n/a
RSEnigma,
Thanks, theres very few people who really like the idea of fully n/a out there, so I love getting support instead of all the reasons I should have turbocharged it. I will post 1/4 mile times as soon as the trackes up here open, then we will see if it was worth all my time and effort to do this!
Dan
Thanks, theres very few people who really like the idea of fully n/a out there, so I love getting support instead of all the reasons I should have turbocharged it. I will post 1/4 mile times as soon as the trackes up here open, then we will see if it was worth all my time and effort to do this!
Dan
01-21-2003, 11:22 AM
#39
Guest
Posts: n/a
My prayers were answered for a lighter hood! A block of snow/ice fell off the top of the roof of my g/f's college when i was picking her up and landed right on my hood (I was in the car, big bang!) and it made a small dent in my hood and one on the fender (really small). I am asking them to pay 561$ (dealer quote) to fix the damages, but ill use the money for a new c/f or aluminum hood.
Are there any well priced ones out there/ I was considering a lancer style hood as I hear they are great for venting out hot engine bay air in either aluminum or c/f, but I dont want to spend more than the money the college is giving me for the damages. Im not sure whet other lightening mods to look into, maybe lightend beams (front rear) but Im not sure whgat else for mow, i need a little reserve $ for tuning incase it takes extra long to do. I will look nto it though. Thanks!
Dan
Are there any well priced ones out there/ I was considering a lancer style hood as I hear they are great for venting out hot engine bay air in either aluminum or c/f, but I dont want to spend more than the money the college is giving me for the damages. Im not sure whet other lightening mods to look into, maybe lightend beams (front rear) but Im not sure whgat else for mow, i need a little reserve $ for tuning incase it takes extra long to do. I will look nto it though. Thanks!
Dan
01-21-2003, 11:28 AM
#40
Registered User
Join Date: Jan 2003
Location: Andover, MA
Posts: 137
Car Info: fastar
dude u should check out http://www.aerosim-research.com they hav a cf hood with some really sweet vents where the stock ones should b, ask them for a quote. their cf stuff as far as i've heard from stever is well priced. good luck with the hood!
01-22-2003, 02:28 AM
#42
NASIOC Slut
iTrader: (2)
Join Date: Nov 2002
Location: Roseville, CA
Posts: 4,723
Car Info: 1995 Subaru Impreza 1.8 L
Note: I just read that the AVCS for the STI is tunable... This makes me wonder how much power the AVCS N/A EJ25's would make when the Variable valve timing is tuned, combined with all the other good engine mods (minus cams/heads of course, since that is what makes the AVCS is part of)
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