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Old 01-03-2014, 08:24 AM   #1
renhoek
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1995 WRX STi LS1

Default My GC8 LS1 build

Just thought I would share a photo of my build so far. Engine is in..

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Old 01-03-2014, 08:37 AM   #2
renhoek
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1995 WRX STi LS1

Default Wrong forum?

Sorry guys. I reckon I out this in the wrong forum... Can I move it?
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Old 01-03-2014, 09:22 AM   #3
Dan7140
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More info stat!
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Old 01-03-2014, 11:36 AM   #4
snake32
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what transmission are you using?
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Old 01-03-2014, 03:06 PM   #5
BLkdubRX
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WAT. <3 this. in for the update
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Old 01-03-2014, 06:06 PM   #6
renhoek
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I am trying to keep this conversion as simple as possible, by using an LS1/T56 drivetrain, mated to an R180 rear end. Not at all sure the rear will hold up, so I have an R200 as a back up, once I figure out how to mate the hubs to the R200 axle ends.

Tricky thing with this build was trying to get the engine as far back as possible to achieve reasonable handling, and I managed to mount it at the original Subie engine mounting point at the cross member, unlike many others I have seen placing the engine further forward.

Anyway, will post some more pics up soon.
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Old 01-03-2014, 06:34 PM   #7
APM Tuned
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that's AWESOME!

Nicely done, it sits nice and low and just like you said, way back there so there's minimal weight slung past the center.

Good job, subbing in for this one!

-Mark
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Old 01-03-2014, 06:40 PM   #8
TyConway
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lets see pics of how its mounted... will the hood close? which oil pan are you running. Also with the engine back that far, how are you running the clutch master cylinder?
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Old 01-04-2014, 08:02 PM   #9
renhoek
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1995 WRX STi LS1

Default Some more pics

General engine position in Engine bay. Enough room for the radiator and intake.

[IMG][/IMG]

Left side sub frame cut



Right side sub frame cut. You can see the new piece of steel supporting the rear of the sub frame that was removed, and supports the steering rack.



Steering rack reposition and protection. Sump clearance - Rear bowl sump.



Left Engine Mount. Right is similar but had heaps more room (RHD) on that side



Steering rod and LCA angles. Dry run on checking bump steer looks good.



The build continues....

cheers
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Old 01-04-2014, 10:05 PM   #10
crazychrisra
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Subscribed! I'm definitely loving the idea. Are you building it for Drifting or as a daily?

Chris
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Old 01-04-2014, 10:22 PM   #11
oldsmobiledriver
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The wife and I are both at the end of our rope with subaru maintenance and repairs, we are both die hard gm fans. My father in law taught her well!!! She asked why you wouldn't just buy a Vette but I slightly defended our cars! I slightly still like my car after my engine replacement and pointless let downs. Subscribed!!!
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Old 01-05-2014, 01:45 AM   #12
TyConway
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So you cut the subframe and dropped the steering rack? Looks like it from what I can see, just some advice, dropping the rack is gonna give you very bad bump steer, the outer tierod spacers won't correct it... If you haven't seen my build thread check it out.
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Old 01-05-2014, 07:11 AM   #13
renhoek
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Love the challenge Ty. I did a rough toe test with suspension at both ends of travel, as well as mid point. Toe changed very little but it's still early days. Haven't even settled on ride height yet. Ackerman looks to be my challenge at the moment... Do you know if the front knuckles on WRX's from say 1996 thru to 2006 were the same in geometry? Particularly looking at the steering arm connection here...

What spring rates you planning to use in yours? I am starting with 10/6 and will go from there.

I did check out your thread and sure looks a nice build. I'm at the other end of the scale; a budget build, but it's gotta work. So far, so good.

Best of luck Ty.

Last edited by renhoek; 01-06-2014 at 01:02 AM.
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Old 01-07-2014, 11:01 AM   #14
Dan7140
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I hope the R-180 holds up, but I doubt it will for long. I love the idea of a torque monster after feeling the differences between a 257 and 20K. I couldn't imagine a lightweight V8 with very low maintenance. Awesome work so far.
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Old 01-07-2014, 05:08 PM   #15
TyConway
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Im running the same setup I had with the sti swap, Tein Mono Flex Coilovers F6 R9, Should be close to the same weight with the V8 swap in it.

But still dropping the steering rack is going to screw the geometry all up. doesn't take much to make it drive like crap. Its like the cradles out there for the v8 swap Rx7's the 2 big name brand ones drop the steering racks, main reason you see so many with V8 rx7's complaining about bump steer problems. They try and band aid the problem with the outer bump steer spacers, which does nothing to correct it. Just wanted to give you fair warning. If you want your ackerman correct you gotta have the rack in the correct location. If not everytime it hits a bump, that wheel will turn in and out.

If you plan on running a bigger rear diff, I'm going to sell my rear R200 cradle
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Old 01-08-2014, 02:44 AM   #16
renhoek
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1995 WRX STi LS1

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Wow. You ran F6 and R9 on your STi? On our race car, I only run a 5 on rear so way different to you, and a 7 on front which is pretty close to yours. Driver handling preferences I suppose.

Just fitted the hood and I am so happy that if fits right on with no spacers or bulges needed. When I finish this thing and it turns up to the track, no one will give it any notice, until we start it up!



Cheers

Last edited by renhoek; 01-27-2014 at 09:43 PM.
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Old 01-12-2014, 06:57 PM   #17
sub9lulu
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i m in love

what headers are you running ?

i would hate messing (dropping) that steering rack location

also are you using a T56 ?

hows the shifter location ?

Last edited by sub9lulu; 01-12-2014 at 11:51 PM.
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Old 01-13-2014, 01:15 AM   #18
renhoek
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I am running "HSV" extractors, which are a rear exit extractor sold on performance Australian GM cars. Yes I am using a T56 with an upgraded "Rip shifter". The shifter location is fine. Will post a picture soon. It is only about 2cm further nack and the Ripshifter lever is angled forward, so all works just fine.

I am in the process of making up a plate that will attach to the wheel hub, so that I can measure actual bump steer across suspension travel. I have looked at it by eye (granted it is NOT the most scientific way), but observed very little in the way of Toe change with suspension travel. But I am waiting for the data before I get too excited.

Man I just LOVE this project. I left the hood on the car just so I don't get too used to seeing that engine in there. Every now and then, I lift the hood and WOW!!!!
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Old 01-13-2014, 01:35 AM   #19
Cbgrandtheftauto
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I always hate to see someone ruin a car by putting a ls in it, but the way you are going about this and the car you are using makes you an exception

Looking forward to the finished product!!
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Old 01-13-2014, 06:49 AM   #20
renhoek
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1995 WRX STi LS1

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Thanks so much for the support. Sometimes projects like this can leave you wondering why the hell you started it in the first place! But you learn so much from a little research and other's experiences, that it is really like a bit of a journey.

My objective is to have this car running within 3 months, and on the track within 6. All do-able and for me, if I do not have realistic objectives like this, the timing could just blow out.

Other thing I am watching is "scope creep". Gotta stick with the basic objectives for me; no frills. Not first up anyway.

Hey Ty, I know you are watching this thread and have a question for you (or anyone else with an opinion, preferably based on real life experience.

When you say that bump steer will be a major issue for me, and builds like it, could you quantify what you consider a big deal? I fully realise that zero is where you want to be, but not sure they even come out that good stock! Anyway, how much toe change roughly per inch suspension travel do you believ renders the car useless? Just wondering...

I will measure mine very soon and compare it to our current STi race car, just for interest.

Cheers
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Old 01-13-2014, 11:57 AM   #21
69subaru360
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Is bump steer even going to be an issue on a car that low and stiffly sprung? There isn't going to be a whole lot of suspension travel anyway.
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Old 01-13-2014, 03:57 PM   #22
renhoek
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1995 WRX STi LS1

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Very true. I am using 10's in the front and 7's at the back. Never tried this combo before and Car is still up on stands, so don't even know the static sag figure yet (with zero preload). I am expecting around 20mm at zero preload.

Will also check rear bump steer.
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Old 01-14-2014, 11:58 AM   #23
TyConway
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Quote:
Originally Posted by 69subaru360 View Post
Is bump steer even going to be an issue on a car that low and stiffly sprung? There isn't going to be a whole lot of suspension travel anyway.

True I thought the same thing, it doesn't take much to make a car pull sideways down the road.

I had a 93 rx7 with a ls1 swap, and the cradles out for them dropped the steering rack, changing the geometry and they bump steer pretty bad. hit a little bump and would make it pull. It was enough to feel annoying on the road and scary at a 120mph passes at the track. But that was the main reason I sold my rx7 after a few months of having it built. Again this is a macpherson strut design so its a little more forgiving on the subaru.
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Old 01-14-2014, 12:10 PM   #24
TyConway
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Quote:
Originally Posted by renhoek View Post
Thanks so much for the support. Sometimes projects like this can leave you wondering why the hell you started it in the first place! But you learn so much from a little research and other's experiences, that it is really like a bit of a journey.

My objective is to have this car running within 3 months, and on the track within 6. All do-able and for me, if I do not have realistic objectives like this, the timing could just blow out.

Other thing I am watching is "scope creep". Gotta stick with the basic objectives for me; no frills. Not first up anyway.

Hey Ty, I know you are watching this thread and have a question for you (or anyone else with an opinion, preferably based on real life experience.

When you say that bump steer will be a major issue for me, and builds like it, could you quantify what you consider a big deal? I fully realise that zero is where you want to be, but not sure they even come out that good stock! Anyway, how much toe change roughly per inch suspension travel do you believ renders the car useless? Just wondering...

I will measure mine very soon and compare it to our current STi race car, just for interest.

Cheers
Well it really depends on how your alignment guy sets it up, toed in a little or out, or neutral, all will affect on how it changes when it moves up and down.

Steering response will be improved with toe-out.
Straight line stability will be improved with toe-in.

Street cars often are set up with toe-in, For good straight-line stability cornering is sacrificed.
Race cars are often set up with toe-out, Straight-line stability is sacrificed for good cornering.


So it really comes down to how its set at ride height to what its going to do. But like said before, the suspension being stiff its not going to move much, but when it does, how drastic of a change? Just keep us updated when you get it on the road.

Like my car will be set up for street driving and drag racing... Never will see a autocross track or drift course.
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Old 01-15-2014, 05:53 AM   #25
renhoek
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1995 WRX STi LS1

Default Bump steer update

Well, I have spent the last couple of days adjusting front end settings (coil over height, different static sags, all low spring preload, LCA std and 20mm extended ball joints), and have a setting I believe will be good to drive on as a start. Here is a pic of my ghetto bump steer measurer...



Results are below. Comments welcome,,,



Sub9lulu, here is the shot of the shift position you were wondering about...



So all good so far. Now working on getting the fuel system sorted, finishing the wiring and then start her up.

Last edited by renhoek; 01-27-2014 at 09:48 PM. Reason: Fixed the picture links
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