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Old 03-15-2009, 10:02 PM   #1
EvO KiLLeR 2005
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Default Best Auto-x Setup

Alright I Pulled My Motor And I Need Some Ideas On The Best Setup For Auto-x. My Car Is An 05 Sti And Im Going To Be Running A 20g. I Dont Want To Do Something Too Crazy Just Thinking Of Some Pistons Acl Bearings Arp Headstuds And I Was Thinking Of Just Buying Some Built Heads Because Mine Are Destroyed. What Cams And Pistons Should I Run. Any Help Would Be Appreciated
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Old 03-15-2009, 10:16 PM   #2
Storm
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The "best auto-x" setup hasn't been found yet.

Jay
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Old 03-15-2009, 10:30 PM   #3
305mouse
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So I take it you'll be running in SM since you'll be using the 20g. Suspension, suspension, R-comp tires and suspension. Auto X isn't about HP, you'll need to get the power quickly to the ground, least amount of lag, and be a good driver. I believe most Cams will get you more top end and not really benefit your low end. Do you plan on boring out the block and going with larger pistons or just keeping the same size? Everyone likes the CP pistons. I have read oem rods won't fit correctly with aftermarket pistons. So Forged rods and pistons would be a good start. 3 port boost solenoid with a good tune?
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Old 03-15-2009, 10:51 PM   #4
EvO KiLLeR 2005
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Originally Posted by 305mouse View Post
So I take it you'll be running in SM since you'll be using the 20g. Suspension, suspension, R-comp tires and suspension. Auto X isn't about HP, you'll need to get the power quickly to the ground, least amount of lag, and be a good driver. I believe most Cams will get you more top end and not really benefit your low end. Do you plan on boring out the block and going with larger pistons or just keeping the same size? Everyone likes the CP pistons. I have read oem rods won't fit correctly with aftermarket pistons. So Forged rods and pistons would be a good start. 3 port boost solenoid with a good tune?
I KNOW ITS NOT ABOUT HP THATS WHY I GOT A 20G BUT MY HEADS GOT DESTROYED AND HAD TO PULL THE MOTOR SO I THOUGHT IT MIGHT BE A GOOD IDEA TO REINFORCE THE BOTTOM END WITH JUST SOME PISTONS I DIDNT KNOW IF I WOULD NEED RODS THOUGH. I PLAN ON KEEPING STD BORE NOTHING TOO SERIOUS.
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Old 03-15-2009, 10:56 PM   #5
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I would go with higher compression and possibly a smaller turbo.

Cosworth has 9.2:1 and Arais has some 9.5:1 pistons, CP and JE appear to not have higher comp pistons.

Stock rods are pretty good and there aren't fitment issues with aftermarket pistons as far as I know. I also would save some money and go with oem bolts and headgaskets. It is a good idea to bore out to 100mm for slightly better fit over drop ins.

Are you putting it together yourself? do you have a machine shop? Are you aware of the caps lock button?

Last edited by jamal; 03-15-2009 at 11:04 PM.
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Old 03-16-2009, 12:33 AM   #6
EvO KiLLeR 2005
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Well My Plan Is To Pull The Block Apart Hot Tank It And Send It To A Shop To Put It Back Together. I Really Want To Stear Away From Boring It Out. Yes I Know About My Caps Lock Button
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Old 03-16-2009, 01:57 AM   #7
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Bolt on a small supercharger, shoiuld be perfect for auto-x

Other then that, more displacement or higher compression.
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Old 03-16-2009, 11:27 AM   #8
305mouse
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Smaller turbo, 20g is too laggy. Since you're going standard bore, just use OEM pistons and rods. I would contact Dom at maxwell performance services. He has done tons of tunes and built a lot of engines. He has seen a lot of different set ups. He's in Washington State I believe and I'm sure would build you a nice set of heads for what you're doing. I have a friend who is very competitive in ESP class, took 1st two years in a row. He uses a custom fuel line set up. Using the stock lines you'll get some starvation in one of the cylinders. I would recomend that. What's the rest of your set up? Suspension, EM, tires?
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Old 03-16-2009, 04:57 PM   #9
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I agree with the 20g being laggy for just AX. If you're running a track, perhaps but pylons on a lot is just too tight for that. Get a 18 or 16g and call it a day. Hell, even the OEM td04 isn't bad for what you need.
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Old 03-16-2009, 07:42 PM   #10
hustleshark206
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Quote:
Originally Posted by EvO KiLLeR 2005 View Post
Well My Plan Is To Pull The Block Apart Hot Tank It And Send It To A Shop To Put It Back Together. I Really Want To Stear Away From Boring It Out. Yes I Know About My Caps Lock Button
Forged pistons must be custom fitted by a machine shop. If you don't want to mess with your bore than stay stock. Stock pistons should be plenty for what you are doing anyways.
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Old 03-17-2009, 04:09 AM   #11
GodSquadMandrake
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I would agree with what people have been saying. Drop the 20g, put in a big TD05H 16g. Increase the compression, this will help your low end and turbo lag. Get your headers, crosspipe, intake manifold, intake and exhaust ports gasket matched. Maybe an up-pipe, that'll no doubt help spool time. Maybe some phenolic intake manifold spacers, they increase your intake manifold volume and the length of your runners which adds torque. Then maybe a lightweight crank pulley and flywheel. I have no experience on whether the TMIC or FMIC is better for autox. My experience has been that you sit in line with your engine idling for a long time before you get your run so heatsoak can be a problem and we all know the TMIC's are vulnerable to that. I guess you could get your whole exhaust coated. That techline black satin stuff that Grimmspeed uses is nice (not as good as Jet hot of course) and you can DIY! You could also wrap it after coating it if you're using the stock cast manifolds. Get a turbo heatshield, wrap your y pipe, and put some bacofoil or heatshielding from lowes under your intake manifold. All that should help to keep it cool but your intake temps are still going to be way over atmospheric so maybe an intercooler sprayer if you really want to go over the top.
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