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Old 09-14-2008, 09:25 PM   #1
00LGTP
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Default should i boost?

my RS is gonna be back from insurance this tuesday. i have delta cams waiting to go in. i have thought of the idea of boosting and i have some questions....

1. delta 2000 grind cams and boost together? any pro's and con's?
2. sell the cams and get some sti pistons/rods and boost it then?
3. what power can i get from delta cams/SAFE boost...(nothing over 8psi)?

if i want to boost, what else would i NEED? i know some engine management (pp6?)

i know the stock injectors are limited too....7-8psi i think. but that would be a good limiter for me.

i would plan on building my own turbo kit. BTW

since the car has a salvage title now, would i run into problems with boost/cams for emissions? what would the DMV say...ect?
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Old 09-14-2008, 10:52 PM   #2
impreza_GC8
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I can't give you firsthand experience but boost + cams on a Subaru is not done. It just isn't done. It isn't reliable and if you are boosting an engine that was meant to be N/A then reliability needs to be your top priority.
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Old 09-15-2008, 07:31 AM   #3
Chocoholic005
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If your keeping it under say 7, keep the cams and get a really good tune. Delta does have a set of turbo cams, but those would work fine. I suggest something a little better than the pp6 if you are gonna keep the stock internals, i would trust it more on an engine with better internals since you would have more room for error, but with stock internals em is where you should put your money. Just to be safe.

If you injectors can't keep up, a small upgrade isnt expensive, only a few hundred or less depending on size.
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Old 09-15-2008, 11:43 PM   #4
front runner
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You don't want to find out the hard way that your injectors are too small. it's almost as important as oil in a boosted motor. boosting lean is one of the worst things you can do. You break lands and melt pistons. And yes, you should boost. Get the STI internals and go big because home made boost is addicting.
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Old 09-16-2008, 06:10 AM   #5
VIsubi
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get the avo kit comes with a 5th injector and engine managment for the recommended 6psi of boost on stock internals...use that then save up for an STI block either 2.0 or 2.5 if you have either or in NA vehicle..the block bolts up to the heads very easily...me I plan on running no more than 6psi..just want to get some better passing power and power in the twisties.
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Old 09-16-2008, 06:19 PM   #6
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Quote:
Originally Posted by VIsubi View Post
get the avo kit comes with a 5th injector and engine managment for the recommended 6psi of boost on stock internals...use that then save up for an STI block either 2.0 or 2.5 if you have either or in NA vehicle..the block bolts up to the heads very easily...me I plan on running no more than 6psi..just want to get some better passing power and power in the twisties.

that EM isn't programmed to deal with different cams.


OP: if you do turbo the car, i'd recommend finding some stock cams. The turbo causes the exhaust pressure to go up (that pressure differential is what drives the turbo), and very often the exhaust pressure will be higher than the boost pressure. If you've got overlap on your cams, the exhaust will get driven back into the piston. Even if boost > exhaust pressure, the system will still be very inefficient, which will result in lots of heat. Heat =
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Old 09-16-2008, 10:24 PM   #7
Chocoholic005
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the overlap on the 2000 series cams is not that big, unless he goes past say 15psi, he will be fine with the small overlap.
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Old 09-16-2008, 10:30 PM   #8
sniper1rfa
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Quote:
Originally Posted by Chocoholic005 View Post
the overlap on the 2000 series cams is not that big, unless he goes past say 15psi, he will be fine with the small overlap.

Fair enough. What about the EM?
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Old 09-17-2008, 01:43 AM   #9
VIsubi
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even though the EM isn't a stand alone its still tunable so that shouldn't be a problem...speaking of CAMS thats the same deal with the 2.5i's the cams and choco's right that overlap isn't anything to cause extreme differential pressure between exhaust and turbo..well not enough to cause harm running 6 psi of boost atleast.Gona try out the kit anyways while I save for my sti block also.
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Old 09-17-2008, 08:46 AM   #10
gumby647
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Here's my take. Sell the cams, they are not the best grind for a turbo. Delta say they have a turbo specific grind if you want to do cams get those. Otherwise save your money for other things.

For engine management get the E-manage Ultimate and WRX injectors. The 5th injector PP6 is too limiting if you want to make more power later on down the road. The best thing if you can afford it and don't have to worry about OBDII testing is the Hydra. It's plug and play and does what it needs to do for a fair price.

On building the motor. I'd leave it stock to start out. When you are trying to get everything working and tuned there's a good chance of breaking it. Especially if you don't know what your doing. It will hurt a lot less to break a motor you're planning to rebuild than it will to break an engine you just rebuilt. Plus if you can get it running safely on the stock internals you'll have no problem tuning a lower compression setup. I'm running 12psi with a 3071R on my stock motor. Another advantage to going this route is that you can see where you'd like to improve when you do the build. If it's weak on top maybe you do want cams or maybe you like the low end hit so you only lower the compression a little bit.

My buck-0-five
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Old 09-17-2008, 05:20 PM   #11
impreza_GC8
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Quote:
Originally Posted by gumby647 View Post
...I'm running 12psi with a 3071R on my stock motor...
Interesting. What EMS are you using to run this? It must be a very very good tune since you are still stock motor.
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Old 09-17-2008, 05:45 PM   #12
gumby647
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Quote:
Originally Posted by impreza_GC8 View Post
Interesting. What EMS are you using to run this? It must be a very very good tune since you are still stock motor.
I'm running a Hydra. I'm certain that the extra money spent on the ECU is what's doing the trick. I have heard of people running more boost on a stock bottom end before but I have very little advance now and don't plan to push it any harder till I get the meth.

DaveW
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Old 09-17-2008, 06:18 PM   #13
kingsoup85
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Sean2.5Black is in the process of swapping in a ej20g shortblock with his 98 rs delta cammed heads, pm him and see how that's going, i think he is using the pp6 as management
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Old 09-17-2008, 10:33 PM   #14
IllNastyImpreza
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Default

If you Need to pass CT inspection, you Need the Emanage Ultimate.

If you are planning on building your own turbo kit, than you need to decide exactly WHAT your goals are. Are you gona rallyx ? autox ? 1/4 mile ? what are your power goals?

A small TD04 turbo kit is both cheap, and readily available anywhere on these boards. It also spools SUPER fast and is more than enough for your otherwise stock engine.

If you're looking for more power, you are going to break your drivetrain. PERDIOD (do more reasearch before continueing...this is when a full sti swap becomes quite favorable. You can find a full sti engine & drivetrain with hubs, brakes,wheels. and even the seats for about the same money as you are going to spend on your aftermarket build anyway)

also...stay away from cam grinds! do you really want to trust internal components in your engine that have been welded together ??? Its like sticking a pinecone to a stick with peanut butter and spinning it....how long will it take to come off ??
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