[poormansporsche]

At the brakes? Is that like 200WHP? What does that mean. Man If I could get 200WHP i'd be set for sure.

cheers

garrett

 

[tuned_rs]

Dont waste your money on cobb cams. Competition cams will regrind your cams for like $120.00 and you can put some of that money towards springs and valvetrain upgrades. Deck the heads to raise compression and get your intake manifold and head ports "extrude honed" to raise your power range. Any good machine shop can balance your engine and lighten your rods and pistons to rev a little higher. I am looking into having this stuff done myself. Just my .02

 

[kay95]

decking the heads is the worst way to bump CR because what you make in CR you loss many times more with cam timing the best way to increase CR is pistons with dome or less CC heads

some what do you plan to do exactly?

 

[tuned_rs]

How is that any different than thinner gaskets? I wouldnt deck them much, just enough to basically resurface them and the block for a nice fresh surface and maybe gain a little compression.

I really dont know how much to remove from either the heads or the block. Prolly not enough to get excited about.

Explain to me the cam timing issue I really have never been aware of that.

How much do these parts cost? they are crazy expensive and we are only talking about breaking 200 flywheel HP

 

[kay95]

yes gaskets effect cam timing too

just cleaning them up isnt a problem its when you take .050" or more off that it becomes a real problem but can be fixed with either cam gears or if you know about how much the timing changed having a machine shop rekey your stock cam gear
these are expensive because cam gears cost $200 a piece and $75 to have one rekeyed

that why i said to increase CR put 2.2 heads on because the CR is 11.x with this done and add a cam with some porting and you have a very easy 200hp without any EM

 

[got_boost?]

SO what's the modifier on your EJ20x N/A motor? Is it 1, 3, 5, 7, E, T, ect.

It's rumored that some of the EJ20 DOHC heads have gigantic ports. (Seen pictures of comparisons between different EJ20 heads, it's true!) And I venture to say that if you have the right "gigantic port" EJ20 head you would actually be better off using that on an EJ251 block. The difference (from what I know) between EJ20 DOHC and EJ25 SOHC or DOHC heads is only 1cc per chamber. (ie: EJ20 at 49cc and EJ25 at 50cc)

so what with those heads, the EJ25 bottom end, aggressive cams, upgraded springs and retainers, EJ22T oil pump, high compression pistons (12:1 seems streetable with GOOD engine management) (and as for the pistons, not necessarily a wristpin offset difference, but a dome/cc difference) good headgaskets, better injectors, better fuel pump, and engine management.

All I have to say is... that if they can get a 2.2L hybrid F22 Honda motor to do 340+ whp at 18:1 CR, I think 200whp from a 2.5 is possible with less $$$

Also, they can get 13:1 drag motors to run on pump gas with no EM and carbs and stuff, it's timing advancement that generates deadly knock/ping.

 

[kay95]

Also, they can get 13:1 drag motors to run on pump gas with no EM and carbs and stuff, it's timing advancement that generates deadly knock/ping.

13:1 CR + pump gas = ping
13:1 CR + pump gas + retarted timing = high EGTs + burned valves

 

[dpjef]

Sorry to hijack your thread, EJ20, but I'm in the same boat as you

I got an EJ257 shortblock ready to be put in with a set of TWE high comp. pistons (11:1, with coated skirts and crowns). I'm also using Cometic gaskets and TWE Stage II cams with uprated springs. At the moment I also have an Unichip as piggyback, I will go with stand-alone EMS eventually, but too expensive at the moment.

Should I use the EJ25 SOHC heads I have available or re-use my EJ20 SOHC heads to crank the CR up even more ?
The pistons are made by Wiseco (1e produced set apparantly).
Should I be worried about piston-to-head clearance , if I use my EJ20 heads ?
The EJ25 have always been praised for their excellent flow.

 

[redwagon]

It depends what you're looking to achieve. The ports on your EJ20 heads are much smaller than on the 2.5 (we have/had the same heads). That and your compression ratio will make you a real torque monster down low, but it will run out of breath higher up. I'd be worried that you'll have the bad combination of small ports (great velocity and swirl down low) combined with cams that are ground for top end performance.
IMHO you'd be better off with the extra flow than the extra compression, especially above the torque peak.
Of course if you had cubic dollars to throw at this you could probably port the EJ20 heads like the EJ25 items and fit the larger valves and seats. My feeling is that unless you are going to run a very long cam, 11:1 is probably close to your highest compression ratio anyway.

 

[kay95]

well what ej20 heads are they because if they are the ej20r heads use them for sure because they flow better and have better revability than the ej25 heads

 

[poormansporsche]

If you run much over 11:1 you're going to have crazy detonation issues on anything less than 104 octane gas. Given the prices in Los Angeles (3.25 for 91 per gallon) I wouldn't go that route. Just stick to the EJ25 heads. They flow like a mofo. If you really wanted more power I'd try to maybe bore and stroke the EJ257. You'll get mad crazy lowend torque. You might be able to bore it out to 2.6 or so. Probably more reliable than a 12 or 13:1 compression engine too. Since you're going N/A with the EJ257 you don't need as thick cylinder walls so you should be all good. Any thats my $.02

cheers

garrett

 

[X4 SRT]

Sorry to hijack your thread, EJ20, but I'm in the same boat as you

I got an EJ257 shortblock ready to be put in with a set of TWE high comp. pistons (11:1, with coated skirts and crowns). I'm also using Cometic gaskets and TWE Stage II cams with uprated springs. At the moment I also have an Unichip as piggyback, I will go with stand-alone EMS eventually, but too expensive at the moment.

Should I use the EJ25 SOHC heads I have available or re-use my EJ20 SOHC heads to crank the CR up even more ?
The pistons are made by Wiseco (1e produced set apparantly).
Should I be worried about piston-to-head clearance , if I use my EJ20 heads ?
The EJ25 have always been praised for their excellent flow.

First of all get rid of the Cometic gaskets. Monson over on NASIOC has told everyone that the gaskets do not raise your CR, but in fact lower it. Thats right you will be running lower than 10.1 if you install those gaskets on a stock CR EJ251. If anyting just buy some new Subaru gaskets and use those instead.

Second, why use a unichip with whats avaliable now? You now have the choice of the PP, and the I-speed reflash. Both of them are much less expensive than a full standalone, and I'm sure they can both handle what you want to do with your car.

 

[dpjef]

X4SRT : thx for the info, will do original gaskets then.

Why Unichip : because it's what I have already fitted at the moment.
Next step is full stand-alone, probably Autronic, when funds become available :mixed:

 

[scooby_snacks]

Get a shitload of those 5hp stickers, they'll sort you out...









Some right smart bastards on here, wish i had some of their knowledge with cars and was capable of doing anything like them. But i'm retarded with engines and get very confused.

 

[TyAkiona]

How much HP should I have

I was wondering how much horsepower would be good for an 02 bugeye with the Ej25? My plans was turbo it with a 38mm and see if that could get me to around 175hp from the stock 165hp. I just wanted to know what would be a good amount for the car to be light on its feet.

 

[George.of.the.Jungle]

this is for NA applications. might want to do some reading in the turbo section.

http://www.rs25.com/forums/f7-turbo-superchargers/