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12-17-2003, 01:37 PM | #1 |
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Yet another 2.0 to 2.5 sti block ?
Yes, i know it can be done. Yes, i know pretty much what it takes (well most everything anyway) .
But, what i don't know is how the engine would take to basically being stock. Yeah, take a stock 2.0 wrx engine and just swap the 2.5 block in place of the regular 2.0. What kind of performance would you get? Would it be safe with the current injectors to do this? Or would i want to upgrade to at least the sti injectors/bigger turbo and all that? What i want is something that has some more torque, but not so much as the snap the transmission like everybody keeps saying it will. Any ideas? The i speed write up doesn't say which turbo they used or much like that. Thanks Brent
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12-17-2003, 01:46 PM | #2 |
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I dont think anyone would be doing much more than guessing. Most likely if you were to tune it to around 250whp (or less) you could use the stock injectors.
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12-17-2003, 04:11 PM | #3 |
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It's being done: http://www.cobbtuning.com/impreza/engineblock3.html
I'm sure it can be done without all the stuff that Cobb does to the shortblock. Maybe Cobb would be willing to share some info w/ you if you buy some stuff from them. |
12-17-2003, 05:00 PM | #4 |
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I don't think we're on the same page. What i was thinking about doing is taking a completely stock 2.5 sti block and mating in to my completely stock wrx heads and leaving everything else untouched on the car.
But, that coob block does look sweet! Brent |
12-17-2003, 05:02 PM | #5 | |
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12-17-2003, 05:04 PM | #6 |
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Block with mismatched heads = disaster. Ask the LS VTEC guys, bet they'll agree.
Full_Clip recommends not doing this project. |
12-17-2003, 05:11 PM | #7 |
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i'm interesting about 2.5 sti block with stock head, keep us update!
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12-17-2003, 05:14 PM | #8 |
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There was one guy that did the swap and just used his stock heads with the 2.5L block. I just got done with my sti block swap (250 miles so far) but I used V8 RA heads...
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12-17-2003, 09:37 PM | #9 |
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Dang, wish i had some ver. 8 heads laying around.
Brent |
12-17-2003, 10:20 PM | #10 |
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Initially we used a USDM 2.5 STi short block, Stock USDM 2.0 WRX heads, helix up pipe, 3”turbo back, VF 30, I-Speed ECUtek at 15psi (Represented by the BLUE line) The RED line was the same car with a USDM 2.0 short block, Stock USDM 2.0 WRX heads, helix up pipe, 3”turbo back, Stock Turbo, I-Speed ECUtek at 15psi Needless to say, I have had a stock STI short block with wrx heads on my car for about 4000 miles now. Currently we have put a 20g and 565’s on the car. It now makes max torque (~ 279) by 3500rpm and hits max whp (278ish) by 6500 rpms. Whoever thinks that this set-up will not work…well…come on over and get a ride Happy Holidays, Chris I-Speed USA [email protected] |
12-17-2003, 10:25 PM | #11 | |
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12-17-2003, 10:30 PM | #12 |
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So you only gained 41 horsepower and 35 pounds of torque with a vf30 and a 2.5 block? ? Shouldn't you be able to gain that with just the turbo upgrade?
With that kinds of gains it doesn't really sound like you gained much of anything. Am i misssing something here? Brent |
12-17-2003, 10:33 PM | #13 |
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Looks like it has been said here already but...
The 2.0 heads work fine on the 2.5 shortblock. I've even seen it used on mildly modded ones. |
12-17-2003, 10:34 PM | #14 | ||
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Full_Clip needs to go and read the conversion forum FAQ |
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12-18-2003, 12:07 AM | #15 |
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Chris
What kind of boost you running on the 20g. |
12-18-2003, 01:38 AM | #16 |
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Swapping blocks and heads like an LS/Vtec WILL work if you do it right, just like with any other motor set-up. If you do it right, it'll last.
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12-18-2003, 02:27 AM | #17 | |
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Many people have gotten really big power from this setup, but they've almost always chosen JDM STi heads. |
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12-18-2003, 09:24 AM | #18 | |
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12-18-2003, 09:48 AM | #19 | |
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12-18-2003, 12:36 PM | #20 |
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So basically with stock heads you're not going to get a ton of horsepower correct? What would be good guess with 2.5 block-2.0 heads and the vf30/34 with sti injectors turned up to a safe boost level?
I'm not going for max power on my car. I want the torque of a bigger engine and i want it everywhere, not just at redline. Thanks for everyone's input. Brent |
12-18-2003, 12:41 PM | #21 | |
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The problem in that case, was that the block was the weak link with a nice head. In this case, the head is the weak link with a strong block. But I'd rather have a strong bottem end with a head that doesn't flow that well than vice-versa. |
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12-18-2003, 12:54 PM | #22 |
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Is anyone making a cam yet that would do better than the stock cams for this setup? I know you can put in the sti cams with somework, but i don't know what all the requirers.
Somebody could make a nice little chunky of change by developing some nice cams and maybe upgraded valves/valve parts. Brent |
12-18-2003, 02:56 PM | #23 |
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JUN offers cams and valvetrain components. Unfortunately they're expensive
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12-18-2003, 03:17 PM | #24 |
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So does Cobb
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12-18-2003, 04:19 PM | #25 | ||
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