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07-12-2010, 11:39 PM | #1 |
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Here it is.. hopes it enough info...
Thought id add the vid.... Event: Dyno Location: Performance Race Engineering. Portland, OR Ambient Temp: 81F Elevation: ~178ft Weather: sunny Car: 2004 WRX 2.5l Hybrid (EJ257) Tuner: Bobby @ PRE Dyno Info: Dyno Dynamics Transmission: 5spd Stock Gear: 3rd Peak HP at RPM: 319.6WHP @ 5750RPM Peak Torque at RPM: 346WTQ @ 4900RPM Baseline hp/tq for a stock on same dyno: STOCK ~185whp: 2.5l Hybrid TD04 225WHP/270WTQ (all existing mods except turbo and injectors) Target Boost: 19psi Tapered to 17psi Target AFR: 11.2 Fuel: 92 Octane Unleaded Shell V-Power Engine/Power Modifications: TurboSmart MBC, Stock EJ257, Stock EJ205 Heads, GPmoto Short Ram w/AEM Dry Filter, AVO Silicone Intake, HTA68 w/8cm, APS Topmount, APS Hybrid BOV, GPMoto EL Headers, TopSpeed 4" DP, Titanium 3" Catback. Driveline Modifications: Stock Transmission, Stage 2 Exedy Clutch Suspension Modifications: IPD Struts, GPmoto Coiulovers, IPD Tower Braces Other Modifications: Front Brembo Calipers... WHP, WTQ... Uploaded with ImageShack.us AFR, PSI... Uploaded with ImageShack.us Thanks For Looking!
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Last edited by Flyin_Hayn; 09-16-2010 at 12:41 PM. Reason: Lack of info..Corrected |
07-12-2010, 11:58 PM | #2 |
Former Vendor
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Full boost at 4k RPM and a huge nose dive in power after 6k RPM? That's not much of a powerband for this "godly" turbo
-- Ed |
07-13-2010, 12:07 AM | #3 | |
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Quote:
and full boost was @3800-3900 i honestly couldnt complain. heat soaked top mount and 80degree shop temp. The heat + an ~8.881:1 compression is gonna kill your top end.. 0.02 a dyno# is a dyno number. I admire its ability to hold above 17psi to redline.. Last edited by Flyin_Hayn; 07-13-2010 at 12:49 AM. |
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07-13-2010, 12:56 AM | #4 |
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Your thread is lacking detail. Fuel? AFR's? Elevation, etc..
http://forums.nasioc.com/forums/show....php?t=1858764 |
07-13-2010, 02:57 AM | #5 |
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I dont know if my turbo is gifted but my 16g holds 18psi till redline on my ej205 and its a small 16g!!
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07-13-2010, 03:12 AM | #6 |
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2 liter vs a 2.5 is all thats going on. Plus what size hta is it? 10cm? what?
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07-13-2010, 04:36 AM | #7 |
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Second pic shows afr and boost
19psi peak tapered to 17. Cut it off @ 19 due to top mount. Afrs are 11.2~3 |
07-13-2010, 04:37 AM | #8 |
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Info added.. hope its enough..lol
Last edited by Flyin_Hayn; 07-13-2010 at 05:42 AM. |
07-13-2010, 05:43 AM | #9 |
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07-13-2010, 06:03 AM | #10 |
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It's not your topmount.
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07-13-2010, 06:20 AM | #11 |
Sammo Hung
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its your short ram in the engine bay..
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07-13-2010, 08:00 AM | #12 | |
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Quote:
The project is progressing OP, did your tuner comment on why power is dropping off? Usually on both the 2.0 & 2.5 power carries to redline. |
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07-13-2010, 09:53 AM | #13 |
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Hot weather
Top mount higher compression 10.5 dip ? eek |
07-13-2010, 11:30 AM | #14 |
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Could this be related to the problems associated with the CC of the 2.0 heads on the 2.5 block?
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07-13-2010, 11:30 AM | #15 |
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I've pushed as much as ~30 psi through mine now above 5krpm on a 2.0.. The turbo can produce decent boost - But I have noticed that it is pretty cranky about getting a good fresh air supply.. On a dyno without a fan on the intake filter I couldn't build more than 23 ish PSI.. On the road with my intake sitting behind an open foglight, 28psi to redline was no problem. - And this was on the internal gate.
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07-13-2010, 11:41 AM | #16 | |
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Quote:
http://i12.photobucket.com/albums/a248/Hans91GT/Rob.jpg |
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07-13-2010, 01:46 PM | #17 | |
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Quote:
The comp ratio in the ej257 is ~8:88:1. That's a big jump from 8.35?:1? Bobby said that the dip up top is almost identical to his other tunes. Says the compressor can't. Keep up with the 2.5liter displacement demands. He said the 2liters will continue to clime because that turbo can supply them easily where as the td05 runs out of breathe up top. He said porting and polishing the heads and larger cams will eliminate that almost completely. Another note he said was that they actually make more high end hp on the hta with unequal length headers. "The lower end torqque almost helps the engine climp up top.." I'm gonna port my stock headers and pick up an up pipe to make comparisons sometime in the near future. I've noticed the stock wrx longblocks are making even more on this turbo and the evoiii near the top and I believe its directly related to there lower compression ratio imho. If you take a look @ some dyno graphs of the ej255 and ej257 the 255 really shines up high, where as the 257 with 2.0heads shines much better low to mid and begins to drop up near 6k~ All in all I personally believe. The ej257 hybrids aren't all there set out to be without bored out heads or a complete swap. The stock 2.5 sti long block would've mad 330 with my set up and I'm guessing no drop up top. Let me know what you guys think... Last edited by Flyin_Hayn; 07-13-2010 at 02:03 PM. |
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07-13-2010, 02:06 PM | #18 |
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Do you think my turbosmart mbc is effecting boost threshold.....? It is a cheap little thing LOL.
Check out the vid, tell me if there's anything out of the norm... Sound quality bites.. http://m.youtube.com/#/watch?desktop...BzyC2lNM&gl=US Last edited by Flyin_Hayn; 07-13-2010 at 02:11 PM. |
07-13-2010, 02:15 PM | #19 | |
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07-13-2010, 02:25 PM | #20 | |
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Quote:
So you compressor cant keep up at 17psi....but if you add 10 ft of piping and 3psi the compressor gets magically better And yeah.....it looks like that mbc sucks....i was going to ask how he got it to taper like that |
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07-13-2010, 02:30 PM | #21 |
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Yeah that's why I was confused!???
I honestly think this dude gets you a big number and ****s off the rest of the tune. How do ppl peak @ 23 and hold above 20 to redline But I can keep boost above 18 to 5500....? Maybe a little heat soak but cmon.. |
07-13-2010, 02:32 PM | #22 |
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Yeah that's why I was confused!???
I honestly think this dude gets you a big number and ****s off the rest of the tune. How do ppl peak @ 23 and hold above 20 to redline But I can keep boost above 18 to 5500....? Maybe a little heat soak but cmon.. |
07-13-2010, 02:56 PM | #23 | |
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Quote:
I mean I thought they came about because 2.0L owners wanted a little more daily driving off-boost grunt than a low compression 2.0L could give. A new 2.5L shortblock is right around the same cost as a rebuilt 2.0L, so when it came time to rebuild, just slap your heads on a 2.5L. I don't think anyone created the hybrid with expectations it would perform the same as a true EJ255 / EJ257. Some people may have that expectation now, but I don't think it was ever billed that way in the beginning. |
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07-13-2010, 02:56 PM | #24 |
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get a hallman.....if you want one pm me. im a vendor on here.....
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07-13-2010, 03:24 PM | #25 |
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Im having the same problem. My car has the sti block with forged pistons and the stock heads. Im running a green HTA and only made 315 @ the wheels.
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