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01-31-2012, 03:39 PM | #126 |
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Join Date: Dec 2004
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MAIC
Location: Hagerstown, MD
Vehicle:2005 CGM STI 10.03 @ 135 |
Micah could always give me one of these engines and we would have some results
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01-31-2012, 04:23 PM | #127 |
Former Vendor
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NWIC
Location: Marysville, WA
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01-31-2012, 04:25 PM | #128 |
Scooby Guru
Member#: 158864
Join Date: Sep 2007
Location: Aussieland
Vehicle:2003 SOHC destroker |
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01-31-2012, 04:33 PM | #129 | |
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Member#: 158864
Join Date: Sep 2007
Location: Aussieland
Vehicle:2003 SOHC destroker |
Quote:
my intention is track circuit racing/time attack. looking @ the dyno graphs we have so far it's clear there is a bit of power dropoff. i was under the impression that this was simply the hotside of the turbo being not-quite-big-enough at 0.82, yet the 1.05 is simply too laggy. hence, me thinking with more RPM the 1.05 would be ideal. are you saying that the dropoff is in fact a product of a restriction in head flow rather than the hotside of the turbo? if so that's kind of a shame as a ton of headwork is much more difficult/expensive compared to a simple hotside swap but, if that's the case then such is life. having said all this, it appears/you guys have mentioned that the cams used simply haven't been big enough and that might be the cause of the dropoff. keen to hear your thoughts on the matter, i'm sure there is a bit of testing to do with cams/exhaust hotsides yet. |
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01-31-2012, 04:50 PM | #130 |
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There are a handful of things that need to happen to push a Subaru motor that high.
1. Intake manifold. We will need the plenum volume and short fat runners to feed enough air in the engine. Also, the firing order of the engine makes proper intake manifold design a little tough. 2. Cams: Right now there isn't a cam profile made for a 10k rpm engine. Custom cams would be required as a minimum. 3. Head flow: While these heads don't flow a ton, there are big differences from port to port. 20% difference in exhaust ports from the factory. At 300hp that's a significant difference in flow, but at 900hp we're really talking about a major tuning issue. Our porting program is designed to provide less of a difference in flow between cylinders while still removing as little material as possible to provide good velocity. 4. Cooling: the STi water pump won't cut it. The 2L water pump is a good pump that experiences less cavitation at high rpm. I think it is possible to expand on that pump a little to increase flow output. Getting more cooling to cylinder 4 is also a priority for us. As Vicious pointed out, a larger hotside is required. This is a given. As cam size goes up, so does the hotside. The challenge is getting as much air in and out of the engine will at the same time minimizing overlap. In order to do this, you need a lot of lift as these heads really flow well at almost 12mm. The issue with that is then trying to prevent valve float at such a high rpm with a big cam. Increasing spring pressure increases parasitic loss... It's a big circle, really. |
01-31-2012, 05:19 PM | #131 | |
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Location: Netherlands, Europe
Vehicle:1974 VW 2.2ltr 7670 402 WHP @ 30psi |
Quote:
Its just a matter of money, same as with any engine, whether its an evo or any other platform imo. |
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01-31-2012, 05:31 PM | #132 | |
NASIOC Supporter
Member#: 130990
Join Date: Nov 2006
Chapter/Region:
NWIC
Location: Menzel Lake, WA
Vehicle:06 Red Ltd.Wagon Dom 1.5xtr JJ tuned |
Quote:
15k easily. C'mon, Dom. if anyone can make this work, you can. |
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02-01-2012, 02:44 AM | #133 |
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Join Date: Sep 2007
Location: Aussieland
Vehicle:2003 SOHC destroker |
F1 engines also need an entire team of people/equipment including a laptop computer to start
dom - i saw you've done testing with a gt3082, have you done anything with a gt35 1.06, or a big badass 280 degree cam or similiar? any news on the 77mm crank front? i'd love to hear about what you & micah are developing with that one if you're not under an NDA and can tell us of course |
02-01-2012, 10:56 AM | #134 | ||
Former Vendor
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Quote:
We just need to meet up for a beer and talk things over already!! I did just place an order for 3 extra sets of 300 M I-beams with 625 bolts Quote:
3MI Racing is saving to have parts in stock and then to build equity for a 5-axis mill. Dom hit you with the basis of what's needed to make it run happily at speed and the water pump is something that needs to be addressed for an engine living at the RPM (see road course work). I do have my 'suspicion' that the cast impeller is much better than the stamped steel...but I'm never happy without hard evidence. The valve springs are actually proving to be the limitation of ONE setup that I've had were the springs relaxed. May be a fluke but the valvespring company sent me a new set to replace and retest...Don't ask names as I won't say as I'm working with them and they're working with me to resolve/see if it is an actual issue. -Micah |
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02-01-2012, 11:47 AM | #135 | |
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Join Date: Dec 2004
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Location: Hagerstown, MD
Vehicle:2005 CGM STI 10.03 @ 135 |
Quote:
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02-01-2012, 11:56 AM | #136 |
Scooby Guru
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Location: Aussieland
Vehicle:2003 SOHC destroker |
iirc i remember seeing somewhere someone had popped open the water/oil pumps from both turbo and NA models and found the NA pumps to have much, much smoother impellers.
food for thought. |
02-01-2012, 12:06 PM | #137 |
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Delete
Last edited by Spike_916; 05-30-2019 at 03:05 PM. |
02-01-2012, 01:02 PM | #138 |
Scooby Guru
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Location: Aussieland
Vehicle:2003 SOHC destroker |
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02-01-2012, 03:16 PM | #139 | |
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Vehicle:'02 Bugeye Silver |
Quote:
The big plans should unfold in the next few months and then i'll likely have results that I'd be willing to share... maybe. |
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02-01-2012, 05:47 PM | #140 | ||
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Join Date: Jul 2007
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NWIC
Location: NW WA
Vehicle:07 STi |
Quote:
Quote:
Oh yeah, hurry up and get your RSTi finished Dom! Can't wait to read about it and geek out. |
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02-01-2012, 07:48 PM | #141 | |
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Location: marysville,WA
Vehicle:unde your hood makin your **** go faster |
Quote:
it drives right now. were just changin the heads to add avcs to the engine. |
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02-05-2012, 09:55 PM | #142 |
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Location: Under your hood :-)
Vehicle:1995 Impreza Coupe w/ "Extras" :-) |
GT4094, 2.35L Engine, 8200 Rpms and 28 PSI... Just dyno tuned saturday.
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02-05-2012, 10:05 PM | #143 |
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Location: Port Orchard, WA
Vehicle:05 HTA3586,BB 2.5L CGM |
Well my big bore version of this engine is alive, damn that moroso pan and it still leaking GRRRRRRR! But hopefully some results. FP GT3586 Big HTA with 2.5" uppipe and 2" primary header with big lift kelford 199C cams, dual 044's and E85. Oh ya a bunch of other stuff too..
BTW Congrates Mike the ole GC8 is going to be a demon.. |
02-05-2012, 11:53 PM | #144 |
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Join Date: Mar 2002
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NWIC
Location: Lacey, WA
Vehicle:01 STi DOMINATOR 3 444 WHP 431 WTQ |
Congrats mike! I can't wait to see this thing go down the track.
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02-06-2012, 01:21 AM | #145 |
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Vehicle:06 WRX 30r 6 speed 99L EJ255 6 Speed |
Love the seats
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02-06-2012, 11:33 PM | #146 |
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Vehicle:2004 Wrx JBP |
Last edited by eliezerrosario; 02-06-2012 at 11:43 PM. |
02-07-2012, 12:57 AM | #147 |
Scooby Specialist
Member#: 25952
Join Date: Oct 2002
Chapter/Region:
NWIC
Location: Under your hood :-)
Vehicle:1995 Impreza Coupe w/ "Extras" :-) |
The header is a 1st gen Full Race twin scroll header. The uppipe is a full race twin scroll T4 header. The turbo is a GT4094 with a 0.95 a/r exhaust housing.
The heads are CNC ported B25 heads. They have a total of 1500 miles on them and were 100% brand new when they were machined. During the porting process, the valve seats were enlarged to take advantage of the +1mm intake and exhaust valves. The valves are made by supertech... Nitrided intake valves and inconel exhaust valves. The cams are Kelford R-199-C cams for an 04-07 STI. 272 / 272 duration. Lift is 11.5mm intake and 11.1mm exhaust. They are setup for avcs but I have not run avcs yet for two reasons. First reason is my neutral switch operates backwards of how it should which prevents AVCS from working. The other reason is I have absolutely no idea how much advance I can run due to the 9:1 pistons, +1mm valves, and the high lift cams. When the engine was assembled, I did not take the time to clay everything. I have been told that I can run up to 7-10 degrees of advance, but I am not sure running say 5 degrees would really be worth the risk. The car is not daily driven and spool is not my highest priority. |
02-07-2012, 01:58 AM | #148 |
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Vehicle:2004 Wrx JBP |
^thank you
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02-07-2012, 06:27 PM | #149 | |
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Join Date: Nov 2003
Vehicle:2004 STI WRB |
Quote:
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02-07-2012, 07:17 PM | #150 | |
Former Vendor
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Join Date: Oct 2008
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NWIC
Location: Marysville, WA
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Quote:
What do you want us to say? I'm not surprised by the results at all. I'm very happy to see them here in the thread, but I'm not going to go snubbing people who were naysayers about it. 620whp on a Mustang dyno is no **** jack. I think it says everything we've been trying to say. I honestly want to change that turbo to a BW. I have a sweet one that flows more and spools faster than a 4094. The larger compressor in that turbo is a slight mismatch and hurts short stroke engines in the spool department. |
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