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Post by blackGSX2g on Aug 7, 2009 11:03:25 GMT -5
I didn't notice that much of a difference in spool-up, I didn't think the Mitsu housing on the 5031 was that bad. I'm almost embarassed to get on it now. Maybe it's just been too long since I've driven it.
Paul, you switched your 50-trim to a t3 awhile back didn't you?
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Post by wishihadatalon on Aug 7, 2009 12:53:50 GMT -5
I didn't notice that much of a difference in spool-up, I didn't think the Mitsu housing on the 5031 was that bad. I'm almost embarassed to get on it now. Maybe it's just been too long since I've driven it. Paul, you switched your 50-trim to a t3 awhile back didn't you? I don't think spool up would be where you would notice it. The volute on the t3 housings is much better than most bolt on housings available so they should spool very well. I think you would notice more in the top end or when you push the turbo. Lower back pressure readings due to an increase in VE is what you will probably see. Much like when we switched Brandy's and Aaron's car over to the FP manifold. The exhaust tone wasn't as deep and Aaron's boost gauge dropped 2psi.
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Post by 99gst_racer on Aug 7, 2009 13:26:48 GMT -5
Paul, you switched your 50-trim to a t3 awhile back didn't you? Yeah, I did. I didn't see much difference in spool time, but it sure did have a better top end. My T3 50-trim was what I dyno'd 400 WHP on.
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Post by blackGSX2g on Aug 7, 2009 17:22:32 GMT -5
Yea the car has phenominal top end, first gear gets eaten up crazy fast and when I was making some pulls to get ready for tonight second gear was useless in the rain as well as it just started kicking out the rear end. My dyno sheets show a huge decline in tq past 4500-5000 with this, but I'm 99% sure that is from not holding boost because of the massive boost leaks since it seemed like a linear decline with MAP.
Too bad it's pouring rain, I would have liked to see everyone and make some shakedown passes before the shootout.
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Post by SPOOLD on Aug 7, 2009 19:43:49 GMT -5
what about next wednesday test and tune?
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Post by blackGSX2g on Aug 8, 2009 5:59:34 GMT -5
A possibility. Paint is going to start going on tomorrow, so it'll be ready for the SO. I'd rather not rush the paint, so if its done I'll probably head out. If not, I'll just hope they reschedule one of the midnight madness events since the last 2 or 3 got rained out.
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Post by blackGSX2g on Aug 9, 2009 8:45:30 GMT -5
Here's an update on another upgrade that got finished up: I've always been bothered by my exhaust drone on the highway, so I've been trying different ways to cut down on it. First trial was to run a QTP 3" exhaust cutout with several 1" dia holes cut in the plate. The idea was to restrict exhaust flow with the flapper closed, and with the flapper open it would flow like a normal 3" exhaust. This worked OK for driving (sans the max boost of 3psi), but didn't suppress idle noise very much, and I was worried about increased backpressure. For my second trial, I picked up a stock 2g turbo muffler (twin tip)and cut the top part open. I ran 3" pipe straight through one tail pipe, and added my QTP cutout (with a new plate) in the middle of the muffler. I then cut a 2" hole before the cutout, and routed that with smaller preforated pipe for 3 180* turns and packed the muffler full of packing. The idea was to have a normal straight through muffler with the flap open, and actually have some muffling ability with the flap closed. After hours of welding, cutting, and losing a quart of blood I had it done, but the cutout motor hit the bottom of the trunk sheet metal I was going to just cut a circle out of the trunk to allow it to fit, when I came across this gem from overseas: I ordered this thing on a Saturday afternoon from New Zeeland, and it was sitting outside my office Tuesday morning. They stole my idea, but they made it look better and fit under my car: The difference is AMAZING. With the flapper closed, I can't even hear the exhaust on the highway. With the flapper open, it functions as a normal 3" in/out muffler.
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Post by Agent11br on Aug 10, 2009 9:03:11 GMT -5
that's pretty badass Matt! Is that a euro tuner deal from across the atlantic? Looks like it'd be right at home on a bimmer.
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Post by 99gst_racer on Aug 10, 2009 9:36:49 GMT -5
How quick does the butterfly actuate? 3-4 seconds?
It would be cool to wire in a hobbs switch and have the cut-out automatically open at a certain boost level.
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Post by blackGSX2g on Aug 10, 2009 11:32:45 GMT -5
that's pretty badass Matt! Is that a euro tuner deal from across the atlantic? Looks like it'd be right at home on a bimmer. Actually the only car I saw it on was a WRX. I looked through hundreds of car boards to see if anyone was using them. All overseas. Lots of people seemed to have interest in it, but nobody had the balls to buy it and try it, so I was kinda going out on a limb. How quick does the butterfly actuate? 3-4 seconds? It would be cool to wire in a hobbs switch and have the cut-out automatically open at a certain boost level. Takes about a second or two. I thought about something like that, but it would really hurt spoolup by being closed until it hits a certain boost level. Plus, when I'm in full DSM mode, I like to have the valve open and have the nasty cammed loping idle.
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Post by Agent11br on Aug 10, 2009 12:52:34 GMT -5
Very cool, I never would have thought of putting the flapper in the muffler itself, I'm still awe inspired by the ingenuity of it all. I also like that it's a dual tip stock look-alike. I think that helps to retain even more of the sleeper like 2g sexiness.
PICS NOW on the ride OR BAN! lol ;D
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Post by 99gst_racer on Aug 10, 2009 14:02:34 GMT -5
Takes about a second or two. I thought about something like that, but it would really hurt spoolup by being closed until it hits a certain boost level. Plus, when I'm in full DSM mode, I like to have the valve open and have the nasty cammed loping idle. Ahh, I didn't think it restricted spool up so bad. In retrospect, it would be much better if it was throttle based. That's a pretty quick response time though. Sounds like it's quicker than my electric cut-out.
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Post by blackGSX2g on Aug 10, 2009 15:53:02 GMT -5
Very cool, I never would have thought of putting the flapper in the muffler itself, I'm still awe inspired by the ingenuity of it all. I also like that it's a dual tip stock look-alike. I think that helps to retain even more of the sleeper like 2g sexiness. PICS NOW on the ride OR BAN! lol ;D Well the flapper didn't work the way I wanted before the muffler. My next thought was to have a Y-pipe and 2 mufflers, one regular and 1 normal, but that would be a lot of weight and a lot of fab work. Then I found a factory twin tip for free and the only reason it didn't work out was the height of the cutout. I can't believe they don't sell that Varex here in the states, seems like there would be a good market for it. Pics to come, the rear bumper is off the car and getting ready for clearcoat, and the front fender is getting repainted as well. Ahh, I didn't think it restricted spool up so bad. In retrospect, it would be much better if it was throttle based. That's a pretty quick response time though. Sounds like it's quicker than my electric cut-out. I haven't given it WOT with it closed to fully test, but there is a lag there which makes sense. The flapper is operated via a remote control, so that makes the possibility for activation endless. For now, I'm working on mounting the circuit board with an OEM 'Performance / Economy' switch off of a car with an auto trans. Either put that next to the cig lighter or in the ashtray.
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Post by blackGSX2g on Aug 11, 2009 12:02:54 GMT -5
Well thanks to all this humidity, I don't think paint will be on everything unless it dries out by Thursday. Looks like I'll be rollin' ghetto to the shootout.
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Post by SPOOLD on Aug 11, 2009 18:36:52 GMT -5
lots and lots of fans and dehumidifiers
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