X64v
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Posts posted by X64v
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A little update I guess, as I'm bored in chemistry again.
The injectors I bought from motorman are still working great after 8 months of daily driver use, both under N/A and turbo duty.
However, I would NOT recommend the MSD fuel pump, as the main post did above. I bought it shortly after the injectors, and initially it was okay, but it rapidly became very noisy, and began to heat up during prolonged use and loose flow. I had to replace it within a few months (threw a stock 280zx pump back in, soo much quieter). I would have sent it in for repair, but bought it from a small speed shop and didn't ask for a receipt
.I did a quick search here and found that some others have had problems with the pump as well, similar to what I experienced. That doesn't mean they're all bad, but take it for what it's worth.
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Found it.
http://www.usrallyteam.com/content/tech/injector_staging_article.pdf
The ellipsis was getting in the way of the url.
EDIT: Wow, that's an excellent article. Not only did it cover the advantages/disadvantages of stand off injectors, it touched on Braap's throttle body sizing arguments, rontyler's plenum air distribution work, and Drax240z's dyno tuning thread as well.
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Tony D is on to something. Look at the bolt hole directly underneath the mouth of the carbs...I do not believe Hitachi SUs ever used one there, just the one on either side.
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Looks awesome!
What kind of injectors, or injector housings are those? I love the idea of an fittings for feed rather than a fuel rail.
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Is that Princess Leia in the 2nd one singing? And Luke?
Yeah, with chewy on the drums, vader on bass, c3p0 on keyboards, and r2d2...standing there. Awesome huh?
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Bartman - if your stumbling is happening upon mild acceleration, then I can say that it is not because of the fuel lines you're using (as long as they're not clogged or anything). I'm using the stock '73 feed and vent line as a return (same as you) on my turbo motor with no flow issues whatsoever. Granted my turbo motor is no lt1, but I doubt your lt1 needs more fuel upon mild acceleration than my turbo motor does at full boost/7000rpm.
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I'd be delighted to do some Db tests. It's so hard to qualitatively 'tell' how loud/quiet it is, without having numbers.
I should have said something earlier, but the sound levels in the videos are deceptively quiet. The tone is right, but the volume is off. They were just taken with a digital still camera on video mode. I can get access to a digital movie camera this weekend, perhaps I'll take some more video and see if I can get some better clips of it.
Shoot me a pm and we'll talk.
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Tony: At what angle should this cut be? Obviously, if you're looking to maximize the area of the outlet, as the angle of the cut approaches 90* from normal, the area of the outlet will approach infinity, but in this case, the limiting factor is the ground. In your opinion, how much of a cut will show benefit, while still keeping the beautiful ground clearance I have with this exhaust?
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Ah, well you learn something new every day.
I wasn't calling it a resonator for the straight through design, as I know there are straight through mufflers that do quiet the exhaust down quite a bit. I had always thought the difference between a muffler and a resonator was it's size and decibel reduction. Since this had such a small volume and just changed the tone instead of reducing the decibel volume of the exhaust that it was just a resonator.
But now I know; thank you Tony for the enlightenment, as always.
While I'm at it, I'll post an update. I drove to Phoenix this past weekend, a two hour open highway drive. Cruising at speeds ranging from 75-90 (which correspond to 2500-3000rpm in 5th with my gear ratios), the noise level was just perfect for me. With this exhaust and the windows down, I could still hear my stereo perfectly clearly, and did not have any ringing ears by the end of the trip. However, I could still hear the tone of the engine with the stereo up, in case anything changed. I used to have to pause my cd and listen if I thought the engine had changed pitch.
I also have not had a cop give me a second look. So, to wrap it up, I love this exhaust.
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When people pronounce across "acrosst." There's no T.
Also, using good as an adverb, which it is not.
Although those are pet peeves, not misnomers.
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I'm running 8.8:1 compression on my bonestock '73 l24 longblock, running 7psi on 91 octane. No intercooler, even pulled hot air from the engine compartment while it was 110 outside here in the desert, no detonation, no problems. '73 E88 head btw.
The rods and crank in that l26 shouldn't be any weaker than in an l28. Some info is floating around that says that l28et rods were shot peened from the factory, but other than that they're they same as the other rods. People have used l24 rods successfully, as well as l28e rods and cranks.
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Wow, some of those are really neat. Notice the downflow aluminum radiators? A little weird. And the complexity of the turbo header/wastegate plumbing on the toyota-v8-supra?
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aahahaha, aux that's freakin great!
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I have had no trouble swapping between 4 speed gears and 5 speed gears. I currently have a 4 speed gear in a 5 speed housing. I know there are early and late housings (one's black and one's gray), but are you saying there are two different black (early) housings, and two different gray (late) housings?
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As the title says. I need a red 20 tooth gear for the 4.11. I found this place, and the price is right on the gear, but $10 just for shipping? I'll do it if I have to, but first does anyone know of any other sources, or simply have that gear I could grab for a few bucks?
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Dirt poor freshman in college.
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Ha, I'm with proxlamus and aziza, but didn't wanna say anything either.
Yell at prox, he started it...
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My whole English class just asked me why I was crying...
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Ha, that's just your luck, Mario. Thankfully you're car isn't a barbecue..
And yeah Phil, it sounds quite awesome. Even off boost I can hear the turbo spool up and down, like a little jet engine on my engine.
This first vid is a cold start and normal paced drive around a few streets on the way to school. Pretty uneventful, but you can hear what it sounds like around town.
http://smg.photobucket.com/albums/v472/X64v/?action=view¤t=P1020376-MPEG-4.flv
The second is a 1st/2nd wot run. It takes a while in first because I didn't launch, just let the clutch out and floor it and let boost build. Thanks to my trusty cameraman/roommate, all you can see is the dash.
http://smg.photobucket.com/albums/v472/X64v/?action=view¤t=P1020378-MPEG-4.flv
The third is obvious.
http://smg.photobucket.com/albums/v472/X64v/?action=view¤t=P1020379-MPEG-4.flv
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I just spent a week there in June for a family reunion. Beautiful place, if you're Irish you'll feel right at home, even if you've never been there. I'll give you a rundown of all the places I saw, and some reference pictures as well (I took over 800).
Dublin: Really neat place, like the east coast but cooler. The night life is excellent; a few of the pubs have live music/dancing. For daytime places, Phoenix Garden, Trinity College, and St. Patrick's Cathedral are all neat to check out. If you're a drinker, Guinness is based there, where you can take a guided tour of the brewery.
Powerscourt Gardens: When I heard we were going to a giant garden, I was less than enthusiastic. Turns out, this was one of the best stops on my trip. It's an absolutely beautiful place. I spent three hours there and didn't get to see all of it. Try to allow yourself more like four hours if you really want to see everything. This one's a must see, if at all possible.
Waterford Crystal: Where they make most of the crystal trophies for the major sports, as well as things like the millennium ball, elaborate chandeliers, etc. The hour-long guided tour was packed with some pretty crazy stuff (for example, the cutters that cut the designs into the crystal have to know hundreds of complex patterns by memory). They also perform wallet lightening there as well, as your wife will not want to leave empty handed, and their crystal is both bright/shiny, and $$$.
Cobh: Visited the Titanic museum there. Cobh was the last port of call for the Titanic before New York. Nice display/miniature museum if you're passing through the town, but I wouldn't go too far out of my way for it.
Blarney Castle: Not much of an explanation needed, it's the castle where the Blarney stone is. Really awesome castle, though I didn't get to kiss the Blarney stone because it started pouring rain as soon as I got up there.
Muckross House: Very old mansion, full of history. If you're a history buff, the tour is filled with it, and would be very interesting. The stories the tour guides tell of the money the owners spent on this house is just baffling. Same thing as the Titanic museum; worth your time if you're in the area, but I wouldn't sacrifice a lot for it.
Cliffs of Moher: The second must see of the trip. They're amazing cliffs on Ireland's west coast. Really stunning beauty, and the view is even better on the 'private property' (see pic blow). If at all possible, fit this into your schedule.
We also stayed at a beautiful hunting lodge, and ate dinner in a castle, but for the life of me, I can't remember the names of either of them.
Our tour basically made a big smiley face throughout southern Ireland, so I cannot recommend/reject anything in the north.
If you want any more detail on anything, just ask or send me a PM.
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Ha, good one. How much boost are (were) you running?
and what was causing the smoke that you fixed?
(vids to come after I get out of chem class so I can reduce them to a manageable size)
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So I ended up making that short exhaust after all. What I was using was just too quiet.
All I used was the flange off a stock downpipe, a little over 45 degrees of 2.5" mandrel bent pipe, and a 2.5" Dynomax Bullet Muffler. It's listed as a muffler, but it's really just a resonator.
I made it the way I did for two reasons. One was sound, as my full length exhaust with the MSA turbo muffler was just too quiet on a turbo motor. The second was ground clearance, as I was tired of scraping all the time on steep driveways and speed bumps. I would have thrown an o2 bung in the elbow, but didn't have a step drill bit handy. It's an easy fix, as the whole thing comes out in as long as it takes you to remove the four nuts.
I drove it to school and back today, and I can say that the noise is totally reasonable. I can hear my radio at it's initial volume at idle, and can hear it while reasonably low at cruise. A 15 minute drive did not cause me any discomfort or annoyance whatsoever. I doubt it's loud enough to draw the attention of the cops, as Harleys and crotch rockets are quite a bit louder.
The Dynomax website lists the bullet muffler as giving a 2-4dB reduction in sound, and I would say that sounds about right. It's a tad bit quieter than when I started the car with no downpipe. The main reason for using it though was the exaust note. It pretty much eliminates the higher pitched overtones that L series engines tend to have through open or semi-open pipes. It also softens the turbo spool noise, as that's high pitched. You can still here it very clearly, but it's not overbearing in any way.
I've also gained almost two inches of ground clearance, as the bottom of the pipe is about even with the frame rails, so it's not ever going to touch anything. It does extend low enough, however, to keep the exhaust gas out of the engine compartment at idle, and you can just faintly smell it at a stop light. I get no fume smell during cruise.
The hardest part was getting it to fit between the tranny and the frame rails. The outside diameter of the resonator case is 4", so it's a tight fit. I have about 2mm between it and the tranny (which is fine because the engine and tranny rotate together), and about 5-7mm between it and the frame rail, which seems to be enough to keep it from hitting as the engine moves on its mounts.
If I end up happy with it, I'll send it off to be ceramic coated. I'm happy with it so far, but we'll see with time if I get tired of it or if it causes any unforeseen problems. I'll post a vid of it later today so everyone can get an idea of what it sounds like.
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Photography is fun..
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This gets my car started with very slight push on the throttle, and it will idle from a cold start after that.
I'm in the same boat as olie. It starts with just a slight push of the throttle, hot or cold, and idles just fine cold, but I cannot get it to start without touching the throttle, hot or cold.
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Hesitations during a pull
in MegaSquirt
Posted
To disambiguate the situation, instead of saying negative vacuum and all of that, lets refer to it in relation to ambient pressure. Your idle is 18-19 inHg below ambient, which is good. You say in your most recent post the sputtering comes in when pressure passes through ambient and raises to pressures above ambient. For our purposes here, this can only happen when the turbo is making boost.
That is saying something else entirely. If you're not under boost (above ambient air pressure) then you're at 0 or below ambient air pressure. So, which is it?