I have a problem... Bought a used STi Shortblock - Page 6 - Subaru WRX Forum
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#76 Old 03-30-2011, 06:40 PM
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The coating is very nice, and is mostly gray with a slight goldish hue to it under the right light.

-Chris
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#77 Old 04-01-2011, 05:32 PM
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Simply beautiful!

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#78 Old 04-01-2011, 09:14 PM
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Just got back from the drag strip.

I'd say I did ok. I started out with a 8.67 @ 84.xxmph, worked my way down to 8.43 @ 86.xx.

I just need to work on the launch and I could honestly work it into the very low 8's, if not 7's.. My best 60' was a bit above 2 seconds so there is a lot of improvement to be made there. Unfortunately the time slip wasn't working for my best run, so I don't know how my 60' was, or my RT, as this track was actually taking RT into account for ET.

I'm quite possibly hooked, but I'll go every now and then. I'd like my clutch to last a while.

-Chris
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#79 Old 04-01-2011, 09:41 PM
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yeah you should definitely be able to cut that 60' down to about the 1.7-1.8 range with a pretty good launch, IIRC my best using anti-lag was 1.68.

I noticed earlier you went with a smaller tyre, how off is your speedo and what gear were you in crossing the line?

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#80 Old 04-01-2011, 09:49 PM
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I was pretty much topping out 3rd gear at the end of the 1/8 th. I had maybe 3-400 rpm's left before I hit 7k. Tires are about 1/2" shorter than stock so my spedo is off by about 1%.

-Chris
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#81 Old 04-03-2011, 01:12 PM
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Mosc's info was really good on the tires. Are you using LC or feathering the clutch? I'm jealous that you're already getting out to the track. . .

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#82 Old 04-03-2011, 01:46 PM
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My best time I held at 4k and feathered out the clutch until I got full engagement.

I will say I've never felt my car so fast with the way it hooks up on a prepped surface. Barely any wheel spin and no issues with the clutch so it was all go.

-Chris
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#83 Old 04-06-2011, 08:06 PM
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So I got my car datalogged to see how it was running.....

Started knocking at 4500, had a few events push 9.5* of timing... I immediately had him retune it lol.

I had 93 in the tank at the time and it's easy enough to find out here, so I had him tune it on 93. At least now I know the car is running safe and probably picked up a bit of power in the process.

-Chris
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#84 Old 04-06-2011, 09:03 PM
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You'll enjoy the 93 tune some, I bet.

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#85 Old 04-06-2011, 09:18 PM
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Seems to be a bit quicker already.... Not a, yeah I think it's a bit quicker, but oh yeah that has more punch to it.

Just some details.

Previous map was targeting 19psi and was hitting about 20.5-21 psi, IDC's were at 98% (previously at 87% at elevation in Utah). Now I'm targeting 18psi, IDC's are at 94%, we were able to run more timing across the board once he smoothed out the timing curve to get rid of the knock. We went with 18psi because I told him to keep IDC's in the low 90's.

Moral of the story: if you drive your tuned at 4200' car at <1000', at least get it logged to make sure it's happy, and probably retune it.

-Chris
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#86 Old 04-06-2011, 10:44 PM
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Good advice. Good work on pulling the boost to decrease the IDC. While I was reading that, I was moderately concerned. I should have known better than to think you would do such a thing.

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#87 Old 04-07-2011, 08:32 AM
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New Airboy Plot: Same car, same parameters. Changed elevation from 4200 to 950, tire size from 225/45 to 235/40/17, and extra weight in car to 520 from 420 (me at 140 him at 300, little over half tank at 60, my computer/work stuff and his computer stuff 20.

According to Mr. Airboy I picked up 33hp and 32 lb-ft of torque with 93.


-Chris
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#88 Old 04-28-2011, 02:32 PM
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Well in about a month I'll be doing a bit of work on the car.

First and foremost is the 30k service so Trans Fluid, Rear Diff Fluid, Bleed the brakes, new cabin air filter and an oil change. I'm at 31k right now but I don't move into my new place with the garage and get my tools out here until the beginning of June.

With that I'll be doing the Group-N Engine mounts and DW300 Fuel Pump. I'm not sure if I'll put the pump in or not but I'll do it if I get bored.

I'm still on the fence about going to E85 this summer or not. If I do, I'm taking the chance that my clutch will give out with the new found torque. At the same time I really want to go to E85. I'm still torn over what injectors to get as well.

ID1000 EV14's - tried and proven, but will most definitely limit the eventual Dom3xt-r on E85. $450 with pigtails.

Five-0 1200cc EV14's - less known about them, some guys have issues others rave about them. Perfect injector setup for my future Dom3xt-r on E85. Only cost $360 no pigtails required.

ID1600's - again tried and proven, but way overkill even for EV14's. Driveability may suffer and they cost $900+ with pigtails.

-Chris
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#89 Old 04-28-2011, 03:43 PM
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You have to keep in mind the capabilities of your fuel pump too when you talk about that large an injector.

Assuming you have a walboro 255 like most of us, that's 255 liters per hour, or 255,000 cc's per hour, or 4166cc's per minute, or 1042cc's per injector on a 4-cylander per minute. In other words, a walboro 255 fuel pump cannot supply enough fuel to feed 4x 1200cc injectors. More realistically, fuel pumps aren't designed to work at 100% capacity either. The maximum flow capabilities also vary with how much gas is in the tank, etc. In tank fuel pumps are somewhat limited. If you are seriously considering injectors >850cc, you should be looking into a dual fuel pump setup or preferably a fuel cell.

The stock 02-05 WRX fuel pump is about 140lph and was paired with 440cc injectors. This is about a 75% fuel pump utilization at 100% injector duty cycle. The STi fuel pump is about 180 lph and was paired with 560cc injectors. That's also 75%.

Holding Subaru's 75% usage in mind, a 255 fuel pump should be good only to 780cc and a 300 lph pump would be 940cc. I think you can push it a little beyond that because we generally don't want to run our injectors at 100% either, but I wouldn't go much beyond 75%. A 300lph fuel pump would work fine with 1000cc injectors but I wouldn't go beyond that.

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#90 Old 04-28-2011, 04:34 PM
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If I get the 1200's it's because I want to cap IDC's at 90%. 1000's can supply the fuel for the power I want at 90%, 1200's can.

.9x1200x4x60= 259,200 cc's per hour which is 259 lph. I'm using the DW300 pump which actually flows closer to 310lph at 43.5psi. It flows 250lph at 70psi which is pretty much what the walbro can do at 43.5.

As for right now, I'd expect to see around 55-60% IDC's on 1200cc injectors and a VF52 on E85 wich only requires about 172lph of fuel.

If I were to extract every ounce of power the Dom 3 can produce my fuel needs are somewhere around 1150CC's on E85. If I were sticking to pump fuel 1000's would be just fine, but I'm adding in an extra 30% for E85 (which is high but on the safe side). This would be about 96% IDC's on the 1200's.

Combine the 10% IDC margin of safety and a more likely 20-25% increase in fuel demand for E85 and 1200cc with the 300lph pump should fit the bill nicely.

-Chris
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