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Old 01-20-2018, 03:55 PM   #41 (permalink)
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Been experimenting with P&G on my commute as opposed to DWL, and have had some nice runs... my UG doesn’t consistently pick up my EOC(doesn’t always go to 999.9mpg but sometimes only to 130-150 or so) but I’ve had some commutes averaging in low forties with temps near freezing... my grille blocking has kept intake temps about 15* above ambient, with the added benefit that heat soak(from sitting) takes far longer to dissipate, yielding better mileage from that as well...

It’s having some idle issues from an oily TB and IACV (i assume) but I’ve got a ported/polished TB with freshly cleaned IACV I’m planning on swapping on soon, as soon as I finish my intake tube and decide whether or not to port my spare intake manifold...

Does intake tube size matter? TB is 2.75” and I was gonna either do 3” or 4” intake tube(with water vapor induction) air box lid was oval outlet but reformed and about same as 3” pipe... my thought was that the 4” to 2.75” would build velocity and help torque, but with the air box lid being 3”, maybe I’d see no further benefit from the 4”?

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Old 01-22-2018, 01:10 PM   #42 (permalink)
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4" is not going to gain you anything. If anything, I'd go smaller. It should increase velocity and while it may choke at high rpm & load, at lower rpms you may see a small torque increase (which can also lead to a FE bump).
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Old 01-22-2018, 05:25 PM   #43 (permalink)
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Given that I experienced about a 3% gain from going to a 3" intake tube on the Malibu I had I'll likely just go 3"... It'll save me about $1.50 all together on the silicone couplers too... I'll try and get enough exhaust tubing to make two pipes, one to use plain and one to add the water vapor venturis to... I might be able to ABA test a mod for once!
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Old 01-27-2018, 01:06 AM   #44 (permalink)
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So I’ve received my couplers and fabricated my intake tube out of 3” stainless steel exhaust tubing(freebie)... my design mimics the GMPP short ram intake design, in that it uses the factory airbox... other L61 drivers have reported gaining 8-10whp from an intake and I remember about a 3” gain in FE on the Malibu and it’s intake wasn’t designed as well... for the total of $22 I have in doing a 3” intake and ported TB(same bore size but with smoother size transitions) I can’t complain...

EDIT: guess I should mention I’m not doing water vapor at the moment... I guessed wrong on the intake tube length and it’ll be uncomfortably short to drill for the vapor tubes; they’d be too close to the IAT sensor...
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Old 01-28-2018, 05:44 AM   #45 (permalink)
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So I installed all my intake stuff yesterday... I've now got a short ram intake and ported throttle body, and NO PCV gases going into the intake... The car seems a little more responsive, and maybe a little more power above 3500 RPM... Low end seems about the same so far, or at least no significant change... IATs seem to be higher with this intake compared to stock, so there might be a mileage boost, but it's too early to tell at the moment...

Given that I was a little conservative with my TB porting, I considered doing a more aggressive port job on the original one and putting it on...
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Old 01-30-2018, 11:21 PM   #46 (permalink)
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I figured I'd post a more detailed analysis of my mod... Torque from 9-1200 RPM was reduced some, but from around 1400-2000 seems to have been improved slightly... As a result, I can't quite use 5th gear in town as much as before due to the one hill I can't climb anymore, but going from 40-60mph in 5th seems smoother... 80% loads comes up at a lower throttle percentage, so in warm-ish weather I can now accelerate (pulse) at around 20mpg instant versus around 18.9-19.4...

Acceleration seems to have been improved a little from 4000 RPM and up, but since I don't use this rev range much it doesn't matter much... Throttle response seems a little crisper, but these mods didn't drastically transform my car or anything, it still drives much the same as before...
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Old 01-31-2018, 09:20 AM   #47 (permalink)
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How did you go about testing the increase/decreases that the intake provided?
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Old 02-03-2018, 10:33 AM   #48 (permalink)
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In all honesty, my verdict is purely a guess based on how the car behaves on my commute... the loss of TQ below 1200 RPM was asked on a hill in Glenville that I used to climb in 5th by starting at 28 mph and at the top I would be going 25... now if I’m not above 30 at the bottom, I can’t crest at 25 without going back to 4th... oddly enough it has enough TQ at 32 to crest at 27mph...

The gains above 1500 RPM were based on the Hill out of Glenville that I can now climb in 5th by starting at around 42-45mph depending on traffic... before, I would start in 5th at around same speed but about 3/4 way up I would have to go back to 4th due to speed loss(less than 35 on that hill)... now I crest at 39-40 in 5th
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Old 02-14-2018, 05:45 AM   #49 (permalink)
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IGL - '04 Saturn Ion
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I’m currently working on my next mod, smooth wheel covers... I took off the factory ones and am using strapping tape(same stuff I use for grille blocking) to fill in the holes... I’m trying to go for a OEM(ish) look, so the centers and lug holes are uncovered...

Oddly enough I’ve not found any major difference between stock wheel covers and none at all(as far as coasting)... maybe smooth will be massively better?
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Old 02-18-2018, 03:36 PM   #50 (permalink)
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IGL - '04 Saturn Ion
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90 day: 56.19 mpg (US)
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I figured out some image hosting and figured I’d show off my grille block... the salt accumulation shows off how much has been blocked...

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