09-05-2018, 11:37 AM | #603 | |
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Quote:
I know Harrop is experimenting with using the bypass valve as a type of "boost bleed" in conjunction with a flex fuel kit (higher boost on E85, lower on gas), but I'm also sure that they are not defeating the low load "open under vacuum" operation to do so. You can probably simply pull (and plug) the vacuum line from the actuator to test how the car reacts. |
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09-05-2018, 12:03 PM | #604 |
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The bypass valve is also there to reduce surging of the compressor. Without it the vacuum at the inlet of the compressor would surge when the throttle plate snaps shut. It's the same reason a blowoff valve extends the life of a turbo.
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09-05-2018, 12:38 PM | #605 |
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I haven't read that specifically, but it could play a part. The major difference is that a turbo is on the front side of the throttle plate and pressure "backs up" against the throttle plate and "rebounds" into the turbo. Where a PD supercharger is behind the throttle plate and "lives" in vacuum when the throttle is closed.
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09-05-2018, 01:13 PM | #606 |
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Don't remove the bypass valve. You'll be making boost at idle if you do. You won't have part throttle, it'll just be boost all the time. It'll be bad for the engine and bad for the supercharger.
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09-05-2018, 01:25 PM | #607 |
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Thanks guys. All that is what I figured, but I thought I read someone had removed the flap to test something.
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09-05-2018, 01:27 PM | #608 | |
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Harrop TVS86 Owners Thread
Quote:
A pure vacuum exerts as much force as 14.7 psi of boost. It's the same situation, the loads are just reversed. |
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09-05-2018, 06:22 PM | #609 |
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My car dry (no gas, passengers, cargo, trunk stuff) is 2750 lbs.
Mods: Half roll cage Harrop SC kit 2 oil coolers Brembo Club Racer 350mm big brake kit Brembo GT rear big brake kit 17x9.5 TE37 heavier varis bumper (its about 3x the weight of the stock bumper) The SC kit can't be THAT heavy...
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09-06-2018, 12:47 AM | #610 | |
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Quote:
Stock car = 2775 - 6gal gas (36lbs) = 2734 - trunk stuff (31.2lbs) = 2702.8 - Volks likely saved ~10lbs = 2692.8 So between all the weight adders you only added ~60lbs. The half cage and supercharger are probably responsible for most of it (let's say 80%). Roll bar might be 20-30 lbs, so the supercharger comes in at about the same. That could mean this setup is significantly lighter than the Edelbrock which is often quoted at 80lbs (60lbs difference when installed, accounting for removed stock parts) |
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09-06-2018, 01:16 AM | #611 |
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http://www.ft86club.com/forums/showp...3&postcount=25
I weighed everything minus the coolant, but the 2.5L equals 5.5lbs, so everything is like 65’ish pounds plus or minus five’ish. I also checked out the front vs rear (my car is on a Eibach Pro Kit), and the front isn’t noticeably different than before, but it might be slightly different. I just can’t tell without talking myself into seeing something that might not be there.
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09-06-2018, 03:48 AM | #612 |
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Just got a corner balance. F:R is 57:43.
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09-06-2018, 10:48 AM | #613 |
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Meaning the front needs a plate or no?
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09-06-2018, 11:35 AM | #614 | |
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09-06-2018, 01:19 PM | #615 | |
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09-06-2018, 02:02 PM | #616 |
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