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Forced Induction Turbo, Supercharger, Methanol, Nitrous |
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01-09-2020, 01:53 PM | #43 | |
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01-10-2020, 02:10 AM | #44 |
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Boost is linear, no boost leaks
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01-10-2020, 02:11 AM | #45 | |
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01-10-2020, 01:11 PM | #46 |
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That number isn’t bad for your fuel and compression ratio. By “98 pump gas” you mean it is 98 RON, equivalent to our 91 octane in the states, right? These guys made similar power on the HBP, which is what you are hitting.
Did you do a larger intercooler too when going with this pulley? What’s your IATs? I’m just wondering if you are getting heat soak. Can you do a boost leak down test too?
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01-10-2020, 01:46 PM | #47 |
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98 ron is decent fuel here, more like 92oct
95ron is the shitty 91oct |
01-11-2020, 04:48 AM | #48 | |
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Did a boost leak down test and all good there.
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01-11-2020, 10:13 AM | #49 |
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I have had very similar experience with the HBP and only seeing no more than 9.3 psi. I get that psi isn’t everything but like you that large of a drop in observed vs marketed pressure is very concerning at worst and interesting at best.
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01-11-2020, 10:43 AM | #50 |
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RS pulley with high compression and 93 octane gas is not practical for street/daily setup. It only makes sense with lowered compression and/or race gas. To me, it only makes sense for a track dedicated race car with a built engine. I don't think tjis is just a Rotrex limitation. Even a turbo or PD pump will be unpractical to go far beyond 300 hp for a street setup since this is a 2L 4 cylinder engine after all. PD or turbo can feel faster on the street and drag strip due to low rpm torque but not on the track.
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01-11-2020, 12:35 PM | #51 | |
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01-11-2020, 01:03 PM | #52 | ||
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If everything is dialed in perfect then perhaps there is just a drop in pressure across the IC or drop in resistance in your system. It is only reasonable to assume that two engines pushing a supercharger the same rotations or amount of air with the same timing advance will produce the same power, but if one has less compression then that one will make less power. Here is your problem: https://jacksonracing.com/product/fr-sbrz-rs-upgrade/ Quote:
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01-11-2020, 01:52 PM | #53 | |
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Edit: I was checking how to make most power with a 4 cylinder engine and I found M139 2L 4 cylinder engine at 400+ HP. - 30 psi twin turbo - 9:1 compression - special electric water pump - closed deck extra strong block and other components I did not see the exhaust manifold, camshaft, valve train design, but those should be extra special too. So it is possible ... Last edited by mrg666; 01-11-2020 at 04:55 PM. |
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01-11-2020, 06:04 PM | #54 | |
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https://www.evolutionm.net/forums/ev...our-stuff.html Yes, Top Fuel drag cars use race fuel, but nevertheless, they often have even lower compression like 6.5:1. In theory, the lower the compression then the higher the effective compression ratio can be. The trade off is lag and efficiency. Some drag cars use nitrous and anti-lag to fill the void left by low compression.
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01-11-2020, 07:03 PM | #55 | |
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01-12-2020, 12:01 AM | #56 | |
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