Thread: Boost curve

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  1. #1 Boost curve 
    SE Level Member chrisrexmandie's Avatar
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    Does anyone have a data log that they have a cam and ported heads? Im curious if your boost will slowly creep higher with rpm or if it stays flat up to redline.
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  2. #2 Re: Boost curve 
    Killa Bee Scottydoggs's Avatar
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    boost will build with rpm's. you wont see max psi till red line. or your shift points.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: Boost curve 
    GrandPrix Junkie SgtMarshal's Avatar
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    I looked at a scan from 2017 and my boost level hits close to max pretty quick. the car is gone now and I don't remember what mods I had on at that point.

    but I do know that I had ported heads and an XP cam at that point.
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  4. #4 Re: Boost curve 
    SE Level Member chrisrexmandie's Avatar
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    I only ask because in theory the supercharge should be moving the same amount of air regardless of speed. So for the boost to increase with rpm I can only imagine it is because of a restriction in flow of the heads or exhaust. Unless im missing something...
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  5. #5 Re: Boost curve 
    Killa Bee Scottydoggs's Avatar
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    the blower is rpm dependent. more rpm's the faster the blower spins, thus more boost with more rpm.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  6. #6 Re: Boost curve 
    Killa Bee Scottydoggs's Avatar
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    ive got a paxton on my 5th gen camaro. at 6300 it makes 6.7 psi. at 6700 it makes 7.5. seen this on my scans with hpt.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  7. #7 Re: Boost curve 
    GrandPrix Junkie SgtMarshal's Avatar
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    mine was with an HP Tuner scanner as well. your paxton doesn't make peak boost like an Eaton M90 because it's centrifugal. roots/pd blowers hit close to max boost much faster than centrifugal.
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  8. #8 Re: Boost curve 
    Killa Bee Scottydoggs's Avatar
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    its still instant power off the line. belt driven turbo really.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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