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Author Topic: Boost Spiking?  (Read 1317 times)

greywolf27030

  • Old-Timer
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  • Posts: 686
    • 88 Festiva, 91 Capri, 91 XR2
Re: Boost Spiking?
« Reply #15 on: March 01, 2017, 10:43:29 AM »

Wow, that's cool.  I guess porting it is limited by the size of the flapper door?  Thanks SHO

Jack Byrd
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Rocketman

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  • Old-Timer
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  • Posts: 4990
    • 91 BPT AWD Capri & 1991 XR2
    • http://www.werbatfik.com
Re: Boost Spiking?
« Reply #16 on: March 02, 2017, 12:43:00 AM »

Wow, that's cool.  I guess porting it is limited by the size of the flapper door?  Thanks SHO

Jack Byrd

Yep.

And I have seen people take off the stock flapper and weld in place the business end of an old exhaust valve to gain a larger area. Probably more than is needed for a VJ14 based turbo, but, ya know  ;D
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


frog

  • Newbie
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  • Posts: 13
    • 93 xr2 & 91 N/A
Re: Boost Spiking?
« Reply #17 on: March 03, 2017, 08:06:03 AM »

The way I got around the spike was had a 2" exhaust from the stock down pipe added. the larger exhaust just were the down pipe makes a bend under the motor. I really noticed an increase in power out put and no spike. I think this holds the turbo from spooling to quickly until the motor can accept the air flow.I hold a steady 16 psi.
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alldsben

  • Newbie
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  • Posts: 17
    • 91 XR2 91 Miata 04 S10 89 Mustang
Re: Boost Spiking?
« Reply #18 on: March 12, 2017, 06:50:35 PM »

Ended up finally fixing my intercooler leaks and boost spiking. the only way i was able to fix my spiking was by removing my mbc. i have a feeling that is because how restrictive it was but i do not know for sure.
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azgtx

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  • Posts: 548
Re: Boost Spiking?
« Reply #19 on: March 12, 2017, 08:09:54 PM »

Ended up finally fixing my intercooler leaks and boost spiking. the only way i was able to fix my spiking was by removing my mbc. i have a feeling that is because how restrictive it was but i do not know for sure.

So now you have no boost control?  And you must have the oem fuel cut disabled if you are seeing 13-14 psi correct? I would be careful there.
« Last Edit: March 12, 2017, 08:14:13 PM by azgtx »
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alldsben

  • Newbie
  • *
  • Posts: 17
    • 91 XR2 91 Miata 04 S10 89 Mustang
Re: Boost Spiking?
« Reply #20 on: March 13, 2017, 04:44:38 PM »

It would cut out when it would spike that high

Ended up finally fixing my intercooler leaks and boost spiking. the only way i was able to fix my spiking was by removing my mbc. i have a feeling that is because how restrictive it was but i do not know for sure.

So now you have no boost control?  And you must have the oem fuel cut disabled if you are seeing 13-14 psi correct? I would be careful there.
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