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Title: boost spike??
Post by: Simaroon on May 06, 2011, 06:35:57 PM

i know its been covered, its a noob question and ive searched it to death, but it just keeps showing very recent posts with boost spike just mentioned.

ive just put an exhaust on, kept the cat, but have not got a boost gauge or apexi fc + commander; so just wanted to keep an eye out for/be aware of what to look for/feel regarding boost spike just incase.

thankings you for any help :3gears-rh

Title: boost spike??
Post by: HaywardRotary on May 06, 2011, 07:24:11 PM

Boost spike is when you make mods such as you have done and the engine over boost\'s,if it goes to high then you can run lean.
A sure sign that you have overdone it is when the car under boost abrptly stops for a second almost throwing you through the windscreen,that is boost cut when the ecu say\'s it has seriously over boosted and temporarily cuts fuel.
Be careful when modding exhaust and inlet as your engine maybe running lean with stock ecu and can pop the engine.
Regards
Carl

Title: boost spike??
Post by: Simaroon on May 06, 2011, 07:31:27 PM

thanks for the reply, yes im aware of the issues with adding mods without changing the ecu, but from what ive read, the general idea is if i keep the cat it should be ok??? hopefullly :) i am still running standard airbox and filter to.

so if i did happen to get boost spike, it would be a serious jolt and easily recognisable?? or could it just be a dip in boost which might be hard to notice?
i know i should be getting a boost gauge !

im used to a 200sx so the twin turbo feel throws me a bit.

Title: boost spike??
Post by: HaywardRotary on May 06, 2011, 07:32:35 PM

Some cars with cats still do it and still run lean so be careful.

Title: boost spike??
Post by: neil_jdmr on May 06, 2011, 09:37:12 PM

Boost gauge is a must even a Â£10 one from fleabay will do instead of nothing

Title: boost spike??
Post by: wolfie1 on May 07, 2011, 12:10:09 AM

i have just installed an apexi filter kit onto my 94 fd is there a chance of this happening to me?, it has been on for 2-3 days now and it appears to be running ok

Title: boost spike??
Post by: HaywardRotary on May 07, 2011, 10:12:59 AM

Quote from: wolfie1;760727i have just installed an apexi filter kit onto my 94 fd is there a chance of this happening to me?, it has been on for 2-3 days now and it appears to be running ok

Usually but not exclusively a filter kit and back bax are the most you can do without issues.
Just have noticed on some that even a back box can over boost.
Regards
Carl

Title: boost spike??
Post by: wolfie1 on May 07, 2011, 11:16:03 AM

thanks, i was starting to worry about possibilly blowing my engine with it!

Mazda Rotary Club

General => General Technical => Anything Engine/Performance/Tuning related => Topic started by: Simaroon on May 06, 2011, 06:35:57 PM