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Cut's Out After Running Into Boost?

ttoks

By ttoks,
in Engines & Forced Induction

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ttoks

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g'day all, well i finelly found a GTR in my price range, in the condition i want and with the mods i want, before plunging in and buying it though there is an issue that i dont know how big or small it is, basicly when you run into boost and rev it out (say up to 6-7 grand) and let of the throttle, the ignition cut's out and wont respond again until the key is turned off and back on, the current owner say's he reinstalled the stock airbox and a set of tomie blow off valves without retuning the car, also it's still running the stock AFM's at around 310 awka.

is this thing a time bomb, or is this a case of a good tune to fix?

the car is running forged internals, a power FC, 2860-5 turbo's on 17.5 psi (owner say's there's also maps for 19 and 14.5 psi) unkown brand 660cc injector's (part number is , splitfire coilpacks,as well as a few others pieces.

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ttoks Collaborator

ttoks

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310awkw with stock AFMs? Sounds like a hand grenade to me.

Get it checked by a professional.

would it be a case of simply getting some Z32's, or nismo AFM's and getting it tuned to fix the problem, or has the fact it's been run with stock afm's mean the damage is already done?

ttoks Collaborator

ttoks

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Yea but what do you mean by the ignition cuts out?

Pfc does not have any sort of protection???

by ignition cuts out i mean the engine will not respond, after letting off the throttle on boost at around 6-7k rpm and try to get back on the throttle theres nothing, all the dash lights, ect still work, indicators, headlights ect, turn the key off, push the clutch in and restart the engine while rolling and it's fine again until you give it another squit into boost and heavy load.

R31Nismoid Grand Master

R31Nismoid

Posted
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There are "maps"?

Unfortunately no there aren't. The PFC is a single map, it doesnt have dual map.

Either way as others have said, get it checked by a professional.

You are rushing into all of this in the wrong way as per your other thread.

Stop, read, learn - then do.

ttoks Collaborator

ttoks

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There are "maps"?

Unfortunately no there aren't. The PFC is a single map, it doesnt have dual map.

Either way as others have said, get it checked by a professional.

You are rushing into all of this in the wrong way as per your other thread.

Stop, read, learn - then do.

i dont feel as i'm rushing, i'm looking at car's, reading on here and asking questions, however i find it very difficult to learn by just reading, i cant picture what i'm looking at without actually seeing/touching/feeling it, i much prefer to see what i'm learning about in front of me, i've been lurking on here for a few months but it's only been since i started looking at car's in the flesh that i feel i'm starting to get a bit of an understanding of these beast's.

ttoks Collaborator

ttoks

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are the tomei bovs venting to atmo?

yes to atmosphere

and to the above post i havnt actually looked at to many car's, i looked at 3 yestorday, 2 r32's and a stock r33, being as i normaly work 12 hour shift 13 days a fortnight (at this time of year) it's hard to get time to drive to the big smoke to look at car's, i live in gippsland (2 hours east of dandenong)

Edited by ttoks
tricstar Mentor

tricstar

Posted
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yes to atmosphere

and to the above post i havnt actually looked at to many car's, i looked at 3 yestorday, 2 r32's and a stock r33, being as i normaly work 12 hour shift 13 days a fortnight (at this time of year) it's hard to get time to drive to the big smoke to look at car's, i live in gippsland (2 hours east of dandenong)

OK that make it quite a long process,

I'm in perth and I got one from melbourne and one from adelaide, you might not find what your looking for in your town, I found the cost of going interstate was more than offset by the saving on the car.. but it sounds like a time thing a thumbsup.gif

Moodles2 Grand Master

Moodles2

Posted
Posted

310kw with -5's at 17.5psi..... it should be making more power than that, you would expect 330-350

If there really is a "19 psi map", that means the owner put 350-370kw of power through a pair of stock AFMs that will only support 300-310kw max. Sure you can tune around them slightly, but not that much

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