odd boost issue (searched, found nothing)
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odd boost issue (searched, found nothing)
I did a search both on the net and on the forum and couldnt find anyone with this paticular problem and im not sure where to start diagnosing it, im going to do the whole troubleshooting thing top to bottom this week but in the meantime i was hoping to get some ideas on where to pay extra attention.
heres the backround, the car had an engine fire on the drivers side (lhd) of the bay, replaced EVERYTHING except the block and the twins as the passenger side of the car was untouched by the fire, before the fire boost was perfect 10-8-10
well, got it running and its doing great except im having an issue with the secondary turbo,
1/4th of the time i will loose all boost after the transition, boost is between 8 or 10 then just falls off entirly to 0 or 1 psi when it start to transition.
the rest of the time it will really act up after the transition it will bounce around really hard then settle down and overboost (imagine a tach needle bouncing on the revlimiter thats about what it looks like) almost as if its struggling to regain presssure with the secondary, also makes an odd.. pulsing, hiss while its bouncing.
boost pressure looks like (durring 4th gear freeway pull)
10-8-6-8-9-8-10, then smoothly overboost to 12 before i lift off.
mods are as follows,
apexi intake filters, large SMIC, purplebox ecu, mbc (replaced wastegate restricter pill with bleed valve), downpipe, stock cat, magnaflow weld in muffler, greddy intake elbow.
car is an auto.
any thoughts?
heres the backround, the car had an engine fire on the drivers side (lhd) of the bay, replaced EVERYTHING except the block and the twins as the passenger side of the car was untouched by the fire, before the fire boost was perfect 10-8-10
well, got it running and its doing great except im having an issue with the secondary turbo,
1/4th of the time i will loose all boost after the transition, boost is between 8 or 10 then just falls off entirly to 0 or 1 psi when it start to transition.
the rest of the time it will really act up after the transition it will bounce around really hard then settle down and overboost (imagine a tach needle bouncing on the revlimiter thats about what it looks like) almost as if its struggling to regain presssure with the secondary, also makes an odd.. pulsing, hiss while its bouncing.
boost pressure looks like (durring 4th gear freeway pull)
10-8-6-8-9-8-10, then smoothly overboost to 12 before i lift off.
mods are as follows,
apexi intake filters, large SMIC, purplebox ecu, mbc (replaced wastegate restricter pill with bleed valve), downpipe, stock cat, magnaflow weld in muffler, greddy intake elbow.
car is an auto.
any thoughts?
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Last edited by reverus; 10-17-11 at 09:43 AM.
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I hate to go non-sequantial on an auto but.. ya.. im thinking i might have to
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#8
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Well I am tired of the heat soaked solenoinds so I am biteing the bullet and going this route so I can maintain the sequential system.
https://www.rx7club.com/group-buy-product-dev-fd-rx-7-269/custom-solenoid-rack-968956/
https://www.rx7club.com/group-buy-product-dev-fd-rx-7-269/custom-solenoid-rack-968956/
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