Well i am having problems with my gtx swapped escort gt. I know the wastegate on the vj 20 is small but i can't even stay at stock boost setting. My car has corksport downpipe and custom 2.5" exhaust with fmic. The car boosts to 14 psi and falls back to 10 psi with no boost controller just running off wastegate spring. In third,fourth,and fifth it will boost to 14 psi at 2800 rpms, then hit fuel cut. The wastegate is opening i seen wastegate acuator rod moving. So i was wondering what my problem could be, any input would be so helpful.
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what vaf are you running and have you boost leak tested it?.....with it spiking like that and not staying at stock boost it sounds like a boost leak to me because i had the same problem with it running 14 psi...it was a boost leak it souldn't change if you don't have a boost controller gotta be a leak...... to get rid of the fuel cut i switched from the stock vaf to the code b vaf
1994 Escort GT Turbo
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most people will bore out the wastegate port before they install them, i know i sure did.
sounds like that may be your issue, you have lots of bolt ons that increase velocity and flow, and this dinky wastegate port that's supposed to dump all the extras somewhere.
just my 2 cents-Jack
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91 626 LX - basically stock and pretty slow still
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Really sounds like you need a new wastegate. All these suggestions aren't looking at the main problem. Boost creep is normal but not for a stock wastegate to be boosting 14 and making the car hit cut, unless its cold out. Oh and you'll hit boostcut in the higher gears if you try to get on it too hard in the higher gears. You need to be about 4500 to actually hit on it past 3rd and even second sometimes.Cincinnati, ohio Bengals for life
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I have a b-code vaf and like 4 u-codes it does it with all of them. I checked for boost leaks and could not find any. Im glad to know that other cars hit fuel cut below 4500 in 3rd on up through . Im going to try bomdoutscorts idea and try to find another wastergate. Its awsome how helpful everyone is on here thanks everyone for suggestions.
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please tell me if this fixes your issue, this frequent talk of fuel cut scares me from having a properly runnig car lol-Jack
ONTARIO MAZDA CLUB! Join! https://www.facebook.com/groups/500055016671733/
91 626 LX - basically stock and pretty slow still
http://www.clubprotege.com/forum/sho...my-GD-626-LX-)
01 E53 3.0i - FOR SALE! pm if interested
91 USDM Protege LX - SOLD! turbo/manifold up for sale!
http://www.clubprotege.com/forum/showthread.php?t=46606
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Originally posted by bomdoutscort View PostReally sounds like you need a new wastegate. All these suggestions aren't looking at the main problem. Boost creep is normal but not for a stock wastegate to be boosting 14 and making the car hit cut, unless its cold out. Oh and you'll hit boostcut in the higher gears if you try to get on it too hard in the higher gears. You need to be about 4500 to actually hit on it past 3rd and even second sometimes.
94 Pro LX- 3-hole. Familia seats, Infini Corners, Familia Grille, Familia Rear Garnish w/Rear fogs EDM Glass headlights,
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sweet so i shouldn't have much of an issue for now haha, running the oem LX exhaust with a vj-20 setup.
still going to port the vj-20 out a bit more i think tho...-Jack
ONTARIO MAZDA CLUB! Join! https://www.facebook.com/groups/500055016671733/
91 626 LX - basically stock and pretty slow still
http://www.clubprotege.com/forum/sho...my-GD-626-LX-)
01 E53 3.0i - FOR SALE! pm if interested
91 USDM Protege LX - SOLD! turbo/manifold up for sale!
http://www.clubprotege.com/forum/showthread.php?t=46606
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Same issues here. At about the same RPM's too. With an open exhaust it is normal. I run a B-code VAF and leaned it out to right before it doesn't want to cycle at idle to try and make the ECU see less air flow......and still bounce fuel cut a lot.
If it's any consellation with a VJ-20 and GTX injectors you won't blow anything up.
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