boost to 5psi and thats it! again !!!
10-26-04, 09:22 PM
#1
boost to 5psi and thats it! again !!!
I got the turbo back from the machine shop and man did they do a damn good job for never doing that kind of thing before. They welded some peice of metal on there that they said they use for things that get very hot so the flapper won't warp etc... it looks great! Anyways I put everything back together including putting all my piping on for my old school trust intercooler and I had to make a new tid because the old moded one I had would not fit with the piping in the way. Well after I did all that and got it ready to run I start the car up and everything seems fine. After letting it warm up for a while I take it for a drive and it boosts great! but when I let of the gas peddle it goes to 3k rpm 
so I went back to the house and looked under the hood to see if the throttle cable was hanging somewhere but it wasn't so I put the hood back down and went to go drive up in the carport however as soon as I reved it again it fell back down to 800rpm and steady! so I took it out again however this time I only got 5lbs of boost and no more. I turned my profec-b up however it still stayed at 5lbs. but idled great! What do you guys think is going on????
so I went back to the house and looked under the hood to see if the throttle cable was hanging somewhere but it wasn't so I put the hood back down and went to go drive up in the carport however as soon as I reved it again it fell back down to 800rpm and steady! so I took it out again however this time I only got 5lbs of boost and no more. I turned my profec-b up however it still stayed at 5lbs. but idled great! What do you guys think is going on????
10-26-04, 10:23 PM
#6
lol, thanks wayne I appreciate the moral support 
anyways I'll check to see if the wg is stuck oppen tomorrow. How would this happen??? Also what do you guys think the deal is with it reving to 3k rpm but boosting fine and then when it idles fine it only gets 5psi??? also maybe for now I should take out the profect-b all together just for now.....yeah I think thats what I'm going to do. Anyways the profect b is installed correctly however it maybe to far from the turbo because its mounted on the passenger side fire wall and then lines are run to the turbo however this all happend with the boost controller turned off. Thanks.
oh yeah when I first started the car up it wasn't quite as fast spooling as it was with the tmic of course however the bov would sound and I would get great boost however with only 5 psi of boost no more bov would sound and it barely felt like I had boost. Also once when I was only getting 5psi it jumped up to 10psi 11 and then 12psi and then I let off and tried it again and then it just went to 5 again. Strange ****
anyways I'll check to see if the wg is stuck oppen tomorrow. How would this happen??? Also what do you guys think the deal is with it reving to 3k rpm but boosting fine and then when it idles fine it only gets 5psi??? also maybe for now I should take out the profect-b all together just for now.....yeah I think thats what I'm going to do. Anyways the profect b is installed correctly however it maybe to far from the turbo because its mounted on the passenger side fire wall and then lines are run to the turbo however this all happend with the boost controller turned off. Thanks.oh yeah when I first started the car up it wasn't quite as fast spooling as it was with the tmic of course however the bov would sound and I would get great boost however with only 5 psi of boost no more bov would sound and it barely felt like I had boost. Also once when I was only getting 5psi it jumped up to 10psi 11 and then 12psi and then I let off and tried it again and then it just went to 5 again. Strange ****
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10-27-04, 09:29 AM
#9
Despise Enmity
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1. When does it spool?
2. When does it boost in RPM?
3. Have you tried running a line from the compressor housing source to the wastegate actuator bypassing the boost controller yet?
4. Is ANYTHING else T'd into the line between source, controller, and actuator?
2. When does it boost in RPM?
3. Have you tried running a line from the compressor housing source to the wastegate actuator bypassing the boost controller yet?
4. Is ANYTHING else T'd into the line between source, controller, and actuator?
10-27-04, 09:55 AM
#11
Locust of the apocalypse
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you problem is two fold..... I had the same problem... the profec-b is letting too much of a volume of air past it before the solenoid reacts. I do not think they were designed for use with a 5-lb wastegate spring...
go get a .030 welding tip, cut it in half sand out the rough edges and then stick the half with the threads on it in your line that goes from the profec b solenoid to the wastegate and zip tie it fast.
And turn your boost setting down before you take it out!
As for the high idle... your throttle plates themselves could be sticking open or the BAC could be hanging up.
Make SURE that all your IC lines are really friggin tight.. I have t-bolts that are a size to big and i have to replace them with smaller ones cause they are not sealing tight enough and they are at full turned in.
go get a .030 welding tip, cut it in half sand out the rough edges and then stick the half with the threads on it in your line that goes from the profec b solenoid to the wastegate and zip tie it fast.
And turn your boost setting down before you take it out!
As for the high idle... your throttle plates themselves could be sticking open or the BAC could be hanging up.
Make SURE that all your IC lines are really friggin tight.. I have t-bolts that are a size to big and i have to replace them with smaller ones cause they are not sealing tight enough and they are at full turned in.
10-27-04, 12:01 PM
#15
Seduced by the DARK SIDE
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Maybe trace the hoses & look for a spot that could kink or pinch under stress.
I had an alternator belt turn inside out.
The belt was bad. It happens.
A good belt will not do that.
I had an alternator belt turn inside out.
The belt was bad. It happens.
A good belt will not do that.
Last edited by SureShot; 10-27-04 at 12:03 PM.
10-27-04, 12:08 PM
#16
thanks man, I've got to get my dual alternator pully on and then get two new belts before I even think about taking it out again. I don't think this could have caused the low boost but could have messed something up due to slipping 
Hopefully not though. I'm going to take off my boost controller and just see if the ebc is the culporate but its kind of strange how it worked fine, boosted to about 12 or 13psi every time and then bamn not any more.
Hopefully not though. I'm going to take off my boost controller and just see if the ebc is the culporate but its kind of strange how it worked fine, boosted to about 12 or 13psi every time and then bamn not any more.
10-28-04, 04:20 PM
#17
well just got another alternator belt and threw it on and took my ebc off and hooked it like stock however still only 5psi!!!! What else would you guys try when looking for this problem??? I've checked to make sure all my piping couplers are tight and they are I also made sure any caps that I have on the ic are still tight and they are. I'm at a loss! Any help would be great! Thanks.
edit: if it was a vac leak it would idle funny right??? This has a solid and I mean the best idle this car has ever had 800rpm idle. Thanks.
edit: if it was a vac leak it would idle funny right??? This has a solid and I mean the best idle this car has ever had 800rpm idle. Thanks.
10-28-04, 04:49 PM
#18
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if you took your ebc off and have a ported wastegate its a good thing your only hitting 5psi, as far as the idle, take off all the junk before your throttle bodies then have someone (with the car off) push the gas pedal back and forth to see if it is sticking
10-28-04, 05:15 PM
#19
yeah my wastegate is ported with a new flaper welded on, why is it a good thing its only hitting 5psi??? I'll check tomorrow if its getting stock. It's so wierd though this just started happening. I took it out last night and it boosted great but had a damn high idle then I stopped it looked under the hood and took off again and after that the idle was great but the boost sucked???
10-28-04, 05:30 PM
#21
Stock S4 turbo wastegate is 5.5psi. If you put it back to stock, it should be hitting and holding 5.5psi, especialy since you had your wastegate ported. (No boost creep)
Did your engine bay get wet anytime recently? You can kill many things under the hood with water, esp the boost controller solinoid. Sounds like your boost controller is either bad, or you need to do the welding tip restricter pill trick.
Did your engine bay get wet anytime recently? You can kill many things under the hood with water, esp the boost controller solinoid. Sounds like your boost controller is either bad, or you need to do the welding tip restricter pill trick.
10-28-04, 05:38 PM
#23
Ok lets get this clear.
You got the car back. You were driving it. It was boosting just fine at 10-12psi and suddenly quit working. Now with the EBC installed, it will only hit 5psi. Or will it hit no boost? It sounds like your boost controller just died, because if its only running the stock 5psi- its stuck open and only allowing stock boost.
You got the car back. You were driving it. It was boosting just fine at 10-12psi and suddenly quit working. Now with the EBC installed, it will only hit 5psi. Or will it hit no boost? It sounds like your boost controller just died, because if its only running the stock 5psi- its stuck open and only allowing stock boost.
10-28-04, 05:49 PM
#24
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No, it sounds like the bc is hooked up incorrectly. This all happened AFTER you put the ported gate with welded flapper back in, right? With the gate ported that way, you will only get stock boost without a bc. Go over the installation again...
10-28-04, 08:25 PM
#25
now wait a minute how would I get stock boost if:
1. when people get straight through exhausts and custom tids they need a fcd to stop fuel cut because they are boosting to at least 10psi??? I know that s5's are differant because of their onboard bc but with an 88 it should just boost that high withought having any boost controller at all. and this is what I tried today (unhooking any boost controller and making it stock) still only 5psi. also the ebc is installed correctly with the in going to the inlet of the turbo and out going to the wastegate.
Ok here is what happend I got my turbo back from the machine shop and put it back together and went for a test drive. At first the car was boosting great but had a high idle like if I reved to 6k it would come down only to around 3k, if I reved another time it would go down to about 2k. so I was like damn must be throttle cable or something so I got out will the car was still on and opened the hood and played around with the throttle cable. After I did this I dropped the hood put it in first and started driving this time with great idle yet only 5psi of boost.
1. when people get straight through exhausts and custom tids they need a fcd to stop fuel cut because they are boosting to at least 10psi??? I know that s5's are differant because of their onboard bc but with an 88 it should just boost that high withought having any boost controller at all. and this is what I tried today (unhooking any boost controller and making it stock) still only 5psi. also the ebc is installed correctly with the in going to the inlet of the turbo and out going to the wastegate.
Ok here is what happend I got my turbo back from the machine shop and put it back together and went for a test drive. At first the car was boosting great but had a high idle like if I reved to 6k it would come down only to around 3k, if I reved another time it would go down to about 2k. so I was like damn must be throttle cable or something so I got out will the car was still on and opened the hood and played around with the throttle cable. After I did this I dropped the hood put it in first and started driving this time with great idle yet only 5psi of boost.
Last edited by hondahater; 10-28-04 at 08:27 PM.