datsun280zx81 Posted January 25, 2007 Share Posted January 25, 2007 After running the engine hard I have had what appears to be a boost problem. When full boost is obtained the engine cuts back to no power, almost idle speed. If the turbo spools up and is running at partial boost then there is no problem. Any suggestions? Quote Link to comment Share on other sites More sharing options...
AK-Z Posted January 25, 2007 Share Posted January 25, 2007 BOV? or check the crank angle sensor? Quote Link to comment Share on other sites More sharing options...
datsun280zx81 Posted January 25, 2007 Author Share Posted January 25, 2007 I don't have a BOV yet. Everything is stock turbo set up switched to a 2+2. No intercooler or BOV yet. That was my next step as soon as income tax money came into play. What does the crank angle sensor do exactly and where is it? Thanks for the help. Quote Link to comment Share on other sites More sharing options...
datsun280zx81 Posted January 25, 2007 Author Share Posted January 25, 2007 Bump for more suggestionns... Quote Link to comment Share on other sites More sharing options...
Datsun_Mike Posted January 26, 2007 Share Posted January 26, 2007 check your stock wastegate... i think thats wat it was. The same exact thing happened to me. Quote Link to comment Share on other sites More sharing options...
mario_82_ZXT Posted January 26, 2007 Share Posted January 26, 2007 What is full boost? Is this an engine and ecu swap? Or just bolted on turbo parts? Need more info please. Mario Quote Link to comment Share on other sites More sharing options...
datsun280zx81 Posted January 27, 2007 Author Share Posted January 27, 2007 check your stock wastegate... i think thats wat it was. The same exact thing happened to me. What should I check on the waste gate? To see if it is working? Or the amount of boost? Quote Link to comment Share on other sites More sharing options...
datsun280zx81 Posted January 27, 2007 Author Share Posted January 27, 2007 What is full boost? Is this an engine and ecu swap? Or just bolted on turbo parts? Need more info please. Mario My boost is set to 7 pounds so when it reaches that amount that is full boost to me. Yes it is an engine and ecu swap. I put a 1983 turbo motor in a 1981 non turbo body and I swapped the ECU. Today I took it out to see if I could figure it out. I just put a new radiator in it, the second one this month. It got destroyed in the exact pattern as the first. It has a large cirlce shape in the center like the fins were sucked in. It has nothing to do with the fan hitting it. I think it might have something to do with my water pump because this is the second time it has happened this time it made my car overheat andsmoke from everywhere including the head gasket. LMK if anybody has any suggestions otherwise I am just going to switch to a V8 and make that turbo with the stuff I have now. Quote Link to comment Share on other sites More sharing options...
TONY C Posted January 27, 2007 Share Posted January 27, 2007 even with a stock swap you still have a bov.? well really it is a pop off valve. about 2" round 1.5" valve screwed in the top of the intake. it has a rubber diaphram in it and maybe it is bad. when you install a bov you need to remove this pop off and plug the hole. you can get a plug in the galvanize pipe plug section at the hardware store. since you are running stock boost you could go ahead and plug it now. a cheap bov from e-bay works fine , got mine for $1.25. just the spring is too stiff. just cut it. i have a cheap 1 and replaced it with a TIAL bov. the tial looks way nicer but seems to work the same and other than the sound I have experianced no other diffs. also rust build up around the waste gate actuator rod could be holding the wastegate open. PB BLASTER works great. or a bad diaphram in the actuator. as for the radiator, check the fan itself. maybe cracks at bottom of the blades [very common]. could be flexing way too much and the next thing that will happen is that it will leave town and take the rad, shroud, and hood with it. learned from experience. hope some of this helps. tc. Quote Link to comment Share on other sites More sharing options...
datsun280zx81 Posted January 29, 2007 Author Share Posted January 29, 2007 Is this the POV in the center of this picture? It is the clostest thing that matched your description. I am going to remove it, block it off, and replace it with a BOV tomorrow. Same with that EGR thing. I am going to attempt to fix a few problems by replacing the water pump with an electric one and getting an electric fan from motorsport auto. I need to get a new wastegate too. Any suggestions on which one? This is what it did to my radiator BTW. Not the best pic. Quote Link to comment Share on other sites More sharing options...
TONY C Posted January 29, 2007 Share Posted January 29, 2007 ouch! is the rad still holdin h2o? you could still run the oe water pump with no fan and use an electric fan. those electric pumps are espensive. as for the wastegate, your kindof stuck with the stock set up unless you get an external unit and that will require you to make a new down pipe and adapt to the exhaust manifold somehow. it will need exhaust flow from before the turbo. not cheap. lots of fab work. but if you end up doin it an hks or tial are the only brands to consider. tc. Quote Link to comment Share on other sites More sharing options...
datsun280zx81 Posted January 29, 2007 Author Share Posted January 29, 2007 The radiator still holds water but not for too long. Just long enough to test it. Money is not an object as long as it will fix the problem. I can do this because I have no kids and am not married I just wanted to fix everything that everybody said could be wrong that way I have all of my bases covered. It is either that or tomorrow if this guy answers my e-mail I will have a new second generation 300zx TT. Whichever comes first. Hopefully the 300zx that way I can get my 1000hp car. Quote Link to comment Share on other sites More sharing options...
george.bryant Posted January 29, 2007 Share Posted January 29, 2007 The thing in the middle of the picture that you refer to is the Idle Control Valve, I wouldnt get rid of that if i was you!!! The POV (pop off valve) was the the right of this but has been bunged on your motor already. I suggest you dont go messing around with things to much if you didn't even know that the thing you referred to was the idle control valve....:-s Quote Link to comment Share on other sites More sharing options...
datsun280zx81 Posted January 29, 2007 Author Share Posted January 29, 2007 I totally agree with you that's why I am trying to do my research to figure it out before just ripping stuff off. Quote Link to comment Share on other sites More sharing options...
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