litch Posted November 20, 2011 Share Posted November 20, 2011 I wasn't quite sure where to put this, so do what you will with it. Anyway, I have an l28et with a p90a head. I blew a head gasket, and decided to do some minor port work while I had the head off. After putting it back together, it seems that the car does ok until 2000 rpm or so, and then it gets pretty gutless until about 4500. I read later that the ecu cannot compensate for head work and such. Could this be causing my problem? And help is appreciated. Quote Link to comment Share on other sites More sharing options...
Challenger Posted November 20, 2011 Share Posted November 20, 2011 (edited) What does minor port work entail? Edited November 20, 2011 by Challenger Quote Link to comment Share on other sites More sharing options...
litch Posted November 21, 2011 Author Share Posted November 21, 2011 (edited) Smoothing out the short turn radius, and polishing the casting and the injector transition into the runner. It just seems the car is gutless with bad throttle response. I know I screwed up somewhere, just not sure where. Edited November 21, 2011 by litch Quote Link to comment Share on other sites More sharing options...
FricFrac Posted November 21, 2011 Share Posted November 21, 2011 First off make sure all your sensors, ground and connectors are in good shape. The AFM is a common problem plug that can cause mayhem. With the stock ECU you won't see a lot of bennefit from porting other than the turbo spooling faster - doubt it would cause problems unless you wreaked something in the process.... most likely a sensor/electrical problem... Quote Link to comment Share on other sites More sharing options...
litch Posted November 21, 2011 Author Share Posted November 21, 2011 (edited) I went out and tried that. Its only under load that it feels gutless, by the way, as if it bogs really bad as it starts going into positive pressure. Edited November 22, 2011 by litch Quote Link to comment Share on other sites More sharing options...
S130Z Posted November 27, 2011 Share Posted November 27, 2011 Did you run a compression test to see if everything is correct after putting the motor back together? Are you sure there isnt a boost leak somewhere? Did you check fuel pressure? Go over the basics and make sure the small things are working correctly. Quote Link to comment Share on other sites More sharing options...
ZXR_KiD Posted November 29, 2011 Share Posted November 29, 2011 hate to state the obvious, but have you made certain the head did not warp with the gasket faliure? usually you would see other issues if your head was warped though. I agree with compression tests, if you attempted to do your porting with the valves in place maybe you hit one? I've done it before you can really goof somethin up like that. another possibility could be similar to an issue I had with the turbo car I had for a short while it would do similar falling on its face when I got it and discovered it was an issue with the waste gate actuator. Quote Link to comment Share on other sites More sharing options...
litch Posted December 3, 2011 Author Share Posted December 3, 2011 We have a seat/guide machine. All the seats were cut and valves ground. They all tested good under vacuum. I've checked around the headgasket and didn't see anything. Quote Link to comment Share on other sites More sharing options...
slownrusty Posted December 4, 2011 Share Posted December 4, 2011 I am not sure where you you read that the ECU cannot compensate for a "ported head"... because that is not true. I ran this heavily ported head head with stock ECU \ stock AFM, T3\T4 turbo and stock injectors and the car was a beast!! Port matched intake manifold: Yasin Quote Link to comment Share on other sites More sharing options...
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