Ozzie831 Posted July 7, 2014 Share Posted July 7, 2014 I have a 77 280z that I just turbo-ed and for some reason it feels slower than when I had headers on it. It seems to be faster when the car is not in boost (currently set to 10psi) and that it seems to slow down with boost. Car details: 77 280z (California model) Turbonetics T3/T4 .63ar 50 trim Aluminum fuel rail 3" intercooler piping 55lb injectors MSD 6AL 280zx turbo dizzy 280zx alternator swap Fusible link upgrade to maxifuses 3" exhaust 240sx TB Electric fans MSD blaster 2 coil I know I left it as a pretty vague but I just have no idea where to start or even what i need to check. I'll be happy to answer any questions to the best of my ability. Thanks for the help, Austin Quote Link to comment Share on other sites More sharing options...
BLOZ UP Posted July 7, 2014 Share Posted July 7, 2014 What ECU are you using? I'm assuming standalone since you have large injectors. How's the tune? Ramping up fuel too much too quick when building boost will make it feel like a pig. Should still be relatively fast to NA, though. Quote Link to comment Share on other sites More sharing options...
Ozzie831 Posted July 7, 2014 Author Share Posted July 7, 2014 Using MS1, forgot to put that. The tune is slightly rich, 13ish afr, but i dont think thatll make it run mega slow Quote Link to comment Share on other sites More sharing options...
infiltrate2000 Posted July 7, 2014 Share Posted July 7, 2014 I would check for boost leaks. Check condition of turbo impeller. When the turbo starts spooling, is there any hiccup or bogging? Does it build 10 psi? Does it seem laggy? What wastegate are you running? Quote Link to comment Share on other sites More sharing options...
SDgoods Posted July 7, 2014 Share Posted July 7, 2014 (edited) Using MS1, forgot to put that. The tune is slightly rich, 13ish afr, but i dont think thatll make it run mega slow if you're referring to 13's under WOT, that's too lean. Keep it safe around 12. If it's not pinging at 13's but its still sluggish, it's probably not fuel related. Edited July 7, 2014 by SDgoods Quote Link to comment Share on other sites More sharing options...
Ozzie831 Posted July 8, 2014 Author Share Posted July 8, 2014 Infiltrate2000: it builds 10 if im going uphill, ive never owned a turbo car before so idk what laggy feels like, Im running a tial wastegate. Quote Link to comment Share on other sites More sharing options...
Tony D Posted July 8, 2014 Share Posted July 8, 2014 (edited) If you're talking about it building boost up hills....I'm going to throw out your lugging the engine and expecting power from 1,000 up, and not like a normal Z at 3,000 up. Boost on the turbo with an A/R of .63 won't happen WOT in any gear before 2,500-3,000 rpms and if you are 13:1 AFR out of boost you are losing off-boost performance as well. You really need to post a data log of a pull so we can see your MAP/RPM/Timing along with AFR... Timing should be normal at zero MAP or in vacuum and NOT start retarding until you are actually making boost of 2-3psi. The 13's over 4,500 is not an issue, you have to pull fuel quite a bit to make horsepower past peak torque. 12.8 or so below there with a bit more fuel around torque peak... Can you put the car into 3rd gear at 45 mph, go WOT and make a data logged pull to near redline? Edited July 8, 2014 by Tony D Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted July 16, 2014 Share Posted July 16, 2014 Retared timing will also make it sluggish. My timing is 30 degrees at idle and bumps up incremently to 40. At 4psi it starts retarding down to about 25 at 15 psi. Quote Link to comment Share on other sites More sharing options...
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