I am posting for a buddy. He has just recently returned from over a year long deployment overseas. He has moved his car from west coast Washington area to Florida. Its been over a year since the tune/dyno run. Our question is, could the time since last being dirven and the change in location/atltitude/storage time effect the power? The reason I ask is because he drove the car and he said it dosn't feel like 400 whp anymore. He said it feels like 325-350ish. Is he going crazy or should he go get it retuned? His setup is a fully built B18C1 with a GT35R. I'm guessing it shouldn't take that long for it to spool up right? He barely got to drive the car with the GT35R before he left, so he may not be use to its characteristics of that turbo. I'm sort of in the middle on this one and without driving the car I cant give good advice.

Thanks for the help



Modified by Doostur at 12:07 AM 8/28/2007

 

I dont know if it would make that much of a difference, but altitude can affect it. Also gas is different for different states , so that could be a possibility

 

Uppie ^

 

possible he has some junk in his injectors and could use a cleaning. also him/her replace/regap the sparkplugs. also check the fuel pressure.

 

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The time lapse shouldn't change much if the engine was stored correctly and garaged correctly. If you didn't take the precautions for that long of a storage time you will need to change out a few items to get back to peak performance. But going form Washington to Florida is a decent enough change in altitude that to get max power from the set up you would need to re tune yes.

Air density changes with altitude and temperature. SO your AFR ratios are probably a tad off and therefor explain why it feels like it has less power because it does. Turbo cars can be pretty picky about this sorta of thing too so yeah getting it locally tuned should provide a nice boost in power for the car, if you have a wideband and the know-how you can probably do most the work on the street. The maps aren't going to be that off anyway and it should be a pretty global change to the map.

What is he using to tune if it's something like Hondata/Neptune(which hopefully it is) the parameters for Air temp should be taking care of the change in the temperature so the change in altitude is what is the main cause of the power loss. But I would check and change the Air temp fuel parameters for safe measure.

Again it should be relatively small and global tweak to get it back on track.