Anyone else think their car felt / spooled faster after going speed density?
#1
Anyone else think their car felt / spooled faster after going speed density?
Did some more tuning last night and at 8psi the car feels really fast for such low boost. I noticed the timing (still controled by stock ecu) was only reading 12-14 degrees at WOT so I upped it to 20-23 degrees lol... you might say the difference was noticable. I haven't run a wastegate spring lower than 14 psi for almost 2 years now and haven't had the ability to tune those areas well because of how fast it transitions through them. Boost comes on faster now as well much to the dismay of my tires. I think in our current weather I could crack into the 10s at 8psi.
These kind of results are making me wish I would have gone to SD sooner. I've only got one fuel pump turned on at the moment as well so it's probably just about maxxed out. I need to wire in the hobbs switch for the 2nd pump so it kicks on under boost. I noticed my duty cycle was 55% at 6000 rpms with 96lb/hr injectors so fuel pressure is probably dropping.
These kind of results are making me wish I would have gone to SD sooner. I've only got one fuel pump turned on at the moment as well so it's probably just about maxxed out. I need to wire in the hobbs switch for the 2nd pump so it kicks on under boost. I noticed my duty cycle was 55% at 6000 rpms with 96lb/hr injectors so fuel pressure is probably dropping.
#3
Speed density is definately worth it.
Last edited by Zombie; 01-15-2008 at 04:05 PM.
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If you're talking switching to 2 or 3-bar SD, yep I definetly agree. 1-bar I had a big dead area at part throttle and low gear (1st and 2nd) under boost to compensate for the higher loads in higher gears. The 2-bar conversion allowed me to tune "under the curve" for part-boost conditions, and yes, that definetly reduced lag times and made the car "feel" much faster.
Might have to look at the timing on mine.....as I'm running a conservative puss 16 degrees at WOT. I'll be dyno-tuning the car sometime in the next 3-4 months....will post my $0.02 on timing then
Might have to look at the timing on mine.....as I'm running a conservative puss 16 degrees at WOT. I'll be dyno-tuning the car sometime in the next 3-4 months....will post my $0.02 on timing then
#10
Mine definitely spools up quicker with a 2 bar tune over a MAF tune. The problem with my MAF tune is that I had it tuned very rich when the MAF max'd out, so as the boost went up, it would go through a rich spot before the air would catch up with the fuel flow.
Now, I have it tuned to where the A/F is running around 14.5 at part throttle. You hit the gas, and it goes to 13. As the turbo spools, it goes to 12.5. At full boost, it's around 11.
Mike
Now, I have it tuned to where the A/F is running around 14.5 at part throttle. You hit the gas, and it goes to 13. As the turbo spools, it goes to 12.5. At full boost, it's around 11.
Mike