After spending nearly 2 hours fine tuning the maps, rpm fuels and ignition retard/advance parameters, I decided to go out on the highway to see if this puppy is ready for Feb. 22nd. Using this time to fine tune the gain and ratio on my blitz dual SBC boost controller, I began flooring it in 4th gear.
1st order of business was to see if the tuning in the ignition department cleaned up some very small abnormalities in performance; and at 15psi the car moved like a dream come true.
2nd order of business was to reset all 4 of the dual SBC's boost channels. Channel 1 was set to 15psi, channel 2 was set to 18psi, channel 3 was set to 20psi and channel 4 was set to 25psi.
Now to test them to see if the fuel/ignition maps were on time as well as finding the end of the road for the MSD 50 lb/hr injectors. Channel 2 is 18psi, so I floored it to make sure it stay settled at 18 and not another psi more held it for about 7 seconds while also checking the injector duty cycle. At full throttle, these puppies were at 80% duty cycle (not too bad). I went to channel 3 which is 20psi and repeated the process. This time I seen 85% duty cycle, but the car is now trying to damn near lift off the ground (sounded so sweet;) ). I tried channel 4 for a second which is 25psi and it was feeling like a true 5.0 litre, but then the vacuum hose to the wastegate controller blew-off and show time was over.
Tuning, tuning and knowing your engine is the name of the game. I have my sights set on a really low 12 to 11 second run, so I have to push this engine a little more than it's used to, but I'm under the strangest feeling that it's loving the extra boost and stress.
Dee
Pushing the stock CA18DET w/50lb/hr. injectors!
-
boost_boy
- Posts: 7051
- Joined: Thu Nov 14, 2002 7:28 am
- Car: B12 sentra w/built CA18DET, B12 sentra w/fully-built CA18DET, S13 coupe w/ CA18DET, S13 hatch w/CA18DET, 2002 maxima SE
- Location: Miami, FL.
- Contact:
Please post this as a sticky!
Final report: This should be a sticky for CA18DET owners who's into tuning and attempting to extract horsepower with minimal mods. The CA18DET at 18psi on MSD 50lb/hr injectors and full throttle will yield 107% duty cycle for the injectors. This means that your 370cc injectors are worthless past 10psi of boost and you are flirting with disaster. So at 15psi and a T3 or better sized turbo, the max power you will get out of these injectors is an estimated 325whp on our 1809cc motor and that is while tuning on the edge for max power. I'm safely doing very close to that # since I haven't been back to the dyno after putting down 306.6whp@15psi with a few minor issues that are now corrected. My fuel ratio was sweet (mid to low 12s), but the guy on the dyno said that's about it for those injectors and I concluded today, that they are done at 15 maybe 16psi.
Dee
Dee
Quote »This means that your 370cc injectors are worthless past 10psi of boost and you are flirting with disaster.[/quote]
you should make it clear this is with a T3
on the stock T25 i was at about 75% duty cycle at 14psi
this is with a steady A/F ratios of 11.7
so the stock 370cc injectors CAN handle preasures above 10psi
you should make it clear this is with a T3
on the stock T25 i was at about 75% duty cycle at 14psi
this is with a steady A/F ratios of 11.7
so the stock 370cc injectors CAN handle preasures above 10psi
-
boost_boy
- Posts: 7051
- Joined: Thu Nov 14, 2002 7:28 am
- Car: B12 sentra w/built CA18DET, B12 sentra w/fully-built CA18DET, S13 coupe w/ CA18DET, S13 hatch w/CA18DET, 2002 maxima SE
- Location: Miami, FL.
- Contact:
By all means, your input helps. And actually in my post, it clearly stated with a T3 or better sized turbo. I can't speak for the T25s because I don't use it, but that's where guys like you come in. Every bit of information helps and I think our members need to know where their cars stand with X-mods. For you and I we have standalones, so we can see where things are; others cannot. So guys now you know and that's just half the battle.
Dee
Dee
4g63, sr20, ca18 all work out to about the same. One recipee would yield similiar results on either. Match your turbo / expected hp to your injectors.se-r guys had problems with the msd 550s (locking up or somethin) 4bar jwt package, so they pulled it and recommended the 3bar 720cc instead. Dunno if this may affect u.Some questions;did u have to modify stock ca18 fuel rail to accept msd 550s ?stock ca18det fuel pressure regulator ?are u using a wideband ?type of fuel ?maximum timing under boost ?
seen a sr20det powered b12 on the se-r forumsyour lil lightwt must be a rocket with a ca18 at 25psi
seen a sr20det powered b12 on the se-r forumsyour lil lightwt must be a rocket with a ca18 at 25psi
-
boost_boy
- Posts: 7051
- Joined: Thu Nov 14, 2002 7:28 am
- Car: B12 sentra w/built CA18DET, B12 sentra w/fully-built CA18DET, S13 coupe w/ CA18DET, S13 hatch w/CA18DET, 2002 maxima SE
- Location: Miami, FL.
- Contact:
Quote »did u have to modify stock ca18 fuel rail to accept msd 550s ?[/quote] No. They were a direct fit.
Quote »stock ca18det fuel pressure regulator ?[/quote] No. NISMO F/P regulator.
Quote »are u using a wideband ?[/quote] No. It's dyno tuned and the fuel injector duty, Air temperature sensored and engine temperature sensor is monitored through the SDS system.
Quote »type of fuel ?[/quote] Pump 93
Quote »maximum timing under boost ?[/quote] Up to 18psi, it is 26degrees BTDC because of the type of fuel used. The CA18DET does not like too much timing like your average engine.
Dee
Quote »stock ca18det fuel pressure regulator ?[/quote] No. NISMO F/P regulator.
Quote »are u using a wideband ?[/quote] No. It's dyno tuned and the fuel injector duty, Air temperature sensored and engine temperature sensor is monitored through the SDS system.
Quote »type of fuel ?[/quote] Pump 93
Quote »maximum timing under boost ?[/quote] Up to 18psi, it is 26degrees BTDC because of the type of fuel used. The CA18DET does not like too much timing like your average engine.
Dee