Upgrades to my car - everyone please let me know your opinions

[slowbubblecar]

A safc, laptop and cheap cable would work perfectly fine for your setup. We didn't have a problem on my brothers car with that setup. When he went to 780's, we had erik burn a chip for the ecu to help for the injectors. He had a 2g mas also. 780s were too far negative on the safc to work very well. 650s or 550s should be no problem at all. You wouldn't need the palm if you have a laptop though. All you need is a cheap cable.

[Shane@DBPerformance]

The low pressure 255 has almost exactly the same flow properties at 40psi as a 255HP, so it will have the same possible overrun problems under idle/cruise.

You will want some sort of datalogger to get half of an idea of what is going on. The main problem with big injectors and an AFC is that when you have too go much negative on the AFC you can end up in a timing map that is too aggressive. On race gas it is less of a problem, because the gas can usually handle a bit more timing and you usually run a lot more boost on race gas, which helps push you farther away from the higher timing maps. Some people have to lower their base timing from 5 down to 0 on pump gas to keep the knock down. With a DSMLink, there is no fooling of the ECU going on.

Don't forget to rewire your fuel pump. I would probably try some cheap used 550s first. A few people on here have gone 12s on the stock 450s. My girlfriend went 120mph on her 550s.

[rk4g63]

The low pressure 255 has almost exactly the same flow properties at 40psi as a 255HP, so it will have the same possible overrun problems under idle/cruise.

You will want some sort of datalogger to get half of an idea of what is going on. The main problem with big injectors and an AFC is that when you have too go much negative on the AFC you can end up in a timing map that is too aggressive. On race gas it is less of a problem, because the gas can usually handle a bit more timing and you usually run a lot more boost on race gas, which helps push you farther away from the higher timing maps. Some people have to lower their base timing from 5 down to 0 on pump gas to keep the knock down. With a DSMLink, there is no fooling of the ECU going on.

Don't forget to rewire your fuel pump. I would probably try some cheap used 550s first. A few people on here have gone 12s on the stock 450s. My girlfriend went 120mph on her 550s.


So you think I can use 550's with the setup I've described (2g maf with dejon intake, safc2, datalogger, walbro 190 etc) and still achieve my goals? I'm just asking to see if I can get by with this stuff to meet the 3 goals I have:
High gas mileage
12 sec
good reliability

[Shane@DBPerformance]

Should be able to. Only in the last couple years has everyone thought they needed 880s to run 12s. You could achieve your goals with a 14B, 450s and a new O2 sensor, if you really wanted.

[rk4g63]

With the 450's - I'm scared of reaching fuel cut around 16-18 psi. Might damage the engine too. I want to be able to run 20 psi boost safely. Also, I dont know if my stock BOV will hold up to that pressure.