Hey guys, this forum is great. I've recently been on mitsubishi-forums.... lets just say theyre terrible and i shouldve never started there in the first place. Well over the past year I've been building my RS a/t. Here is my mod list:
52 trim ebay turbo 12:1 fmu fmic 255 walbro 2.5 inch straight exhaust missing link oil/boost pressure gauges and thats basically the important stuff
Now on to my problem. ever since i first drove thsi, i had a problem where i would give it maybe more than 20% throttle and the car would stutter and buck if i gave it more gas. if i let off the gas while doing this, i would end up accelerating. Ive been dealing with this for about 6 months now. I have no clue on what to do. Any suggestion would be nice. It could be fuel cut? possibly a boost leak, yet i check everywhere. and i might be... well only god knows really. or you guys. Its embarassing pulling up to a light next to a civic with a coffee can on the back, and i cant do anything about it... Could it be that im pig rich???? let me know guys, thanks
#108562, "RE: My boosted Rs doesnt accelerate!" In response to Reply # 0
First impression to me is way too much fuel. If its bucking under throttle and when you let up it wants to accelerate, that to me means when you let off the gas the air:fuel is actually going towards something it can use instead of just raw fuel. Have someone drive behind you when you go WOT and see if its backfiring/blowing black smoke out.
Also, did this problem just arise or has it been like this since it was turbocharged?
95 Eclipse GS: 10.5:1, Crower 2's and MSII 186 WHP - 150 WTQ 14.697 @ 93.85 MPH......Gone, but not forgotten 99 420A Avenger: Given to my sister 99 GS OZ: Sold 03 Evo 8: Family Car with balls
#108563, "RE: My boosted Rs doesnt accelerate!" In response to Reply # 1
Originally posted by 740 turbo brick First impression to me is way too much fuel. If its bucking under throttle and when you let up it wants to accelerate, that to me means when you let off the gas the air:fuel is actually going towards something it can use instead of just raw fuel. Have someone drive behind you when you go WOT and see if its backfiring/blowing black smoke out. Also, did this problem just arise or has it been like this since it was turbocharged?
This has happened since the first drive of my build. would it be wise to drop in the stock fuel pump and disconnect the fmu and give it a try?
#108564, "RE: My boosted Rs doesnt accelerate!" In response to Reply # 2
Originally posted by bigray1111
Originally posted by 740 turbo brick First impression to me is way too much fuel. If its bucking under throttle and when you let up it wants to accelerate, that to me means when you let off the gas the air:fuel is actually going towards something it can use instead of just raw fuel. Have someone drive behind you when you go WOT and see if its backfiring/blowing black smoke out. Also, did this problem just arise or has it been like this since it was turbocharged?
This has happened since the first drive of my build. would it be wise to drop in the stock fuel pump and disconnect the fmu and give it a try?
No.
What injector sizes do you have? Fuel pressures? Wideband readings? If you have no way to tune that should be your next purchase.
Without anything to tune or give you feedback you are shooting in the dark.
#108565, "RE: My boosted Rs doesnt accelerate!" In response to Reply # 3
I have the stock injectors, no way to monitor a/f and no way to tune... im only in highschool and ive put every dollar i have into this car haha. pretty bad on cash...
#108566, "RE: My boosted Rs doesnt accelerate!" In response to Reply # 4
I understand. Just keep in mind that turbocharging the stock 420a in your situation (without proper monitoring/feedback) will likely end up in some form of internal damage from poor fuel or detonation control.
Investing a small amount now may prolong a costly rebuild in the future. Hypothetically, what would happen if you blew a piston ringland and needed a rebuild? All the money you have dumped into it is useless.
#108567, "RE: My boosted Rs doesnt accelerate!" In response to Reply # 5
youre very right. i would just like a little more "insurance" and knowing that it would work before i go ahead and spend more money. know what im saying??
