New Guy and 1990 GT build up
11-04-2014, 07:03 AM
#71
1st Gear Member
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Join Date: Apr 2014
Location: Florida
Posts: 91
mine is a custom cam from FTI for s/c application, it has some overlap but not as much as the xe274 my lift is .565/.555 and 214/218 @ .050 iirc, tomorrow evening I'll backprobe the hego sensors at the ecm to see if it is actually lean at idle....in theroy it should make my headers glow red that lean, but it hasn't even burned the paint off........I wouldn't of even discovered this issue had I not take the wideband off my carbed ride and put it back on this one........mainly due to the inj's are at 100 percent duty cycle at 5800 and they are 42's ........this thing made more power than I anticipated on the stock block, I really need to revamp the entire fuel system but IMO it's not worth it unless I have a better block, we shut it down on the dyno when it started to go lean at 5800 and power was still climbing at that point it was at 556 rwhp............I;ll let you know the results in a day or so when I get time to back probe the hego's it also tends to be a tad lean at very low speeds and very light cruise which low speed drivibility is a tad inconsistent.
I'll be interested to hear after you back probe them. I think I may do that as well since I have my computer accessible now. I'm thinking I should wire my LC-2 in on the EGR circuit to add that in the BE datalog. I haven't even used the innovate programs yet on the laptop.
Wow man your car sounds like a monster putting that kinda power down at the wheels.. Love it. So basically you'd want to swap in larger injectors but you're feeling like you are close to the line with the block?
11-04-2014, 08:14 AM
#72
D.R. THE PATHETIC DORK
Join Date: Jun 2007
Location: West Virginia
Posts: 30,863
Our lifts are basically the same, like you said my duration is just a bit more than yours. Be interesting if anyone else in here could chime in with their cam/WB readings.
I'll be interested to hear after you back probe them. I think I may do that as well since I have my computer accessible now. I'm thinking I should wire my LC-2 in on the EGR circuit to add that in the BE datalog. I haven't even used the innovate programs yet on the laptop.
Wow man your car sounds like a monster putting that kinda power down at the wheels.. Love it. So basically you'd want to swap in larger injectors but you're feeling like you are close to the line with the block?
I'll be interested to hear after you back probe them. I think I may do that as well since I have my computer accessible now. I'm thinking I should wire my LC-2 in on the EGR circuit to add that in the BE datalog. I haven't even used the innovate programs yet on the laptop.
Wow man your car sounds like a monster putting that kinda power down at the wheels.. Love it. So basically you'd want to swap in larger injectors but you're feeling like you are close to the line with the block?
11-04-2014, 08:56 AM
#73
1st Gear Member
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Join Date: Apr 2014
Location: Florida
Posts: 91
well, it'd be a little more than just inj's I really need larger fuel line from tank to up front, larger inj rail and a rear sum tank with larger fuel pumps.....long story short to do the fuel system the way it needs to be done to support 800+ hp I need to dump at least 1500-2k into it, because if I'm gonna do that, I'm not gonna continue to run a stock block, gonna go dart and if that's the case it'll be a 363 and then I'll turn the boost up from 12 psi to at least 18-20 and this is all in a convertible......so you see the mushroom cloud......So I'm just gonna stick where I'm at otherwise it gets real expensive really quick...lol
11-04-2014, 11:10 AM
#74
D.R. THE PATHETIC DORK
Join Date: Jun 2007
Location: West Virginia
Posts: 30,863
yeah that's what my tuner said to do, take the 12 lb pulley off and put a 10 lb one back on.......I say....NOT Go or blow......I just don't run past 5800 for any period of time which most of the damage would occur in long pulls in 3-4th gear so I have all the fun in 1-2 lol
11-04-2014, 01:32 PM
#75
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Join Date: Apr 2014
Location: Florida
Posts: 91
yeah that's what my tuner said to do, take the 12 lb pulley off and put a 10 lb one back on.......I say....NOT Go or blow......I just don't run past 5800 for any period of time which most of the damage would occur in long pulls in 3-4th gear so I have all the fun in 1-2 lol
11-05-2014, 08:27 AM
#77
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Join Date: Apr 2014
Location: Florida
Posts: 91
Mine is N/A.
Checkin my fuel pump wiring and relay circuit - 1990year, My #4 wire green/tan (high current circuit) has constant 12.65v with key off then drops to 12.4 with key on. Should be 0 with key off and should be Relay ground from PIN 22 at the ECM
Checkin my fuel pump wiring and relay circuit - 1990year, My #4 wire green/tan (high current circuit) has constant 12.65v with key off then drops to 12.4 with key on. Should be 0 with key off and should be Relay ground from PIN 22 at the ECM
Last edited by JBeachstang11; 11-05-2014 at 10:57 AM.
11-06-2014, 09:04 AM
#78
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Join Date: Apr 2014
Location: Florida
Posts: 91
Video of a short cruise. Not really smoking anymore. Will surge for a minute or so when I start it then seems to settle out. Still need to datalog with the innovate stuff and wire it in to the EGR.
Have a new walbro 190lph to swap in to see if that fixes the fuel press issue.
My tank was very low so I couldn't give it much juice in the vid, at one point I was giving it gas in 3rd and it sputtered, could be pump or low fuel level.
Swapping to Borla Pro XS, I'll post another vid for comparison after new pump and pressure readings.
Have a new walbro 190lph to swap in to see if that fixes the fuel press issue.
My tank was very low so I couldn't give it much juice in the vid, at one point I was giving it gas in 3rd and it sputtered, could be pump or low fuel level.
Swapping to Borla Pro XS, I'll post another vid for comparison after new pump and pressure readings.
11-06-2014, 05:02 PM
#79
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Join Date: Apr 2014
Location: Florida
Posts: 91
Swapped mufflers and tailpipes tonight, also replaced the fuel pump.
Haven't run the car - too late..
Did test fuel pressure just with key, motor off and instantly noticed a huge change. Pressure immediately pops to 40psi on the nose and then dips to 32 but holds strong and doesn't slowly bleed down right after priming like the old pump.
Also noticed the old pump rattled when I shook it after removing it. New Walbro did not do that. Maybe that's the check valve?
Hope to run it tomorrow and do a fuel press test with motor on, dumps codes again see if I still get 96.
Haven't run the car - too late..
Did test fuel pressure just with key, motor off and instantly noticed a huge change. Pressure immediately pops to 40psi on the nose and then dips to 32 but holds strong and doesn't slowly bleed down right after priming like the old pump.
Also noticed the old pump rattled when I shook it after removing it. New Walbro did not do that. Maybe that's the check valve?
Hope to run it tomorrow and do a fuel press test with motor on, dumps codes again see if I still get 96.
