my 89 gt is running reallly lean...my set-ups in my sig...should i bump fuel pressure up? cars getting tuned but not till the 21st of june ( they are booked)...thanks
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308 performer rpm heads, b-cam, cai, msd6a, cobra intake 65mm tb,mac 1 5/8 shortys, custom 2 1/2 inch h pipe with 40 sereis flows, 373's, cobra maf and injectors, 190 pump and mallory regulator. painted pearl white
yea thats a temp fix, it just makes it rich at lower rpms, but will keep you from leaning out in upper rpms
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For Sale: Edelbrock RPM 2 intake Edelbrock RPM heads comp XE270HR-14 comp magnum double roller comp cams magnum 1.6 rockers ford racing lifters hardened Pushrods aode,modified valvebody, 2500-2800 stall, and 28oz flexplate -pm for more info
do you have a FPR (fuel pessure regulator)? Whats your idle Fuel pres. now?
Mine runs at 41psi @ idle 45psi @ 5800rpm on dyno-- in which i do have a n20 kit and 30lb injectors and dif heads, so therefore my engine needs more fuel.
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Speed cost Money.... How Fast do you wanna go????
(n20, 3.73's, World heads, Custom cam, Ported u/l'r Power Products intake, BBK stuff, ARP parts, QA1 susp., Moser axles, MSD diggy 6, E-fan, EFI, Built PA C4)... there's more--- trust me
hes got a mallory regulator in his sig. start with 39 w/ vac off, then work your way up.
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For Sale: Edelbrock RPM 2 intake Edelbrock RPM heads comp XE270HR-14 comp magnum double roller comp cams magnum 1.6 rockers ford racing lifters hardened Pushrods aode,modified valvebody, 2500-2800 stall, and 28oz flexplate -pm for more info
didn't see that part... Whoops. Do like Stinkin' said. you'll be fine. Buts it's a temp fix. A dyno tune will tell you how much the injectors are working at what % @ what rpm, and will also be able to squeeze out some more ponies i'm sure.
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Speed cost Money.... How Fast do you wanna go????
(n20, 3.73's, World heads, Custom cam, Ported u/l'r Power Products intake, BBK stuff, ARP parts, QA1 susp., Moser axles, MSD diggy 6, E-fan, EFI, Built PA C4)... there's more--- trust me
ok i got the fp up at like 44....pulled out number 1 plug out when installing my new rocker arms ( to find tdc) and my dad showed me i was lean....so i pulled number 5 out today and it was the same as number 1 so i bumped the fp up to 44 when vacum off..
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308 performer rpm heads, b-cam, cai, msd6a, cobra intake 65mm tb,mac 1 5/8 shortys, custom 2 1/2 inch h pipe with 40 sereis flows, 373's, cobra maf and injectors, 190 pump and mallory regulator. painted pearl white
remember..it's not as easy to read plugs on an efi car when it's running okay vs a carbed car......efi cars generally will show a whiter plug than a carbed car.....correct way to tell on a efi car is have a wideband set up to monitor a/f through whole rpm range and under all conditions
yea..well tuning shop is booked and im scheduled june 21..theres another mustang place img onna call tomorrow and see if they can do anything( i didnt go to them because i heard a lot of badd stuff) but i'll see what hapends
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308 performer rpm heads, b-cam, cai, msd6a, cobra intake 65mm tb,mac 1 5/8 shortys, custom 2 1/2 inch h pipe with 40 sereis flows, 373's, cobra maf and injectors, 190 pump and mallory regulator. painted pearl white
+1--- like i said 89mustangfive0--- My car has some decent mods (read sig) plus some fuel upgrades and i'm at 41psi @ idle... and after checking my plugs every 3-4months i still get that grey'ish tint to them, but my tune says it's all good.... Just wait for the tune... When your car is warming up. Do you smell the exhaust easily?- Kinda like gas fumes--- you know like a rich burning car? if so, it's not lean.... just need a tune.
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Speed cost Money.... How Fast do you wanna go????
(n20, 3.73's, World heads, Custom cam, Ported u/l'r Power Products intake, BBK stuff, ARP parts, QA1 susp., Moser axles, MSD diggy 6, E-fan, EFI, Built PA C4)... there's more--- trust me
its rich at idle put it through the rpms--- who knows until you tune it. Fuel Pressure should go up w/ rpms.---- Lean will actually pop head/piston pretty much blow up... you can never go wrong with being rich--- There is such thing as being too rich... Wait for the tune you'll notice a diffrence.
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Speed cost Money.... How Fast do you wanna go????
(n20, 3.73's, World heads, Custom cam, Ported u/l'r Power Products intake, BBK stuff, ARP parts, QA1 susp., Moser axles, MSD diggy 6, E-fan, EFI, Built PA C4)... there's more--- trust me
i drove mine for about 1yr w/out a tune.... although i have the Zex n20 kit-- so therefore really no need to... and the guys that built knew what they were doing. Once i got stationed here, thats when i forked out the $$$ and got it dyno tuned. tune time + 3 pulls (on pump gas) was $475... Car runs betters, still has a rough idle (due to the cam), lill better gas mileage (although i dont care its a weekend car), and it ever revs a lill faster. Race gas tune was $300- pretty much the same as above (exceot the mileage part) but it pulls harder on race w/ n20-
514ftlbs race gace- n20 491ftlbs pump- n20
492rwhp n20 race gas 474rwhp n20 pump gas n20
321rwhp N/A- pump gas 331ftlbs N/A - pump gas
You'll prolly notice some of the same changes.
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Speed cost Money.... How Fast do you wanna go????
(n20, 3.73's, World heads, Custom cam, Ported u/l'r Power Products intake, BBK stuff, ARP parts, QA1 susp., Moser axles, MSD diggy 6, E-fan, EFI, Built PA C4)... there's more--- trust me
Posts: 146
Joined: 5/21/2008 From: NORTH CAROLINA Status: offline
yea deffinelty better to be rich then lean, they have all told you correct, id just leave your fuile pressure between 41-44 till your tune and just be easy with it, you might have a injector issue or clogged fuel rail, (happend to me) also whats the cobra injectors? are they 24lb if i rember? or 30lb. make sure the mass air is correctly calibrated, good luck
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running lean like mothaa - 
