I have a 99 lightning with the following mods what do you think it should run in the 1/4 mile my best was a 13.89 and had another guy drive it and ran 13.98

my time other guys time
60foot-2.072 2.058
330- 5.707 5.703
1/8- 8.796 8.839
1/4- 13.841 13.968
mph 95.553 95.575

k&n air filter
90mm mass
true flow elbow
accufab single blade throttle body
ported plenum
stigiemiers poted eaton
2.80 upper pully
4lb lower pulley
LFP heat exchanger
grantille coils
ngk tr6 plugs gaped at .38
160 thermestat
boost bypass
4:10 gear
sct tunner TUNED BY LFP
nitto drag radials

 

AT LEAST 1 second faster (actually alot more than even that)
Filter Chip n 4lb Pulley is INSTANT 12 sec L "without any of the other mods"
and that would be on a mild program. You have 2 problems, one is you dont have the MPH which means your tune is either way off or something else is DEF wrong, and two you have at least a 1/2 sec more to claim by improving your 60ft. BUT your MPH is your main problem it tells the whole story, the power simply isnt there that you should have for those mods. Your MPH should be AT LEAST 12-15 MPH more for 3.73's and a 4lb pulley. Of course the 4.10's do change that a little but your not running fast enough yet for them to be a problem, but they will be in time 4.10's are too much gear for a fast Lightning and maybe part of your problem, but def not all of it....

To give you an idea back in 02 on a 100% stock L with Stock Tires no traction bars no nothing other than a 4lb pulley open filter and mail order single chip for pump gas, I was running 12.8 @106.7 MPH with 1.90 60ft on F-1's. You should be running mid 12's or better and have a higher MPH than that. Not to be taking wrong but for comparison a 100% stock L will usually run better ET and MPH than that, so you DEF have something wrong.
How does the Truck Run ???

 

I would have to agree...Im running less mods than you and Im running 12.59 @108 on crappy prepped track. Sounds like you may need a retune? Get it to the dyno and retune. 4:10 arent your problem. You dont have enough hp rating at this point. Your not pushing the 120mhp plus mark yet. Somethings definitely off...A stock truck runs that all day long. Take it back to your(or another tuner) tuner and do some datalogging....

2003 Lightning | Ported Eaton, SCT Xcal2, 6lb, E-Fan, Lfp-exchanger, Lfp Idlers, JLP CAI, TR-6, 2/6 drop,
Bassani BX catback, SCT 2400 Maf, T-Bars,Chromies,Hoosier stickys',4:10's, LC-1 Wideband, Boost gauge
(built block and whipple coming soon)

 

Something wrong.. My times and mods are below.. Remember heat kills, your climate and altitude have an impact also ...

PEacE...................
Jim

 

i agree with the above posts....your tuneup must really really off or there is somthing mechanically wrong...i have a friend with a bone stock lightning that goes 13.50's consistantly.

 

With traction I'd say you should be running 12.60-12.80's no problem, so I agree with the above something is not right, I start buy Dynoing to see where your at, my be pig rich, your right on the edge of needing a new maf meter as well, SCT 2400 or an extender, how about fuel filter?

 

the truck seems to running fine but the power don't seem to be there i have been told that LFP dosn't tune very well but i don't no if thats true

 

You have a SCT Tuner so your in good shape
Mark @ LFP has always been a great Vendor to get parts from but I have never heard anything about his tuning (at all) over the years, amof I dont think I know anyone who has his tune now that I think about it.
It's your decision who you choice to tune it but either way I would start there and send that SCT out for re-tune. The good news is most of the big Tuners use SCT so you have many choices if you decide to try someone else.

 

hands down the best tuner i have ever worked with... www.alternativeauto.com

 

I ran 12.44 @108 W/ 4lb lower a good tune and a set of slicks!!

 

I can run 13.1 blowing the Goodyear F1's off in 1st gear and some of 2nd. Either your tune is WAAAAY off or you have a mechanical issue with the tranny.

just my $.02