I dynoed again today and stil can't get to that 400/500 benchmark that I want to achieve.

I instaleld the 6# pulley and elctric fan last weekend and was looking forward to dynoing again to get to the 400/500 barrier, unfortunately I fell short

I'm sending a chip in for reburn to get the AF leaned out a bit to get it around 12.5-13 all the way across the RPM range. I am running very fat from 4300 on at a 11:1 AF ratio.

I have heard differing opinions on what is safe. I have always heard 12.5:1 is a very safe tune and 13:1 is an aggressive race tune for a force induction car.

In another thread JJ's SVT said that the L is safe at 14:1....it just seems scary to me, just don't wanna blow it up running it lean like that....any opinions ?

Here's are my charts....hope I can get the 400/500 when I get back in town next month ina little cooler air and a new burn.

BTW-It was 95* on the dyno and my mods are Intake w/90mm MAF,exhaust,6 # pulley,single blade TB,electric fan and chip

 

The 95 degrees is killing ya.You will get the 4/5 club(or at least closer) in cooler weather.

VINNIE

 

I dont think any tuner would recommend to run 14. I have heard that 11-12 is good for power. Good luck in your quest.


G

 

Hi Red00,

The 95 degree temps were certainly hurting. You're losing timing for air temps above 77 degrees, in addition to the hotter air containing less oxygen, so you have a bit of a double-whammy hurting your power during that pull. Had you run at say, 80 degrees, you would have seen the higher numbers you're wanting, no doubt. Having a looser torque converter will lower your peak dyno readings as well.

14:1 A/F ratios are *not* OK for these motors, that's too lean for just about any gasoline engine. We generally don't like to see anything leaner than about 12.4:1 on these Lightnings, though there have indeed been chips out there running as lean as 13.9:1 that we've seen, sad to say. Yes, you can run leaner than 12.4:1 and make a bit more power on an inertia dyno, but that may not make you actually run quicker or faster at the track, especially on the big end.

I wouldn't run leaner than 12.4:1, and even at that only on the best quality pump premium you can get.

Overall, you're basically there power-wise with a little bit cooler temps.

 

Yea like what was tuned on my chip

 

What a/f ratio are they from factory?

 

Try five gallons of VP MR1, you'll get your #'s.

If numbers are all your concerned with, play with the correction factor, you can get just about any # you want

 

lol...I'm not looking for inflated numbers. I dyno and race in street trim. I don't ice the intake, run race gas etc.

I dynoed in 95* weather with my 20" rims, no ice on the intake, 93 octane pump gas. I want the numbers ,but when i get them they will be legit.

Same as when I went to the track. I raced on my 20" rims and full weight and raced straight up. I know I'm not going to get my best results that way, but I will have a much better gauge of what the truck is capable of. I have seen way too many cars that run 12.xx at the track but get killed on the street because they don't have their slicks,VHT to hook up, or their ice on the intake before we roll up to a light.

I like to know what the truck will do on a daily basis...each and every time I decide to run someone. If it's 14's in street trim ,then so be it.

--wes

 

14:1 A/F ok for a blower engine?

Buwhahahahaha, I know of one tuner who will never get business from me. That's a grea A/F ratio, if you are trying to blow it up!

joe

 

Have you had the intercooler replacement recall thing done yet? Maybe youre hurting there.

 

Sounds like something is wrong with your truck.

I dyno'd my JDM street chip at 407/455 with just a 2lb pulley.

Coldie

 

don't send in your chip,

you already have the power to make the numbers, it's just too hot,

the correction factor is already there, yes, it corrects for temp.

However, the L's add 3 degrees of timing from 80 down to 50 degrees.

My chip is programmed for cold weather at 14 degrees, warm at 17 and race at 30.

Now, at 50 degrees, each of these programs is going to make 3 degrees more timing.

Each program seems to be good for about .12 from 1 flip to the next for a total of .24 in the 1/4, definate HP gain.

My race program has an 11.44 a/f, and my street programs have an 11.55 a/f up top.

You will make more power with leaner a/f but you are risking your engine, on a s/c vehicle especially on pump gas i would not push it past mid 11's if you want any kind of longevity, i don't care what other people are saying.

You need to find out what timing your running up top.

It's funny, you'll get a lot of input from people that know nothing of what their a/f or timing is in their chips.

I have 26k miles in 11 months with a 4lb pulley up to 10k and a 6 from 10 to 26k, i have about 200 1/4 passes in the same 11 months and still holding strong.

I know of very few people who drive/abuse their truck as much as me.

Just wait and schedule your dyno day for mid october or nov.

In mid 70 degree weather i made 400 and 500.4 on my race program,

btw, i don't run anything less that 98oct on my race for added safety,

i imagine i'll see 10 more or so on each end when i do a 50 degree dyno run

 

Sounds just like me!!! LOL

 

Actually I misunderstood what he was saying, he was mentioning that's what the computer is trying to get to, perfect stoich.

I don't want to make people think he said that, it was definitely taken out of context.

--wes