juiced_z28

iTrader: (12)

OK totally new to tuning. I have HP tuners and have a guy that has been helping me out that has tuned a ton of LT1 cars. Well I have a LS1 and he is kinda learning on these too. He said normaly a LT1 with 300rwhp would consume about 300 or so grams/sec. Well my car NA is 330 rwhp and seems to only consume about 236 grams/sec at the highest, noting again mine is a LS1. I changed MAF's to one with aftermarket ends on it that are 85mm and then logged it and it shows 252 grams/sec at the highest point. Well my car is a little lean on the dyno, around 14.0 and I have a dry nitrous kit on my car. Seems aweful lean to me. Car just has headers, ORY, cutout, airbox lid, and the above mentioned plus some suspension goodies.

So I guess my concerns are is the grams/sec reading normal for my car and hp level. Just trying to keep on top of things so when I spray I dont melt down. Keep me safe guys, Im buying diapers for two and bolt ons for another.

M_T_0

your MAF is un-calabrated because of the changes so you need to recal the MAF, do a search and you will find the procedure to do this.

good luck


More Than Zero

RedHardSupra

iTrader: (1)

like this: http://allmod.net/hpt

juiced_z28

iTrader: (12)

BTW forgot something. My dyno run was before the MAF swap. I swapped the MAF thinking it was the problem because it only was showing that the motor was consuming 236 Grams/second and thinking that a 300hp LT1 consumes over 300 grams/sec we assumed that a LS1 would consume more. Thats why I changed MAFs in the first place to try to get a better reading so my computer would add more fuel. I mean I heard most guys go a little rich with headers and stuff.

So my real question is what does a stock MAF normally read with only exhaust mods on a LS1 car. Grams/Second is what Im looking for on a normal LS1. If it is normally about 236 to 250 grams/sec then Im good to go and will start a little tuning to get things where I want em to be.

luv2spd

iTrader: (1)

Most LS1 guys use maf lb/min and a stock ls1 is prob gonna read between 27-29 which equates to ~204-219 grams/sec....that's just an estimate but I think that's about right.

juiced_z28

iTrader: (12)

Mine with minor mods including headers and ORY and cutout was 236 grams/second and with the 85mm throttle body housing with stock guts I logged with HP tuners and was showing 252 grams/second. Just sounds crazy to me that a LT1 with less power consumes more air than a LS1. You would think a motor with more power would use more air.

horist

I don't know much about the LT1s... but perhaps being an iron block more energy is lost because of heat than on an LS1? so it needs more O2 (air) in order to generate the same amount of useable power?

O2 (air) + Fuel will = power, but I think alot depends on how efficiently that 02 and fuel are added to the cylinders, and how much of that potentional energy is turned into useable energy (compared to heat which is another form of energy but can be detrimental to horsepower) ... there are other items to account for but it's been a while since I was in physics heh

Think about it this way too... stock LS1 is 78mm MAF right? LT1s were dual 68s or something like that? As engines become more efficient they can make more with less....

juiced_z28

iTrader: (12)

Good info guys, keep it coming, from other people Ive talked to this is sort of a hard topic to find some info on. Lets get some more of you tuners to chime in and let us know what kind of numbers you have seen on most of the cars you have tuned, stock and modded. Please list a few variations and some of the main mods. Thanks again all.

luv2spd

iTrader: (1)

Now after the mods in sig I pull about 39.5 lb/min or ~300 grams/second.

juiced_z28

iTrader: (12)

Ive got the same mods as you less the cam and valvetrain upgrades. Also no need for timing chain yet. Im going to install a G5X2 pretty soon.