a 2wd Lq9 w/ long tubes, CAI, tune puts down about 305rwhp/335rwtq

what gives?
that translates to about 365 crank hp and 400crank tq
the engine is stock with 345hp and 380(?)tq.

Does a tune, CAI, long tubes and catback really only amount to 20hp? because if so, I'm done modding for a while.

https://www.performancetrucks.net/fo...4&postcount=45
here is one without headers putting down similar numbers

https://www.performancetrucks.net/fo...1&postcount=46


what gives

 

why get caught up in dyno numbers?? read more

 

Every truck is differant man.Not to mention the differance that every truck puts down differant numbers stock vs stock.They are almost never the same.
What you get is a varying number each time you build a motor.Simple as that.

 

OEM engines dont range that much. If we were talking home built shortblocks and home ported heads- yeah.

People are claiming 30rwhp with tunes and 25rwhp with headers and 15rwhp with intake/catback....

yet they are gaining 15-20rwhp from all of them. Maybe I've just been optimistic or something. I thought I read a thread somwhere that the Lq4 gained 50+ hp on the dyno with tuning and another thread showing 25rwhp gains with pace setters. OEM engines dont vary by 50+rwhp. they vary by 5-10 at most.

Maybe I'm way off base.

 

Dyno's can be off too. I have seen a dyno read 270RWHP with over 700FTlbs on a V6 Ranger. It could just be the dyno is reading low.

 

Usually it's about a 20hp vary.I've seen many vary 20 hp alot of times.
Also they all respond differantly.
You would think they would all respond very simliar but it doesn't always work out like that.
You also cannot combine hp from each thing they have to work together.I'm sure you know that.
Basically just because you see a couple put out whatever numbers it does not mean you will ahve the same thing happen to you.
Differant dyno's also have a factor in what the end result is as well.
It's really just alot of things to why the numbers fell the way they did.
I say keep modding.

 

BTW i only picked up 6hp from a dyno tune.Just depends on the truck man.
Went back and retuned and got 5 more squeezed out of it.This is also from a shop that has had trucks pull 30 plus from a tune.....

 

I'm pretty set on magnacharger w/ injection +headers + 6L85E when support is up to do it. Nice, reliable, fuel efficient, tame, clean setup.

I'll prob start it in the spring. Once I can turn a reliable 13 sec time, i'll be content for a daily driver.

 

You must look at the full picture. Example #1 is not tuned on the dyno, and if you notice is running way rich. If the a/f ratio was leaned out to 13:1, it could improve the numbers. Also, he's not running cats and nothing is mentioned about the rest of the exhaust back. He could be losing out on some power based on that.

Example#2 has been dyno tuned - it should be optimized because of this and this should be the best numbers based on the setup for that truck. If he had longtubes, I'm sure those numbers would be higher.

Of course, every package is different, lots of variables are involved, including the variances that have already been mentioned here. The only way really to compare two different trucks, such as you are doing, is if they were both on the same dyno on the same day.

 

Another thing to consider is the gear it is dyno'd in. I did mine in 2nd because with the 3.42s I had at the time, it hit 150mph on the dyno and they decided to shut it down because of the stock tires. I think if I did it with 3.90s and the cut-outs open in 3rd gear, I could hit 300rwhp. I've got full bolt-ons, cam and dyno-tuning and there is some people on here making the same to a few more with just bolt-ons. I think it's because of the gear, in my situation.