is this true? how do you figure changing computers is worth more HP? can't you tune them equally?

 

I think

5 tenth & 3 MPH from LT's

2 tenth & 2 MPH from other mod's & tuning

BTW...Get your Y-pipe & DR's you'll see 12's...

congrats for new best dude....

 

Well maybe it's because your post is titled

"Results from Jet-Hot LTs"

Not "Results from Jet-Hot LTs and some other mods"

I'm sorry, I'm an engineer and I'm **** about this kind of stuff. There have been too many times when I have tried to trouble shoot problems, and when too many variables are involved, like you have, you can't make any solid claims. That's all.

Congrats on your gains.

I just don't want people a few months from now saying "There was this guy gained 5 mph and 7 tenths from long tubes. I saw it a few months ago." Then people start to think that those gains are expected.

If you go by the rule of thumb that .1 seconds in the 1/4 mile = 10 HP, then you gained roughly 70 hp. Being conservative, let's say 50 HP. How much of that do you think is from LT's? Obviously the other mods had a significant impact on the performance. That's all.

I am happy to hear about your performance increase. I really am. I just want the claims to be as accurate as possible so others aren't misled in the future.

Dan

 

Sounds awesome, Your gainin a little extra running open headers, and hes sorta right with the extra mods. A good tune on a stock car can pick up to 10hp no problem, and a car with a full exhaust and opened up intake can gain probably up to 20hp just in a tune, plugs and wires that you replaced might have picked you up a few.

If you could gain .7 from headers that would be sweet, and Im kinda jealous considering i ran 13.2 with a cam and other boltons, but at 110mph so i was lacking traction. you definitely have a 12s bolton car on your hands, get hooked and youll be high 12s no problem. congrats.

 

look Captain Obvious...... its cleary stated that had a few other changes than just the LT headers

 

Thanks bud, but there are plenty of people out there that will say "this guy gained 40hp from just an exhaust, not knowing that they had an extremely choked up 396 with very high flowing heads and they expect to get the same gain from their bone stock engine. Just clarifying the fact that it was not only the headers that gave the gain since its not clarified in the original exactly what was done except "other goodies". Not being an ******* or anything, just clarifying for the "extremely optimistic people" out there

 

Well, you may have room to try and argue his gains, but how do you explain mine? The ONLY thing I changed was the headers and y-pipe (only because I had to), and I picked up 6 tenths and 4 mph with NO tune. The weather was nearly identical and the runs were made just a few weeks apart at the same track. Now my results may not be the norm, but they sure aren't the best I've ever seen or heard of.

I thought it was 1 mph = 10 HP. I maybe, and probably am wrong about this....but that's what I had always heard. I still don't think that is an EXTREMELY accurate way to measure horsepower gains.

 

O.k. Captain Sarcastic. Did I start by calling you names?

Did you read the title?

It's misleading. That's all. Ok. We're beating a dead horse here.

I've said over and over that I'm happy to hear about his gains.

There are a lot of newbies on this site that may take the post the wrong way, assuming that the LT's got such huge gains.

LT's are great, don't get me wrong, I was just hoping the facts would be stated a little more clearly.

Dan

 

Did you change your cat back as well? Did you already have a less restrictive exhaust? Did you have to make any adjustments with the PCM?

Those are great gains. Did you dyno it?


You could be right about the 1 MPH = 10HP. I gave him only 50 HP for 0.7 tenths, so I was being conservative. If you go by your analogy, I was correct. I gave him 50 HP for 5 MPH.

I'm all done talking about this. I don't want to keep bickering about this. I don't want to make enemies here.

I'm probably being over analytical.

Dan

 

Forgive me, as I was not trying to argue...merely express my experience with the longtubes. I believe it is good for people to challenge claims made by people to a certain extent to keep newbs from getting on here and claiming to get 25 rwhp from a cold air intake, or to claim that there bone stock LT1 Z28 ran 12.5. When I first started learning about my car, I believed that everybody knew more than I did and I took what people, who had no idea what they were talking about, were saying as fact. By others challenging what they claimed, I realized that you can't believe everything you hear...especially when it comes to what modifications really do what. If any of that makes any sense.

As for as the rest of my exhaust...it was all stock before the headers except for a cutout (stock muffler and intermediate pipe), and it has not changed. I didn't have to do anything to my PCM either. I could probably pick up pretty good from a tune as I have stared at an SES light for over a year, but I'm about to do some motor work and have been waiting to get the tune until after I'm done. However, I WISH I was in a position to have been able to dyno my car, because I believe I picked up around 30 rwhp, if not more, by just adding the headers and Y-pipe. But that is purely speculation on my part.

 

stereomandan- I didn't mean to call you a "names". Just trying to get the beating of a dead horse done with

Ive seen quite a few guys gain a good .4 off and 4 mph with LT headers... Also, for street cars, general rule is 1 mph = 10 hp otherwise my LCA's and Torque arm netted me 50 HP

 

Ok well lets try to put an end to this discussion, I did the LT's 2 weeks ago, I only did LT's and off road Y-pipe.
I ran a best of 14.2 @ 102 before horrible 60' but in any case.
I ran these times consistantly, with of course a consistant crappy 60'
So I ran last friday and ran the times in my sig with equally bad 60' times. Take it for what it's worth but I think the header make a giant difference.
close to .5 tenths, and 3.5 MPH is pretty significant!

 

It's all good. Yeah, I don't know what I was thinking. You can't correlate tenths to HP because traction has nothing to do with HP, unless you have so much HP that you can't get traction.

Later,
Dan