RPM in garner did the tune not saying they done anything wrong.

 

Your suggestion on a good cam please?

 

Yeah, your cam seems a little bit small. Im not expert so Ill let someone else direct you to what you would need for your persional goals

 

He told me there I needed some bigger headers and I forgot to mention I had an 02 sensor that was bad. We replaced it there but didnt put it back on the dyno because he was sure that was fixed.

 

I havent seen anyone who can tell me what the specs of a g5x4 cam is so how do I know what a bigger cam is?

 

It's about the size of a TSP MagicStick 3 or 4..

You could get something like a TSP TexasGiant... Thats what my buddy runs in his 402. Makes 493rwhp in a C5 with shitty heads...

A bad O2 sensor will cause all kinds of issues... car to run like *** and lack power.

 

I would pay a custom grinder. Ed Curtis would probably get my business. Bret Bauer on these boards has a good rep as well.

Nate

 

Here's my take at it, don't buy anything yet. Try to fix your current problems first. Make sure everything is right with the tune. Then start upgrading the necessary, then move on to other upgrades. Don't do everything at once or you'll never know what fixed it. Take it one step at a time. Throwing nitrous at it or other power adders isn't the most logical. You obviously have some issues on your hands and we can sit here all day/night telling you what it COULD be, but that is something you need to take back to your builder/tuner and let him figure out, especially since you paid for it. Too many variables, too many possibilities. Summary-Troubleshoot, fix problems, and then upgrade.

 

It will pick up alittle with some miles. I would get headers first. Even with mismatched parts I would of expected better numbers.

 

I've made over 510 rwhp with a 238/242 xer in a 408. I doubt it's the cam. Exhaust is a major issue, fix the basics then let's see what's going on.

 

something is definitely wrong. my old FMS 408 with stg3 317 heads and a 246/250 630ish lift cam made 535/501(45miles on it at time of dyno) through a LS2 intake/Fast 90mm tb....37lb injectors. and was on a safe 12:1 a/f through an M6 12bolt /w4.10s. and full true dual xpipe setup.

 

Has anyone else noticed that he said is trap speed was about 94.5 in the 1/8th mile? Thats pretty good for an all motor/full weighted car. What is that, about like 118 in the 1/4 mile? Sounds like the motor is putting down the numbers that it should. Try one of the calculators (I used this one):

http://www.nationaldrivetrain.com/calcs/dragcalc.html

You never stated whether this was on a mustnag dyno or dynojet? Big difference. And those were probably uncorrected numbers as well.

I wouldn't put too much stock in dyno numbers. Take it to a 1/4 mile and see what she does. Throw some skinnies on front. That should be good for another .1 or so...

 

Not sure what your calling "killing" DCR, but he should still be above 8.0 with that cam. Even with bad DCR, the motor should have pulled out on the big end and it didn't. The 2 biggest factors here are: MAC's SUCK, and oil in the intake sucks. Not to mention he didn't re-dyno after the fixed 02 sensor, but then how do you tune a car correctly with a bad O2 sensor?
I hit damn near 118 with my stock car and some skinnies. A 400+ cube car should hit 120+ easily.

I guess your agree'ing with me? Because you said the same thing as me?

 

So is everyone that bought l92s worried. This post blew up fast. My auto 408 being light at 3200 traped 134

 

I would expect him to trap 119-120. I think the oil consumption through the PCV is the main issue here.

Nate

 

Yep!! To many possible issues going that cloud up the results.

I'm not worried one bit about my L92 head purchase.

 

i wouldnt, unless your mismatching parts, your gonna have a good thing with the L92 combo

 

does anyone have results yet

 

when you find your lost power you are going to need larger injectors. what size do you have?

you seem to have a serious mismatch of parts. a motor build isn't worth doing unless you do it right. not trying to be an ***, but you need a lot of time/patience to do it right and you seem to have thrown it together somewhat half-***.

1. get the dyno graph and a/f ratio and see if it indicates a problem. post it here for input
2. fix the oil problem and see if that helps.
3. get some larger injectors, they will obviously not support what this motor SHOULD make if they are at 90% now.
4. get some decent headers on there.

JMO!


also, we are kinda assuming it is a dynojet. please let us know if it is a dynojet or mustang dyno.

 

Stock fuel pump isn't going to do it If I tried doing that on my setup the owner of the shop I get my work done at would have slapped the $hit out of me........ get in touch with lonnies performance and pick up a racetronix dual intank pump setup, then ****** up some ls2 rails,42# green tops, 1 7/8" LT's, yank the maf off THEN get it tuned and report back. and Also please keep in mind that your setup wont produce the kind of numbers you see coming out of 6 speed cars. If you decide to do the above and aren't satisfied with your numbers at that point: you know you are only a cam swap away from attaining the numbers you DO want... But right now your setup is lacking in certain areas (to achieve the numbers you we're throwing around)


Good luck with this and keep us posted......

My L92/L76 408 should be done in the nexr couple of days.... then I just have to break in the motor.


Damian