whats wrong
 

I raced a buddy of mine tonight and i didnt pull him like i thought it was the same as before i added the mods. Running stock cam still.

Ive added GT40 heads, TFS intake and 1.7 roller rockers. And my car is not any faster!!!!! I have the stock cats on the pipes but i dont think that would choke it that bad!!! I have hooker headers on it and 2 chamberd flowmasters.
What could be wrong? Not enough fuel pressure? I have a 190 pump, but im using a stock regulator... Im stumped!! please help!
:(

What size tb and maf do you have? you know im kinda in the same boat, i added ported gt-40's, and e-cam, i went 13.25 with stock intake, before those mods i went 13.27?:( doing some tuning, and adding a better intake my car feels stronger, i dont know what to tell you at this point, except play around with fp and timing, did you keep the stock springs? have the heads been milled?

im not too happy with the gt-40 heads, i do need better springs though.

my car seems to like about 44 psi vac off on fp, runs strong with that.

hmm
 

I have 70mm TB and egr, 73 C&L, hooker headers, flowmasters on it.
The heads have had a 3 way valve job, milled .010, Double springs, pocket ported. Fuel has the be the problem! I cant belive it runs the same with the mods i have added.

My heads have the same work except for the springs, i didnt feel a huge difference in my car, but my dad rode with me and said it felt stronger, only way to know is dyno or track, seat of pants is hard to tell unless you spray it with a 150 shot:D

btw, where in tx you from?

hey
 

Are yout still running the stock intake? If so that is choking you!!!
But we might have the same problem, i'm going to take mine in next week and see whats wrong. Oh and moving to san marcos this week.

You know what i have noticed this, everyone running the 73mm maf seems to be having issues. They are also not seeing that much in increase in times. I am going to try a 76mm and see what happens. They key is timing and fp. I am running close to 24 degrees of timing and the car still wants more...

later

Re: hey
 

Oh man, im not far from sm, let me know, we go to san marcos every sat for some cruising, hanging out, im closer to new braunfels, shoot me a pm when you move.

hey on the subject, try replacing your fuel filter, i did that today and the car woke up:) then again i ran my tank dry a few days prior, that caused the filter to clog.

Re: hey
 

I can fix that for $100 + $30 shipping by porting the lower. Many references if your interested - pm me. :cool:

Here is a pic of my work

Mine has no Trouble. Ok Step one, get a Fuel Pressure Regulator and a guage. This is probley the single most important tuning tool you can have. Second, Get a Shift Lite. Consistant shifts are a must for tunning. When I first put my current combo together, it went 101MPH. Sad Eh? With 19# Injectors I am running 48PSI of FP. Stock is only 38psi I belive. It will take some time to get it right, but take it to the track every week and play with it. My timing is 16 and my shift lite is set to 5600RPM.

A buddies combo alot like yours except he has a ported stock intake compaired to your TFS, he went 105.66 with no shift lite and no FP guage. He just got his guage and his regulator was set to 44psi. He is getting his shift lite sometime next week.

Hope this helps.

Are you using the proper length push rod?

E

wow
 

Hey guys, Yeah i got a kirban Adjustable fuel pressure regulator, and a guage comming on wed ! :) :) :) 44 psi you say? im gonna try 40 psi first, I also slapped on the offroad H-pipe on today for more flow, what should i set my timming at? is at 13 right now.
Also using stock pushrods with 140k on them hahah! they were in good shape. Oh and i replaced my fuel filter last year, and replaced my pump a month ago.

Now remember, all guages are different. 44 psi on his guage may be 40 on yours. Just slap it on and take it to the track. Change 1 thing at a time. Id say set timing to 15 and FP to 40psi. Make that your basline. Than just change FP in 1 PSI incrimints(cant spell). Keep doing it till the car gets slower, than go the oter direction with it. DONT FORGET A SHIFT LITE!!! It is very important from a tuning standpoint. Plus it just is plain cool!!:D

ok
 

sounds good.
Hey when i was putting the rockers in last week, On a couple i guess I didnt get the pushrod lined up right on the lifter and rocker, so when i was tourqing it down, it made the spring close reall far, then the spring popped up and the push rod went into place!!! I hope i didnt damage the cam or the lifters. The motors running fine, but I dont think that would hurt it would it? hope I didnt bend any pushrods either! anyone ever do that? when putting there rockers on by accidenT?

Ok, if the crank, rods, pistons and heads are the heart of the motor, then the cam is the brains. Get an E, F, or TFS stage 1. Your slowing down because the air velocity is slowing down dew to the increased volumeteric efficiency of your induction and exhaust systems. Your cam simply can not keep up with the new found potential of the induction and exhaust systems. Air is moving to slowly through your motor. Remeber, a motor is nothing more than an elaborate air pump. The goal is to get as much air in and out as quickly as possible. All the components must work in concert to achieve this. If any one of those mechanisms is not up to the task, you will be slower. Rasing the fuel pressure may help. However, adding more fuel might only compound your current problem. In my opinon, your TB is to big for the application. A smaller TB and a larger mass air would yield greater results. Also, I think a larger cam is the cure for your horsepower woes. Sorry for the thesis guys. :)

Why I agree that a cam would be good for his combo, my stock cam is not slowing me down one bit. Almost 110 mph in the 1/4mi and 300HP to the wheels with a stock cam right here.

hmm
 

Yeah i was afrade of that, I didnt put a cam, in i was on a budget, and it was more work to do it, I spent more on the heads so I figured that those would make up for the cam. I'll find out when i get my guage in so i can get my regulator on.

I was reading some flow data for the GT40 heads, and from .500 lift to .600 lift, the increase in flow wasnt even significant, now thats just on the flow bench, probably with the valves open a bit further, dont know if that takes account for the duration. So is the cam really gonna help....

http://www.jason.fletcher.net/tech/f...a/castiron.htm
http://www.jason.fletcher.net/tech/f...a/aluminum.htm

take a look at these, some good input! When you decide to choose some heads, Eveyone thinks ohhh AFR!! those are the best out of the box heads, well i dont know about that buddy... :D :D :D
Edelbrock ???