Hey guys with whats in my sig on a decent tune but not great and with terrible exhaust I managed a 12.7 at 107mph. Now I woudl like to hit liek an 11.8 with this car. What do you think I would need to do that?? I am thinking about pulling the heads off and polishing the exhaust side and maybe milling the heads to bump the compression a bit. would I have to get the intake milled if I did that?? thanks guys, and it was on bad drag radials but they did hook pretty well.. thanks

 

Your MPH is good enough for high 11's, low 12's. Focus on suspension and traction mods. I'd leave the heads alone and find the true potential of the car with suspension mods. Then up the HP/TQ if you want more.

 

One thing you need to do is upgrade your exhaust system. You need 2 1/2 inch to the "Y" from the headers. Three inch from the "Y" to your gutted cat. Cat should be 3". Then continue the 3" back to the muffler. All mandrel bent of course. This is where to spend your meager funds. Otherwise you are not letting your engine breath to capacity. You can modify the intake and heads all you want but the exhaust gases have to get out. Allen

 

Your gonna need to find another 100hp to get what you want, all the exhaust in the world will not net you that, even with the spit shine on the heads and milling. Those heads cannot flow the amount of air needed to get the power you need for your goals. You do not gain much power from compression alone, it's in your heads/cam that you really need to focus. But unless your spraying, your goal will never happen with what your running currently and with your planned modifications.

If you have'nt already, drop the power steering for manual box and install an elelctric water pump or an electric over drive kit so the only thing your motor is turning is the alternator. This should solidly gain you .3-.5 everyday all day.

 

Dropping the PS pump will net 5-7 hp. The electric water pump won't do a damn thing except expty your wallet for an expensive unrealiable water pump that shouldn't be used any other place but the drag strip. What strain (which is little) that you took off the manual pump is now taken up by the altenator and no power is free. There is nothing to gain by doing an electric water puimp. It takes the same amount of power to drive it no matter if it is electric or belt driven.

 

Judging from your other posts in another thread, you really dont have a clue do you?? Have you actually done this and have the first hand knowledge to back it up?

I have and do. When I ran a small motor much as what the initial poster has I changed NOTHING BUT installed a manual box and electric water pump. ONLY 2 changes I made period. I picked up a consistent .5 and on really good air days at our other NHRA track picked up total of .8 from original baseline.

Again, we did this same swap on a freinds G body after we seen the amount of gain for little investment. Again he picked up a solid .4 all summer long and during the fall series picked up a total of .6 from original baseline with all the power sapping accessories.

Many other street class/sportsman racers were intrigued by our cheaply found ET gain and started swapping over. I dont have records on their exact ET history and amount of gain over the baseline, but when we'd talk the minimum I'd hear of was .3

If you already have a torque monster, or very very healthy engine you will not notice much gain, but on a stock type engine it's the little things that pay back big dividends. You you start out and have 600hp then gain 20hp you will not see as big or any improvement as if you had 300hp and gained 20hp since the bigger motor is already working at near perfect effiency.

Been there done this too many times and seen the results first hand. Just waiting for your smartazz remarks to start now.

 

have to agree.....swapping to a manual steering and electric water pump put me from 13.9 to 13.4 with no other swaps on an old setup. nothing was changed except different days at the track with the results being backed up over several occassions and seen others with similar results. On a much slower car, the gains are more apparent than a faster car which won't gain as much since it takes more HP to move a quicker car each .1 down the 1320

 

Well I know I can get in the 12.40 range with the car and new exhaust and getting it tuned, probably almost just from tuning by itself and not to mention all the new suspension work I have done... Now 4-5 tenths from porting heads, raising comprsion and some rollor rockers doesn't seem to hard to acheive. I mean I think I may just leave the compression alone cause after the tremec the next expensive thing will prob be a charger. But I thought it was maybe attainable to get there all motor till I did it. But hey thats why I asked, cause i'm not a genious and i'm not to stuborn to listen and learn.. Well what other things can I do to acheive 11's?? If I am going to change heads or somthing I would liek the see a solid mid 11's or its not worth it to me.. thanks alot guys

 

More cubes, more compression so you can spring for a bigger cam, and better heads.

Or you could pretty easily go mid 11's with a mild mannered BB too.