Larger Holley Carb or MSD Atomic EFI?? Opinions?

[Strawdawg]

In my experience, the formula may be the most streetable when dealing with a double pumper, but going to a larger carb makes more power on the dyno and is quicker on the strip.  Most magazine tests seem to show the same thing.  For a strong 440-500, the 950 seems to work better than does an 850 when it comes to power.  Obviously, if you have a mild cam and low rpm, then it is wasted.

[BS CUDA]

Well I finally decided on the M1 intake and a 1000 CFM Holley. Just received the pieces and just have to drill the intake for vacuum as the carb has no ports and neither does the M1. Once this is installed and tuned to my abilities I am going to haul it to the Hat again for a test run. Then it is off to the dyno tune guy - he claims he should be able to pull 1.2HP per CI with this set up I am running. Man I sure hope he even just gets close 
 

[Chryco Psycho]

Cool Can't wait for the results !!
Is Race city closed now ?

[BS CUDA]

Yup Race City finished last October - done and gone!! Some rumors flying around though - maybe a new on by 2014/15. Only loose rumors though. I am quite certain this carb/ intake combo will be an improvement. Can't wait for the dyno tune!!!!!

[BS CUDA]

Cool Can't wait for the results !!
Is Race city closed now ?

 Well the official 11. something hunt is still on as it definitely was Friday the 13th. Finally ran the car in Edmonton last night in their Friday night street legals with the new M1 intake and 1000CFM Holley. After solving a couple of richness issues and running consistently dissappointing 12.10, 12.12, 12.07,12.01, it seems the car will not give me my DOCUMENTED 11.something that I know it can accomplish. On the 5th pass after firing the MT's hard and cutting an .034 light the car hooked hard and felt real good. When I went to retrieve the time slip they told me there was a glitch and no slips were printed for the pass(I heard other complaints of this happening from other drivers throughout the evening).When my wife and son met me in the pits they were ecstatic saying the car finally did it - they tell me the board read 11.80 in my lane - HURRAY!!!!!!!!! - except no time slip to prove  it  :banghead  

[HP_Cuda]

Well let's hope your contingent had it on video, I've had that happen on several occasions where you want the timeslip and no dice.

I have to hand it to Chryco, as I was talking before about VE but it really depends on the engine build.

There is a comp cams dyno application I was playing with and found when I hit 950cfm with my setup I was maxxing out hp and torque, if I tried a 1000cfm carb I barely gained anything so the morale of the story is how the motor is built. If it's pretty stock than the VE calc will be pretty close to right.

 

[Chryco Psycho]

Well let's hope your contingent had it on video, I've had that happen on several occasions where you want the timeslip and no dice.

I have to hand it to Chryco, as I was talking before about VE but it really depends on the engine build.



 

Congrats on getting the gains , I hope there is some more left in it yet 
 Thanks HP , no hard feelings , I have just been down this in the real world before & no matter how you slice it the formula is flawed , it is interesting to reprove the facts !! Why big carbs work I am not sure but at WOT you want to be close to zero inches of vacuum & there is a lot of unrestricted air flow when that happens , carbs are not tested at close to 0 inches so maybe that is where the formula misses .

[TROUBLE987]

Just my I dont have the MSD atomic EFI, but I recently added FAST EZ-EFI to my car and recommend it to everyone. I went with the FAST system because it was cheaper and had been out for a while so it is well tested. The MSD kit plugs into their ignition system and doesnt require a return line, but I don't think the return line-less system is a positive thing. Anyhow, the EZ-EFI kit is one of the best modifications I have done to the car - it smoothed my idle out and the car runs/drives a ton better, the tune is 1000% better than it was with my carb. It is really a night and day difference. Thats not to say it doesnt have a few drawbacks (mostly $$$$). I also wouldnt recommend the kit with the external fuel pump as it is overly loud in my opinion (to the point where Im going to an in-tank fuel pump). That is my only real complaint, everything else has performed beyond my expectations.

I'm looking at fuel injection now..did you buy a kit and if so where from?also you got some pics?

[BS CUDA]

I'm looking at fuel injection now..did you buy a kit and if so where from?also you got some pics?

I went with the bigger Holley and M1 single plane intake. MSD basically told me they couldn't gaurantee as good of performance at WOT as the carb. I like to drag race the car and shaving tenths is what I aim for.

[TROUBLE987]

Bs cuda what's WOT...?

[Jamiez]

WOT = Wide Open Throttle

[TROUBLE987]

WOT = Wide Open Throttle

Oh lol...thx Jamie