Fueling Method Choices

[rztmartini]

Hey guys. this is a question from my dad. he is getting the 3.2L Rebello engine built as we speak. he had bought the AZC 4-barrel manifold and a 390 cfm carb for his old L28 before he decided that he wouldnt have enough time to build an engine, and have one of the best do it for him. heres the dilemma...

 

the 390 cfm is maxxed out and Dave at rebello is wondering what he wants to do.

• go for the big bore SU's ($800)
  
• tripple carbs ($1800)
  
• but a 600 cfm carb on there

those are the choices that dave presented him with. he could also:

• N/A FI (Megasquirt or Wolf etc...)
  
• turbo ($wholelotta$)

he wants to break the 300 hp N/A mark and have more torque than that...

with turbo, he would want to get at least 400 hp.

 

need some advice! thanks for the help!

[rztmartini]

well we went with the 600 cfm to see of that works better...

 

thanks for the help everyone! [/sarcasm]

[Pete84]

Curious, how has the 600 cfm run compared to the 390?

[z-ya]

The primary decision is EFI or carb. The difference is dramatic.

 

I spent Saturday helping to tune a Rebello 3.2L with tripple Mikunis on a Dynpack dyno. We spent a lot of time switching main jets, and drilling out air valves, and finally got the mixture right between 4000RPM and 7000RPM. Between between 3000 and 4000RPM it goes pig rich, and there isn't much we can do about it with carbs. With EFI, we could tune that area out to get the best drivability. May get a bit more torque down low too. Below 3000RPM it is way lean.

 

Not sure why the engine made 304HP on Rebellos engine dyno, and only 222HP on the Dynapack. I was expecting between 250 and 260WHP from the 3.2L. This engine makes it peak power around 6500RPM.

 

I've used this Dynapack a lot in the past, and can say that it's HP numbers are very accurate. Although it does measure less than a Dynojet.