Ok, here is my problem. I usually work on and race very high horsepower cars and trucks and mostly all of them on large doses of nitrous. Now i am having fun working on my little "hot rod" 03 chevy lol.

In our race cars, especially with large engines and large doses of sauce, the tighter the converter the better. With this 5.3 liter, would that be the same case?

Would the truck run better with the stock converter and 100 shot? Or better with a 3-3500 converter and 100 shot?

Lets say its a 5.3 with a 224 228 580 lift on a 112, headers, true duals with magnaflows in a RCSB with 4.10 gears and 28 tall tires.

What is your personal opinion, and have you noticed anything in any of your 5.3L racing experience that you could add to this thread?


I am torn between the two choices because...

I have always said the tighter the better when it comes to converters and nos.

BUT, these little motors are so "peaky" when it comes to horsepower curves that i would think the rpm range would need to be kept high and you would need a decent converter to keep the rpm's up during the shift and at launch to keep it where its happy.

 

for a bolt on 5.3 i would think 32-3400, could be triple but seen quiet a few people running single disc converters, serious horse power then i would think a 4k triple would be needed

 

i would agree with ya if you are going to buy one just make sure it is a good name and when you do just tell them the run of the motor and size of the shot they will be able to tell you what you need just let them know how you want it .it is just like the old carb motor when it comes to that part of the table.

just to say if you were to get a 3200 then add spray to that it will flash around 3600.if you have a 3200 for the spray then you would only flash around 3200 with the spray other than that it may only flash to 2800.

 

we ran close to what you describe. A 224 cam with stock 243 heads from my zo6 on the stock 5.3 iron block. 410 gear and my same yank 3600 stall. Tires were 25.5" MT Drag radials. It ran 12.88 @ 105 mph

http://s160.photobucket.com/albums/t...t=Kyle12-2.flv

Later went with a 75 shot and ran 12.06 @ 111 mph

http://s160.photobucket.com/albums/t...ent=Kyle12.flv

 

Most guys love throwing huge converters behind these motors. Nitrous or N/A. Mid 3000 converters are very common. Plenty of guys in camaros, birds, and these trucks put 4000 and up converters. Point is a tight converter doesn't help anyone because these motors like to rev high.

 

just be careful to loose of a verter with spray will just be a waste

 

I personally think it comes down to suspension, a 3800-4000 plus nitrous would be awesome off the line but it wont happen if you dont the suspension to hook with it

 

yes you are right,but you can't put a 3800 to 4000 n/a converter in the truck then put 150 shot on the truck the converter will flash to 4500 to 5000 grand.as long as the converter going in is for your set up it will work if you are going to spray it then get a converter for the spray.now if you get a converter builded for spray and it is say for 125 shot and you put a 175 shot later it is not going to be that different so it can and should take it traction may not but all in all the converter will work.