I'm looking to build one hell of a tbi 355. I have so far a holley 670 with the 80 pph injectors, holley fuel pump,crane 4x4 torque cam, 10.3:1 compression, holley projection manifold, prominator, aldl cable, headers, 3" single with 40 series flow, k and n with xtreme lid, and I'm currently saving for my afr 180 street heads, ebl and lc-1.

That would be pushing the limits of my fuel induction system at about 430 hp and 460 ft lbs.

I was thinking about going with a weiand 177 to add that extra pop which would give me about 500 hp and 500 ft lbs according to desktop dyno... I don't know much at all about blowers so I was wondering if you can use less fuel or if it takes more to support a blower. Basically what I'm wondering is can I use the holley 2bbl tbi to do this or is a 4bbl pretty much mandatory?

 

You can do it with a 2-bbl TBI, but not the Holley. Your best bet would be the EBL, 2-bar MAP, and 4 bbl TBI unit.

 

Fast, would two 2bbl TBI's fit on top of the Weiand? It may be another option. At high fuel pressure two SBC units would be enough.

RBob.

 

I don't think so, because the Weiand 177 has a single carb opening and the top plate is non-removeable.

 

I've toyed with the idea of some carefull trimming of two SB TB's to get them to fit on std. carb flange. You'll have to go to an external regulator and sacrafice one IAC valves, which probably isn't a bad idea. This would require some fancy fanangling to get an air cleaner on.

 

That pretty much means a 4bbl then. Other then tearing down the blower and milling out the top plate for another one. Thanks.

RBob.

 

Well, since I'm in cali I have to stay smog legal so I'm stuck with one unit. I don't even know If all these so called smog legal parts would be smog legal once you combine them. I would think with a c.a.r.b. approved tbi, cam, heads, and blower it would work with the right tune but I'd hate to blow a couple grand on something that I couldn't drive because of smog.

Basically I'm looking to make my truck competetive in a quarter mile(mid 14's), smog legal,with awesome torque as this is a 5000 lb 4x4 with 35 inch tires, all without blowing the thing up (2 bolt mains). I think I'll probably stick to the afr n/a setup... it'll have Plenty of power but I think a stroker crank, mechanical flat tappet lifters, and roller rockers will be in it's future. I know chevy sb have been tested to handle 500 hp and beyond so 450 should be fine. But will the holley handle 450 hp with say 27 or so psi? How would that much pressure affect the life of the injectors etc?I know I'm kind of rambling here and imaginary motor building but I want to explore all options and find the best one without having to find it out the hard way. Its always good to have a plan.

thank you

 

I don't think that you will have a 450 hp motor with a smog legal cam n/a. Others are more than welcome to dispute this.



FWIW I think it would be great to have a TBI engine that would pass Calf smog that would be in that range.

Since you are rambling in the imaginary zone..................

 

thats your opinion... Mine is different.

Theres many tricks to passing CA smog... you have to be a little more mythodical about it to do something like 450 hp and be smog legal... by mythodical I mean a little additive called guarenteed to pass smog... also acetone can fool the sniffer and so can a few other little things... I'm going out on a limb here but I figure if its not smog legal swap out the cam and put one that is smog legal. My plan is to get a computer controlled cam from comp cams(the one I got my desktop dyno numbers with) that has small lift and dur. (212 dur 425 lift IIRC) and use the additives and family secrets to fool the sniffer. The afr's are street legal in 50 states and I beleive they are MUCH cleaner then the stock gm heads my 1988 blazer had from the factory. I dunno but we'll see. I'm trying to do as much homework as I can.

 

What cam measurements are you using on DD? One is more accurate than the other, and I do believe it is typically the one that shows less HP. It would be very tough to get 450hp out of a 212 duration cam, the AFR heads will def help but I think you're looking at closer to 400hp with a great tune.

 

206/212 .425/.440 at 50

 

DD2000 is more accurate IF you can get the .008" specs for your camshaft and select the appropriate cam profile to match your cams intensity. The newer DD2003 has an intensity calculator built in and gives a more accurate reading. Rod length is also taken into account on DD2003.