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Forced Induction This section for the traditional Pontiac V8

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Old 09-01-09, 01:38AM   #46
turbo69BIRD
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I was at 1.5 inch with 3.8 flared at the end 90 deg into the hat on primary and 1 inch straight up on the secondary if I remember correctly. I'd have to pull the carb back out.
Right now I am trying to decide if I go EFI or carb again.

Its a tough descision. I have most of the EFI stuff alrady and still have my carb
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Old 09-01-09, 01:42AM   #47
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I'm pretty happy with the carb.
To get it to run right on a 5spd is probably not too easy.
My rpm varies so much more than an auto...and downshifting and powershifting, etc etc


I'm sure EFI would be 'better', but might take even more energy.
I've heard a lot of horror stories about EFI being no easier to tune, and simply costing a lot more $$$ before people gave up
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Old 09-01-09, 01:45AM   #48
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WAY more money. Defiantely better but thats cause Id have Job spetter tune it.

THe problem is I am already 90% set up for the carb again.
The fuel inJ needs new Ignition, wiring, Tuning, upgrade the fuel system etc etc.


Once its set up though it would have a killer timing curve and fuel curve and would make a ton of power
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Old 09-01-09, 01:46AM   #49
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Well, in theory, i guess.

If you've got someone that can tune it that well, for sure....it's probably a good thing to do
Superior in just about every way

But the few people I've known that have tried it...ran into serious problems and couldn't figure them out. Just ended up spending a lot of $$
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Old 09-01-09, 04:19PM   #50
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Quote:
Originally Posted by turbo69BIRD View Post
WAY more money. Defiantely better but thats cause Id have Job spetter tune it.

THe problem is I am already 90% set up for the carb again.
The fuel inJ needs new Ignition, wiring, Tuning, upgrade the fuel system etc etc.


Once its set up though it would have a killer timing curve and fuel curve and would make a ton of power
You have every thing already. All you need is to upgrade the Fuel and have it tuned. Ignition is all there.
No more excuses man, just do it!
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Old 09-01-09, 10:47PM   #51
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Yeah yeah yeah.

I know just do it.

I usually tell everyone else that but I need to get this thing back up and running soon and time is getting tough to come by right now.
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Old 10-14-09, 07:15AM   #52
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What would be more helpfull would be an article describing how to do all the more serious(and common) blowthrough carb mods that are usually necessary for mid to high boost setups. Vent ?????,blocked hsab's, blocked/recalibrated emulsion holes,increased main well passages,boost operated power valves(commonly called brpv's),booster replacement with annular,necessary size of needle/seat assemblies at certain hp levels, hp levels when dual inlet float bowls are necessary,ifr mods to improve transition,Dominator mods etc etc.
I know most of this info can be found on the turboforum site with a bit of diligent searching,but it would be nice to have it all in one place.
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Old 10-14-09, 07:29PM   #53
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Agreed. It'd be nice to have every orifice on those things marked...with the results of what changing them had as an effect.
I'm about to change some air bleeds. I'll report what that does
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Old 10-14-09, 08:16PM   #54
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Brent was supposed to be Doing a DVD of just this sort of thing but I am not sure if it ever materialized.
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Old 10-21-09, 10:45PM   #55
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who else blocks their HSAB's on the metering block?

...what I'm messing with, as of late
and BRPV's +/- changing PVCR's
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Old 10-22-09, 12:01AM   #56
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Clay Mine were not blocked but Drilled and tapped for adjustment.
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Old 10-29-09, 04:43AM   #57
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I've spent all week cussing at the air bleeds (and brpv's...which I've decided to try making)
I'm talking mostly about the lsab's
My HSAB's are blocked....which is one of the best things I've done to the carbs. I see no negative effects, but more fuel at the top end. I'd highly suggest this modification


Right now, I have an issue with too much fuel at low rpm or idle...and not quite enough up high. Typical
Blocking the HSAB's will block the air from the metering block....and give you more gas up high. open up the HSAB's and you'll lean out, up high.

...as for the lsab's...
I hear it's the opposite. Open them up...and you'll lean out at idle. Close them for more gas at idle.
After many hours and tons of drilling air bleeds with a custom drill bit kit i bought (#1 bit to #60 bit)...i've concluded that it isn't worth the effort

This all applies to my own setup, of course.
I changed the primary lsab one drill size larger with success. It leaned out my idle air fuel about .3 and seems to start easier. I think the manners are slightly worse, though
I have a holley HP main body, lsab's were 75 I believe, stock. I went one size larger (the drill bit that fit....a #48 I believe...probably a size 78 air bleed or so)
I tried one size larger drill bit than that...and dropped .5 or .6 air fuel but lost a lot of street manners. Car surged and was quite nasty


I tried changing the secondary LSAB's and even one drill size difference made a similar effect - murdered the idle. Felt like I had a huge cam in the engine..loping and having issues



I'm going to do a bit more testing to see if I like the stock LSAb on the primary...or one change larger...but it isn't a big deal either way as we're talking a .2 or .3 difference...
I think i'm going to end up with the stock air bleeds.


For the hell of it, I tried changing the LSAb's radically (3 or 4 bit sizes...10 or 15 # sizes, I imagine)
The car would barely start
So, just as you read....low speed air bleeds are touchy and only for FINE tuning. Probably not worth your effort, in my opinion
That doesn't mean that you might not have a problem with lsab's....maybe yours need changed. But it appears the 'stock' ones were the 'right' ones for me

High speed air bleeds, on the other hand....highly recommended to block
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Old 10-29-09, 08:44AM   #58
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funny thing is that those are all the same issues we have been working on with the Gen 7 DFI. Its really NOT any different than a carb the only difference is that you work on your computer rather than lifting the hood.

Seems like 6 of one half dozen of another if you ask me. the big plus is the timing curve and datalogging IMHO
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Old 10-29-09, 04:56PM   #59
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Is the program/tuning user friendly??
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Old 10-29-09, 06:56PM   #60
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I didnt think so at first. But after being walked thru it by some buddies it seems pretty simple now. I think I was making it harder than it was kinda like when you first got a computer and you were afraid to touch anything for fear it would blow up on you or something.LOL
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