Hi.

Does anyone possess intake flow numbers for:
2.8 TBI (S10, X11 etc)
2.8 Carb(GM manifold)
2.8 Edelbrock 2bbl
2.8 Edelbrock 4bbl

I recently purchased new fiero, and it has:
3.4 camaro engine
2030 cam
mild porting
headers + dual exhaust.

The problem is the ecm and flow potential up high.

So right now, I have options:
TBI + MegaSquirt + insert_one_of_the_intakes_here
OR
insert_one_of_the_intakes_here + Carb.

TBI is one of the options, if the TBI manifold flows significantly better than the fiero one. TBI unit that can be acquired here cheap, will be off 4,3 or 5,0 witchever does the job.

On the cost side, I do not want to spend a lot of $$$, so if S10 manifold + porting + [3,4TBI+MS OR Carb] will give me 200bhp on the flywheel, I'm happy.

At one point, I was considering using the Edelbrock intake with the S10 4.3V6 throttle body (using an adaptor), and S10 TBI computer/wiring. I ended up just porting the Fiero intake. So I'm not sure if that custom setup would work. But if you do get it to work, it should solve the high-end airflow problem.

quote Originally posted by Blacktree: At one point, I was considering using the Edelbrock intake with the S10 4.3V6 throttle body (using an adaptor), and S10 TBI computer/wiring. I ended up just porting the Fiero intake. So I'm not sure if that custom setup would work. But if you do get it to work, it should solve the high-end airflow problem.

Yes, the 4.3 tbi will will flow enough to support 200 on the flywheel, but the main question is, is a minivan or S10 intake manifold up for the job after porting.
This is a cost issue, since new edelbrock bottom and top will cost me around 250$ incl. delivery, and S10 + porting will cost me 50$.

Megasquirt is also a cost issue.
To modify stock ecm, i would have to buy the catstuner program, definition file, programmer and some eeproms. ~200$ and still limited to stock ecm parameters if I want to add some kind of power adder in the future.
Megasquirt2 base kit without passive components is about the same price wise, passive components I could get locally and soldering is not an issue. Tuning potential is way better than the stock ecm.
As for carb, it would cost me carb and vacuum distributor, also both is needed to transport overseas. Not cheaper than the previous options.

So for me, it would be best to use minivan intake + 4.3 TBI, if the intake is up for the job.

The question remains, how much flow potential is there?

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EX: ('86 2.8 V6)
NOW: ('85 3.4 V6)

The stock throttlebody at 52mm is Pie(22/7) X radius squared which is about 3.24 sq. in.

A Holley 390 carb (most common one used) has 4 barrels @ 32 mm each which is or 1.246 sq.in. each for 4.98 sq.in. total.

Given that the 390 flows at 390 cfm, you can see the ratio between 4.98 and 3.24 total square area is going to be 65%, but the 35% increase is pretty big.

Oddly, the 65% ratio in square area does not hold when comparing cfm. Cfm on the stock throttle body is widely reported to be 318 cfm vs 390 cfm on the carb, which is 81.5% ratio.

Still, the Edelbrock intake outflows the stock intake and is, as I recollect, about 360 cfm. This makes a 350 cfm two barrel carb a pretty good match.

The Edelbrock intake outflows the GM intake alot by (if I remember right) about 15%. So, gains using the GM S10 intake will be limited if at all.

I don't have figures for the 4.3 TBI, but it will be a whole lot better than the Fiero intake and should work pretty well with the Edelbrock intake. Again, the stock S10 intake is not likely going to deliver what you want.

The 4.3 TB is newer technology and I expect it will work very well, but is more expensive than the carb.

Hope this helps

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quote Originally posted by Arns85GT: ......Hope this helps

+ for you. Thanks for the info.

If the edelbrock outflows the S10 one by a mere 15% then it is 30hp so no issue there, extensive porting and I should be on the same spot, as unported edelbrock. even if it does not meet my goal, I can test&tune the MegaSquirt on that.

Fog @ 600 $ on the intake is not an option.

Thanks Fog,

And after recalling a call I made to Edelbrock, I think the difference is not even 30 hp. I think it is really closer to 15 hp. FYI.

So porting the factory intake may well do as you say it will.

Arn

quote Originally posted by Fog: Hi. Does anyone possess intake flow numbers for: 2.8 TBI (S10, X11 etc) 2.8 Carb(GM manifold) 2.8 Edelbrock 2bbl 2.8 Edelbrock 4bbl I recently purchased new fiero, and it has: 3.4 camaro engine 2030 cam mild porting headers + dual exhaust. The problem is the ecm and flow potential up high. So right now, I have options: TBI + MegaSquirt + insert_one_of_the_intakes_here OR insert_one_of_the_intakes_here + Carb. TBI is one of the options, if the TBI manifold flows significantly better than the fiero one. TBI unit that can be acquired here cheap, will be off 4,3 or 5,0 witchever does the job. On the cost side, I do not want to spend a lot of $$$, so if S10 manifold + porting + [3,4TBI+MS OR Carb] will give me 200bhp on the flywheel, I'm happy.

why not spend the minimal cash and have a chip burned to wake up the potential in that engine ?
------------------

GT just waiting for the conversion

84 Fiero Turbo Vortec 4300 Phantom GT
L35 block, Syclone Intake and ECM
T31 turbine with T04B S3 compressor
super T61 waiting for next winter
www.cardomain.com/id/vortecfiero
Murphy's Constant Matter will be damaged in direct proportion to its value
Murphy's Law of Thermodynamics Things get worse under pressure.
Arthur C. Clarke "Any significantly advanced technology is indistinguishable from magic"

[This message has been edited by vortecfiero (edited 10-26-2006).]

quote Originally posted by vortecfiero: why not spend the minimal cash and have a chip burned to wake up the potential in that engine ?

Well, nobody here is skilled enough to do that, so I would need to order it from the states based on mods. If it works, it would be good, but i doubt it works on the first time. Real drawback is the flow potential with OEM intake, there just isn't.