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dual quad tunnel ram
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cron347
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Joined: 08 Apr 2007
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PostPosted: Sun Apr 08, 2007 10:12 am    Post subject: dual quad tunnel ram Reply with quote

can anyone tell me if i can run daul quad throttle bodies on a camed up 359 ..ando they make a harness for it?????

Last edited by cron347 on Mon Apr 09, 2007 2:15 pm; edited 1 time in total
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Big Dave
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PostPosted: Sun Apr 08, 2007 4:32 pm    Post subject: Reply with quote

Are you asking can you remove your EFI throw the wiring harness in the trash, toss your existing HEI computer controlled distributor and rip out the matching computer? Then after taking a car that is currently running; install an aftermarket tunnel ram manifold and two four barrel carburetors, with and aftermarket HEI distributor on top of an EFI cammed 305 cubic inch motor and expect it to run?

It might start but it will not be a barn burner by any stretch of the imagination. Bores are too small to breath, heads are too small to breath, induction system is a headache to tune but can be run on the street (marginally), and then the cam is designed for EFI not carburetors and will not let the engine breath. The compression will be too low to effectively burn the gas that two fours would dump into the engine.

Other than that, yes you can.

Big Dave
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Sun Apr 08, 2007 4:55 pm    Post subject: Reply with quote

in other words, dont bother with the 305.
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nwcc
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PostPosted: Sun Apr 08, 2007 10:49 pm    Post subject: Reply with quote

And don't run a single or dual quad tunnel ram on the street. Even though companies like Edelbrock have "street tunnel ram" They are not street friendly.
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clay
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1972 Chevrolet Nova

PostPosted: Mon Apr 09, 2007 4:54 am    Post subject: Reply with quote

I have a friend that has a tunnel ram on a Boss 302 and I'll have to say, once everything gets some heat in it (helps with fuel atomization some, I assume), drivability isn't bad. However, cold start is a royal PIA, especially if it's cold out and it takes a while to warm up and expect a small backfire when you try to crank it cold. I'm all for trying different stuff, but I agree with everyone else on this one, leave the 305 alone. Clay
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Wed Apr 11, 2007 9:57 pm    Post subject: Re: dual quad tunnel ram Reply with quote

cron347 wrote:
can anyone tell me if i can run daul quad throttle bodies on a camed up 359 ..ando they make a harness for it?????




am i missing something
what 305 is everyone refering to
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Wed Apr 11, 2007 10:01 pm    Post subject: Re: dual quad tunnel ram Reply with quote

squeeezer wrote:
cron347 wrote:
can anyone tell me if i can run daul quad throttle bodies on a camed up 359 ..ando they make a harness for it?????




am i missing something
what 305 is everyone refering to



Quote:
Last edited by cron347 on Mon Apr 09, 2007 2:15 pm; edited 1 time in total


typo on first post

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Big Dave
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PostPosted: Thu Apr 12, 2007 5:47 pm    Post subject: Reply with quote

The original question before it was edited was: Can I mount two carburetors on a tunnel ram a top my 305 in my íTBI equipped '89 Camaro? (I am paraphrasing from memory).

Each two barrel TBI throttle body requires it's own separate computer. You can not splice multiple TBI's into one harness because of impedance, resistance and frequency problems with the harness if it is attempted. The '84-'86 Corvette used to have dual TBI injectors on what looked like a cross ram manifold (looks can be very deceiving). The TBI's used were single injectors so the computer was still controlling the maximum number of two injectors that it was designed to control.

Theoretically you could use an aftermarket Quad control computer to control two GM style TBI injectors (mounted upon a true cross ram if so desired) and that might work. The other alternative would be to use two complete separate systems with dual distributors (just like used on a top fueler with modified heads to support two plugs per head).

Failing in that you would have to design and build your own EFI system, harness, injectors and computer circuitry; OR you could slap on two CARBURETORS and tune everything with a screw driver (just donít do it with a SBC 305).


Big Dave
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alfonsothefons
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1978 Chevrolet Malibu

PostPosted: Thu Apr 12, 2007 6:15 pm    Post subject: Reply with quote

if you decide to , diy fuel injection is the ans for you

this site has a homemade controller that might fit your needs
http://www.bgsoflex.com/megasquirt.html
anything is possible Cool
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Thu Apr 12, 2007 9:59 pm    Post subject: Reply with quote

i suppose you could put two Holley Pro Jection systems on it. not sure how easy it would be to tune though.
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nwcc
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PostPosted: Thu Apr 12, 2007 10:12 pm    Post subject: Reply with quote

I saw this stuff years ago and maybe it will help. It appears that they use 1 ECM



$1949
and



$1599

http://www.turbocity.com/default.php?cPath=16_21
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Thu Apr 12, 2007 10:53 pm    Post subject: Reply with quote

nice find nwcc. they even use the GM throttle bodies. IMO much better than the Holley/Chrysler versions. they also custom tailor a "chip" for your application. beats the hell out of adjusting a Pro Jection system.
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tyrfryer
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PostPosted: Wed Apr 18, 2007 11:01 am    Post subject: Reply with quote

That turbo city piece looks trick, but if you can get the same performance easier & cheaper with a single, what's the point? Confused
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Wed Apr 18, 2007 4:37 pm    Post subject: Reply with quote

tyrfryer wrote:
That turbo city piece looks trick


Wink

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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Wed Apr 18, 2007 11:02 pm    Post subject: Reply with quote

IMO if you want fuel injection, make the swap to an LS1. The motor is sweet and the conversion isn't too bad (Provided you don't keep the A/C) . Get a 6.0 vortec and swap the L92 heads on it. With a cam upgrade you can make some sick power. This is on my to do list except I plan to reduce the compression and run a couple of hair dryers on it. Very Happy
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