Can the Rochester TBI injector pods be used on a Holley 670 TBI unit? If so, what modifications need to be done (if any?)

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1992 RS
327, Modded TBI, Rebuilt WC T-5 5-speed, PRO 4 15" rims, Nitto's, 3.73's, SLP 1 5/8" headers, and a few other things.

 

yes they can, thats what im currently running


youll need an injector pod spacer and some grinding on the back of the throttlebody where the fuel line fittings go. Youll also need to drill and tap the hole for the aircleaner stud

 

Pablo since the subject of the gm injectors on the 670 has come up, planning for later mods to a 9.5:1 vortec 350, how do you think that this injector setup with the 90lb units will work with a vortec victor jr intake and gm hot cam? I know that you are an advocate of the single plane intake for tbi units.

 

It seems like you have read my mind on a really great setup i've yet to see anyone do. In fact if I came across a 350 thats probably the same buildup i would do to the letter. So yeah, i like the idea alot id love to see you try it. Course it will take some doing on the chip side.

 

How is a single plane better then a duel plane for the TBI?Does the fuel atomitize better with the air or something? Wouldn't a duel plane make more low end torque, or it there something I'm missing here? Just curious, I never really gave that a whole lot of though.

As for the pod, you wouldn't happen to have any pics of that would you?

Thanks!

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1992 RS
327, Modded TBI, Rebuilt WC T-5 5-speed, PRO 4 15" rims, Nitto's, 3.73's, SLP 1 5/8" headers, and a few other things.

 

There are a few reasons i like single planes

- They are more responsive when it comes to engine speed changes
- have far more breathing potential than dual planes
- are much better for tbi than carb because Carbs lose alot of low end on a dual plane because of decreased vacuum signal. Since this signal is what atomizes the fuel it has crappy low end. TBI injects the fuel at the same pressure at any rpm.. less low end loss
-To me, i think dual planes are a waste of time if you wanna go fast, all that tuned runner business really only works in a very very specific rpm band, and it hurts everything else in the process. Its great if you use the car to tow or whatever but since most of your quarter mile should be between 4000 and 6000 why even bother getting more power on the low end when you only see it once (as tire spin)

my 305 has unbelievable amounts of low end with what is supposed to be a soggy combination, in first gear at any rpm from a roll with no clutch action it will spin the open rear all through first and pretty much almost all through second.

 

Any V-8 motor will spin an open rear-end axle in first gear, man...

 

LOL, you know he's right Pablo, time to get posi.

I can see why you would use a single plane now, makes sense. Too bad I'm going with duelies, or that's what I would use.



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1992 RS
327, Modded TBI, Rebuilt WC T-5 5-speed, PRO 4 15" rims, Nitto's, 3.73's, SLP 1 5/8" headers, and a few other things.

 

well you might have a point, ... man
i know a guy who has a supposed high torque combo, l98 cam, swirl port heads, dual plane manifold etc
and he couldnt spin his open rear in first at all unless he used the clutch to help him out

we are talking about a 5 speed here, no torque converter flash up like an auto has (an auto is a completely different animal when nailing it from a roll because of the tq converter flash), and this was a high 14 sec car at the time. Granted his gears were numerically lower but it didnt let out nary a chirp as i recall

even so, i dont have a trailer hitch so i cant really tell you how much low end torque it has
can you forgive me... man?

[This message has been edited by Pablo (edited November 01, 2000).]

 

Ok, man. Get a posi and your fun factor will go up 10 fold (sideways posi/spool burnouts better than one-lighters any day!), never mind your track time improvement(s)... What's up, homeY?

 

Not much.... Man

 

FYI, a stock T5 RS can't spin the tires from a roll, unless the tires suck.

I have a 15.6 T5 RS, 255 50 16's open rear, I can't break it loose unless I punch it at 2K, at a roll, I just bog and accelerate...

 

Damn, that sucks. My RS can spin both the tires from a roll without any clutch help, the tires are 275/50/15 Nitto Drag Radials. Don't get all worked up though, it's not your everyday L03, in fact it's not even a L03, so I guess that doesn't count does it?

BTW, off topic, I was reading a little fight over 305's VS 350's. The only reason 350's have more potential the a 305 is because of the 4" bore a 350 has. You can use bigger valves, and more flow= more HP. The stroke is the same. A 305 isn't a POS engine mind you, I've seen people build these up and they can be mean little 12 second monsters with the right equipment and know how. The only draw back is cost effectivenes, a 350 is more common and parts are cheaper then a 305. If you already have a 305 and want to build it up, that's fine, but if you need a new engine, I would suggest a 350, there is no replacement for displacement (except for N2O or forced induction, but lets leave those out of this).

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1992 RS
327, Modded TBI, Rebuilt WC T-5 5-speed, PRO 4 15" rims, Nitto's, 3.73's, SLP 1 5/8" headers, and a few other things.

 

Ive always been able to spin the tires on my 92 rs auto. I lost the ablity to do so when i had both the muffler taken off and the 454 tbi on. BUT, that was in colorado where i was a couple thousand feet higher and lost quite a few horses.
The 454 tbi with the muffler on, here in the heartland will spin em from stop, and if i punch it at 30, they will completely break loosed too for a couple seconds. Its makes for rather dramatic effect.

Im pretty sure i dont have posi, but it is limited slip isnt it? I mean they will both spin, but not with the same power. I dont know what rearend i have, but im sure its stock.

 

Auto cars are different.....

 

Hey Motley!

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1992 RS
327, Modded TBI, Rebuilt WC T-5 5-speed, PRO 4 15" rims, Nitto's, 3.73's, SLP 1 5/8" headers, and a few other things.

 

Auto cars have a torque converter, rpms flash up
different animal

 

Converter flash up. Good or Bad ???

 

good, thats why you change to higher stall torque converters, they flash to higher rpms

so say you launch your car, your converter will slip up to about 1600 rpm
and then it hits when it tightens up

an upgrade to a 2500 stall converter would "hit" at around 2500 rpm so its sorta like dropping the clutch higher
course youll need better tires

 

sh*t i cant keep traction in the rain with my tires, and if im on a sloped corner or something i cant keep the tires from squeeling. ive got bfg radial ta's. and one mismatch hard **** on the right rear from when i blew the bfg peeling out of the tt bar.
If i got a higher stall converter, id probably get stuck on flat dry concrete.

 

lol you need posi like me (and if you do have it, drag radials!)

 

Posi, drag radials, and a high ratio, can't go wrong.

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1992 RS
327, Modded TBI, Rebuilt WC T-5 5-speed, PRO 4 15" rims, Nitto's, 3.73's, SLP 1 5/8" headers, and a few other things.

 

how do you think that this injector setup with the 90lb units will work with a vortec victor jr intake and gm hot cam? I know that you are an advocate of the single plane intake for tbi units.

Best SBC single plane that I've run was a Weiand 7525, real nice manners and has an EGR valve pad, painted black really stealth
90s take work on a 355 SBC
Wound up using two Fuel Pressure Regulators
one vacuum referenced (one acts as a limiter, since there is too much range in PSI).

 

Grumpy, on behalf of the duke, was the reason you ran two regulators because you didnt have access to the pump shot areas of the chip? Or was it because otherwise you would have lost some resolution on the low ve parts of the table? or something else?


[This message has been edited by Pablo (edited November 05, 2000).]