91formulaSS

got a relatively good deal on a ZZ4. going infront of a T5 and I need a carb recommendation. was thinking Holley 650-750DP. but don't want to overcarb as this will be mostly street driven. GM recommends 750VS, I went on Holley's web site and they also recommends a VS carb? 650 I think?

Also was wondering about linkage and choke? car is originally a L03. I read the FI to carb tech article and it mentioned I'd need to fab something up for linkage. Any help would be greatly apreciated.

Thanks
nick

Apeiron

A 650DP with an electric choke would be fine. With an electric choke the only linkage you need to worry about is the throttle, which is no problem.

91formulaSS

Thanks Apeiron.

yeah, I was asking about throttle linkage. sorry if I worded that weird. so your saying my TBI linkage will work?

Apeiron

I don't know if your TBI cable and bracket will work, but at worst you just need to replace the throttle cable and buy a new bracket. You don't have an automatic so there's no TV cable geometry or anything to worry about.

91formulaSS

so this is what I'm looking at:

carb: http://www.holley.com/0-4777C.asp

choke kit: http://www.holley.com/45-224.asp

Figure I’ll need the installation kit: http://www.holley.com/20-124.asp

and dual feed line: http://www.holley.com/34-150.asp

what about the throttle cable bracket?: http://www.holley.com/20-88.asp

and what about tuning - I assume it will be alright out of the box. can I tune it at a later date? suposed to come with a tuning DVD but will I also need to purchase a tuning kit?

please bear with me - this will be my first carburator. Thanks for all the help.

nick

Apeiron

It'll run out of the box, but you'll need tuning to get the most out of it.

91formulaSS

I just read the ZZ4 installation manual, and confirmed GM recommends a 750 vacuum or mechanical secondary carb. If I go with a 650 will I be holding the motor back much? I assume I'll have better street manners with a 650, but wouldn't a properly tuned 750 also be good? basically what are the pros and cons of each. Thanks for the help.

DTL504

iTrader: (1)

Pro-System Carb-----Knuff Said

http://www.prosystemsracing.com/index1.html

91formulaSS

for a street car - daily driver? They do look nice, and they do have "crate motor" carbs, but the cheapest is around $600 for a 4150. Thanks for the recommendation, but I think I'm going with a standard Holley. What about a 700DP as a compramize?? any thoughts??

five7kid

iTrader: (14)

GM makes their recommendations to protect the general public from the "bigger is better" mind-set.

A 650 is "big enough" to produce the peak torque, but a 750 will probably produce high peak power. With a T5, a double pumper is critical. VS will not close immediately when the throttle is closed, which will cause havoc with a T5 when trying to shift as quickly as possible. If you never do that, a VS would be fine.

For the DP choices, 650 would give you the best street manners (600 even better), 750 the highest peak HP. 700 would be a compromise between the two.

91formulaSS

so GM used a 750 to get the highest rated HP/TQ numbers, and that is also what they recommend. But I'd probabbly be better off on the street with something smaller? I think I'll go with the 650DP since this will be primarily street driven. will I be able to use the throttle cable bracket I linked above with my TBI linkage? Thanks for the help.

five7kid

iTrader: (14)

GM used a 750 DP to get the highest HP #, 650 DP to get the highest torque #, and recommend a 750 VS. That should tell you something.

I don't know that you "need" that throttle cable bracket. I've heard several people say they used their stock TBI stuff.

You will need a throttle valve corrector bracket on the carb throttle arm, such as SUM-700202 from Summit.

I don't believe the studs in the installation kit will work, either.

91formulaSS

Thanks 5-7 & Apeiron

you mean to mount the carb, or for the throttle bracketry? If I can't use the studs in the installation kit - what do I use? I assume I need some of the parts in the kit, i.e. gaskets, air cleaner stud, throttle cable ball. I want to make sure I get everything I need for the install before I actually start. Thanks again for all the help.

nick

five7kid

iTrader: (14)

Sorry, I meant the throttle cable studs.

The corrector bracket will have the TV cable mount. I'm not completely sure what the TBI throttle cable looks like.

91formulaSS

sorry for the confusion - this carb stuff is all new to me. Do I need one of those in-line fuel filters by the carb? or is the stock one by the gas tank enough?

Badass355ciz28

iTrader: (17)

the one at the gas tank(inline > should be good but it wouldnt hurt to run another one

91formulaSS

Thanks Badass355. I think I'll stick with just the factory filter for now. I actually just got off the phone with summit and ordered everything. Motor came in today too. can't wait.

I was wondering about the throttle valve corrector bracket (SUM-700202) that 5-7 mentioned. I ordred it, but the tech said that it's only for cars with 700R4's? and that I shouldn't need it. I also got an assortment of throttle studs so hopefully one of them works.

Badass355ciz28

iTrader: (17)

if its for the 700r4 u shouldnt need it.....how much did that run ya?