I am going to go to a carb system soon and I have some questions for you guys. See my sig for details to my car. I was thinking of going with a Edelbrock torkerII intake and a Holley 750 double pumper with vaccum seciondarys. How do you guys think this will work on my car. Do I need to go with a smaller carb I will be spinning the mill to 7k so I thought a 750 would be appropiate. Also if any of you guys have a torker intake in a T/A what was the tallest air cleaner you could go with and if you had to go with a drop base air cleaner? I was also wondering if the fuel pickup in the fuel tank was different between the fuel injected and the carbed cars.

Thanks,
Brock

 

PS I know absolutly nothing about carbs so be gentle.

 

Why do you want to swap in a carb? Your setup looks like a pretty mean combo. Sometimes it takes some time to tune the TPI setup and work the bugs out, but in the end it is worth it. What kind of problems are you having with the TPI? I would stick with the TPI myself. Your combo should be able to rev over 6K. Did you upgrade your fuel pump? With the TPIS intake and larger injectors, you probably need a better fuel pump. A stock one might work, but if yours is original, it may be about to die. Lets face it, if original, the pump is 13+ years old. Check your fuel pressure and flow. Disconnect a fuel line, put into a 5 gal. gas can, and see how much fuel it pumps in a minute. Multiply by 60 and that is your gallons/hour. I don't remember what the spec is off the top of my head.

If you are still going to swap anyway, go for it. I think the Torquer will be too tall, unless you have a cowl induction hood. A drop base air cleaner might work, but I would be surprised if you could fit anything bigger than a 2" tall filter under the stock hood. A drop base filter will also restrict your airflow somewhat. As far as fuel pickups go, the TPI has an in-tank elctric pump. By 89, I think all 3rd gens were fuel injected. You could use a pickup from an earlier model with a carb, but I don't know if the tanks were the same. Since you are running nitrous, you could use the existing pump to supply your carb and NO2 system. You would have to use a carb fuel pressure regulator to get pressure down to about 5-7 PSI at the carb. The stock pump, if in good shape would have enough flow for a carb and NO2 system. Check with the tech articles, I think that there is one about swapping out TPI for a carb. That might tell you what you need.

 

No flame intended, but there is no such Holley carb as a Vacuum DP. It is either a DP OR a vacuum secondary!!

I have a 650 DP on my 383 '87 IROC and I just love it!! Runs mid 12s. The Performer RPM and the Weiand Stealth intakes are good to 6500 rpm....... a 750 may be too big for your combo, talk to Holley to be sure, they recommended the 650 for my 383.

I have the stock in-tank FP on my carbed car, regulated down to 7 psi. Works nice.

Good Luck!!

 

If you go to a carb, what are you going to do with the TPI setup.
If you are going to sell it or part it out let me know I may be interested.

 

I have a question too how do u do the wiring for like me to put a switch for the fuel pump. I have a 89 iroc and im doing the carb swap too but am un sure of how do get the fuel pump to work cause im yanking a lot of wiring out. Also what kind of regulator do u guys recommend.

 

I am sorry I ment to say mechanical just for clarification.

The car is going to be a street and mostly strip car only driven on the weekends so I am not worried about the swap from the tuned port. I am going to be selling the TPIS setup after I pull the engine again next week. I have had many problems with the tpi unit including various leaks and it is a pain to work on and not exactly ment for racing 1/4 drags at high rpm. I have exceded the limitations of the maf system and would have to make the change to sd and I have had too many electrical problems. The tpis unit will support 6000 rpm and my cam makes will make it's best power at about 7k way past the tpi posibalitys. I will be switching to a better intake later but my friend gave me a torker II intake for free so I figure why not use it for the time being untill I can get a cowl hood so I can run a victor intake. I have been reccomended to run the 750cfm carb due to the rpms I am going to be turning and the large amount of N2O I plan on running eventually I will probably end up running a 200+ shot in a duel stage kit. The n2o will make up for the responce lost by going with a larger carb. I don't care how it runs off the juce jsut as long as it runs like a bat out of hades on the juce.

 

I just found the following website with dyno results: http://www.cis.udel.edu/~davis/z28/buildup/cam/
With the LT4 hot cam, his peak Hp was around 5500 rpm and dropped off from there. I don't think you will get too much by taking it much over 6K. Maybe 62-6300 RPM, tops. Are you sure you want to go up to 7000 rpm?

I hope that your not using the stock short block. I don't think it will take that kind of RPM. Your sig mentions the top of the motor, but nothing about the short block. With plans for 7K and nitrous, you had better have a forged crank and good rods. A rev limiter would be a good idea. I would also add safety switches for the nitrous to turn off the NO2 if fuel or oil pressure drops too low. Losing fuel pressure at high RPM with nitrous could be disastrous. I would hate to see you blow your engine to pieces. Good luck an dlet us know how things turn out.

Matt

 

I have a 4-bolt corvette block,corvette forged steel crank, Egale forged SIR rods, Speed Pro forged pistons and all is balanced and blueprinted. I am pretty shure it can take it.

I am getting a 100gph electric pump and a fuel preasure regulator with a port for the return line so I don' think I will have any problems with fuel starvation at high rpm. The LT4 hot cam is definately capiable of much more I have seen cars pull much higher with the cam it is all how you set it up I am running my cam 4* retarded to bring the power up in the higher rpms' the cam has a 4* advance built into it so by taking out that advance the cams power band shifts up into the higher rpms.

As for the rev limiter I am gettiing another msd box ( sold the old one I had) to controll the revs and a rpm activated switch to activate the n2o. I am also getting a retard box to lower the ignition advance for n2o runs.

I also plan on porting the torker intake becuz the intalke ports are so small I believe this will also help the car produce more power until I can get a victor intake and a cowl hood.

What do you guys think about the set up in responce to a carb being put on the car or would you sucgest another low profile intake that will flow to the high rpms as I want.

 

I knoticed that he was using the zz4 heads. I am running edelbrock heads that have been profesionally ported to the max I don't have any flow numbers on them but when I take them off I am going to have them flowed to find out were and how much they flow I can tell you that they won't have much volicity in the ports so low end power won't be very good. I am going to rely on high end flow.

 

Sounds like an awesome engine! I would love to see it in action some time. You are right your heads will flow much more than the ZZ4's. I just came across that webpage and thought I would throw it out there. That was before I knew more about your engine. Sounds like you have a good plan. Go for it! Have a good one.

Matt

 

Thanks sparkee

So does anyone have any sucgestions on a intake low enough intake that I can put on that will flow good at 7k?

 

I've never heard anything good about the Torker II. Original Torker, maybe. Better bets: Performer RPM or RPM Air Gap, Victor Jr, Street Dominator.

Bite the bullet and get a cowl induction hood for the extra height you'll have. Make it functional and you're even that much better off.