TPI to carb.

[bluegrassz]

How many of you guys has changed from TPI to carb.

I am planning on doing the swap. I am building a 1/8 mile street/strip car. I will be going to a 383 stroker with dart heads and a holley 750.

I was wanting to find out if you liked the carb over the TPI.

Keep in mind, Im not worried about how much gas it uses. Its not my daily driver.

thanks.

[Iroc-Z89]

I just finished mine conversion not to long ago. I went from a superam and dfi computer to a victor jr. single plane with a 750 double pumper. I loved the turn out. The underhood appearance is alot cleaner and neater, you don't have sensors going bad all the time, you make all your adjustments with a flathead screwdriver, and there is alot more room. Not only that the car went from 12.3 to 11.7 on the motor. Its not hard, but you do have to change the fuel pump which is a pain. But in the end it was all worth it.

[bluegrassz]

Just a few questions.

1. Did you remove the old fuel pump, or just put in a inline electric one and did you use a regulator.

2. Does you setup clear your hood, or do you have a cowl hood?

3. What did you do with your vac canister. Did you remove it or leave it in?


That was a good E.T. pick up. What do you have done to you motor?

sorry one more question. Did you fix up a switch for the torque converter lockup?

[Iroc-Z89]

Lets see.

B&M make a switch for the trans, but you can make your own.
It will clear your hood without an aircleaner, but thats with a victor jr. intake. You will have a little more room with a dual plane.
I now have a cowl because of my nos plate and aircleaner.
I removed the old fuel pump out of the tank and put a holley blue pump mounted in line but still outside of the tank.
Evac canister, ecm and wiring harness, gas lines, everything emissions or fuel injection wise is gone.

[bluegrassz]

sounds good. Do you have to take the intank fuel pump out or is it just better to?

I will proably go with a Team G intake, so that means a new hood. :D

How much hp are you running now? not including the N20.

[Iroc-Z89]

Don't have any numbers on it yet but when i do I will let you know. Yes u have to take the intank pump completely out
But I used the bracket and everything thats holds it. I just took the pump itself out

[MrDude_1]

you can leave the pump there and just use a fuel regulator to drop the PSI to carb levels.

if you swap to a vacume advance HEI, you will be able to take the computer out completly...


unless it has a eletric speedo... then you would need the computer for that... :shrug:


the tranny lockup can be taken care of with meny of the kits out there.

[SDTADave]

The computer does not control the speedo. I took the computer out of SuperPhils GTA and the speedo still works. The intank pump will work fine, if you get a Fuel Pressure Regulator as MrDude said. Drop the pressure to about 5-9 Psi. We also did nothing for the Tranny, no switch or anything and it still shifted perfectly, but then again it was a built 700R4 trans w/ all the goodies. If you go with an aftermarket shifter it should tell you the Part# for the switch you may need, Phil's had a Radio Shack Part# include with his, but we did not use it.

Dave

[Iroc-Z89]

sorry I hit new thread instead of post reply.. :conf:

[SDTADave]

If he got a FPR with 2 or 3 ports then he could recirculate it back to the tank. The pump would not wear out any faster than normal.
(Other post)

[Iroc-Z89]

Yah I guess u could do that, but if u plan on spraying the car your gonna have to upgrade the pump anyway and the holley blue and black pump are the best for that setup. So I went ahead and switched the pumps for that.

[MrDude_1]

Originally posted by Iroc-Z89
Yah I guess u could do that, but if u plan on spraying the car your gonna have to upgrade the pump anyway and the holley blue and black pump are the best for that setup. So I went ahead and switched the pumps for that.

as far as i could tell, hes not..

therefore the required volume of fuel isnt going to change...

so theres no prob. :raz:

[Iroc-Z89]

But see most people think ahead, and therefore if in the future if he is gonna spray (which he didn't state) it would be better to change pumps. Stock pumps are peices of shit anyway. And how many of these cars have u built yourself? And I guess your telling me that a stock pump flows the same as a holley blue or black pump. If your gonna convert you may as well do it right the first time so you don't have to backtrack anything, trust me I have went through all of this several times. ;)

[Newsance]

Not to mention that most carb FPR's will let the pressure creep up when subjected to 45+psi input pressure, and suddenly the carb is spraying gas out the top when the floats are blown open...

[Iroc-Z89]

And if there will be no spray, then I would recomend setting the psi to about 6 or 7 the motor will be happier with that.

[bluegrassz]

Naw, Im not planning on spraying. Sorry I have been on vacation. I can pull the pump, but I hate doing it, its a pain. :(

I never thought about using a 3-port regulator and route the excess fuel back to the tank. Good Idea. Then even if I do change my mind and spray, I will have the regulator.

[MrDude_1]

Originally posted by Iroc-Z89
But see most people think ahead, and therefore if in the future if he is gonna spray (which he didn't state) it would be better to change pumps. Stock pumps are peices of shit anyway. And how many of these cars have u built yourself? And I guess your telling me that a stock pump flows the same as a holley blue or black pump. If your gonna convert you may as well do it right the first time so you don't have to backtrack anything, trust me I have went through all of this several times. ;)


1 he never said anything about spraying.

2 its a PITA job thats not needed.

3 did you know that the stock "POS" will not only flow enough for a mild street motor, but it will last longer then the holley pumps too? :finger:

4 newsance: bullshit. :bsflag: :finger:

[Iroc-Z89]

So a 383 with dart heads is a mild street motor?? And I guess your John Force to huh?? To people that don't have all the money in the world, a 383 with dart heads would be a pretty radical motor. I know mine is- but I forgot your talking to the idiot that knows nothing about these type of cars. :finger:

[Iroc-Z89]

And I'm not even gonna bother telling anyone how my car runs, you do your car the way u want, and I will do mine. When u wanna race let me know. Theres no place to far. And I don't race for free. :finger:





Oh and Newsance, I have found a better rear-end setup that I just switched too. Its a pretty neat little setup. If u wanna know more about it I will let u know. ;)

[MrDude_1]

okie.

i'll be at darlington this friday. :wavey:


see ya there. :raz:

[Iroc-Z89]

Like I said, it takes money to get my car off of the trailor and u better have alot of it!! :finger:

[MrDude_1]

Originally posted by Iroc-Z89
Like I said, it takes money to get my car off of the trailor and u better have alot of it!! :finger:


trailer? oh im sorry.. i didnt know you had a trailer queen..... i wouldnt want you doing all that polishing again for nothing...

:raz:

[Iroc-Z89]

Queen definately not..........King maybe!! :finger:
I wouldn't waste my time or gas on u anyway

[MrDude_1]

Originally posted by Iroc-Z89
Queen definately not..........King maybe!! :finger:
I wouldn't waste my time or gas on u anyway



yea yea yea... backing out.... :raz:

[redvette]

You can run the stock fuel pump and have no problems. Every pump has the potential of going bad, however a Holly blue is way more likely to go bad than a stock one. How many Holly blue pumps do you see go 100,000 plus miles, not many if any. I'm not talking out my ass either since my Vette is using the stock intank pump and I switched to a carb years ago. My car runs consitent mid 10's on motor so it's not a wimpy motor either.
Save yourself the hassle of pulling that damn pump out, regulate it down and use the factory return line.


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[bluegrassz]

hey redvette. Nice car.

That is what I want to do, I hate pulling the gas tank, and It does have a new pump in it, maybe 5000 miles on it. The regulator would be a lot easier.

What mods have you done to you engine?

[redvette]

Thanks Bluegrass.
The motor in my car is an 11.1 406 with Brodix Track 1 heads. They've been worked and flow 320 intake and 220 exhaust. I'm using a Crower solid roller cam with .656 lift and 272 durration @.50. It's ground ona 105 and is installed at 103. The intake is a Bowtie and the carb I have on it now is an 850. the motor really liked the Dominator however for street driving it was a little much. Since the photos were taken I installed a set of 1 7/8 Hooker Super Comp headers. I'm running a turbo 350 trans and a 9 inch converter. I went back to the 17 inch sawblades wheels (stock 92 Corvette wheel) and no longer run the Weld Wheels with the ET streets. I'm now using the Drag Radials from BF Goodrich. Funny thing is I got my best 60 ft time of a 1.50 with the drag radials. I guesss independant rear suspension isn't all that bad for drag racing after all.
Good luck on your Z :thumbup:

[Iroc-Z89]

Well maybe you had better luck with yours. I installed the pump that accel makes out of jegs and I did what u said. The pump only lasted 3 months, and that was no nitrous. I never said u couldn't do that, I just had bad luck with that setup.

And Good luck with your car. You will definately like the carb better.

[bluegrassz]

I have a friend running a 388 in a 72 nova, his times are 6.48 in a 1/8. He is getting a 1.30 60 ft times. he is going to help me build my motor. Hopefully we will get a good setup with heads, cam and intake.

I am going to tear the TPI down during the off season. But I will still run it this fall. I will post some times with it as soon as I can.

thanks.
bluegrassz

[Iroc-Z89]

I ran my stock tpi, although it was ported alot, on my same shortblock and ran a best of 7.36 on all motor in the 1/8.

[bluegrassz]

Originally posted by Iroc-Z89
I ran my stock tpi, although it was ported alot, on my same shortblock and ran a best of 7.36 on all motor in the 1/8.

Thats some good times. What was your trap speed?

[Iroc-Z89]

If I remember right it was around 90-92 mph depending on how well I hooked. The only I had different was a solid roller cam. Now I am running just solid.