what are all the modifications i need to do to my 750DP to blow some boost through it. i am not asking for the hell of it, i have the turbos mocked up and waiting to go on, i want to do the proprer things to my carb first, thanks.

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85 TTTA
88 Supra turbo
86 626 turbo
race it or sell it

 

worry about doing the mods to the carb last. The hard part is getting the turbos fitted and functional...after that the carb work is easy.

1. you need nitrophil floats.

2. you need a boost referenced fuel source, so fuel pressure rises with boost.

3. you need a way to pressurize the float bowl. On Holleys thats easy, as a bonnet will also enclose the bowl vent, taking care of that.

4. you need a bonnet.

5. The tricky part, you need a way to pressurize the throttle shafts on all 4 corners with air from the bonnet. That means cutting a channel 360 degree around the inside of the base around each shaft. Then drill a hole from the outside to each channel, and install some sort of fitting to the outside end. Then run a line from each fitting to the bonnet.

The Carb Shop will do all that for ya if you like, and give them your firstborn son.



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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

 

Do everything Jester said..
Don't know how well a 750 works as blow thru but a 650 works very well and 850 sucks. Unless you have it custom built, I have a 950 on my 70 camaro and it works great.

Oh, don't think a 650 in not big enough on a blow thru, cause I run 9.80's with a 650 and 13lbs. How much boost are you going to run? If it is not over 10-11 lbs I would not worry about the throttle shafts. I have not had a problem with that on my 2 cars.

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82z28 (currently building)with p1sc procharger
70.5 camaro
383 with D-3r procharger
best time 9.38@148

 

the turbos are already fitted and waiting, seems i have the list all checked off

1-my holley came with hollow metal floats, i take it you want nitrophil so they wont colapse?
2-fuel system done, areomotive pump and boost referenced AFPR.
3-i can make a bonnet but if someone knows a dual inlet short bonnet, please let me know
4-like i said
5-throttle shafts, hmmmmmmmmm

any other things you can think of? thanks

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85 TTTA
88 Supra turbo
86 626 turbo
race it or sell it

 

1. exactly.

2. sounds good.

3. Well I made my dual short inlet bonnet, but I'm having second thoughts about it and it's ability to make a smooth transition. no one makes one that I know of...just 3" single inlet ones. If you can fit a 2 into one y before the bonnet and one one of those, you'd probably be best off.

5. I have heard of people getting away up to the low-mid teens of boost, without any problems, without doing anything to the shafts. I would think twice about risking it..because if you're wrong it sprays raws fuel right outward onto the headers. but if you wanna risk it..thats your call

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

 

Just curious as I'm currently turbocharing a small Chevy and hope to take it for a test drive this weekend. As a long time Chevy enthosist conveted Buick with the purchase of my Gn. I've developed a understanding of turbochargers. With the recent purchase of an El Camino I decided to attempt to turbo charge a basically stock 350. Anyway back to the question, I understand the concept of increasing fuel pressure with boost as it will blow the floats closed. But in my case I fabricated a bonnet that issolated the fuel bowls to ambient air which I thought would eliminate the need for a boost sensitive reg. and high pressure pump and solid floats. Just wondering why you would want to pressurize the floats only to have to raise the fuel pressure to fight the boost. Please correct me if I'm wrong. Thanks Jon

 

Dude you can't do that. The higher than ambient pressure in the venturi will force fuel back through the boosters and through the jets the wrong way. Thats why you HAVE to pressurize the float bowl.

You have to raise the fuel pressure so it doesn't blow the fuel back through the lines.

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

 

dont forget in addition to the boost referenced regulator to build the fuel system with a pump that can produce more flow and the psi capability must exceed the wanted fuel pressure + the boost pressure together otherwise the boost will push the fuel back at the pump

 

Turbonetics sells one I believe.

 

banks engineering http://www.bankspower.com/ makes a dual snorkel completely housing style airbox (or atleast they used to)

 

Hey guys can you give me some additional help? What type of fuel pump would be sufficent for a 10 psi. application. This is a budget beater and I'm not wanting to buy a high dollar pump if possible. I am considering the Summit 140 it has a pressure preset at 18 psi. with a mallary or nos pressure sens. reg. Thanks for your help. I have the car running with the turbo plumbed in and will post some pics as soon as I get some digital pictures.

 

I was also wondering what size power valve I should use? Thanks