I am wanting to get a more rpm friendly intake setup on my car. It is a 92 TPI. I have no problem with the tpi except that it doesn't like to run above 5000 rpm. I have not siamesed the lower intake, but i have siamesed runners and ported the upper to match the runners and 58 mm TB.

I have an old victor JR in my shop and was thinking about modifiying it to work with the stock ecm. Does anyone have any experience with this swap? Aside from the IAC I don't see how anything else will be a problem.

If anyone knows I would need some places to look for throttle bodies. NOS makes one but I haven't looked into the swap that deeply yet. Right now it is kind of a thought, but I am interested in what you guys think.

Thanks in advance.

 

holley makes a high raiser single plane intake and they sell it with injector bungs and everything done already. you can get it with everything includeing inejctors. just imatate the stock wiring and your set. i belive it comes equiped as so


1000cfm 4bbl TB
high rise singel plane intake
2 fuel rails
FPR
and gaskets

this would be about as extreme as i would go.check out the holley site they should have something.

 

http://soflaspeed.freeservers.com/efi.html

Not pretty but cheap if you have an old carb laying around. The IAC is from a 2.8 Beretta/Corsica/you name it car from 88-91? The TPS is from a TBI something or another or a Cadi 4.9L PFI that uses a TBI style TB.

 

Thanks for the info

Hectorsn
That link showed some pretty neat stuff, thanks for putting that in. I would like to modify the Victor JR intake I have, but I may just buy a TB because I don't have any of the parts listed. However all those cars are plentiful in junkyards!!

 

well if id have known that ws a direction you wanted to go in. got a 600cfm vacum secondary holley laying around ??? knock the venturis out and port the venturi area out. flows about 750cfm after its all done. the last one i did i smoothered in jb weld ported polised took off the float bowls etc etc etc . loked pretty good powdercoated.injetcor bungs can be purchased form holley as well i think. blank fuel rail is fiarly cheap to get to.

 

I had the intake conversion done on a victor jr. but had to re-do the lines, regulator placement, etc.

My intake did not have any provision for manifold vacuum. I drilled a couple holes in the back of a 1" spacer. I found a NPT tap big enough at the local plumbing store and volia... vacuum ports.

I used 3/8" stainless steel lines to move the fuel around. Not sure if you are trying to save money or not but if you are, there are some newer lines out there that are just as good as stainless but cheaper. I found assembling the lines pretty fun... I wraped the ends in tape used a chop saw to cut them. Here is a picture z28boy took of an adapter fitting to take you from the stock fuel lines to -6AN.
He has the part numbers here: http://z28boy.cz28.com/mods-fuellines.htm

I had a holley 4di 4bbl 700cfm TBI unit laying around and I used it for my air meter and sold the injector pod off it on e-bay. The holley TBI units are pretty cheap compared to the other aftermarket throttle bodies out there. If I didnt have the TB unit I would have bought the 900 cfm one instead. I think you can buy the TBI units from holley w/o the injector pods for less than $300. I paid just over $400 for mine new with the injectors. To convert it you only need to drill / tap a hole in the top for the air cleaner stud and plug the fuel line holes. If you go this route, make sure you get the 4di TB not the 4d one. Their 4d setup does not use an IAC.

If I were to do this again, I would not have payed for someone to do the intake machining for me. If you have access to a drill press, make yourself a jig and do it yourself. Its cheaper and you wont have to wait 3 months to get your intake back. You can buy the fuel rails and bungs from holley:
http://www.holley.com/HiOctn/ProdLin.../C950MPIA.html

Oh, while you are in there... think about the valve float you will have above 6000 rpm. That intake is good for 7k+. AFR sells a rev kit but if I had it to do over I would have gone with a solid roller cam. If you have roller lifters you wont have problems adjusting the valves all the time.

Heres a picture of mine:
http://www.fbody.com/members/workman/MultiPoint2.JPG
you might have to copy and paste it in the address bar to make it work.

Cheers,
-Dan

 

AWESOME

I do wonder though does the IAC and TPS on the holley TB work with the stock wiring. I have a 92 camaro TPI. I have no problem modifying the wiring but I want to have as much info on the conversion before I get started. I have worked with the braided stainless lines and I tell people to do exactly what you suggested.
Also I have access to a full machine shop and I am an experienced welder so the modifying of the manifold will not be a problem.

What FPR are you running?

THanks for the information and advice, keep it coming.

 

I cant speak for the TPI controller but I think it will work. I've run that IAC on a TBI setup by simply wiring in the correct plug to the TBI harness. I just looked at the wiring diagram in the back of my hanes manual to get it right. I switched to Gen 7 DFI when I went multi-point.

Its an aeromotive regulator... a bit of overkill for now until I get my turbo setup done.
http://www.fbody.com/members/workman/MultiPoint3.JPG

If you have full access to the machine shop, you could actually make your own bungs and rails.

 

Cool!!

I would like to keep my stock ecm because of money issues. I have been burning proms for a short while and feel comfortable to re tune with the new induction. I will keep my stock fuel rails if I can, don't see why they won't fit.

Thanks for the help.

 

Wow I finnaly get the b@lls to try the homemade mpi setup and a ton of people start getting interested. Keep the info comin. I remember a while back some guy with a malibu made this swap useing a tbi throtle body on a single plane intake with a 90-92 tpi cpu. I can't find the post but he had it all figured out and runnin. A question for the guys who converted a single plane, how did you drill the intake? Did you get some bungs to weld on or just drill the required hole in the intake and line it up with the fuel rails? I have most of the other stuff figured out unless there is some funky stuff that goes with the 90-92 cpu. I'm converting from a carb but my car has a speed sensor so i think i'll be ok there once the wiring is figured out.

 

I haven't started the swap yet, but I do have access to a full machine shop. I will just set the manifold up and drill the holes with a mill. I am going to use injector bungs. Other than that I don't know what I will be doing. I will probably change over to a much more aggressive solid roller camshaft when doing this swap because I will have the manifold off anyways.

 

Make sure all the holes are in line and drilled exactly parallel. Make some kind of jig if you have to. Make sure the holes are the same distance apart as the holes in the fuel rails.

Ensure you have clearance for the TB unit / throttle linkage, Throttle bracket, TPS sensor, etc.