Chevy & GMC Vans

update;
Feb 4th is part ordering day. I calculated the whole tax return payment credit card 30 day grace matrix and came up with Feb. 4th!

I'm going with the dual TBI and I'm going to make it work! Brian with http://www.tbichips.com/and Robert from http://www.dynamicefi.com/ and I are going to put the PCM/ECM together.

Unless someone can find a better one, I will be getting a dual Edelbrock intanke http://store.summitracing.com/partdetai ... toview=sku

Air gap intakes for TBI's are not recommended.

I want to use Dynamicefi's EBL system but I don't want to deal with buying and setting an addition computer for my 4l60e and I don't want a 700r.

If I stand really still in the garage, I can almost here the motor running.
j

I will be watching this thread closely Jim.Please post pics and info as you go threw the build.Very cool.

Worked on both TBI's this weekend. I CNC'ed the TB and the fuel injector pods. I will post a picture of how shiny they are.

there are only two choices for dual vortec intakes and both are made by Edelbrock. One is just a low profile jobber

or

the other one is a air gap style which has some performance designs. The problem is I have read and heard air gaps and TBI's don't play nice together in cold weather. The warmth of the manifold help evaporate the gas. Air gap separates the intake (air) from the heat of the lifter valley. I would like the air gap manifold but don't want any drivability issues when it's cold. What to do?

I would have to cut the four barrel center out to the first one to make the Holley TBI adapter fit right. Should I just go with the performance one?

I have decided to go with the cop car injectors and they seem to be in short supply. Anyone know where I can get a set of four? I have contacted the injector place http://www.fuelinjector.citymaker.com/p ... 548117.htm and he id keepipng an ey out for me.
GM 5235206 *RPD
Yellow/Brown
5.7L Cop Car
65 lb/hr
If used, I will send them to the guy above to have them clean and flow matched. I think these manifolds above aren't single plane so getting the injectors matched will be important.

Oh, I forgot to say that I converted the to fuel regulators to AFR's. Very, very easy... Not sure why they even sell AFR's for the 220 tbi's?

I would go with the #5425 with the centers machined out. The #7525 advantage will only show up on a drag strip, not in daily driving and there is the driveability issue you mentioned. The low rise also gives more room for whatever is the biggest air filter you can fit. Many otherwise solid engine combos lose out on simply not being able to draw enough air in despite all the trick engine breathing mods. I forgot, are you louvering the hood or some other method of letting under hood heat out?

Jim-what did you workout about the oil pan??.

Yes-my plan is to have a functional hood scoop that can be redirected in bad weather. This will happen after the engine and transmission are in and functional and about the same time I really start the body work.

Brian (TBICHIPS) is recommending the air gap as he has experience with his Blackmagic truck. Still torn...
Also he is recommending that I run the TBI's in series to prevent an unbalanced fuel mixture.

Oil Pan, Now that the dual TBI's are in and we are conservatively looking at 500 HP, I will do the pan mod's. Not a big deal, just more time. I'm still having fun...

Jim-wouldn't the temp sensor and computer handle rich en up the TBI's in the case of the air gap for cold temps??.Using the air gap manifold is increasing the density of the fuel/air charge.I vote for the air gap manifold.I think Brian has got it right.These manifolds are a long,long ways away from trying to run a tunnel ram on the street where those concerns you have would play a role on them.

Yes- Brian said that he could do some creative programming to help with any cold weather issues (that is if we experience any issues).

I really shouldn't have any clearance issues as I have 4" lift tubs welded to the sub frame and another 2" body blocks if I need the room. I like the looks of the air gap and who knows, maybe I will take her to the track? If the Air gap does not work out, i can always sell it. I would have a had time selling a modified intake (the lower profile one) if I cut it up.

j

I do like the power band of this intake.Just a reminder that AFR made on it's web page about valve float with the stock lifters and stock lifter spider.Got to limit to 5,500 RPM unless you do that mod to their product.What is the RPM range of the cam you are using??.Surely you want to match everything up. Good luck on your build.


BTW-any port matching you need to do given the heads and intake??. :-k

Basic Operating RPM Range: 1,800-5,800 on the roller cam.

I purchased the GMPP kit http://store.summitracing.com/partdetai ... toview=sku and iplanned to limit the rpm to 5500 or so.

Yes I will do some port matching on the intake all though i don't think there will be that much to do. Remember those heads are 200's so I won't intrease the port size. http://store.summitracing.com/partdetai ... toview=sku

Who knows, the intake may lineup good?

Once you get over 2 inches from the valve, whatever famous porting tricks you try won't make as much difference as one might expect. Humor yourself but don't increase the dia much is my advice.

HPbyStan wrote:Once you get over 2 inches from the valve, whatever famous porting tricks you try won't make as much difference as one might expect. Humor yourself but don't increase the dia much is my advice.

Stan-that is simply not true.Here is a part of the puzzle.Smooth transitions from the intake to heads is a mod in use by many for yrs.It is a mod in use in tunnel rams that I personally can attest to having one that wasn't port matched and one that was.Surely tunnel rams are farther away than 2".

http://www.csgnetwork.com/csgdynamichead.html

OK, I won't post any more so Gary doesn't have to correct me.

HPbyStan wrote:OK, I won't post any more so Gary doesn't have to correct me.

Stan-no offense meant.Sorry guy.

PM sent.


Jim-a reminder about removing the guide plates and the self aligning rockers needed with hydro roller lifters.