1990 Dual Cat 5.7 TPI Camaro with the following

52MM TB
Vortech Supercharger
Magnaflow cats
Flowmaster catback

About how much at the wheels/motor?

 

Take the $350 for the 52mm TB and buy headers instead.

Port the plenum and base(or aftermakret base) and get a decent set of runners for it.

Get a catback that flows better than a Flowmaster setup does. Not the best choice for performance, even more so when talking on boosted apps.

Chop you stock exhaust setup and reuse the cats for emissions purposes and then swap then out.

I would go ATI vs. Vortech any day of the week, especially if I was going to drive it alot.

And I wouldnt add any boost whatsoever unless u convert to a 749 sy/ty ecm or the 749 code in a 730. Fueling with extra injectors and FMU's is for the birds. Running and tuning something meant for it from the factory net you better driveablitiy, mileage and power.

later
Jeremy

 

I agree with the headers and exahust. but you can use the stock computer. A couple questions for you. Are you buying a kit new? Vortec and ati are both great choices for chargers. Paxtons are not bad but the only kit for our cars is the sn95 head unit and those suck. Also stay away from powerdyne. Another upgrade you might want to look at is a new fuel pump something along the lines of a 255lph. Can you ditch your cats or do you have smog? Well if you can give us as much info as you have I can help answer more questions for you.
Kevin

 

With that setup.. at the wheels... 280 hp 420 tq...

Get headers instead of the throttle body, better exhaust and get some nice runners, 340 hp 460 tq

 

Yes, Emissions is an issue. I'm in NY and they dont like polluters. I looked around for headers and found a pair of Hedmans for the dual cat setup but it says their are only for offroad use meaning not smog legal. If Flowmaster is too restrictive, what a good catback then?

Vortech says their stuff comes with a bigger fuel pump and an ignition amplifier.

I was also thinking adding SLP Runners and an airfoil to the list too. Will the airfoil fit with the bigger throttle body?

I've looked around for intake manifolds but I cant find any with EGR connections which I need.

What gears come on the TPI 5.7 Dual Cat A4 cars?
3.73 with Auburn LSD sound nice. Worth it?

 

You know i havent delt with alot of emissions but it might be cheaper to get a set of headers with a single high flow cat. (not sure if you can do that). The only manifold I know of that has egr is the tpis big mouth manifold. Flomaster isnt a bad cat back. I guess I would go with any 3 inch exhaust you can find. If you really want to step it up go with mufflex 4 inch cat back. I also think when vortech says they have a bigger pump they mean an inline on to use with the fmu. Are you going to use an FMU? The intank pump was the one I was refering to. Slp runners are vary nice peices. And air foils work on almost all tbs. 49 52 59 ect (except mono blade). Gears in that car are probably around a 3.08. In my opinion 373 are to much for a tpi car. When I had 373's with my auto I would run out of steam at the end of the quarter. (5500 rps). And as you know tpi's dont breath so well up there. Thats all I could think of right now.

 

The only catback I found for the dual cat applications was a 2.5 inch flowmaster force 2 catback. Like 239.99 or something from summit. Found Edelbrock headers for the dual cat cars!
The Tpis big mouth manifold is smog legal with egr hookups? So far the mod list is.

3.42 gears with LSD
Vortech SC
52 mm BBK TB
SLP Runners
Magnaflow high flow cats
flowmaster catback
Edelbrock headers

 

Looking good but you need to go bigger then 2.5 inch exhaust in my opinion it would be a waste of money. And yes I know for a fact that the big mouth intake has egr. Cause I have one.

 

The funny thing is, in the summit catalog, it says that kit is a 3 inch catback. but, on the site, it says 2.5 inch. Looks like ill have to give em a call. How were the performance differences with that manifold grover? Was it worth the $400?

 

Well on my 406 It made 430hp and 480 ftlbs of tourque. Thats with the zz9 roller cam and 9.1 compression. I also have the big mouth runners and a ported plentum and a 52 mm tb.

 

this is a good intake for sale.
https://www.thirdgen.org/techbb2/sho...hreadid=312527

 

I think you HAVE to have at least a 3"ID . I would go with the SLP headers myself. Stay away from headman. Just plain crap ....adn it is ment for stock replacement exhaust ( check my www. for pictures on it ).
THe Edlebrock Base is EGR too . I got one . You should get some 24 lb injectors too . I suspect you would get a bit more than 280 rwhp . I got 251 with my mild little setup. Exhaust ...I'd go banks . Best bang for the buck . Or if you don;t mind just pick a single in/out . It's a more efficient design .

 

got a custom chip for a 350 tpi burned for 42# injectors and 6-8psi if youre interested.

chip (formato easy prom) and injectors for sale

 

got a custom chip for a 350 tpi burned for 42# injectors and 6-8psi if youre interested.

chip (formato easy prom) and injectors for sale

Thats a good deal and thats the right way to do it. FMU's are crutches for your fuel system anyways.

 

exactly, all an fmu is, is a rising rate fuel regulator that blocks the return line to your fuel tank, which builds pressure in your fuel system. it gets the job done, but not very efficiently. i also have a walbro 255lph pump to go with that if you want

 

Are you asking me ? If you have the prom file I would be interested in that ( I run the prominator ....don't need chips) . What do you want for it all ... PM me ....

 

you may want to have a look at this intake, a little work & it could look almost factory. & it can run EGR.
for the price, i think its a good deal as it comes with base, runners, plenum , fuel rails & TB.


http://www.firstinjections.com/

 

If I add a 255 gph pump, what injectors should I go with? Can I leave the computer system alone and let it adjust to the air/fuel itself? I mean yeah there will be much more air flowing in from the vortech and manifold/runners and TB and much more flowing out from the headers, cats and catback but extra fuel will be added by the pump and injectors. Is tuning really necassary? Ive decided to go with a 4 inch mufflex catback too.

 

The stock Corvette TPI intake has an egr port near the dizzy for plumbing exhaust gases from the headers.

I use external exhaust gas recirculation on my '88 TPI using vortec heads, a Scroggins-Dickey High-Flow Vortec TPI baseplate (intake,) and SLP 1-3/4" headers, I bought the external EGR kit with the headers.
I modified the stock TB unit by installing the airfoil first then boring it out to 52mm.

 

Well I think ill go with the TPIS bigmouth for a manifold.

 

yes you will need the tuning, if you dont have your fuel curve adjusted to dump more fuel as boost increases you'll have a dangerous lean condition..the fuel curve that your computer knows now doesnt supply enough fuel for boost unless you use an FMU, and without computer tuning you'll ping like crazy if you dont use alchy injection. what you need is a tuning that incorporates more fuel and a gradual timing retard as boost increases so you dont need to use a patch such as an FMU or alcohol/water injection.

 

How much boost you going to run cause that will determin injector size. The reason I ask is cause you dont always want the biggest injectors. Bigger injectors are harder to lean out at idle. Most manufactures run injectors at 80 %. Just so the can tune them down for cruising or idle. If your going with like the 6- 8 pound pully your might be able to get 36 lbs injectors to work.

 

36lbs are good, but if you ever wanna grow from the 6-8 your 36's will be pushing the limits..i dunno, theres a lot of opinions out there on them

 

Well I guess basicly v-8 slayer you have to let us know what kind of power your looking to get and we can go from there.

 

The kit is a 6 lb boost setup.

 

Despite all I have been saying maybe you should stick with an fmu. Just for this reason. That kit is a proven kit. Yeah I am not a big fan of fmu's but in this case it might be the most logical thing to do. If you were running over 6 lbs I would say get injectors and tunning. Not that you cant do that. Your car with the kit would work like a factory supercharged vehicle.

 

Yeah, thats what I was thinking. If I did a cam and heads I would think tuning would then be necassary but all I am really doing is a supercharger and then bolt ons...The vortech FMU should be fine for my case.