hey guys, need some help, just put dart heads, 215cc 64 cc chambers, they have screw in studs, guideplates, and valve springs to take on est .510 lift. on my 74 block, anyways, threw in a new set of pushrods and an extreme energy cam:

249-CL12-238-2 Cam Kit
Grind: 262
Lift: .462''/.469''
RPM Range: 1300-5600
lobe sep 110

threw in a new double roller chain, already have 24 lb injectiors, the afpr, complete edelbrock high flow intake and headers, full exhaust, etc. currently have a stock 350 prom.

i started her up, she sounded down right mean, but she wont idle. stalls right out. i believe i overdid it, but i'm thinking it might just need a prom upgrade, made sure i got the valve adjustment right, timing is on (from what i can see) when your on the gas, she asks for more, but second i let off under 1000 rpms, she's done and stalls, i got the maf setup in my 87t/a, any help guys?????, i really don't feel like rippin her apart again.

 

Looking at your post it looks like you started out with a 1987 350 TPI engine with iron heads and around 9.3 CR. Now you have added the Dart 215 heads, Comp Cam, Edelbrock TPI intake system and full exhaust. First of all the head is to big for the TPI. The Edelbrock TPI while an improvement will only flow 220 CFM if improved from figures I have seen. You basically need a custom eprom burnt to solve your immediate problem. It's probably to late but you would be much better served with a smaller head such as the AFR 180 or something in that range up to maybe a 195 head at most. I don't have the specs on your cam but it looks to be on the small side going by the lift for a hydraulic roller. Just to many mismatches. As I said at this point in time just get a custom eprom burned. Allen

 

see,car started w/ an 87 305 tpi, since i got the car, i installed a 74 350 block, originally i was running a crane compucam w/ my complete intake setup and a stock 350 chip, it was running nice and smooth b/f the heads and cam, thats why im thiinking that the chip might be the way to go, anything else guys, i'm gonna call up hypertech tommarow to order the chip, i have the pocket programmer and eraser but not the program, should i invest in the bin program or just order the chip?

 

Where’s your base timing? I’d suggest 10 – 12 degrees (running premium fuel) for the stock chip with your mods. Did you reset your minimal idle speed (IAC) then readjust your TPS? There’s no reason the engine shouldn’t idle decently with the stock chip,,, mine does OK anyway. If it’s a little rich and you can’t drop the fuel pressure enough,,, if you haven’t ported the MAF sensor, that’ll lean things up a little. HOWEVER, you’ve got the tools to tune it within the chip without doing it with old fashion trickery. Do a search and check the DIY board. There are a few sites that have the stock bin available to down load. No way would I order an off the shelf aftermarket chip, you would be better off with your stock chip and a little trickery until you can burn your own.

 

thats where i have my base timing, but i didn't think of adjusting the iac/tps, i'll give that a shot, hopefully i could at least get it running, i got the fuel pressure set to wot around 50psi, i'll try and tune that down alittle b/c i'm getting a heavy fuel smell out the back,
is there anyone in the Long island area here in ny that might be able to help show me how to get started on burning my own chip?
anyone else got an opinion?? i wasn't gonna order a reg. off the shelf chip, i was gonna order a custom chip there kinda pricey but i figured if it would get my car running somewhat, i can then work on burning my own. i'm gonna make a shot at it tommarow afternoon after work, see what i can do,
Elias

 

I always reset the IAC & TPS when making top end changes.

Make sure things are clean, and do the IAC & TPS before anything else. The fact that it breaths better shouldn't kill the idle.

I don't think the intake is a bottle neck, I'm using the Scroggin-Dickey Hi-Flo TPI intake, don't know which one is better, but it's not bogging down my stroker. I have GMPP Fast Burn alum vortec heads, 1,5 roller rockers, crane 262 cam, 30#lb-injectors, and SLP 1-3/4" headers.

388 CID
I don't know about your MAF setup, but I bench flowed mine before monkeying with it, and it flowed 512 scfm, so I removed the screens and 2 sets of fins at a time starting with the outer fins first, the first set gave me 675 scfm, plenty for me so I left it at that.

I then moded the Throttle body to 58mm and added the air-foil (actually it was more for looks than functionality)

The 350 57.L I had in my 88' IROCZ had 22#-injectors so 24s would be 10% more, shouldn't be a problem for the ECM to tune out.

I don't set my fuel pressure at WOT, just apply 12volt to ALDL "G" terminal to power the pump with the engine off and set the pressure to 43.5psi per manual, in your case if you haven't change the flow rate in the prom I'd set the regulator at 38# to lower the injectors flow rate to 22.4#/hr.

It works for me - too much pressure at idle and you'll blow gas out the exhaust.

 

sucess guys, i got the motor running, its at around 7-900 rpm in drive, sounds mean as hell, anyways, i'm gonna drive her for a week and then recheck my valve adjustment, i def need a computer chip burned b/c when im on the brake at a light it feels as she wants to kick off. i pop it in neutral sometimes, otherwise its alittle too wet right now to give her a real test, not to mention i want to take it easy for a couple hundred miles b/f i start beatin on her. i'll have to do alittle tuning, def got the timing on this time, and she starts right up lets see how she does tommarow morning in the cold, if anything i might have to let her warm up alittle more b/f goin to work.

IS THERE ANYONE IN THE LONG ISLAND NY AREA THAT MIGHT BE ABLE TO SPEND SOME TIME AND INTRODUCE ME TO BURNING MY OWN CHIPS????

i already read the chip burning article on the website, but i am still kinda questionable on the topic, i guess it's easier if someone can help me step by step.

any suggestions on programs to modify bins?tuner cat?? where to get the stuff??? i have the pocket programmer already.

 

If you already have the burner you might get the manufacturer to let you download the program. You might ask on the boards for a copy depending on which burner you have.

Editing the binary file (lots of freeware, WinBin, TunerPro, GMECMedit..etc) and burning the chip is the easy part, knowing what to change isn't. But, you can do the basic things, change fuel fuel rate to match injectors, change fans on/off control, and base timing before you change any of the tables.

If you can't find freeware let me know I send you what I have, and answer any questions that I can.

 

i have the pocket programmer, what program would be best to use ?