i have made some major changes to my engine and having major learning curve to the noodle to figure this out if you increase your injectors from 24 to 40 what is the recommended fuel pressure to use ? i do know the stock pressuer is only about 26 so should i be bumping mine up to 40 ??this is one of many questions the air pump system that pumps air into the exhaust etc I removed mine completely what needs to be done to live with that ?

 

The stock pressure is typically 43.5 psi (3 BAR), new bigger injectors, that is still the standard rating psi and is where you typically will start.

Adjusting the fuel pressure from stock is a the typical bandaid solution for when you don't have a way to re-tune the ECU or if you just need it a little leaner or richer in a hurry at the track. If you have a the capability to tune your ECU properly that is always preferable to adjusting fuel pressure. The trouble with adjusting the fp to compensate for a lean or rich condition at WOT is that you then rely on the ECU to compensate for the changed fp in the rest of your normal driving range.

If you have an easily tunable ECU, you typically only change fp if say you need a little more flow. You may then bump FP up to essentially raise the rating of your injectors.

 

What have you done to the engine to justify such a big increase in injector size?
You don't state what intake you are running but there are few TPI setups that could use that big a injector
Most run 32lb injectors in 383's
If your injectors are too big for your combo and you lower the fuel pressure to try and reduce the fuel flow then you run into the problem
of there not being enough pressure to make the injectors spray correctly

Nothing
There is no feedback on your year to tell the ECM if it is operational or not

 

The air from the A.I.R. system affects the O2 sensor output so the ECM compensates for that. The change is pretty subtle so I think you're OK without modifying the tune.

 

Cool I am buying a ECM pocket programer and eraser any one know what is the best easiest to understand software and what should i pay for said software ?

 

Well the engine is a 434 Cui all aftermarket engine forged crank internal balance icon forged pistons AFR heads 200 cfm flow and a mild cam for the mill I did this so the Fuel injection could run smooth still the numbers are 214 224 at 50 and 444 466 lift with 112 separation so the tpi should have no issues the TPI itself is a factory intake that has been pro ported the tubes are the largest i could find a full 1/3 better flow the top plenum was also pro ported cut to match the runners that with a 58 mil throttle body . Now i do have a new set of 36 mm injectors i thought those might be a bit small though . the trans is a full out Raptor good for 600 hp with a 2500 stall i want fast but i want to drive it to church on sunday too LOL

 

42 lb injectors may be more than you need. You have displacement, but by the sounds of your combo you are looking to be done making power by 5000 RPM.

You should be able to tune with them though.

 

There is a tiny problem here: the 68HC11 processor used in these ECMs is relatively ancient and most of the tools have disappeared over the years. For example, Motorola's tools are all gone and their web site supporting the 68HC11 no longer exists. Fortunately I have the "pink" book. I used it on a job I had back in the late 1990s. An interesting little company called Extron Electronics...

I have used this one:

http://www.hc11.demon.nl/thrsim11/thrsim11.htm

I had to pay for it a few years ago, but I see that he has now released it as a free version.

 

I just bought about 650 worth of goodies to help with programming this old chip and came to a realization . The engine we built would make 500hp all day long with a good 4 barrel and a nice set of headers but with the vette headers and the moded TPI I will be lucky to make 400 hp 36 lb injectors will be plenty and I now need to learn how to tune this I did get the in dash Ox sensor gauge setup to help as well so any help will be very apreatiated thanks

 

Nobody uses that last century technology for reprogramming stock memcals ( chips ) anymore
Either get a reprogrammable EPROM and a adapter card to fit it in the ECM in place of the stock memcal
http://www.moates.net/gp1-package-gm....html?cPath=31

and a burner to program the chip ( unlimited )
http://www.moates.net/burn2-chip-pro....html?cPath=94

Remove EPROM , reprogram , reinstall , drive. No waiting 15 min each time to erase the stock memcal

or a emulator that replaces the stock memcal altogether and allows real time changes / adjustments / tuning from a laptop while you drive
http://www.moates.net/ostrich-20-the....html?cPath=95

Never have to open up or touch the ECM again

 

If I was giving that much HP away ,I would be investing in a better EFI intake before wasting $$$ on tuning
100 Hp difference here between TPI and a better flowing intake ( on a 383 )

http://xtremecarzone.com.au/index.php?showtopic=386

 

Should be no problem. You have a 165 ecm. I'd download a 6e xdf and the ARAP bin and tweak it with Tunerpro RT. It will let you tune and datalog. Just a bit of reading involved to get started.

 

The engine is a monster it is an all forged internally balanced 434 cui splayed cap 4340 I beam rods Icon 21cc dished pistons the rotating assembly and heads are good to 800 HP but because i wanted to stay with a basic TPI i have a dog of a cam and a stock looking TPI it is all aftermarket the Manifold is OEM but has been pro ported the tubes are large Siamese tubes the top is cut to match the tubes and a 58 mil throttle body and 36 lb injectors the headers and exhaust are a set of Corvette shortie headers with duel fm40 Flow masters the trans is a Raptor 700r4 good to 600 hp with a mild 2200 stall fairly stock ish converter I want a fun car i will after i get the tuning down to an art add something maybe a turbo my compression is still under 10 we figured about the 9.5 to 1 . so if not a turbo then a good 100 shot of nitrous . the diff i am having a 36 machined to accept a 12 bolt ring and pin. So the guesstimated horse power is going to be about 400 but the torque should be fun i would guess over 500 maybe 550 at about 2500 rpm so it will still be fun . I may upgrade the fuel injector and put a larger set of headers a large roller cam in it some day it is nice to know that there is an easy 200 more horse without having to touch the engine really . Future upgrades , today it is learn the language of old TPI

 

I have this comeing from Moats
1 x 'BURN2 Chip Programmer'
1 x 'Ostrich 2.0 : The New Breed'
1 x G1 Memory Adapter: TPI ETC..
1 x Innovate MTX Series Digital Air/Fuel Ratio Gauge Kit P/N: 3844
2 x C2 SST 27SF512 Chip
1 x 'ALDU1 and CABL1'
I am hopeing this is all i need and i have no clue about software i know some of these toys come with software but i may want to get more user friendly . I have been twisting wrenches since i was 12 when i found my first 58 pontiac in the bush with a burnt exhaust valve fixed it and drove it home lol to my parents horror . since then i have never paid for someone else to fix my Rides . I have had some real dream rides i owned an 84 vette bought it new in 87 it had 2000 miles on it . Sold it when it had almost 30 and regretted it . I have had a ton of fire birds a few Camaros and still missed my c4 . when i get this one all perfect i want to find a good 99 C5 i want to pull the 5.7 and do a 383 stroker kit on it with a roots style blower on it i saw one lately just a 350 with a magnasun blower walked all over the new 6.2 Camaro nice car . well if anyone knows any other good reading material on the pieces i bought help me to figure them out faster i will thank you now ,

 

You have the tools you need. Once you do some reading and know how to use them you will be fine. If you download a 6E XDF file and the ARAP bin and open them in Tunerpro RT, you will get a good idea what you are dealing with. You dont have to wait for Moates to send you the CD. You can download Tunerpro from the Tunerpro web site.

 

I am just guessing as to what this setup will make i am trying to be realistic i dont want to be disappointed this way if it makes 450 at the wheels i will be ecstatic . you have a 383 are you running the TPI setup or did you go with something else ?? and what are you able to make for power and torque . I have built a number of 383s but i built a 406 a few years back took a 400 small block bought a nice set of rods and pistons had it balanced and what not bought a set of E street heads a nice hyd cam and a 750 Carter AFB a set of 2.1/2 headers eldabrock intake and stuffed it into my old 70 1/2 Z28 i was blown away the difference in torque i could turn both tires at 50 mph without trying hard ,

 

The Files you suggested they seem to be for 89 and up i have an 05 87 build although some of the wireing etc seems to be a possable 88 build ? how do i know for sure what i need for a file find the mem cal and read the number ??

 

My friend and I are trying to tune an 88 Chevy Corvette with tunerpro rt. I see that the $6e.xdf file was suggested for this post but I see in the definition file this.

$32B 1227165 32B.xdf 1227165_160.ads 87-88 5.0/5.7 F & Y Body

Does anyone know which one should be used for an 88 Chevy Corvette?

 

A 1988 came with 32B but you can use 6e if you want. Either one will work, just make sure you use the correct adx file for scanning.

 

Awesome thank you. We tried to use a tuner shop that said they could tune the car with a chip but after sending the chip to them 5 times and paying for them to try to get it right we gave up on them and hoping we can do it. We order everything from Moates they said we needed, and we have looked over 3 tutorial on how to get started. Still not 100% sure what all files we need for tunerpro rt to work but I will be messing with it this Sunday all day looking up stuff etc. The modification to the engine makes the default chip not run the car right. So we are hope like hell we can figure this out, spent so much money on this project.