This is what I had,(305 TPI),this is what I got(350 TPI)W/ AFPR set at 48 PSI,26 PSI injectors,Hypertech thermomaster chip and 160 stat.Now that I am driving it I do not have any more power than I did w/ the 305.I raced a 2000 stang gt from 60 to 100 and we did not pull on either,I should have been able to get a little edge.Also my SES light comes on after 10-15 min. of driving but does not affect driveability.I got good bottom end w/ 2200 stall and exelent response and timing is set at 10 BTDC.What is the problem?

 

the problem is that your ses light is coming on,, somethings wrong,, what code(s) are you getting??
secondly why do you have 26lb injectors on a stock car? you are probably running extremely rich..
also that hypertech chip is junk,
put the stock chip back,. and the stock 22lb injectors.
tell us what codes you are getting.

 

My original engine is 305 and has 19 psi injectors as well as if I put my stock chip back in it won't help ans far as having26 psi injectors I bought them cheap but I don' belive I am running rich,no idleing problem or strong smell of gas and I can adjust the pressure if need be so I don't realy know.My codes I won't know till this evening when I put it on the scanner.

 

hay cowboy, is this a fresh reblild or a previously owned engine?

 

if i were you id try to get 22lb injectors and get a 350 computer and chip.
22lb injectors @48psi would probably be too rich for your application, let alone 26lb!!

 

No,she is brand new and not even broke in yet you got any suggestions I could use them?

 

Would you suggest dropping the psi to 42 w/ the 26 psi injectors

 

fisrt see what codes you are getting. but the fp definately needs to be dropped a lot.

 

list the parts and peramiators involved in your engine.ex.: cam,headers,intake bla bla bla.that will help people diognose your problems in your quest for more power.

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97 formula w/6speed,cags skipshift eleminator, hurst billet pro shifter, 30#injectors,adjustiable fuel presure regulator,Moroso cold air induction,ported mass air sensor,accell300+ ignition box, accell 9000 wires, bosch platnum4 plugs,flomaster crossflow muffler,Lingenfiter 52mm throttle body,TPIS L98 SuperProfile cam,Crane 1:6 full roller rockers,Edelbrock subframe connectors,Edelbrock strut tower brace.

Other car is a 89 GTA w/700r4w/stage 2 shift kit, corvette servo, B&M mega shifter, TPIS bigmouth intake, TPIS large tube runners, TPIS 52mm throttle body,Edelbrock ported centerbolt heads,LT1 24# injectors,GMPP LT4 hotcam,CompCams Pro magnum roller rockers,Edelbrock headers, flowmaster crossflow muffler, this car is currently under rebuild and restoration.

 

also fix your code problems and give your car some time to break in. you might be happy after everything breaks in.

 

26lb injectors+48psi+stock chip=majorly rich.

The hypercrap isnt helping at all, cars tend to run even more rich with one of those. Your poor engine is drowning in fuel. You have 2 choices, either put 22lb injectors in it, or have a chip calibrated for 26# injectors.

My guess is your injectors are rated at 43(ish)psi, so 42 wont help at all. You would have to drop it down to about 31 (which you probably cant anyway) and that would ruin the atomization.

 

O.K people heres the deal,I ran the scanner and the dats streamand I got something strange.It shows to be in an open loop and running lean,strange!Now the codes I got are MAF sensor(brand new),EST code,O2 sensor(brand new)TPS(never had these codes before the change).Now the engine is stock everything so I already have plans for hedders,cat back,and change in cam but just going from 305 to 350 should be a noticeable difference in power.With increase in fuel it should be a little more too.

 

I forgot a couple of details,I noticed if my car idles and I don't drive,the SES never came on and also I have major pinging no matter where the timing is set.The morans that put my motor in said I would need a temp sensor and my gauge would not work for a couple of days but it does work so he figured the temp sensor is plugged in where the knock sensor goes due to they look exactly alike and that is why my temp gauge works.Do you think that is causing all my problems cause they got one plug mixed up?

 

Could be possible i suppose. I also agree with those who commented above about the 22lb injectors. Take the hypertech chip out and either learn to do your own custom chip or put the 305 chip in. I believe the 305 chip will work but will lean you out some, but not enough to compensate for that kind of a rich condition.

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR
-Gutted Air Boxes

 

make shure the knock sensor is hooked up. then put the stock injectors in and jack the presure up. if your knock sensor is not hooked up it could cause the computer to compensate by retarding the timing.
Hope it helps

 

I am staying home from work and making some adjustments and get theknock sensor hooked up right and lower the fuel pressure and I am also going to check a few plugs to see what they are burning like and I'll let you at the end of today.Thanks for the advice I will try what I can for now.

 

I have got some f**ked up news,we found that the fuel pressure was actualy set at 38psi when it was running and also when on the rack the exhaust pipe at the rear end was crimped almost all the way closed so ther is no pressure coming out my pipes hardly so we will fix that tommorrow and I jacked the fuel up to 42psi and that realy helped.I was running lean on top end.

 

The 305 chip set for 19# injectors will NOT lean the car out. Just the opposite. The 305 chip is triggering fuel based on 19# injectors. Increase the injectors to 26# and you've,, increase the fuel.

It doesn't sound like you're having a "chip" problem. The "chips" are blamed way to often when they are not the major problem. However,, I'm not saying a properly burned chip would not be of benefit.

I'd check you wiring harness and make sure the wires leading to the sensors you're coding on were not crimped during the swap. Sounds kinda funny that you're getting all those codes after the swap,, you know?? I've had people bring me cars just to find a bunch of wires between the engine and tranny.

Good luck!!

 

Well you're running a chip for a smaller engine and injectors for a bigger one along with 4 codes?! I threw an est code awhile back when I had the tan wire unhooked to change timing - so it might just be that whoever set the timing didn't clear the codes. I'd just do the basic diagnostics for the tps etc and get a stock 350 chip in there right away - shouldn't be too tough to find a used one. Are the guys who did the swap reputable?

 

Sorry. I re-read the post. I originally thought the Hypertech chip was for a 350,, but it does not say that. If it's for a 305,, then yep, get a 350 chip from GM. Should run around $45 and be alot closer than what you've got now! What's the year model??

 

News update.First,my fuel pressure was actualy set at 38psi so I boosted it up,(helped some).I found my O2 sensor was unplugged,(plugged it in).SES went off but on the way to work(70 mile drive).it came on again as well as using 3/4 tank of gas.Changing the wire on the knock sensor did't help.As far as the EST code I got,how would I check that cause I still have pinging under accell,no matter where the timing set.As I said before my exhaust pipe at the axle was somehow crimped quite badly.With the extra back pressure would that cause any of my prblems,vibration at higher rpms,loss of power on top end,SES coming on,pinging on accell,I am using 93 octane so it is not fuel.I am gonna put the 305 chip in and remove the 350 hypertech to see what happens.I am running out of options,this car should get up and go.I t seems after 3000r's it has nothing.She is good out of the hole and that is it.

 

Your exhaust being crimped will most certainly limit power, and could contribute to inaccurate O2 sensor readings. Don't really have anything to offer on the other problems other than: Fix the codes in the order that they appear. Clear them all, drive the car till the light comes on, see what ya get, and take it from there.