whitecomet

my car runs like it has v-tech or a laggy turbo. It doen't have alot of power til after about 3000rpm then it smooth and pretty quick. its timed at 10 degrees TDC w/ 40psi fuel and my wideband reads around 15.2 at idel. Would anybody know how i can get that better throttle response or what ever my problem is?

Guest

That sounds about right-

T/Aperformance

Well whats bean done to your engine?
What tune has bean done if any to your computer?
what size injectors?
Really before anyone can give you any type of an answer we need to know all about your engine combo.

whitecomet

new stock cam roller, 1.6 roller rockers all around, no tune on the computer, new 22lb injectors, BBK afpr, 7k mile 355 corvette 4 bolt main w/ flat top pistons, stock crank, stock 700r4 tranny, CAI. stock coolant bypass throttle body, stock plenum, stock runners, intake manifold, stock rebuilt L98 heads w/ stiffer value springs. new MSD 8.5 coil spark plug wires w/ Accel shorty plugs stock gap (.035) New MSD distributor w/ MSD cap and rotor just did tune up ( spark plugs, wires, fuel filter, oil, etc.) stock 9 bolt B/W rear end

whitecomet

new egr too, no vacuum leaks either just replaced all the plastic vacuum lines to the rubber ones, new disc brake rotors and pads too, just got the exhaust done as well long tube headers, custom y-pipe (2
: 2.5" inlet to 1: 3" outlet to 3" dump to 3" high flow new cat to 3" indeterminate pipe over the axle to a 1 in 2 out 3" edelbrock SDT muffler.

whitecomet

just checked the tps voltage as well and it reads .58 then at WOT its 4.18

T/Aperformance

Well first try setting your timing to stock and I believe that should be at 8 degree not 10, your computer is set to the factory setting and does not know its bean changed.
Also set your TPS to.54 to .56 not .58 again your computer does not know of the non stock change you have made.
I see you have an adjustable FPR. Try adjusting it up just a bit to 45 lbs at idle. You seem to be running a bit lean at idle.

Guest

WOT AFR on my wideband is any where between 11.3-12.8.
(depending on conditions)

Guest

stock is 6 degrees advanced

jjcuff1

T/A performance had the right tips.

You have enough mods that your stock PCM is borderline needing a tune. Sounds like you bumped compression up and little more lift you are flowing more then stock. Running little lean at idle suggest you have more vacuum (compression is up)

But at WOT your AFR 11.3-12.8 is rich. Your engine is loading up runnig rich but your tranny is not stalling enough. Hence your 3000rpm limit. You said stock 700r4. I bet with little more fuel pressure tuning, a new bigger stall you will be hooking up pretty solid.

You should be around 14.2-14.7 at idle until you warm up. High way cruise, no load, no throttle tip in you might see 15-16, 17 on economy tunes.

WOT you should target 12.7 anything below 12.2 you are running rich and will feel that bog into the mid 11's below 11.5 and in the 10's you are pig rich and she will feel like a dog.

Tuned Performance

iTrader: (92)

Do you have a data log showing your int/blm ? Is the memcal from a 305 or 350 ?
I didnt see mentioned what camshaft you are using .

Guest

Mine is mainly in the high 12s at WOT. I saw 11.3 for a split sec last night.

jjcuff1

EVGAX58: That sounds right on.

midias

Your car runs like a cordless phone?

I wish my car ran like it had VTEC

whitecomet

the v-tec part isnt as fun as you might think lol i have a new camshaft but its a stock spec. cam. The wideband does jump around quite a bit i see all sorts of numbers but at WOT i see it hit in the 12.XX maybe 11s i just installed it like a week ago, but i digress i never see it drop more then 11s for sure. i wouldn’t argue that my stock computer needs a tune but i don’t know what to direction to go iv been doing research but haven’t came to a final conclusion of which to chose. i checked my tranny fluid and its about a half quart over full and when i installed the tranny shift cable (the part that connects to the transmission its self) i just threw it on i never tried adjusting it. possible problem? no data logging showing int/blm. to be honest i dont know what "int/blm" is or the memcal. lol but i would guess the memcal is from a 350 because the car has always had a 350 tpi i jus swapped out the 2 bolt main to the 4 bolt main.

midias

Real VTEC is awesome especially on larger engines. They never fall flat on their face when you rev them up. But what I was really getting at was this.

Time to start tuning and burn some PROMs

whitecomet

o and ive never adjusted the TPS ever. the readings were like that sense day one. and if i retard the timing to much it runs even worse all boggy an loppy or not at all and ever sense iv had the car its been more like 12 degrees advanced an ran fantastic i was able to hit a 15.2 on all bolt on stock engine. but ill try an retard the timing to 8and 6 degrees see how it runs after each. After i up the fuel psi to about 45 psi. im way up in Denver altitude is 5,280 ft. elevation figure that would be a big variable no?

Guest

Get a 91-92 Camaro TPS sensor...aka the non-adjustable 1.

Tuned Performance

iTrader: (92)

that would keep the feedback voltage to high for the 1227165 ecm, you need a adjustable one. I do not see a log here that shows a open or high reading on the tps. you can check it koeo .54v on the blue wire on the tps.

whitecomet

I'd admit that my TPS voltage is slightly higher then most but can it really make that much of a difference? I'll still adjust it to what its suppose to be regardless. especially if it can help.

Tuned Performance

iTrader: (92)

If the minimum idle speed has been set correctly at idle or koeo the feedback is .54v .

T/Aperformance

When you rebuilt your engine or had had it rebuilt, did you use a timing gear that gave you a choices of different timing advances?
Let us know what your rpm is at idle how it is now, then when you adjust the timing back to 6 degrees. If its really low and barely running you might want to adjust your throttle until it is running smoothly, Then check your TPS , You may have to adjust your throttle and tps a few times until your rpm at idle is where it needs to be and running smoothly.
Then think about getting a chip tuned for your application. I would go to moates.net and get an ALDL so you can do some data logging, This will help when you decide to get a tuned chip. I think tune performance can help you out there.

Tuned Performance

iTrader: (92)

whitecomet

my car idles very smooth at about 600 rpm at idle. instead of a ALDL data logger i was thinking about buying a jumper harness so i can keep my stock wiring harness an plug in a mega squirt computer or i mite go with the AFC neo jus so i can tune it that way but ill continue to look for a chip as well im ganna retune it tonight ill let everyone know how it went after the tune.