i recently broke in my new motor and wanted to see what it could do. it's a 355 with the HSR, SLP headers, Accel 24# injectors, MSD 8.5mm plug wires, etc. i own a g tech and did a few runs. my best time was a 15.12 @94.5. that's **** poor. i expected a little bit more with my setup. the only explanation i can come up with is the computer chip. i have all the burning equipment for it, but right now it's a stock 350 chip cause i'm still in the process of learning how to do it. but can the chip really be choking that much power? or can it be something else? any input is greatly appreciated. thanks here's a pick of it, may be slow, but sure is pretty!

 

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This belongs on the Tech/General Engine Board.

 

Yup.

 

a chip shouldn't mess it up that bad. with that setup I'd say you should be able to hit a good 12.5 with out chip changes. what all mods do you have to it? please list everything in the motor and drivetrain. that will be more helpful then.

 

I agree, it should be able to run 12.5ish! I have a similar problem. Brand new engine 355, ford 24lb injectors, slp runners ported intake and plentum, AFR 190 heads, 9.3/1 compression, ZZ3 cam, crane hi6s ignition. last year with the stock engine i ran a 13.0 with my supercharger. I ran teh exact same time with the new engine! Something is up? I have checked EVERYTHING! Airfuel..perfect, cam install perfect, spark....goood timming 6deg advanced...??????

 

here's a list of everything i know:

CRANK: Performance ground factory crankshaft
RODS: GM forged steel rods
PISTONS: Speed pro hypereutectic
CORE PLUGS: Brass Pioneer core plugs
LIFTERS: Comp cams hydraulic
PUSHRODS: Comp cams
ROCKER ARMS: Factory stamped steel
TIMING SET: Cloyes true-roller
OIL DELIVERY: Melling high volume pump
HARMONIC BALANCER: Pioneer Performance
HEADS: GM Factory, Cast iron, Intake runner 150CC, Intake Valves SBl Steel 1.94", Exhaust Valves SBl Steel 1.50", 9.5:1 Compression ratio
CAM: Comp Cams, Intake 230*@.050", Exhaust 236*@.050", Lift Intake 0.480", Exhaust 0.480", Lobe Seperation 110*
Holley Stealth Ram
Holley AFPR
SLP 1 3/4 dual cat headers
MSD 8.5mm plug wires
stock fuel pump
air foil
stock 48mm throtle body
T-5 transmission w/3.42 rearend
No air conditioning
Accel 24# injectors
Straight pipes
I think that's it

 

spark, fuel, air//////////// what is your vacume reading? what do your plugs look like? fuel psi through the rpm range? BLM's???

 

I'l bet this motor has stock low performance smog heads.
What is the casting number on the heads. ? (under valve cover)

 

Stock heads, big cam, 24# injectors, HSR, and SD system make for a bad match / tune using the stock chip. There is probably a good bit in the tune. How fast you could go will depend on the head castings and how willing you are to ride the clutch.

I've never tried to run "factory stamped steel rockers" with that much lift You might want to check the rocket arm slots to make sure they are not binding on the rocker arm studs.

 

15.12@ 94.5?? your mph seems pretty good but the e.t. is terrible.. any traction problems? will the g tech give you a 60' time? i do love the new motor though- looks stellar

 

Time for some tuning and making sure that all your parts match properly. How's the rear end, stall, cam and intake match? Are you getting traction. I know it's disapointing but tuning is a key. Look at my motor in the sig and Im only running 13.1 with street slicks, 4.11 Moser rear, 3600 stall etc., etc..

 

That's just sick. I'm glad you have the guts to admit it, because alot of people would be too embarrassed.

It's your chip, dude. You've got the stock fuel and spark curves, on a nowhere near stock setup. You can't change carb jets ot distributor weights; the only way to change that motor from a grocery cart program to a screamer program is by reprogramming it. Until you get that stuff right, you have exactly as much of a mismatch between the motor's mechanics and its programming, as you would if you had taken a 74 Impala 350 2-barrel, put a set of SB2 heads on it, and some Stahl headers, and a Lenco transmission, and a 5.13 gear, and left the 2-barrel carb sitting there.

You need to invest in some PROM burning gear, or get a DFI or SpeedPro or Haltech.

 

Holy sht. I'm surprised that even runs on the stock chip. Ick...you took it out and did some 1/4 mile blasts with it like that. I'm not preaching, but that's icky...

That blows my mind...my engine wouldn't even idle before all the tuning and the cam is NOWHERE near that big.

 

well for one, i've heard that the g-techs are pretty unreliable sometimes. so before you get worried that something isn't right, i'd take it to a real track and see what kind of times you run.

 

yes i know it's embarrasing times to post for a non stock camaro but i'm trying to figure why it's so bad. at some points it pulls real hard, but then lags. in 1st gear i spin em a little, not to bad, and it feels like it has some power, but then 2nd gear really kills me, the motor was supposed to make good power up till 6000, but i find it losing power at around 5400. but then at around 4800 in 3rd it starts to pick up again and pull hard to about 115 and then starts to drop in power. it has really weird power bands. i'm hoping cause it's the stock chip. but this is really pissing me off, cause i spent all of my money on this motor and for it to run stock times and get 9.8 miles to the gallon, yes that's right 9.8, it isn't worth having so i might end up selling it which is very disappointing to think about cause i put so much time into fixing it. the only upsides are that it sounds bad ***, like a real muscle car, it looks really cool when i pop the hood, and i can sure burn some rubber and lay some nasty stripes, but i just wish i could break into the 13s, that's not asking so much is it? well thanks guys if anything i've learned my lesson the hard way like usual.

 

Dont give up yet!!! You really dont expect to drop in a new motor and off to the races and bring back trophys do ya...the key is tuning..rb and f bird said it best...TUNING is the key! These are not plug n play Cars! You have to be willing to get a little dirty and accept some failures...get off the poor me stuff and get buisy! You have a ton of power waiting to get out!

 

Wow, I am surprised to hear it even runs, I have read that speed density does not respond good to some cam changes and will run like crap. I have been second guessing for a while now whether to put in a ZZ4 cam and upgraded intake components in my brothers 91 Vette because of this. I honestly have little to no knowledge of how to modify Speed density systems other than what I have read, getting new chips burnt to match every little change and so on, but after reading that his car runs at all I am thinking of going ahead with the swap.
Anybody have any advice for me?

 

Dude seriously stop running that car with that chip, before it washes the rings. IT must be spewing a huge cloud of black smoke behind you. you are prolly giving up a 100 hp to the chip. if you change a cam in Speed Desity car you MUST have a new chip programmed. Speed Density is better than MAF but you have to tune it.

 

Also a 150CC intake head is pretty small. Got any flow numbers on them?

 

NEVER sell you car because their is a problem that can be fixed with it.

 

i didn't mean for it to sound that i was going to sell my car cause of the problems, what i meant to say was that i'm kind of in need of money badly and i just feel it isn't worth working my *** off to pay my debt for a 15 sec car when i could just sell it and pay everything off and have some left over. i figured if i'm in the 13s by mid summer then i'm keeping it, if not then goodbye for the camaro.
black smoke doesn't come out of the exhaust, but white smoke does when i first start it and till the motor warms up. i've actually haven't driven it in for about 2 weeks now cause of an oil leak. i suspect it's from the valve covers cause i see some dripping on the headers, but after a 5 min drive there is oil sprayed on the side of the plenum, fuel rail and injectors. can this be from the valve covers too? where else can it be coming from? thanks

 

Wow man no offense but you have so much to learn about cars. I have been trying to get my car going fast for years... since 15 years old (22 now). Ive gone from a 16 sec car to a 13.1s car and I am still dissapointed. I spent about 9k on my motor, another 3k for the rear end and brake system, 1k for a 4" exhaust, 400 on long tube headers, etc., etc. Take your time and dont get angry. I know it s*cks believe me man!! This the third motor in my car and this motor should be running 11s with all the goodies I have in there. I plan on putting in my 4" mufflex exhaust this week and then is carb tuning time. Just take your time and be patient man you'll get there.