Problem after h/c install.
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From: HorsePower Central
Problem after h/c install. That's right guys, got it dynoed, and it put down a whopping 322 hp and 281 tq. Those numbers are correct, and im not lying. I think its the strongest it has every been, and yet im mad, disgusted, and ready to sell the pos.
The air/fuel looked good, timing was really close. The rockers adjusted, and it just would not pull. It's got a miss from i dont know where. the graph was all over the place. the cam fell flat on its face at about 6100. the car would lose power then just all of a sudden regain it. it would basically bog down, then take off. once the car is held at a constant rpm it bogged down then regained it. i know its hard to understand but it is also hard to explain. the car since its fuel is right sounds like the hotcam. the cc306 sounded better to me, my brother thinks so to. anyway, they are going to run a compression check on all cylinders then we'll go from there. its a wonderful day to be a lt1 owner.
i changed to stage 3 heads and put in the xe236/242. it doesnt look like there's vavle float either. just dont know...any ideas.
The air/fuel looked good, timing was really close. The rockers adjusted, and it just would not pull. It's got a miss from i dont know where. the graph was all over the place. the cam fell flat on its face at about 6100. the car would lose power then just all of a sudden regain it. it would basically bog down, then take off. once the car is held at a constant rpm it bogged down then regained it. i know its hard to understand but it is also hard to explain. the car since its fuel is right sounds like the hotcam. the cc306 sounded better to me, my brother thinks so to. anyway, they are going to run a compression check on all cylinders then we'll go from there. its a wonderful day to be a lt1 owner.
i changed to stage 3 heads and put in the xe236/242. it doesnt look like there's vavle float either. just dont know...any ideas.
Originally Posted by BlkLT1WS6
322? H/C? is that a joke u should make 350 cam only!
Anyways, take it to the track dude. Dyno #s in a stalled auto don't mean jack **** - I dyno'd 314rwhp and still went 12.2 @ 109.
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From: HorsePower Central
tranny feels fine, has about 2000 miles on it. they were in the process of tuning it, but couldnt figure out the miss. like i said it would bog down when giving gas, then just take off and go. acts like it losing power then regaining. plug wires seemed fine. fuel looked good.
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when you say you give it gas and it bogs down do you mean when you first start to mash the gas or later on? if its when you first push the gas i would check the TPS voltage and see if it fallin off for some reason. you mite as well do it anyway. you mite find your problem there.
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From: LT1 land...the "409" of the 90s!
Originally Posted by MattZ28
And you shouldn't be posting here. Please show me a stalled auto making 350 cam only.
Anyways, take it to the track dude. Dyno #s in a stalled auto don't mean jack **** - I dyno'd 314rwhp and still went 12.2 @ 109.
Anyways, take it to the track dude. Dyno #s in a stalled auto don't mean jack **** - I dyno'd 314rwhp and still went 12.2 @ 109.
346 cam only bolt ons here
I would be checking all the basics right down to the timing chain.
Phil's stuff usually works great!
yea, it's possible to get around 350 with a cam, but thats a pretty big cam, also Dyno numbers with a stall are low, but just wait till you take it to the track, a 6 speed car could dyno 50 more horses with the same setup, but at the track they'll be pretty even (considering the 6 speed has a good driver). Your torque seems really low, you should normally see a little more trq then hp with these motors, thats what is bothering me the most, also that power curve doesnt look all that good, but I still don't understand the low trq levels.
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From: HorsePower Central
new walpro255 pump, with new 30injectors. fuel filter is a couple years old.
it will bog at both time, when i first give it gas, and just holding it at a rpm. just all of a sudden it will lose power and slow, then just regain it and go. i have not drove it this is just on the dyno. and when you give it gas or mash it, it almost sounds like it detonating.
it will bog at both time, when i first give it gas, and just holding it at a rpm. just all of a sudden it will lose power and slow, then just regain it and go. i have not drove it this is just on the dyno. and when you give it gas or mash it, it almost sounds like it detonating.
another thought. when was the opti cap and rotor replaced? same thing with the coil. if the coil is old then when you rev on it, it mite be trying to get more voltage than what it can actually supply. check both. but i replaced the opti on mine cause it had a crack in it and was making the opti arch off. but i kinda feel like the problem mite lie somewhere with the electrical
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From: LT1 land...the "409" of the 90s!
OK I have one for you to check that I have had issues with lately.
Hook up a scanner and check all your Temp sensors. If they are not working they will read -40*. When this happens it will pour fuel like crazy into the engine.
I have a car right now that has a bad sensor. had I not used a good Scan tool on it I would have missed the temp sensor tripping out! With 42Lph injectors the Temp Sensor reading -40 is enough to kill the engine It will buck and snort and go crazy!
I have had IAT and ECT sensors do simular things MY shop car would not even start with out the temp sensor and IAT being plugged in
Some thing to check
Hook up a scanner and check all your Temp sensors. If they are not working they will read -40*. When this happens it will pour fuel like crazy into the engine.
I have a car right now that has a bad sensor. had I not used a good Scan tool on it I would have missed the temp sensor tripping out! With 42Lph injectors the Temp Sensor reading -40 is enough to kill the engine
It will buck and snort and go crazy!I have had IAT and ECT sensors do simular things
MY shop car would not even start with out the temp sensor and IAT being plugged in Some thing to check
My $.02...
Originally Posted by Flamed350
here is the dyno graph guys, what you think.
The A/F on the dyno sheet looks to me that the engine is steadily losing fuel. Starts at 12:1, and steadily heads towards 14:1??
I'd suggest you install a GOOD quality fuel press gauge, and watch it, as the engine goes thru the rpm range.[loaded]