Would putting the LT1 cam in my car move the power band up father than what it as with peanut cam since the car came with the peanut cam and not the LT1? and if so why?

I dont know if its the car or just me cause I havent driven the car in so long but it feel like I have lost low end...could it also be that since I have put the LT1 cam in and still running my 2.73 gears...they do not like eachother? and if so why?

Would getting a stall and new rear gears such as 3.42's make my car feel like it used to and give me my lowend back?

It may just be me but maybe you guys know more about it..

my cam is now at 203 210 477 490

thanks!

 

come on.......Im sure someone has to know?

 

I'm not sure but would imagine it would. Probably wouldn't bump it up too much because of TPI. Figure a LB9 peaks at 4200 right? Well TPI is the limiting factor there, I doubt you'll see anymore than a 1-200 RPM increase in MAX HP. As a general rule, the bigger the cam the higher it needs to spin for MAX HP. LT1's peak a good bit higher but it's almost all because of the intake design not the cam specs.

 

well in my 350 didn't change the rpm band at all. just made more power. http://www.fl-thirdgen.org/mrr23/ima.../dyno14-15.jpg

 

It is significantly bigger than the peanut cam, so it'll need some more rpm to get it's power. LT1s peak power are at 5200 rpm stock, compared to the peanut cam..what around 4200 rpm or so...so your power w/ the TPI should shift up in the higher rpm range. So yeah you might lose some low end tq (below 2500 or so). Now that you have the LT1 cam, you should get a new intake, one that will flow much better. But the LT1 heads are much better than the LB9 heads as well, so your peak rpm power won't be quite as high, but it'll be better than w/ the TPI intake.

 

Im going to go have it dyno'ed this week and see what its doing. I'll drop by and see Roy at TGR. I wonder what my HP/TQ is now...I used to be 184/264..I know I know...but its a start!

I can tell I got more power but it feels like it moved up...when I would normally have ran in 4th or even 3rd....sometimes I can drop it down a gear to make me feel like I have some power cause if I keep it in the gear when my rpm's are so low and punch it there just isnt any power like I would think. Maybe it is my gears...I hope so...

I can run 70 on the highway and only be doing about 1800 rpms....thats in 4th and when I drop it down to 3rd I feel like I have the power I need..I feel like I can even drop to 2nd but I havent tried that yet..kinda scared to!..LOL

and it didnt used to feel that way when I had the stock crappy cam in...

 

You did change the valve springs when you put the cam in, right? If not, that would cause the loss of power, as the valve springs are now working harder than they should be.

 

the lt1 cam is not much different than the TPI cams
all are between 200 and 203 duration. if it were me and I wanted to install a cheap mild cam upgrade I would go with the ZZ4 cam

 

Close. Here are the specs on 94-96 LT1's

Duration......1.5 rockers....1.6 rockers...LS...year
205 207......447 459 ........477 490....117....96 LT1


203 208......450 460.........480 491.....116....94-95 LT1

 

Wish,

You are exactly right. With your LT1 cam you have shifted the powerband upward in the rpm cycle. Moreover, your 1.6 rocker arms have actually exacerbated the problem, effectively creating more lift and duration--which shifts the band upward still!

The LT1 cam with stock 1.5 rocker arms is a nice improvement over the old "peanut cam" but you need to get into those higher rpms quicker, in order to get over the loss of lowend torque. As you surmised, a set of 3.42 gears will compensate very nicely, indeed.

A nice 2000 to 2500 rpm torque converter will add even more low end grunt, for exactly the same reason--it gets you into your new powerband much quicker

If you still have your old 1.5 rockers, try them out again and see if you notice a low end improvement. It may be that with 3.42 gears and a higher stall TC you can take advantage of the 1.6s but your other limiting factor is your TPI intake. It just can't breathe successfully above about 4500 rpm. I believe if you siamese the intake runners you can free up this shortness of breath and allow the engine to hit the 5000 rpm region, where the LT1 cam will be making its maximum power.

PS The 3.42 gears are an ideal choice because they will still allow you to only be turning the engine in the 2000 rpm region at highway speeds in overdrive, roughly at 65 to 70 mph. That's why most Corvettes have always used the 3.5x series of gears from the factory.

Around town you will probably not notice any loss of mileage at all, because the overdrive will simply come in somewhat sooner, again keeping your cruise rpms down and thus saving fuel. (At least this is my experience with this typpe of engine and gears. I even gained 1.5 mpg after finishing all the mods on my 305--while doubling the hp!) The torque converter may or may not affect mileage but it won't be severe if it does, maybe a mile per gallon or so.

If you want another 30 hp or so, just port and polish your stock heads. It is not hard and you can certainly do it. Just follow the link at the end of my sig

And finally, ALL of these mods will successfully make the transition over to a nice 350 once the 305 bites it. You gotta like that

 

I threw away my old rockers cause they were the stock ones at that. I guess I need to start hunting some better gears. I have also noticed that my gas milage sucks now. Could that be cause im having to put my foot in the gas more cause my lowend it gone? I mean its really not gone but its not what it used to be.

What would cause my bad gas milage? I think I have the fuel pressure set at around 48..is that to high?..Im waiting on cable to get here so I can run the car on the puter and see whats going on..,but thats a different story cause I will have no clue how to read what data I record.

I took my car by the a guy that wanting to see it and he asked if I had the heads port, I told him no..he was like..."WHA!!! DUDE you were right there at them when you tore it down to change the cam...you just missed out on a real HP gain" ALOT!

oh well?!!

 

Yes, your cam/mileage reasoning seems correct again. 305s just don't like being messed with in the low rpm torque region. The displacement is just too small, so gears and a tc are in order. Also, you MUST get a tranny cooler installed. They are only $30 or so and will literally double the life of your tranny

As for the fi, I'm no expert so try the forums at www.thirdgen.org and see what they say.