Couple Hotcam Questions
12-11-2013, 06:41 PM
#41
Did it go faster with the springs? Still on stock rockers? Only friend I had that tried cam only to run stock rockers was with a Lingenfelter 211/219 cam ended up pushing a pushrod through a rocker.
Far as what I had that was quicker you probably have some MPH on what I had but mine was a ZZ4 cam at 208/221 .474/.510 I ran it with ProForm 1.5 rockers because the LT1 iron heads lack the valveseal clearance to run 1.6s on that exhaust lobe. Was a 2800stall Edge and 3.42s and some cheap 28" slicks I had bought so it really was not optimized stall and gear wise. It was however a fair bit less duration, and a lot more weight than an f-body and ran 13.2.
I was turning that cam to 6100rpm.
Far as what I had that was quicker you probably have some MPH on what I had but mine was a ZZ4 cam at 208/221 .474/.510 I ran it with ProForm 1.5 rockers because the LT1 iron heads lack the valveseal clearance to run 1.6s on that exhaust lobe. Was a 2800stall Edge and 3.42s and some cheap 28" slicks I had bought so it really was not optimized stall and gear wise. It was however a fair bit less duration, and a lot more weight than an f-body and ran 13.2.
I was turning that cam to 6100rpm.
12-11-2013, 07:01 PM
#42
11 Second Club
96capricemgr I guess your right with the tranny shifting a bit late compared to the PCM but if a cam peaks at 6,000 rpm then there's no reason to shift it any higher than 6,300 and by the time the tranny shifts the rpm would prolly be closer to 6,500
12-11-2013, 07:44 PM
#43
I swapped to the LT4 springs before the cam change and picked up a consistant 1 mph over the high mile original springs. I did try some crappy Elgin 1.6 stamped rockers and with the LT4 springs had some vlv float at 6K, took off the Elgin rockers. Now I'm running the PAC springs with Comp Magnum 1.6 rockers, good to 6200+ rpm.
Last edited by guppymech; 12-15-2013 at 06:24 PM.
12-12-2013, 05:57 AM
#44
http://www.ls1lt1.com/forum/lt1-%7C-...am-my-z-2.html
I agree with Ed, bone stock cars run fastest shifting at 6000, we took my friends car to the track and he gained 0.3 seconds and 2 mph by shifting at 6000 instead of 5500. Full bolton cars like 6300, myself, shon Herron, and CamaroRacing12 all shift there and shon and tony hit 11s, I'm low 12s. I've played with shift points alot and have timeslips to prove it. A 503 or hotcam car would need more rpm, at least 6500. Ill bet all day long that my bolton only car at 6300 would beat a 503 or hotcam car at 6000 easily. Any takers? I want to point out guppymechs hotcam times are significantly slower than a 6300rpm full bolton car.
Read my link to see my post why.
I agree with Ed, bone stock cars run fastest shifting at 6000, we took my friends car to the track and he gained 0.3 seconds and 2 mph by shifting at 6000 instead of 5500. Full bolton cars like 6300, myself, shon Herron, and CamaroRacing12 all shift there and shon and tony hit 11s, I'm low 12s. I've played with shift points alot and have timeslips to prove it. A 503 or hotcam car would need more rpm, at least 6500. Ill bet all day long that my bolton only car at 6300 would beat a 503 or hotcam car at 6000 easily. Any takers? I want to point out guppymechs hotcam times are significantly slower than a 6300rpm full bolton car.
Read my link to see my post why.
Last edited by bufmatmuslepants; 12-12-2013 at 06:04 AM.
12-12-2013, 07:44 PM
#46
My car had the Hot Cam kit and ran great. Rev limiter was a 6300 though I thought it fell on its face after 6000.
I didn't put the cam in for drag racing, there are many other cam's that cost nearly the same that are better for that.
As a nice driver it was just a lot of fun.
I didn't put the cam in for drag racing, there are many other cam's that cost nearly the same that are better for that.
As a nice driver it was just a lot of fun.
12-12-2013, 08:08 PM
#48
My car had the Hot Cam kit and ran great. Rev limiter was a 6300 though I thought it fell on its face after 6000.
I didn't put the cam in for drag racing, there are many other cam's that cost nearly the same that are better for that.
As a nice driver it was just a lot of fun.
I didn't put the cam in for drag racing, there are many other cam's that cost nearly the same that are better for that.
As a nice driver it was just a lot of fun.
12-12-2013, 08:37 PM
#50
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My car had the Hot Cam kit and ran great. Rev limiter was a 6300 though I thought it fell on its face after 6000.
I didn't put the cam in for drag racing, there are many other cam's that cost nearly the same that are better for that.
As a nice driver it was just a lot of fun.
I didn't put the cam in for drag racing, there are many other cam's that cost nearly the same that are better for that.
As a nice driver it was just a lot of fun.
12-12-2013, 08:55 PM
#51
As several of us regularly say the LT4 springs are marginal at best for a HOT cam in an LT1 with the heavier LT1 valves and the experiences of two of you in the last few posts are backing that up.
If you only want to turn 6000rpm then some LT4 springs and a set of 4.10s for an M6 or a stall for an A4 are better performance mods. Why put in a bigger cam then halfass the performance with insufficient springs when for $50 you could make the stock cam pull to that same cutoff rpm?
If you only want to turn 6000rpm then some LT4 springs and a set of 4.10s for an M6 or a stall for an A4 are better performance mods. Why put in a bigger cam then halfass the performance with insufficient springs when for $50 you could make the stock cam pull to that same cutoff rpm?
12-12-2013, 10:39 PM
#52
As several of us regularly say the LT4 springs are marginal at best for a HOT cam in an LT1 with the heavier LT1 valves and the experiences of two of you in the last few posts are backing that up.
If you only want to turn 6000rpm then some LT4 springs and a set of 4.10s for an M6 or a stall for an A4 are better performance mods. Why put in a bigger cam then halfass the performance with insufficient springs when for $50 you could make the stock cam pull to that same cutoff rpm?
If you only want to turn 6000rpm then some LT4 springs and a set of 4.10s for an M6 or a stall for an A4 are better performance mods. Why put in a bigger cam then halfass the performance with insufficient springs when for $50 you could make the stock cam pull to that same cutoff rpm?
As referenced in my link for post #33, I ran the stock cam, LT4 spring, 4.10, 6K rpm combo and it went 101.22 mph. Then added the hotcam and trapped a best of 107.93 at the same 6K rpm. That's a pretty good comparison for what you're saying above. I think a hotcam can provide good performance even shifted at 6K or so. What I trapped is not far off the best a hotcam car could do.
Last edited by guppymech; 12-15-2013 at 06:18 PM.
12-13-2013, 06:02 AM
#55
I took it from lower michigan up to the UP and it was a dream. Got great gas mileage while having plenty of power for tooling around with the AC on.
I wouldn't have sold it had my car had lower miles and I not wanted an LS1 so bad.
12-13-2013, 08:10 AM
#57
11 Second Club
12-13-2013, 08:57 AM
#58
Like valve spring, set up, valve adjustment, and/or tuning. Even with stock heads, I never had one on my dyno "fall on it's face" past 6000 RPM.
Put LT4 heads on it like many did and the hp peak was 6300/6400 after tuning. Those would run quickest shifting at 6800/6900, ( big-assed intake ports) I never set one that high if the short block had never been apart, or after talking to the ownner that did his own engine, I could tell he didn't know what he is doing I never set them that high. At least unless they specified shift RPM that high. Don't want blamed for somebody spinning a bearing. I had that setup in a 355" I put together when I first started playing with mine. Shifted mine at 6900. Stock crank, rods, SRP pistons. Never did quite get it in the elevens (knocked on the door), but never went to a faster track with it. Never see the DA below 3000' here in the summer.) Just ran it here at Tulsa. 2800 converter & ET Streets, 3.73 gears.
Put LT4 heads on it like many did and the hp peak was 6300/6400 after tuning. Those would run quickest shifting at 6800/6900, ( big-assed intake ports) I never set one that high if the short block had never been apart, or after talking to the ownner that did his own engine, I could tell he didn't know what he is doing I never set them that high. At least unless they specified shift RPM that high. Don't want blamed for somebody spinning a bearing. I had that setup in a 355" I put together when I first started playing with mine. Shifted mine at 6900. Stock crank, rods, SRP pistons. Never did quite get it in the elevens (knocked on the door), but never went to a faster track with it. Never see the DA below 3000' here in the summer.) Just ran it here at Tulsa. 2800 converter & ET Streets, 3.73 gears.
12-13-2013, 09:07 AM
#59
BTW, MPH ( even if it was fast) does not mean shift points are correct. Most cars run a little more MPH when short-shifting high gear. Back when I was setting national records with my '56 Chevy, to set the MPH record high as possible everybody would shift to high gear early on MPH record runs. ET would be slower, but if trying to set the MPH record it doesn't matter. Some guys could set both the ET & MPH records on the same pass, but not many.
12-13-2013, 10:35 AM
#60
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So do you guys think I'd be ok shifting at 6200-6300 on a stock bottom end? As long as I have good oil pressure and everything? It would only be when at the track maybe 2-3 times a year..