TU1 cam too big for my 5.3?
#1
TU1 cam too big for my 5.3?
I'm looking at picking up a used Speed Inc. TU1 for a good price used. It's a 225/225 .588/.558 113LSA cam if I recall correctly.
I'm running a stock bottom end L33 (9.9:1 CR), head bolts, LS9 gaskets, and other supporting mods. Turbo is a TC76 with E85 and I only want to spin to 6,200RPM.
I really haven't found anyone with this exact combo and my fear is that it's too big and will be way too peaky for me (I'd rather have a broader torque curve). But then I found this which indicates it may be not too bad at all:
(ignore the flat power up top, he thinks it was due to back pressure issues)
That's on a 347 9.5:1CR with a TC78, so similar.
Any thoughts? I will, of course, be using good springs (Patriot Gold duals) and nice pushrods.
I'm running a stock bottom end L33 (9.9:1 CR), head bolts, LS9 gaskets, and other supporting mods. Turbo is a TC76 with E85 and I only want to spin to 6,200RPM.
I really haven't found anyone with this exact combo and my fear is that it's too big and will be way too peaky for me (I'd rather have a broader torque curve). But then I found this which indicates it may be not too bad at all:
(ignore the flat power up top, he thinks it was due to back pressure issues)
That's on a 347 9.5:1CR with a TC78, so similar.
Any thoughts? I will, of course, be using good springs (Patriot Gold duals) and nice pushrods.
#2
I think it will be fine for your 5.3, but why do you only want to spin it to 6200?
When I had my turbo SS I thought I was spinning it to 6500, but when I went to look back at some data logs I really was only spinning it to 6200. The way it picked up power from 5800 on was amazing and I thought it was really 6200 that it was starting to really pull on top end with when in all reality it was 5800. I can only imagine how it would of pulled if I had spun it truly to 6500.
When I had my turbo SS I thought I was spinning it to 6500, but when I went to look back at some data logs I really was only spinning it to 6200. The way it picked up power from 5800 on was amazing and I thought it was really 6200 that it was starting to really pull on top end with when in all reality it was 5800. I can only imagine how it would of pulled if I had spun it truly to 6500.
#3
I think it will be fine for your 5.3, but why do you only want to spin it to 6200?
When I had my turbo SS I thought I was spinning it to 6500, but when I went to look back at some data logs I really was only spinning it to 6200. The way it picked up power from 5800 on was amazing and I thought it was really 6200 that it was starting to really pull on top end with when in all reality it was 5800. I can only imagine how it would of pulled if I had spun it truly to 6500.
When I had my turbo SS I thought I was spinning it to 6500, but when I went to look back at some data logs I really was only spinning it to 6200. The way it picked up power from 5800 on was amazing and I thought it was really 6200 that it was starting to really pull on top end with when in all reality it was 5800. I can only imagine how it would of pulled if I had spun it truly to 6500.
#5
i think itll work really well in a 5.3. And youre smart on keeping the rpms low to keep it alive. Im pulling my rev limiter down 6500 and shifting at 6200 to keep my motor together.
cam only i spun it to 6600ish but i wouldnt even think about trying that under boost
cam only i spun it to 6600ish but i wouldnt even think about trying that under boost
#7
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From: Joliet,IL and Las Vegas 50/50
Wait a second, that graph looks familiar?!?! where have I seen that before.
lol, here is a better graph btw. It wasn't backpressure, but more due to the short filter I had on the compressor causing it to fall off up top and start to collapse my filter. I also replaced the diaphragm in the tial wastegate since it was pinched.
lol, here is a better graph btw. It wasn't backpressure, but more due to the short filter I had on the compressor causing it to fall off up top and start to collapse my filter. I also replaced the diaphragm in the tial wastegate since it was pinched.
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#8
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From: Joliet,IL and Las Vegas 50/50
Also, according to Larry@AMS when I got the car tuned the rpm was a little off
Blue line represents race gas and others are on spring pressure and 12.5 psi on pump.
The last sheet i uploaded was on 12.5 psi on 93 octane
Blue line represents race gas and others are on spring pressure and 12.5 psi on pump.
The last sheet i uploaded was on 12.5 psi on 93 octane