Does my T-ReX dyno sheet look normal?
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Does my T-ReX dyno sheet look normal? All bolt-ons except 90mm intake system, fully built 200-R4, PT4400 unlocked, Strange 12 bolt w/4.10 gear, slicks, and stock 241 heads. It peaked a little later than my C2 cam which was around 6300-6400 rpms and the T-ReX was around 6500-6600 rpms. It dropped off quickly after it peaked though which is what concerns me. I had planned to shift this cam around 7000 rpms which is what mostly everyone with this cam shifts at for best results. I know every car is different, but thats just what this cam likes. Anyhow, the first graph is with the SV0 30 lb. injectors that I had to install because I had maxed out my stock ones. It made more power and the lines were smoother with the stock injectors, why is that? The air was a little hotter, but I wouldnt think it would have any affect on the curve, just max power. On the 2nd graph which is with the stock injectors maxed out, the curve was smooth and it stayed along that 400 hp line almost all the way through the pull, but on the 1st graph which is with the SVO 30 lb. injectors, the curve is peaky. Goes up quickly and falls quickly after it hits max power. Just wanted to see what you thought about the 2 graphs. Thanks.
Maybe the tune with the second set of injectors is a little off?? The graph looks about right since you have that 12 bolt and 4.10's. It does have a long and flat powerband, but it's making a good bit of power for a long time. I'd take it to the track and see how it does. Maybe PM Geoff and see if it looks right to him. Regardless, nice #'s.
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9 Second Club NA
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From: Houston, TX
It has a long smooth powerband on the 2nd graph which is with the stock injectors, but the 1st graph with the new/bigger injectors looks completely different. If anything, I thought that the injectors were gonna make it even better as in maybe pick up more power, smooth things out even more, and possible hold the power even longer. I didnt think it would have a negative affect on it. I believe my tuner says he's running 30º of timing throughout the board, is that too much? The air fuel ratio stayed around 13:1 throughout the whole pull, but I would imagine it would lean out a bit on the track as it will have more load. Also, I've been told that these cams like to be leaned out a little bit at top and usually pick up more power. Then adding or taking away something on the low side because this cam is a little sluggish at low end. By the way, the 2nd graph is compressed a bit more than the 1st one, but if you compare power at specific rpms, its still down a bit on power with the new injectors. I can understand that with the hotter and more humid air, but it wasnt a big difference and I didnt think it would have affect on the actual curve.
Launching!
Joined: May 2003
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From: Canadian West Coast
I don't have any experience with that cam, but with respect to the lack smoothness, I don't seen anything that serious to be concerned about. It actually looks as smooth, if not smoother, than most curves I see with stock injectors. But that is all I can add.
Staging Lane
Joined: May 2004
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Originally Posted by Dragaholic
All bolt-ons except 90mm intake system, fully built 200-R4, PT4400 unlocked, Strange 12 bolt w/4.10 gear, slicks, and stock 241 heads. It peaked a little later than my C2 cam which was around 6300-6400 rpms and the T-ReX was around 6500-6600 rpms. It dropped off quickly after it peaked though which is what concerns me. I had planned to shift this cam around 7000 rpms which is what mostly everyone with this cam shifts at for best results. I know every car is different, but thats just what this cam likes. Anyhow, the first graph is with the SV0 30 lb. injectors that I had to install because I had maxed out my stock ones. It made more power and the lines were smoother with the stock injectors, why is that? The air was a little hotter, but I wouldnt think it would have any affect on the curve, just max power. On the 2nd graph which is with the stock injectors maxed out, the curve was smooth and it stayed along that 400 hp line almost all the way through the pull, but on the 1st graph which is with the SVO 30 lb. injectors, the curve is peaky. Goes up quickly and falls quickly after it hits max power. Just wanted to see what you thought about the 2 graphs. Thanks.
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From: Houston, TX
Camaro ChriSS, are you looking at the 1st or 2nd graph because the current graph is the 1st one which is with the new injectors. I thought it was a bit nasty compared to the 2nd graph with the stock injectors. The power was held longer, curve was smooth, and it made more power with the stock injectors. Doesnt make sense to me.
LS6 SS, well my tuner was adding fuel, but the air fuel ratio wasnt moving. He said for every fuel table he adds, the air fuel ratio moves about a whole point. Nothing was happening with my car. Put the injectors in and instantly it was almost dead on where he wanted the air fuel ratio to be. I maxed out my injectors because in a 6 speed, I'm pushing around 450 rwhp. I put down 420 rwhp back when it was a 6 speed, with the C2 cam, and tons of mods ago. If I picked up 35 rwhp with this new cam, add that to the power I was putting down before, theres 455 rwhp right there. Plus all the other mods I did as well. I've been told that the stock injectors handle around 450 rwhp. It only puts down roughly 400 rwhp now because this is through an automatic, loose unlocked converter, 12 bolt w/4.10 gear, and on slicks. My tuner says he put in 30º of timing, but I've been told that is a bit on the high side. My stock injectors were 26 lb. by the way.
Got Me SOM, why do you say I'm out of fuel? The air fuel ratio is good now and I just upgraded to the SVO 30 lb. injectors.
LS6 SS, well my tuner was adding fuel, but the air fuel ratio wasnt moving. He said for every fuel table he adds, the air fuel ratio moves about a whole point. Nothing was happening with my car. Put the injectors in and instantly it was almost dead on where he wanted the air fuel ratio to be. I maxed out my injectors because in a 6 speed, I'm pushing around 450 rwhp. I put down 420 rwhp back when it was a 6 speed, with the C2 cam, and tons of mods ago. If I picked up 35 rwhp with this new cam, add that to the power I was putting down before, theres 455 rwhp right there. Plus all the other mods I did as well. I've been told that the stock injectors handle around 450 rwhp. It only puts down roughly 400 rwhp now because this is through an automatic, loose unlocked converter, 12 bolt w/4.10 gear, and on slicks. My tuner says he put in 30º of timing, but I've been told that is a bit on the high side. My stock injectors were 26 lb. by the way.
Got Me SOM, why do you say I'm out of fuel? The air fuel ratio is good now and I just upgraded to the SVO 30 lb. injectors.
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Staging Lane
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my currents mods are all the bolt's and LSX 90mm intake with TB with TREX CAM and a PT4600 with a built 4l60e and a 12 bolt with 373 gears on 28" MT and i am runnning 28 of timming i think 30 is little to high for pump gas even 29 i think is pushing on pump gas
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Yeah, I believe the '01-'02 models come with 28 lb. injectors, but I may be mistaken. Anyhow, I had to upgrade because the air fuel ratio wasnt moving as fuel was being added. Either way, I feel better about it because Id rather my injectors run at a lower duty cycle. Basically we have the same setup, but yours is an '02, mine is a '00, you have a 3.73, I have a 4.10, you have a 28" slick, I have a 26", and youre running a PT4600 and I'm running a PT4400. I'll talk to my tuner and see what he says on the timing.
Staging Lane
Joined: May 2004
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Originally Posted by Dragaholic
Yeah, I believe the '01-'02 models come with 28 lb. injectors, but I may be mistaken. Anyhow, I had to upgrade because the air fuel ratio wasnt moving as fuel was being added. Either way, I feel better about it because Id rather my injectors run at a lower duty cycle. Basically we have the same setup, but yours is an '02, mine is a '00, you have a 3.73, I have a 4.10, you have a 28" slick, I have a 26", and youre running a PT4600 and I'm running a PT4400. I'll talk to my tuner and see what he says on the timing.
