TREX cam with a turbo?
04-09-2010, 09:47 AM
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TREX cam with a turbo? Has anyone used a TREX cam with a front mount turbo? I know the 110 LSA probably is less than ideal, but I love the sound of that cam!
04-09-2010, 01:30 PM
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I heard they work especially good on 5.3's with a T2 flanged turbo. Now if someone could just make a 88 fit on a T2 flange...
Last edited by jimbob; 04-09-2010 at 01:36 PM.
04-15-2010, 02:27 PM
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It's all about the combo...Just like NA cars.
I came from the side that you have to have everything perfect to make good power (LS1's, you just stare at them and they'll make good power). You almost can't screw them up....except when going FI... A cam that big will make power in a high rpm or big motor. The turbo will compensate for the overlap and overall duration. However, off boost you'll loose efficiency and can be down right doggie in a smaller cube/low compression big turbo set up... I personally like smaller cams in turbo cars when your not trying to go 8's or better. I have a friend that goes 9.7's in a twin turbo older c5 Z06 vette. 13lbs of boost and stock everything. Made like 717 crhp (dynojet) through an auto that he had installed. Food for thought...
To answer your question.... it might be hard to find someone who uses that particular cam in any turbo combo. Most go stock/near stock or have a cam spected to their combo. You could always try it and see if you can handle they way it acts...I say probably not going to like it on a 70-76mm turboed 5.7-6 liter engine unless you have 10 to 1 compression to help compensate off boost.
Hopefully, someone with that cam or similar will chime in for you. But, most will shy away until you can give them a combo that you plan with this cam...
I came from the side that you have to have everything perfect to make good power (LS1's, you just stare at them and they'll make good power). You almost can't screw them up....except when going FI... A cam that big will make power in a high rpm or big motor. The turbo will compensate for the overlap and overall duration. However, off boost you'll loose efficiency and can be down right doggie in a smaller cube/low compression big turbo set up... I personally like smaller cams in turbo cars when your not trying to go 8's or better. I have a friend that goes 9.7's in a twin turbo older c5 Z06 vette. 13lbs of boost and stock everything. Made like 717 crhp (dynojet) through an auto that he had installed. Food for thought...
To answer your question.... it might be hard to find someone who uses that particular cam in any turbo combo. Most go stock/near stock or have a cam spected to their combo. You could always try it and see if you can handle they way it acts...I say probably not going to like it on a 70-76mm turboed 5.7-6 liter engine unless you have 10 to 1 compression to help compensate off boost.
Hopefully, someone with that cam or similar will chime in for you. But, most will shy away until you can give them a combo that you plan with this cam...
Last edited by jimbob; 04-15-2010 at 02:43 PM.
04-15-2010, 02:42 PM
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[QUOTE=jimbob;13192428]It's all about the combo...Just like NA cars.
I came from the side that you have to have everything perfect to make good power (LS1's, you just stare at them and they'll make good power). You almost can't screw them up....except when going FI... A cam that big will make power in a high rpm or big motor. The turbo will compensate for the overlap and overall duration. However, off boost you'll loose efficiency and can be down right doggie in a smaller cube/low compression big turbo set up... I personally like smaller cams in turbo cars when your not trying to go 8's or better. I have a friend that goes 9.7's in a twin turbo older c5 Z06 vette. 13lbs of boost and stock everything. Made like 717 crhp (dynojet) through an auto that he had installed. Food for thought...
To answer your question.... it might be hard to find someone who uses that particular cam in any turbo combo. Most go stock/near stock or have a cam spected to their combo. You could always try it and see if you can handle they way it acts...I say probably not going to like it on a 70-76mm turboed 5.7-6 liter engine unless you have 10 to 1 compression to help compensate off boost.[/QUOTE
Mahle -4cc dished pistons,scat rods,stock bore,stock crank,ported 853 heads, 78mm FAST with ported t/b, should be around 9.8:1 c/r. Auto with 4.11 gears. car dynoed at 410hp and 386 ft. lbs. torque before. Need to upgrade fuel pump and injectors and then I am going to try the t-rex cam because I like the sound, it will either run good or not, we will see!
I came from the side that you have to have everything perfect to make good power (LS1's, you just stare at them and they'll make good power). You almost can't screw them up....except when going FI... A cam that big will make power in a high rpm or big motor. The turbo will compensate for the overlap and overall duration. However, off boost you'll loose efficiency and can be down right doggie in a smaller cube/low compression big turbo set up... I personally like smaller cams in turbo cars when your not trying to go 8's or better. I have a friend that goes 9.7's in a twin turbo older c5 Z06 vette. 13lbs of boost and stock everything. Made like 717 crhp (dynojet) through an auto that he had installed. Food for thought...
To answer your question.... it might be hard to find someone who uses that particular cam in any turbo combo. Most go stock/near stock or have a cam spected to their combo. You could always try it and see if you can handle they way it acts...I say probably not going to like it on a 70-76mm turboed 5.7-6 liter engine unless you have 10 to 1 compression to help compensate off boost.[/QUOTE
Mahle -4cc dished pistons,scat rods,stock bore,stock crank,ported 853 heads, 78mm FAST with ported t/b, should be around 9.8:1 c/r. Auto with 4.11 gears. car dynoed at 410hp and 386 ft. lbs. torque before. Need to upgrade fuel pump and injectors and then I am going to try the t-rex cam because I like the sound, it will either run good or not, we will see!
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04-15-2010, 02:58 PM
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Don't forget to add what turbo you plan to use along with A/R, flange size, piping ect. (in order to get a reasonable response on this site).
I don't mind tighter LSA's on twin turbo set ups. That would be a nice cam for sure in a Blown set up. We have a similar cam I spected out for a 408 F1 combo. First and only pass ran a 9.7 in (4200lbs race weight car). With some tuning and upping the boost 9.3's should be easy. Maybe even 8's if we can get the F1 over 20 psi instead of current 14lbs, and put the car on a diet.
I don't mind tighter LSA's on twin turbo set ups. That would be a nice cam for sure in a Blown set up. We have a similar cam I spected out for a 408 F1 combo. First and only pass ran a 9.7 in (4200lbs race weight car). With some tuning and upping the boost 9.3's should be easy. Maybe even 8's if we can get the F1 over 20 psi instead of current 14lbs, and put the car on a diet.
04-15-2010, 03:01 PM
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Don't forget to add what turbo you plan to use along with A/R, flange size, piping ect. (in order to get a reasonable response on this site).
I don't mind tighter LSA's on twin turbo set ups. That would be a nice cam for sure in a Blown set up. We have a similar cam I spected out for a 408 F1 combo. First and only pass ran a 9.7 in (4200lbs race weight car). With some tuning and upping the boost 9.3's should be easy. Maybe even 8's if we can get the F1 over 20 psi instead of current 14lbs and put the car aon a diet.
I don't mind tighter LSA's on twin turbo set ups. That would be a nice cam for sure in a Blown set up. We have a similar cam I spected out for a 408 F1 combo. First and only pass ran a 9.7 in (4200lbs race weight car). With some tuning and upping the boost 9.3's should be easy. Maybe even 8's if we can get the F1 over 20 psi instead of current 14lbs and put the car aon a diet.
04-15-2010, 04:18 PM
#15
The MPt70 will not have the steam to keep up with the amount of boost lost out the exhaust. Well assuming you are looking for more than 400hp.
I have tuned a car running a trex with an 88mm and it seemed to work well but I don't know about the efficiency of it.
My mp70 was out of steam around 5500rpms / 600rwhp with a little baby cam that still had negative overlap.
I have tuned a car running a trex with an 88mm and it seemed to work well but I don't know about the efficiency of it.
My mp70 was out of steam around 5500rpms / 600rwhp with a little baby cam that still had negative overlap.
04-15-2010, 10:54 PM
#16
Imo the cam and the turbo need to work together, small turbo works best with small duration cam, all that overlap will just push that turbo right past its efficiency range. Im sure it will work but other cams will work better. VA speed and speed Inc both have good off the shelf cams.
04-16-2010, 09:00 AM
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The MPt70 will not have the steam to keep up with the amount of boost lost out the exhaust. Well assuming you are looking for more than 400hp.
I have tuned a car running a trex with an 88mm and it seemed to work well but I don't know about the efficiency of it.
My mp70 was out of steam around 5500rpms / 600rwhp with a little baby cam that still had negative overlap.
I have tuned a car running a trex with an 88mm and it seemed to work well but I don't know about the efficiency of it.
My mp70 was out of steam around 5500rpms / 600rwhp with a little baby cam that still had negative overlap.
04-16-2010, 09:08 AM
#19
Hasn't been on the dyno yet and only got a couple of passes in last year. Was running 116mph in the 1/8th with some issues still. Broken valve guide, crushed lifter, couldn't keep the charge pipe on above 10psi. Motor will hopefully be back together soon and turning the boost up.
04-16-2010, 10:41 AM
#20
While I'll agree that a better cam may have worked even better, the 'too much overlap' Trak cam made good boost everywhere (in fact, we had more boost than we needed as it was a stock bottom end) and made 786 rwhp/700 rwtq at 11.5 psi, on a 346 with AFR 205s as it was running out of fuel system....not bad.
