TREX Cam Need Help Please!
12-17-2010, 01:04 AM
#1
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TREX Cam Need Help Please! I Have just installed the Trex cam on my 02 Z06 I have stock 243 heads (untouched) with stock LS6 intake with full bolt ons and 42lbs injectors (maxed the stock ones out at 440). But I just got the car tuned at Quality Motorsports in Lewisville Texas but I was told that b/c the cam is so big that it will not idle correctly surges a lot acts like it wants to die and bucks a lot under 2k rpms. The car put down 462RWHP and 400RWTQ and was very surprised and happy. So I have not drove it since I got it back 3 days ago but fired it up tonight to take my girl to the mall to get some gifts, and it just drove like complete ***. It was 40 degrees out but I let it warm up and still it drove like crap. Car was street tuned and dynoed tuned fyi.
So my question is do any of you know from experience that can these big cams be tuned to drive fine or will it always run like crap or they just feeding me bullshit?
And here is the specs on the cam
242/248 - .608/.612 - 110 lsa
Thanks NoTraction
So my question is do any of you know from experience that can these big cams be tuned to drive fine or will it always run like crap or they just feeding me bullshit?
And here is the specs on the cam
242/248 - .608/.612 - 110 lsa
Thanks NoTraction
Last edited by NoTractionZ06; 12-17-2010 at 01:25 AM.
12-17-2010, 01:55 AM
#2
Get a different tuner.
My friend tunes LSX cars and has done several cams like this ...also locally, New Era up in Rochester tuned my friends 03' vette with the T rex cam and it has excellent street manners. It just takes some time and some experience.
My friend tunes LSX cars and has done several cams like this ...also locally, New Era up in Rochester tuned my friends 03' vette with the T rex cam and it has excellent street manners. It just takes some time and some experience.
12-17-2010, 04:33 AM
#7
Yeah I run a ms4 in my m6,and my car drives fine,on stock gears I had very,very lil bucking at low rpms,which pretty much was all fixed with a bigger gear,I know the t rex is a lot bigger cam than a ms4 but I think you need a new tune,my car had over 3 hours on the dyno and about 2 on the street,and lil adjustments here and there,where are you located around? Maybe we can point you in the direction of a tuner that can fix your issues,how was it acting when you drove it?I'm taking a guess it was all in the lower rpms?or did it drive better when you were above 40 mph?or did it just run bad all over?
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12-17-2010, 04:47 AM
#9
Jt76 seems like he can point you in the right direction,but I would call the place who tuned it and just say that if you take the car somewhere else and they can get it fixed can you get your money back?hey its worth a shot,sorry I missed that you put your location up there,a good tune should fix everything,good luck man and God bless you,
12-17-2010, 07:20 AM
#10
Bucking below 2K is about right for a 240+ duration cam on a stock geared Corvette. A lot of internet fan boys of these huge cams will tell you "mine drives great" but that's mainly because they're either delusional out of being excited just to have a cam in their car or they just don't know any better.
It's hard to say how much better a different tuner can make it drive since I can't see your tune, but I can tell you that 240+ degrees of duration on stock gearing is going to generate some buck/surge in the low rpm's regardless of who's tuning it.
One other possible thing is they could have not scaled the injectors properly, which will effect driveability as well. If the injectors are scaled wrong, it'll throw off the trims and WOT fueling. I've seen shops monkey **** their way around it by manipulating other tables to get their desired A/F, but it causes bad gas mileage/driveability.
It's hard to say how much better a different tuner can make it drive since I can't see your tune, but I can tell you that 240+ degrees of duration on stock gearing is going to generate some buck/surge in the low rpm's regardless of who's tuning it.
One other possible thing is they could have not scaled the injectors properly, which will effect driveability as well. If the injectors are scaled wrong, it'll throw off the trims and WOT fueling. I've seen shops monkey **** their way around it by manipulating other tables to get their desired A/F, but it causes bad gas mileage/driveability.
12-17-2010, 01:56 PM
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Well I am located in Fort Worth and I have 390 gears threw the m12 transmission (sorry forgot to mention that) but I have have had a lot of other people go to this shop with zero issue guess I just lucked out.
12-17-2010, 03:30 PM
#14
He is feeding you bull, he probably doesn't want to spend the time required to tune it. These cams can be tuned well otherwise they wouldn't sell as well as they do. I've got one in my '99 that I tuned and it runs just fine. The TRex just takes a little extra patience and experience to tune well.
Keep in mind though, as Damian said, some low RPM surge is to be expected with such a large duration cam, this cam definitely wasn't designed for the daily driven application
I advise trying to find someone in your area with a cammed LSX motor and go for a ride with them to see if any low RPM surge they have is similar to what you have.
Good luck!
Keep in mind though, as Damian said, some low RPM surge is to be expected with such a large duration cam, this cam definitely wasn't designed for the daily driven application
I advise trying to find someone in your area with a cammed LSX motor and go for a ride with them to see if any low RPM surge they have is similar to what you have.
Good luck!
12-17-2010, 03:43 PM
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how bad is it. is the engine stalling. take a video because there is no way to gauge acceptable on the internet
Last edited by disc0monkey; 12-17-2010 at 03:48 PM.
12-17-2010, 03:54 PM
#16
Talk to the man who built that cam, Geoff@EPS. He could help your tuner tune that cam.
He helped a friend of mine in another state get his truck tuned by talking to the other tuner and the truck runs perfectly with a cam similar to the trex but just a lil smaller.
He helped a friend of mine in another state get his truck tuned by talking to the other tuner and the truck runs perfectly with a cam similar to the trex but just a lil smaller.
12-17-2010, 06:19 PM
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My and my buddy just went out to log it. Died a lot and just would not run for crap, the fuel trim is -31% for both banks on the short termside.
And the maf is not reading to well so I am gonna clean it up and see if that helps.
Well my dumbass cannot seem to figure out how to upload on of the logs we did. Using excel to look at it. If someone could chime in to help me upload it correctly that would be great.
And the maf is not reading to well so I am gonna clean it up and see if that helps.
Well my dumbass cannot seem to figure out how to upload on of the logs we did. Using excel to look at it. If someone could chime in to help me upload it correctly that would be great.
12-17-2010, 07:07 PM
#20
3.90s are better than stock but that's low imho for running a t rex,I run 4.10s in my ms4 and in the process of putting in 4.30s,damien is right though,my car does drive well but had some bucking ,surging on stock gears it was real light but it was there,the 4.10s made the cam,4.30s my car should fly,big cams make all there power up top,higher gears will help you keep it in the power range,can I ask you why you went with the t rex?