Got my car tuned today with the small combo. Dyno results also.
05-11-2004, 06:34 PM
#1
Got my car tuned today with the small combo. Dyno results also. I took my car to MTI where Jayson tuned it he did an awsome job. I ran out of fuel up top @5300 or so but it still made 575 rwhp and 520 rwtq. I am going to change the fuel system and go back for a retune. It was heading for 600 when it ran out of fuel. My set up is 6.0L heads, cam, and a 2.65" pulley on my G-trim Vortech with 50lb injectors LT, ory, with a corsa I am a 6spd with 3:73's. I am pleased I will be back for a retune after I fix my fuel problem.
Last edited by Inspector12; 05-11-2004 at 06:41 PM.
05-11-2004, 06:44 PM
#2
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Very impressive!
Can you give some more details about the camshaft?
Also, do you still have a 10-bolt rear end with stock driveshaft. Can you post a dyno graph as well?
Cheers!
Can you give some more details about the camshaft?
Also, do you still have a 10-bolt rear end with stock driveshaft. Can you post a dyno graph as well?
Cheers!
05-11-2004, 06:48 PM
#3
Yeah I still am running the stock 10 bolt with 3:73's and Stock drive shaft. The cam is one I came up with after looking at what everyone was offering for blowers ETC... 224/581 230/591 114. Sounds like a 224/224 cam I think it was CAL that said it would and he is right. I don't have a scanner to post the dyno sheet but I will call MTI and see if they can email it to me so I can post it for you guys.
05-11-2004, 07:02 PM
#4
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Very interesting indeed!
I hope all the other ATI/Vortech guys are paying attention to this post.
It seems that the supercharged 346ci LS1's are in fact responding well to "big" camshafts, provided the LSA is at 114 or higher, EVEN if the RPMs are not brought way up to what the advertised max RPM is for the cam. This is good info. In lieu of this, I might try swapping to that cam before I decide to upgrade to the T-Trim.
Thanks for the info Inspector. Let me know if you need somewhere to host the dyno graph. I'll be more than happy to host it on my site.
I hope all the other ATI/Vortech guys are paying attention to this post.
It seems that the supercharged 346ci LS1's are in fact responding well to "big" camshafts, provided the LSA is at 114 or higher, EVEN if the RPMs are not brought way up to what the advertised max RPM is for the cam. This is good info. In lieu of this, I might try swapping to that cam before I decide to upgrade to the T-Trim.
Thanks for the info Inspector. Let me know if you need somewhere to host the dyno graph. I'll be more than happy to host it on my site.
05-11-2004, 09:33 PM
#6
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what do you mean u r running out of fuel?
running out of fuel pressure? (ie fuel flow)
or
are the injectors maxed out?
what fuel rails do you have? stock?
what fuel pump(s) are you using? inline? single-intank? dual intank?
running out of fuel pressure? (ie fuel flow)
or
are the injectors maxed out?
what fuel rails do you have? stock?
what fuel pump(s) are you using? inline? single-intank? dual intank?
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05-11-2004, 09:56 PM
#8
It runs very well no surging at all. It has an intimidating sound and if you look under the hood I think some would just give up just because it looks impressive.Yeah The T-rex is not keeping up it droped almost 20lbs. So I am going to try what Jayson suggested. and go back for a retune.
05-12-2004, 10:20 PM
#10
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big as in lift is ok for blower cam you still want to maintain a 114 lobe separation, personally for me since my car is primarily driven on the street i'd go with a 220/224 cam with .560 ish lift
great numbers, be careful you are pushing the limits on the stock bottom end now. even with tuning you can have mechanical failure.
i'm sure you with bigger injectors he'll be fine, i'm sure he's at 90-100% duty cycle on his injectors.
get that graph up.
great numbers, be careful you are pushing the limits on the stock bottom end now. even with tuning you can have mechanical failure.
i'm sure you with bigger injectors he'll be fine, i'm sure he's at 90-100% duty cycle on his injectors.
get that graph up.
05-13-2004, 10:01 AM
#11
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How about doing a bigger intank and then a voltage blaster? Seems like combo worked well for a number of folks.
Your numbers are very strong.
I know that some cam grinders cringe at how we phrase some of our comments to do with lobe separation, so I'll just add that "Reducing the overlap at .050 for the LS1 motors seems to work great, seems like the less overlap you have the better. When you look at the possiblities, and look to keep the overlap down to 2-3 degrees, you end up with 114-116 LSA's. Reducing overlap for FI keeps the cylinder pressure up and limits how much of the intake mixture we blow out the exhaust."
Your numbers are very strong.
I know that some cam grinders cringe at how we phrase some of our comments to do with lobe separation, so I'll just add that "Reducing the overlap at .050 for the LS1 motors seems to work great, seems like the less overlap you have the better. When you look at the possiblities, and look to keep the overlap down to 2-3 degrees, you end up with 114-116 LSA's. Reducing overlap for FI keeps the cylinder pressure up and limits how much of the intake mixture we blow out the exhaust."
05-13-2004, 06:15 PM
#12
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good intital #'s inspector. I too went with a 224-230 cam but im on a 115 + 5 and I will be running the 2.5 pulley. (I had to get rid of my EWP to do it) You might as well go all out on the fuel system. I too was dropping fuel pressure big time. If you want a list of parts to do a complete fuel system drop me a PM.
05-14-2004, 07:37 PM
#13
Thanks guys! I am just starting on it. I dought I am at the limits of my bottom end. Who knows? I might try the 2.5" pulley, but I am going to fix my fuel problem first. And retune before I do that. I am a little afraid of over spinning the blower with the 2.5". What does everyone think about that? Jayson at MTI said they have had a few GRENADE on them? I do drive my car on the street (Weekends ETC...) and it is a very streetable cam. Runs perfect! Like a 224/224 cam on a regular bolt on car A/C and all.
05-14-2004, 09:18 PM
#14
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I think I was one of the first to run a 2.5 pulley on a G-trim and it's been holding up fine for quite a while now.Tight as new and no issues.
I would advice a good bypass valve that can pass a large volume of air. Not some dinky unit that just makes noise. I use a Mondo.
I've been around this ls1 scene since very early 98. I remember well when the Vortech kit was first released. Several of the first GEN g-trims with SQ gears were blowing up left and right. The usual fix from Vortech was to replace with a straight cut geared unit.
I use a HD straight cut geared G-trim. Very few of those have had any troubles.
Although the SQ problem may well have been fixed now. Don't know. But be advised a 2.5" pulley puts this Unit into some serious rpms. If it blows don't blame anybody. It's just the nature of pushing parts to the limits.
I have had mine beyond 70,000rpm so many times I can't even keep track. But that's Just Me.
Steve
I would advice a good bypass valve that can pass a large volume of air. Not some dinky unit that just makes noise. I use a Mondo.
I've been around this ls1 scene since very early 98. I remember well when the Vortech kit was first released. Several of the first GEN g-trims with SQ gears were blowing up left and right. The usual fix from Vortech was to replace with a straight cut geared unit.
I use a HD straight cut geared G-trim. Very few of those have had any troubles.
Although the SQ problem may well have been fixed now. Don't know. But be advised a 2.5" pulley puts this Unit into some serious rpms. If it blows don't blame anybody. It's just the nature of pushing parts to the limits.
I have had mine beyond 70,000rpm so many times I can't even keep track. But that's Just Me.
Steve
05-14-2004, 09:29 PM
#15
Yeah I am aware of the penaltiy for pushing parts to the limit. I was just tring to get some anwers as to how many people are running a 2.5" pulley with the SQ gears that come with the standard kit from Vortech. And how many have had problems ETC... How difficult is it to get the gears replaced with the strait cut gears? Or is it more cost effective to move to a T-trim first?
05-14-2004, 10:30 PM
#16
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Sorry, didn't mean to preach.
Did you order a SQ unit? I am pretty sure they fixed the problems with the SQ trim. I am pretty sure when the units were failing, they pulled them and only offered the Straight cut units for a while. Then they fixed the problem and began offering them(SQ's) again. I have not heard of any G-trims failing in a while either SQ or straight cuts. A LS1 vendor like Tom Byrne who deals with Vortech often would Know better than I on recent issues.
I just don't want to tell people to try a 2.5" pulley without them knowing it is really pushing the limits.
I have had great results with a 2.5 pulley along with some serious re-working of the plumbing.
But a YS or YSI trim sure would be nice. If that's in your budget I would pass right by a T-trim.
But if your drag racing, make sure your car is making use of all the power first.
No reason a maxed G-trim and a very serious drag chassis combo can't run low 10's to high 9's.
Steve
Did you order a SQ unit? I am pretty sure they fixed the problems with the SQ trim. I am pretty sure when the units were failing, they pulled them and only offered the Straight cut units for a while. Then they fixed the problem and began offering them(SQ's) again. I have not heard of any G-trims failing in a while either SQ or straight cuts. A LS1 vendor like Tom Byrne who deals with Vortech often would Know better than I on recent issues.
I just don't want to tell people to try a 2.5" pulley without them knowing it is really pushing the limits.
I have had great results with a 2.5 pulley along with some serious re-working of the plumbing.
But a YS or YSI trim sure would be nice. If that's in your budget I would pass right by a T-trim.
But if your drag racing, make sure your car is making use of all the power first.
No reason a maxed G-trim and a very serious drag chassis combo can't run low 10's to high 9's.
Steve
05-14-2004, 11:13 PM
#17
Thanks I appreciate the warning. I was not trying to sound like I know already just to say I was aware of what could happen if it failed ETC... I am probably going to call Tom and ask him about the failers ETC... Thanks again.
Jeff
Jeff
05-16-2004, 01:31 PM
#20