1011 hp LS7 Can Am
Discussion
tuxman said:
looks awsome but what gearbox is fitted and how in hell is it going to cope with all that torque !!!!
Don't expect an answer Simon, third post down I asked the same question but as yet have not had a reply. Maybe it is top secret? At least with forced induction it is a little easier on the transmission than big power N/A.
deadscoob said:
I'd have thought with the extra torque from forced induction it'd struggle more, not less.
It is kinder on the transmission because of the progression in application and the fact that that the vehicle is already moving.
A bit of a poor analagy but imagine an arm wrestler applying maximum strength before his opponant had taken the strain, and the possibility that he may at least strain the opponants arm if not break it!
If on the other hand ( no pun intended ), the wrestlers advessary takes the strain before the battle commences, little strain or breakage is likely to occur although the same amount of strength is being applied
if you guys are talking about hard launching than you have to remember that a turbo motor will not make all its torque with no load on the engine. it takes a fraction of a second to laod the turbos and for them to spool before you get all the power. hopefully by that time the cars is starting to move!
you will notice this effect if you watch the boost gauge on a turbo car. you can sit there all day reving the b*lls of the thing and you wont get 24psi (asumong thats what you normaly run) of boost.
this isnt't the same with a N/A motor. you still need to apply some load but the power is instantly there.
as for the box, if its a 5 speed out the 993turbo/GT2 then i think powerhouse could make a box strong enough. stock turbo box's can tkae 700lbsft in a 911. also they use something like 30% stronger gears! just what i have heard mind you. lol
Chris.
you will notice this effect if you watch the boost gauge on a turbo car. you can sit there all day reving the b*lls of the thing and you wont get 24psi (asumong thats what you normaly run) of boost.
this isnt't the same with a N/A motor. you still need to apply some load but the power is instantly there.
as for the box, if its a 5 speed out the 993turbo/GT2 then i think powerhouse could make a box strong enough. stock turbo box's can tkae 700lbsft in a 911. also they use something like 30% stronger gears! just what i have heard mind you. lol
Chris.
Posted a short video to PHTV. Should be up soon.
On the trans issue, a major factor is getting the power to the ground. The arm wrestling concept is reasonable, but consider that the weaker arm could go all the way around without breaking...around and around. When there's little resistance at the joint (if you will), the arm wouldn't break.
Since the Ultima is relatively light, much of the strain is reduced. At 17 lbs. of boost, this engine delivers (over) 800 lb/ft to 345-wide 19" R-compound Hoosiers. So, it's going to get some traction. Still has to be a tough box. I think the engine made something like 500 lb/ft at 2,500 RPM!
It would not surprise me to learn that the trans was built by California Motorsports.
On the trans issue, a major factor is getting the power to the ground. The arm wrestling concept is reasonable, but consider that the weaker arm could go all the way around without breaking...around and around. When there's little resistance at the joint (if you will), the arm wouldn't break.
Since the Ultima is relatively light, much of the strain is reduced. At 17 lbs. of boost, this engine delivers (over) 800 lb/ft to 345-wide 19" R-compound Hoosiers. So, it's going to get some traction. Still has to be a tough box. I think the engine made something like 500 lb/ft at 2,500 RPM!
It would not surprise me to learn that the trans was built by California Motorsports.
chuntington101 said:
17psi of boost!!! man thats a lot of boost for a 7.0ltr engine. would have thought thoes figures would have been higher running that kinda boost. are the heads worked at all?????
thanks Chris.
Don't know. Maybe a little. Of course, the compression is lowered and forged pistons installed...non-boosted power lower than the original LS7. So, it's not as close to the gains seen by dropping boost on a non-modified setup. thanks Chris.
gtrclive said:
Same video. Posted yesterday, but it's not on PHTV yet. builder said:
chuntington101 said:
17psi of boost!!! man thats a lot of boost for a 7.0ltr engine. would have thought thoes figures would have been higher running that kinda boost. are the heads worked at all?????
thanks Chris.
Don't know. Maybe a little. Of course, the compression is lowered and forged pistons installed...non-boosted power lower than the original LS7. So, it's not as close to the gains seen by dropping boost on a non-modified setup. thanks Chris.
Well, look at it this way. If you tried to run the same boost on stock pistons(which has very high compression), it would most likely blow the motor completely to high heaven. I wouldn't compare this engine to the original stock LS7 motor, it is a completely different setup. What is the compression ratio on the rebuilt LS7? 8.5 to 1?
builder and ULTIMALOVER i was not having a go at this egnine. its a magnificent piece of kit. i was just saying, i have heard of 427 LS engines that are making that kind of power on less boost. but having said that most of the HP number i hear about are on chassis dynos and thats a whole nother thing. also these "others" that are making more are in front mounts where the piping and intercooler might be a tad more efficent.
by the way jeff, what the presure drop across the intercooler? also how about the diffrence between turbo and maifold (your taking in to acount the whole system if you do it that way for thoes that dont know! )
thanks again Chris.
by the way jeff, what the presure drop across the intercooler? also how about the diffrence between turbo and maifold (your taking in to acount the whole system if you do it that way for thoes that dont know!
) thanks again Chris.
Chris......
I have a test for you
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I'll bet you get top marks.
I have a test for you
www.okcupid.com/tests/take?testid=13681635242338607836
I'll bet you get top marks.
Builder said:
ULTIMALOVER said:
What is the compression ratio on the rebuilt LS7? 8.5 to 1?
Yup, you know it's in 8s.chuntington101 said:
builder and ULTIMALOVER i was not having a go at this egnine.
Didn't think so, and you better not be! Evening Scott, Chris wouldn't have been having a pop, lol. Anyway, I'm assembling an engine also in the 8's but it's using GT 37's and Tial wastegates, still has stock heads though. It's using a different intake and cast headers. Will be good to see how it compares with Jeffs. I expect similar power which will be nice but that's some way off. I'll post a dyno sheet for comparison when I get it.
Boosted.
Boosted Ls1 said:
Evening Scott, Chris wouldn't have been having a pop, lol. Anyway, I'm assembling an engine also in the 8's but it's using GT 37's and Tial wastegates, still has stock heads though. It's using a different intake and cast headers. Will be good to see how it compares with Jeffs. I expect similar power which will be nice but that's some way off. I'll post a dyno sheet for comparison when I get it.
Boosted.
Ha-ha...I never thought so... If so, didn't mean for the reply to sound harsh. Chris, you love Ultimas, so you know I love you bro... Boosted.
That's great! It will be interesting to see the numbers using some of your parts. Guessing you will be using one of your intakes? What else?
builder said:
Boosted Ls1 said:
Evening Scott, Chris wouldn't have been having a pop, lol. Anyway, I'm assembling an engine also in the 8's but it's using GT 37's and Tial wastegates, still has stock heads though. It's using a different intake and cast headers. Will be good to see how it compares with Jeffs. I expect similar power which will be nice but that's some way off. I'll post a dyno sheet for comparison when I get it.
Boosted.
Ha-ha...I never thought so... If so, didn't mean for the reply to sound harsh. Chris, you love Ultimas, so you know I love you bro... Boosted.
That's great! It will be interesting to see the numbers using some of your parts. Guessing you will be using one of your intakes? What else?
awwwwww thanks builder.
nice to see the love on this forum every now and agian.
sorry crafty internet is playing up here and couldn't have at it
what was it about??? Bloosted, do you run your chargcooler intakes on you turbo'ed LS1s as well as an intercooler?
thanks Chris.
builder said:
Boosted Ls1 said:
Evening Scott, Chris wouldn't have been having a pop, lol. Anyway, I'm assembling an engine also in the 8's but it's using GT 37's and Tial wastegates, still has stock heads though. It's using a different intake and cast headers. Will be good to see how it compares with Jeffs. I expect similar power which will be nice but that's some way off. I'll post a dyno sheet for comparison when I get it.
Boosted.
Ha-ha...I never thought so... If so, didn't mean for the reply to sound harsh. Chris, you love Ultimas, so you know I love you bro... Boosted.
That's great! It will be interesting to see the numbers using some of your parts. Guessing you will be using one of your intakes? What else?
Yes, my twin throttle intake with copper chargecoolers and 8 port water injection inside. Billet ti rods, callies crank and some very slippery coated pistons. I'm keeping the stock heads but they've had heat treatments. The owner wants 16 injectors so I'll do that, it's his choice after all. Personally I'd prefer 8
It's using a remapped ecu and twin MAF's afaik. I'm at the balancing stage so the build won't be far away. Installation and chassis work is being done elsewhere so it could be sometime before it runs. Boosted.
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