Why is TQ so inconsistant in FI setups?
Why is TQ so inconsistant in FI setups? Sometimes I see setups with similar matching rwhp and rwtq, and at other times i see 100 or more rwtq then hp.
Is there anything in particular that affects it? maybe certain cam specs bleed of enough pressure to affect hp, but not tq?
Im not sure how its all connected, but its something interesting to examine...
Is there anything in particular that affects it? maybe certain cam specs bleed of enough pressure to affect hp, but not tq?
Im not sure how its all connected, but its something interesting to examine...
Below are three examples that ive taken screen shots of, just off of the top of my head.
granted one of them isnt even an ls1, but still FI is FI, at least i would think so.
granted one of them isnt even an ls1, but still FI is FI, at least i would think so.
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ok for starters forget the 1st pic lets just deal with the LS motors....youre 1st ls motor is a basically stock motor with a small turbo(T66)...then you have brians 427C5R motor at the time that was S/C'd...2 totally different motors purposes builds etc.you need to find 2 people with the same motor or FI setup and and then you could see where the subtle differences could be,such as timing and IATs.
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Originally Posted by ddnspider
silberbullet 455/516 @ 7psi which is pretty good i think.
then brians C5R make 822rwhp forged and all
so 2 different ballparks
then brians C5R make 822rwhp forged and all
so 2 different ballparks
Silberbullet are very good numbers for mods, im just saying i would think they would be within 20+/-.
brians car has like a 70 difference. How big of a role does a stall have to do with tq?
Originally Posted by Armageddon
...lol he's probably referring to mine.
My undersized turbo has a lot to do with it.
My undersized turbo has a lot to do with it.
what size are you using again, the 76gts?
Edit: just saw the post of your gt70 in the for sale section
I think the increase of TQ has to do with few things:
Main thing is back pressure created from Turbo. After that smaller manifold, smaller exhaust duration with lift than intake come to mind. Also the efficieny of the tranny especially in an AUTO. Some Nitrous cases make alot more TQ than a Turbo setup. I have noticed people gain more TQ over their HP with Nitrous when running through a full stock exhaust system which only means more backpressure. The difference between the HP and TQ numbers decreases when they run full exhaust system even though they are still making more power than before. Just my opinion.
Main thing is back pressure created from Turbo. After that smaller manifold, smaller exhaust duration with lift than intake come to mind. Also the efficieny of the tranny especially in an AUTO. Some Nitrous cases make alot more TQ than a Turbo setup. I have noticed people gain more TQ over their HP with Nitrous when running through a full stock exhaust system which only means more backpressure. The difference between the HP and TQ numbers decreases when they run full exhaust system even though they are still making more power than before. Just my opinion.
i wondered the same thing. 99SS-T has the phamspeed t76 w/10 psi made 531rwhp/534rwtq
rob raymer's test car made 534/687 w/ 9psi open exhaust...look at that torque
Tiago made 615rwhp/613rwhq with 10psi (forged bottom end) stock heads & cam
all cars were bone stock everything. robs car had the ls6 intake.
rob raymer's test car made 534/687 w/ 9psi open exhaust...look at that torque
Tiago made 615rwhp/613rwhq with 10psi (forged bottom end) stock heads & cam
all cars were bone stock everything. robs car had the ls6 intake.
Originally Posted by 2000 Tran Zam
Silberbullet are very good numbers for mods, im just saying i would think they would be within 20+/-.
brians car has like a 70 difference. How big of a role does a stall have to do with tq?
brians car has like a 70 difference. How big of a role does a stall have to do with tq?
Originally Posted by 30th t/a
i wondered the same thing. 99SS-T has the phamspeed t76 w/10 psi made 531rwhp/534rwtq
rob raymer's test car made 534/687 w/ 9psi open exhaust...look at that torque
Tiago made 615rwhp/613rwhq with 10psi (forged bottom end) stock heads & cam
all cars were bone stock everything. robs car had the ls6 intake.
rob raymer's test car made 534/687 w/ 9psi open exhaust...look at that torque
Tiago made 615rwhp/613rwhq with 10psi (forged bottom end) stock heads & cam
all cars were bone stock everything. robs car had the ls6 intake.
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Joined: Jul 2004
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From: Hazard Co. Maryland
Originally Posted by 2000 Tran Zam
cant you adjust for that via hp tuners or ls1 edit though?
Yes you can, I was just thinking a simple way to explain how someone has a car tuned in can affect the reading. Both might make the same pq hp, but different pq. tq and that could just be timing differences @ those areas of the map. In reality, there are TONS of reasons why.
robs car makes sense with the open exhaust.Tiagos was a custom setup i believe....the real questions is what exactly does each car have in there setup,im too tired to search...someone else do it an post and we can see the small differences.