Lt1 350 torque monster
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From: Denver Colorado
Lt1 350 torque monster
Has anyone picked up the December issue of VETTE magazine? I'm asking because they did a tech article on an LT1 making it more torquy? (I guess that's how it would be spelled), basically they had 1 5/8 LT with 3" collectors, 1.6 rollers, comp cam XE264Hr-12 (212/218 duration, split at .050 and 112 degree lope), AFR 195 heads (plus porting), and a SuperRam intake with a 1,00cfm throttle body, 36lb injectors. Htey ended up making 420 hp and 460 lbs of torque. 450 lbs between 3700 - 4600 rpm and over 400 between 3000 - 5500 rpm. Of course this is all on an engine dyno where the stock motor dynoed at 363 hp at 5300 rpm and 390 at 4100rpm. What do you guys think?
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From: Denver Colorado
So after thinking about this, to the wheels stock LT1 gets 250hp and 285 lbs torque?
Then if my math is close, after this work you end up with 310 hp and 350lbs of torque to the road?
Is this good for how much money you would spend? Because you're probably looking at close to 6k before intallation.
Then if my math is close, after this work you end up with 310 hp and 350lbs of torque to the road?
Is this good for how much money you would spend? Because you're probably looking at close to 6k before intallation.
Race Director
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There goes the Super Ram set up shining for that Fat torque curve.I doubt it would have this torque if it had an LT1 intake manifold.The SR was first designed to improve the modded L98 and they made a kit for the LT1 as well.
However,Im sure with those engine mods,if the motor had a ported LT1 intake,it may not have had as much torque but it would have higher HP.
I didnt see the magazine so do not know if they did the two intake set ups and compared the two.Either way,sounds like a blast to drive!
However,Im sure with those engine mods,if the motor had a ported LT1 intake,it may not have had as much torque but it would have higher HP.
I didnt see the magazine so do not know if they did the two intake set ups and compared the two.Either way,sounds like a blast to drive!
Safety Car
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From: Charleston SC
Originally Posted by cuisinartvette
That is an awful nice torque curve for a little 350! Them's stroker #'s.
Close but not quite. Those are FW #s so take off for divetrain loss and they are considerably less at the rear wheels. I had a miss the day I dynoed but I still made right at 400 RWTQ from 3700-5200 and never droped bellow 330 #s.
I would like to see Nathans dyno sheet in compairison to the SR set up. I don't think Nathans would reach 460 FW but then again a stock motor is not going to make 363 FWHP so the dyno used was a very "nice" dyno.
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they were using a Superflow engine dyno as I mentioned is just the engine no accessories or anything so that will free up some power, so what I did was take that 363 compared to the 300 hp rating and a driveline loss to get the 250/290 stock compared to the 310/350 RW of the project, I didn't get real complicated with tthe number though
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Le Mans Master
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From: Greenville SC
I started the same thread a few weeks back. Some more details here:
http://forums.corvetteforum.com/show...52&forum_id=48
http://forums.corvetteforum.com/show...52&forum_id=48
Drifting
Joined: May 2003
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From: Charlotte NC
St. Jude Donor '05
Originally Posted by BRICHC4
they were using a Superflow engine dyno as I mentioned is just the engine no accessories or anything so that will free up some power, so what I did was take that 363 compared to the 300 hp rating and a driveline loss to get the 250/290 stock compared to the 310/350 RW of the project, I didn't get real complicated with tthe number though
I have found from a engine dyno to a chassis dyno around 22% drivetrain loss is normal in a manual
alternator, waterpump, full exhaust, and drivetrain eat up more than you would think.
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From: Denver Colorado
Originally Posted by 95wht6spd
I started the same thread a few weeks back. Some more details here:
http://forums.corvetteforum.com/show...52&forum_id=48
http://forums.corvetteforum.com/show...52&forum_id=48
Le Mans Master
Joined: Jul 2000
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From: Greenville SC
THis link had a comparable build-up on it.
http://www.geocities.com/MotorCity/7610/dyno.htm
I think the real question is, is the SR worth the extra $ to get more TQ and lose some HP on the very high end?
http://www.geocities.com/MotorCity/7610/dyno.htm
I think the real question is, is the SR worth the extra $ to get more TQ and lose some HP on the very high end?
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From: Denver Colorado
I think what others have said is that the superram gives that long broad torque curve, The dyno test on there showed 468 max torque at 4000 rpm and above 400 from 3000 -5500 where you hit the max hp. The posted dyno curve is exactly the same as the one in the catalog, just is it on a chassis dyno though? On the other hand there is a local guy on the forum boulderLT4 who just got a 383 built and with a ported lt4 intake pretty much has the same torque curve with the max of 404, but I don't think it was tuned all the way. To answer the question of loosing hp it seems that the peak is just a touch shorter but still reacing that at 5500 rpm, which is where you'll probably shift anyway.
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From: Everett WA
C4 of Year Finalist (appearance mods) 2019
Originally Posted by BRICHC4
Is this good for how much money you would spend? Because you're probably looking at close to 6k before intallation.
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From: Denver Colorado
Originally Posted by Mr. Peabody
Hmmm for $6K prior to installation I wonder if you'd be better off with a Greg Carroll supercharged kit?
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From: Denver Colorado
Originally Posted by C4Jimmy
This might sound stupid, but will that Intake fit under the hood?
It looks so tall in the magazine pics!!!
It looks so tall in the magazine pics!!!
Drifting
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From: Charlotte NC
St. Jude Donor '05
IMHO
The Superram is a great choice for a L98 guy.. but there is absoulutely nothing lacking from a LT1's torque curve from heavily modified to stock. Notice the broad torque curve in this little collection of LT1 dynosheets.
http://www.pcmforless.com/images/dyn...no%20tuned.JPG
http://mywebpages.comcast.net/bherte...argedVette.JPG
http://www.pcmforless.com/images/dyn...yno%20tune.jpg
http://www.pcmforless.com/images/alv...AE10.15.05.jpg
http://www.pcmforless.com/images/pcm...smailorder.jpg
Theres no way in hell I would put a superram on a LT1.. LT1's are torque monsters from the factory with the ability to pull to 6500rpm with the right heads/cam.
The Superram is a great choice for a L98 guy.. but there is absoulutely nothing lacking from a LT1's torque curve from heavily modified to stock. Notice the broad torque curve in this little collection of LT1 dynosheets.
http://www.pcmforless.com/images/dyn...no%20tuned.JPG
http://mywebpages.comcast.net/bherte...argedVette.JPG
http://www.pcmforless.com/images/dyn...yno%20tune.jpg
http://www.pcmforless.com/images/alv...AE10.15.05.jpg
http://www.pcmforless.com/images/pcm...smailorder.jpg
Theres no way in hell I would put a superram on a LT1.. LT1's are torque monsters from the factory with the ability to pull to 6500rpm with the right heads/cam.
Last edited by Alvin; Oct 22, 2005 at 10:43 PM.
Safety Car
Joined: Dec 2002
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From: Charleston SC
Originally Posted by BRICHC4
I think what others have said is that the superram gives that long broad torque curve, The dyno test on there showed 468 max torque at 4000 rpm and above 400 from 3000 -5500 where you hit the max hp. The posted dyno curve is exactly the same as the one in the catalog, just is it on a chassis dyno though? On the other hand there is a local guy on the forum boulderLT4 who just got a 383 built and with a ported lt4 intake pretty much has the same torque curve with the max of 404, but I don't think it was tuned all the way. To answer the question of loosing hp it seems that the peak is just a touch shorter but still reacing that at 5500 rpm, which is where you'll probably shift anyway.
I realy was considering the SR when I was building my 383 but decided the added cubes would give plenty of TQ and in the end I was happy with the TQ curve keeping the LT1 intake (LT4 actualy). Now I would think if someone with stock displacment LT1 was looking to add a broader TQ curve and was willing to give up a little top end the the SR would still be a great choice.
