de-stroke 454
Race Director
Joined: Aug 2005
Posts: 13,592
Likes: 187
From: Hudson WI
NCM Sinkhole Donor
Le Mans Master
Joined: Aug 2007
Posts: 6,473
Likes: 297
From: Orange Park FL
Robz had his 427 destroked to a 388. He found he had computer problems with going over 8k. He ended up short shifting around 7900 and still ran somewhere near a 9.4 ET....NA
Le Mans Master
Joined: Aug 2007
Posts: 6,473
Likes: 297
From: Orange Park FL
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
Was there a specific reason for wanting rpms ?? Because unless the "entire" car is built for it....it will ultimately be slower. 9 times out of 10...cubes are the answer....especially in a N/A environment.
Thread Starter
Instructor
Joined: Mar 2010
Posts: 123
Likes: 0
i want too shorten my 1/4 mile times. And be a highway monster.
what should i do?
i destroyed a lamborgini on the highway today
not sure how hard that its too do.
Last edited by Z06SlapMopar; Sep 15, 2012 at 09:11 PM. Reason: 5700
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
Not really, my stock lsx 454 Dyno'd 544rwt and 524rwhp. I will try too post the dyno sheet, it has a huge torque curve. and reaches the 524hp @5600rpm.
i want too shorten my 1/4 mile times. And be a highway monster.
what should i do?
i destroyed a lamborgini on the highway today
not sure how hard that its too do.
i want too shorten my 1/4 mile times. And be a highway monster.
what should i do?
i destroyed a lamborgini on the highway today
not sure how hard that its too do.
So you love the tq curve but what less cubes and spin it higher ??
just some questions for ya....
~whats the most rpm that you have seen the Fast style manifold support (esp at your cube.) ??
~what are your thoughts on valvetrain stability and have you priced these items ?
~have you researched the factory ecu and its limitations ??
~do you have an idea about the camshaft that will work in this senario ??
~will your current heads support the cfm required for this ??
~etc..etc....
IMO, there is a reason the GM produced the LSX 454....it is a perfect "street" setup. Killer power down low and 100% streetably with "low" buck parts.
It sounds like you may need to sort out the rest of the car (to keep you in the power through out the pull).
Could you explain what you think the "high" rpm will achieve ??
Or is it wanting more upper hp ??
Also, are you auto or manual ??
Thanks....
Last edited by LSOHOLIC; Sep 15, 2012 at 07:48 PM.
Thread Starter
Instructor
Joined: Mar 2010
Posts: 123
Likes: 0
I cant thankyou enough for taking your time and helping me with this.
(the de-strokeing was mostly curiosity)
Yes, i am looking for more high rpm horsepower.
i think the first step is for me too up grade to the ported fast 102.
now here is where i need some help, so correct me if i'm wrong.
i want faster 1/4 mile times, so the obvious change would be the rear gearing. lets say 3.90's, would this kill my highway action?
Next is caming. if i put in a after market cam it will give me more horse power and less torque. where is this beneficial?
or should i skip the little stuff and throw 5lbs of boost at it?
Thankyou again
(the de-strokeing was mostly curiosity)
Yes, i am looking for more high rpm horsepower.
i think the first step is for me too up grade to the ported fast 102.
now here is where i need some help, so correct me if i'm wrong.
i want faster 1/4 mile times, so the obvious change would be the rear gearing. lets say 3.90's, would this kill my highway action?
Next is caming. if i put in a after market cam it will give me more horse power and less torque. where is this beneficial?
or should i skip the little stuff and throw 5lbs of boost at it?
Thankyou again
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
what does your car weigh ?? Where does it fall off (RPM) ?? What do you shift at ?? What rpm does it make max hp and tq ??
Thanks...............although you have no said this....sounds like you want more topend pull ?? with your driving style, is the 500+tq useable ??
.
Thanks...............although you have no said this....sounds like you want more topend pull ?? with your driving style, is the 500+tq useable ??
.
Thread Starter
Instructor
Joined: Mar 2010
Posts: 123
Likes: 0
what does your car weigh ?? Where does it fall off (RPM) ?? What do you shift at ?? What rpm does it make max hp and tq ??
Thanks...............although you have no said this....sounds like you want more topend pull ?? with your driving style, is the 500+tq useable ??
.
Thanks...............although you have no said this....sounds like you want more topend pull ?? with your driving style, is the 500+tq useable ??
.
i have a 08 base c6 coupe. i think it weighs 3200lbs but i think the lsx is 150lbs heavier so 3350lbs.
RPM
i ONLY dyno'd my car too 6,100rpm
Max HP 524 @ 5,700
Max TQ 544 @ 4,500
from 5,700 - 6,100 horsepower is on a slight down slant, only enough too drop HP to 519 @ 6,100.
After 6100 i'm not sure, i assume it falls off harder somewhere soon.
SHIFT
i,m shifting at 6,500rpm.
my rev limiter is set at 7,000.
IS 500TQ USEABLE
I'm not sure what you mean by this but i have 2 general ideas.
1st idea is that i'm not afraid to Downshift, instead of letting the RPMs build?
2nd idea is that your asking me "if i don't have a need for towing capacity or to get a very Heavy vehicle moving, then do i even need 500+TQ?"
MORE INFO
Right now the car spins first gear.(unless i roll the throttle like a gentelman)
second gear only spins towards the top.
Third through Sixth is smooth sailing.
Thank you again, SlapMopar.
Burning Brakes
Joined: Nov 2009
Posts: 1,114
Likes: 42
From: California
Shorter stroke, in this case anyway, generally means better horsepower and better acceleration. Just keep in mind, the monster midrange you have now would diminish.
Just make sure if you decide to go the short stroke route, you have everything to support the higher revs:
Higher flowing heads, bigger cam, proper intake manifold, and strong/lightweight valvetrain. And of course, rods and pistons made for the piston speed your looking to run.
Just make sure if you decide to go the short stroke route, you have everything to support the higher revs:
Higher flowing heads, bigger cam, proper intake manifold, and strong/lightweight valvetrain. And of course, rods and pistons made for the piston speed your looking to run.
Safety Car
Joined: Oct 2006
Posts: 3,602
Likes: 3
From: Cincinnati OH
I'd look at opening up the intake first, gears second, and weight reduction (of the car) If that's not enough - sell it and start from scratch, which is basically what you're trying to do.
Melting Slicks
Joined: Nov 2009
Posts: 2,536
Likes: 15
Hey Mr ZO6slapmopar......how well does your tq curve hang on past peak tq ?? Is it a table top or does it fall off quickly after peak tq ??
When you shift at 6500rpm....does it feel like it noses over...or is it still pulling ??
If your still interested in more rpm.....there are a few thing to look into that would help you now and later if you decide to spin it harder. So...as you know some of the first things would be more air and rpm stability. Aka; valvesprings, valves (lighter), lightened rockers, rigid pushrods, better breathing manifold & TB. Now you many already have some of this stuff or know the specifics about your combo. But either way, these items will net a return on your current setup and a future raise of the rpm. The two biggest things that would effect you moving the rpm up a little would be camshaft and manifold.
Thanks.....just fyi, the flater and higher you make peak tq the faster your car will be. The most combustions down the track wins !!....LOL
When you shift at 6500rpm....does it feel like it noses over...or is it still pulling ??
If your still interested in more rpm.....there are a few thing to look into that would help you now and later if you decide to spin it harder. So...as you know some of the first things would be more air and rpm stability. Aka; valvesprings, valves (lighter), lightened rockers, rigid pushrods, better breathing manifold & TB. Now you many already have some of this stuff or know the specifics about your combo. But either way, these items will net a return on your current setup and a future raise of the rpm. The two biggest things that would effect you moving the rpm up a little would be camshaft and manifold.
Thanks.....just fyi, the flater and higher you make peak tq the faster your car will be. The most combustions down the track wins !!....LOL
Le Mans Master
Joined: Nov 2003
Posts: 8,308
Likes: 157
From: NJ