Ls6 manifold or fast 92mm manifold
What cam spec's?
What cylinder heads?
The LS6 worst weakness is the 78mm TB. The Fast 90/92 will make more hp. Depending on the tuners skill the Fast may not be drive quite as well as the LS6.
The LS6 with a 90mm snout works very well. TPiS can do the mod. Dorman coming LS2 with 92mm TB opening could also be a contender.
What cylinder heads?
The LS6 worst weakness is the 78mm TB. The Fast 90/92 will make more hp. Depending on the tuners skill the Fast may not be drive quite as well as the LS6.
The LS6 with a 90mm snout works very well. TPiS can do the mod. Dorman coming LS2 with 92mm TB opening could also be a contender.
This is not really a correct way of thinking about it. There is rarely a HP number line drawn in the sand for which an intake or exhaust are "good for". There are guys making 450+rwhp with the LS6 intake...but that doesn't mean they aren't leaving a lot on the table by doing so.
Even on a stock engine the Fast intake will make more peak power. 8-12rwhp seems to be a good expectation for a bolt on LS1.
Depending on cam and heads and displacement it will make progressively more over the LS6 as the LS6 becomes a more significant airflow obstruction. In some applications this can be 30+ rwhp, more commonly 15-20rwhp is realistic.
Eventually the Fast becomes the restriction and a different style intake comes into play for all out high RPM power (but at the sacrifice of low-mid range torque). Seems in high HP applications the Fast just kind of stalls out around 6,500 rpm and flat lines to redline where a tunnel ram intake can continue to climb.
Now is the cost of a Fast worth the gains on a stock or bolt on car? That's a personal opinion but I would lean towards a cam or heads/cam first. The intake can easily be switched later when it will have a better increase.
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This is not really a correct way of thinking about it. There is rarely a HP number line drawn in the sand for which an intake or exhaust are "good for". There are guys making 450+rwhp with the LS6 intake...but that doesn't mean they aren't leaving a lot on the table by doing so.
Even on a stock engine the Fast intake will make more peak power. 8-12rwhp seems to be a good expectation for a bolt on LS1.
Depending on cam and heads and displacement it will make progressively more over the LS6 as the LS6 becomes a more significant airflow obstruction. In some applications this can be 30+ rwhp, more commonly 15-20rwhp is realistic.
Eventually the Fast becomes the restriction and a different style intake comes into play for all out high RPM power (but at the sacrifice of low-mid range torque). Seems in high HP applications the Fast just kind of stalls out around 6,500 rpm and flat lines to redline where a tunnel ram intake can continue to climb.
Now is the cost of a Fast worth the gains on a stock or bolt on car? That's a personal opinion but I would lean towards a cam or heads/cam first. The intake can easily be switched later when it will have a better increase.
Even on a stock engine the Fast intake will make more peak power. 8-12rwhp seems to be a good expectation for a bolt on LS1.
Depending on cam and heads and displacement it will make progressively more over the LS6 as the LS6 becomes a more significant airflow obstruction. In some applications this can be 30+ rwhp, more commonly 15-20rwhp is realistic.
Eventually the Fast becomes the restriction and a different style intake comes into play for all out high RPM power (but at the sacrifice of low-mid range torque). Seems in high HP applications the Fast just kind of stalls out around 6,500 rpm and flat lines to redline where a tunnel ram intake can continue to climb.
Now is the cost of a Fast worth the gains on a stock or bolt on car? That's a personal opinion but I would lean towards a cam or heads/cam first. The intake can easily be switched later when it will have a better increase.
Thank you. Ya ima just start off with cam/heads first. Thinking bout 243 heads n ms3 -ms4 cam . Not sure yet
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What cam spec's?
What cylinder heads?
The LS6 worst weakness is the 78mm TB. The Fast 90/92 will make more hp. Depending on the tuners skill the Fast may not be drive quite as well as the LS6.
The LS6 with a 90mm snout works very well. TPiS can do the mod. Dorman coming LS2 with 92mm TB opening
could also be a contender.
What cylinder heads?
The LS6 worst weakness is the 78mm TB. The Fast 90/92 will make more hp. Depending on the tuners skill the Fast may not be drive quite as well as the LS6.
The LS6 with a 90mm snout works very well. TPiS can do the mod. Dorman coming LS2 with 92mm TB opening
could also be a contender.
Thanks for your input . . Atm stock heads and stock cam. Was leaning for some 243 head's, maybe ms3- ms4 cam. Not sure yet
MS3/MS4 in a stock displacement LS1 is too much cam for me. I don't have direct experience with that type of LS build other than meeting some folks with driveability issues at cars & coffee. The MSD might be worth a look too. I will be quite now.
Go smaller on the cam 228/232 or 230/236, maybe even up to a 232/238 but that would be max IMO for a street car. Spend the money on the heads and it will be faster and drive nicer then a donkey dicked cam'd LS1 with average heads.
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[QUOTE=kinglt-1;19485724]Go smaller on the cam 228/232 or 230/236, maybe even up to a 232/238 but that would be max IMO for a street car. Spend the money on the heads and it will be faster and drive nicer then a donkey dicked cam'd LS1 with average heads.[/QUOT
Whats a good cam? As in average heads you mean 243 heads?
Whats a good cam? As in average heads you mean 243 heads?
1998 LS6 swapped Z28 here. Full bolt-on, but stock internal LS6. Had an SLP modified LS6 intake and put down 385 RWHP. Swapped over to FAST 92 w/NW 92 TB and put down 400.1 RWHP. No other changes made.
When I was running a F11 from Futral with stock 241 heads and switched to a Fast 92 I picked up 24whp. I forgot the torque number as this was when they first came out. I gained some good mph at the track too. It was a worthy swap from the LS6 especially when I added spray and built the engine and upped the shot. At that time I got $350 for my LS6 intake too.