Run a fast 90 or an ls6? Help me choose!
12-16-2016, 05:25 AM
#41
On a side note, does anybody know if its worth the time and energy to smooth out the ridge in the runner? It was mentioned earlier in the thread. I did a search on it and found an old thread with a guy blending it into the wall. Not much info on it other than that. Anybody have anything on that subject?
Ps. Happy holidays to all.
12-16-2016, 07:03 AM
#42
I checked into it as well, seems that at most with the 90, there is up to about 10hp to b gained with porting..if u have time, patience and tools and do it urself, I'd say it's worth it , even if u only achieve 5hp on your own.. it was FREE
Last edited by z28241; 12-16-2016 at 07:12 AM.
12-16-2016, 08:21 AM
#43
If you are confident in your abilities to run a dremel with a sanding wheel pretty steady then go for it.
If you don't have steady hands it might be best to leave it alone.
There should be some really good threads with pictures to help guide you.
If you don't have steady hands it might be best to leave it alone.
There should be some really good threads with pictures to help guide you.
12-16-2016, 10:16 AM
#47
Aside from removing the runner ridge, the search feature doesnt reveal much info on other possible touch up spots.
12-19-2016, 08:14 PM
#54
If your going to use the FAST 90mm/92mm intake, I would get the matching throttle body and sell the Summit 85mm Throttle body.
What did your home ported 243's flow?
I'm the odd person on the intake choice. With the 224/224 cam, I personally would go with the LS6 and have Tuned Port Induction Specialists do the 90mm snout. I would also go with a matching 90mm TB. The Dorman LS2 might be worth a look too if it come out in time for your project. From what I've seen and experienced the LS6 90mm is easier to tune and get dailed in for driveability. It might give up a little top end hp to the FAST 90 or it might not. Only way to know for sure with your combination would be to test back to back. I would rather have 99% stock driveability with an LS6 90mm and give up a few upper rpm hp than 85-95% (depending on the tuners skill or lack of skill) with the FAST 90 and gain a few upper rpm hp.
If you are an expert tuner or have a real expert tuner to work with then the FAST 90 should work out very nice.
FWIW the Peak Performance ported LS6 TPiS 90mm intake on my 91 RS's 383 LS1 stroker made 2 rwhp more at high rpm than the FAST LSXRT 102 with NW 102 TB. The modded LS also made slightly more torque overall. The FAST 90 made 3 hp less. Back back testing same conditions. My RS has a small cam for a 383 and surprisingly my 383 worked best with the modded LS6 intake. I suspect with a bigger cam both FAST intakes would have made more hp in the upper rpms. I also suspect if my FAST LSXRT had been ported it probably would have made more hp & tq both peak and area under the curve.
In closing, I really think a 90mm TB to go with the Fast 90 will be betfer than an 85mm TB.
What did your home ported 243's flow?
I'm the odd person on the intake choice. With the 224/224 cam, I personally would go with the LS6 and have Tuned Port Induction Specialists do the 90mm snout. I would also go with a matching 90mm TB. The Dorman LS2 might be worth a look too if it come out in time for your project. From what I've seen and experienced the LS6 90mm is easier to tune and get dailed in for driveability. It might give up a little top end hp to the FAST 90 or it might not. Only way to know for sure with your combination would be to test back to back. I would rather have 99% stock driveability with an LS6 90mm and give up a few upper rpm hp than 85-95% (depending on the tuners skill or lack of skill) with the FAST 90 and gain a few upper rpm hp.
If you are an expert tuner or have a real expert tuner to work with then the FAST 90 should work out very nice.
FWIW the Peak Performance ported LS6 TPiS 90mm intake on my 91 RS's 383 LS1 stroker made 2 rwhp more at high rpm than the FAST LSXRT 102 with NW 102 TB. The modded LS also made slightly more torque overall. The FAST 90 made 3 hp less. Back back testing same conditions. My RS has a small cam for a 383 and surprisingly my 383 worked best with the modded LS6 intake. I suspect with a bigger cam both FAST intakes would have made more hp in the upper rpms. I also suspect if my FAST LSXRT had been ported it probably would have made more hp & tq both peak and area under the curve.
In closing, I really think a 90mm TB to go with the Fast 90 will be betfer than an 85mm TB.
12-19-2016, 08:38 PM
#55
If your going to use the FAST 90mm/92mm intake, I would get the matching throttle body and sell the Summit 85mm Throttle body.
With the 224/224 cam, I personally would go with the LS6 and have Tuned Port Induction Specialists do the 90mm snout. I would also go with a matching 90mm TB. From what I've seen and experienced the LS6 90mm is easier to tune and get dailed in for driveability. It might give up a little top end hp to the FAST 90 or it might not. Only way to know for sure with your combination would be to test back to back. I would rather have 99% stock driveability with an LS6 90mm and give up a few upper rpm hp than 85-95% (depending on the tuners skill or lack of skill) with the FAST 90 and gain a few upper rpm hp.
If you are an expert tuner or have a real expert tuner to work with then the FAST 90 should work out very nice.
FWIW the Peak Performance ported LS6 TPiS 90mm intake on my 91 RS's 383 LS1 stroker made 2 rwhp more at high rpm than the FAST LSXRT 102 with NW 102 TB. The modded LS also made slightly more torque overall. The FAST 90 made 3 hp less. Back back testing same conditions. My RS has a small cam for a 383 and surprisingly my 383 worked best with the modded LS6 intake. I suspect with a bigger cam both FAST intakes would have made more hp in the upper rpms. I also suspect if my FAST LSXRT had been ported it probably would have made more hp & tq both peak and area under the curve.
In closing, I really think a 90mm TB to go with the Fast 90 will be betfer than an 85mm TB.
With the 224/224 cam, I personally would go with the LS6 and have Tuned Port Induction Specialists do the 90mm snout. I would also go with a matching 90mm TB. From what I've seen and experienced the LS6 90mm is easier to tune and get dailed in for driveability. It might give up a little top end hp to the FAST 90 or it might not. Only way to know for sure with your combination would be to test back to back. I would rather have 99% stock driveability with an LS6 90mm and give up a few upper rpm hp than 85-95% (depending on the tuners skill or lack of skill) with the FAST 90 and gain a few upper rpm hp.
If you are an expert tuner or have a real expert tuner to work with then the FAST 90 should work out very nice.
FWIW the Peak Performance ported LS6 TPiS 90mm intake on my 91 RS's 383 LS1 stroker made 2 rwhp more at high rpm than the FAST LSXRT 102 with NW 102 TB. The modded LS also made slightly more torque overall. The FAST 90 made 3 hp less. Back back testing same conditions. My RS has a small cam for a 383 and surprisingly my 383 worked best with the modded LS6 intake. I suspect with a bigger cam both FAST intakes would have made more hp in the upper rpms. I also suspect if my FAST LSXRT had been ported it probably would have made more hp & tq both peak and area under the curve.
In closing, I really think a 90mm TB to go with the Fast 90 will be betfer than an 85mm TB.
The Fast was purchased only because I got a pretty good deal on it. Actually I didn't pay much more for it than I paid for the ls6. The 85mm Throttle body was just a cheapo I purchased to go onto the ls6 because my stocker was pretty well beat.
Driveability really is paramount in my book. I'm going to call Frost and Maryland Speed in the new year and see what they each have to say. Squeezing every last peak HP is not cool with me if the trade off is reduced street manners. Bad street manners were the cause of my old carbed 383 being shown the door.
I appreciate your advice on the 90mm TPiS ls6. However I'm about done spending on the build as I've gone WAY over my original budget. If a cheap 90 mm throttle body presents itself I may consider it.
Lol....still not 100% sure on running the fast. I may just run the ls6. I can't see the fast making a huge difference, plus I rarely go WOT anyhow.
12-19-2016, 10:09 PM
#56
I know exactly how it feels doing the LS1 into a 3rd Gen, it gets old spending the dollars!
The TBSS intake is also worth a quick look. These are fairly inexpensive but ugly. I'm not sure how much tweaking is needed to fit one in a 3rd gen but im sure it should possible to fit since I had a Fast LSXRT on my 3rd gen.
Good article
http://www.hotrod.com/articles/20-ls...ifolds-tested/
Also WARR Performance makes a decent looking 92mm TB for like $140, there is a thread in this section reviewing it. I have a WARR 92 TB but have not used it yet. Might need a little tweaking.
The TBSS intake is also worth a quick look. These are fairly inexpensive but ugly. I'm not sure how much tweaking is needed to fit one in a 3rd gen but im sure it should possible to fit since I had a Fast LSXRT on my 3rd gen.
Good article
http://www.hotrod.com/articles/20-ls...ifolds-tested/
Also WARR Performance makes a decent looking 92mm TB for like $140, there is a thread in this section reviewing it. I have a WARR 92 TB but have not used it yet. Might need a little tweaking.