Intake manifold time, need advice!
Thread Starter
Burning Brakes
Joined: Mar 2005
Posts: 1,019
Likes: 0
From: Chico CA
Intake manifold time, need advice!
Hi, I've got a 2001 coupe that needs to breathe better, here is a list of the mods done so far:
vararam cai
vararam air bridge
ported/polished 78mm throttle body
stock manifold (ls6 manifold???)
patriot stage 2 heads
thunder racing cheatr cam
long tubes, high flow cats, no mufflers
The car is putting out 406/383 to the wheels and my tuner said it was being choked for air, thus the need for a new manifold. I was set on a new weiand street warrior but we all know thats not going to happen. My primary goal is to not lose low end power as that is where I spend most of the time. I know very little about manifolds but I've heard that I could lose some low end power with a fast 92? Any advice would be great!
vararam cai
vararam air bridge
ported/polished 78mm throttle body
stock manifold (ls6 manifold???)
patriot stage 2 heads
thunder racing cheatr cam
long tubes, high flow cats, no mufflers
The car is putting out 406/383 to the wheels and my tuner said it was being choked for air, thus the need for a new manifold. I was set on a new weiand street warrior but we all know thats not going to happen. My primary goal is to not lose low end power as that is where I spend most of the time. I know very little about manifolds but I've heard that I could lose some low end power with a fast 92? Any advice would be great!
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
I don't think you lose any bottom end with a FAST. I have a ported FAST 90/LS2 TB setup, and it improved power from idle up. Since you already have H/C, a FAST setup would be the next logical addition.
Team Owner
Joined: Dec 2008
Posts: 35,874
Likes: 1,600
From: Honolulu HI
Thread Starter
Burning Brakes
Joined: Mar 2005
Posts: 1,019
Likes: 0
From: Chico CA
Thanks for the info! Is there a way to hook it up to my ported 78mm tb? If I have to buy another tb it will probably push me way past my budget 
. I've seen people doing port work on the FAST intakes, with no experience would it be possible for me to do it or would I risk destroying the intake?
. I've seen people doing port work on the FAST intakes, with no experience would it be possible for me to do it or would I risk destroying the intake?
Pro
Joined: Sep 2008
Posts: 713
Likes: 2
From: Tennessee
A ported FAST 92/92 is a must have mod for H/C motors. Gains are typically 15-20whp more over just a stock FAST 92. Get in contact with Tony Mamo @ AFR and get one off him and have him port it. I have seen ridiculous gains with his worked over FAST manifolds.
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
Thanks for the info! Is there a way to hook it up to my ported 78mm tb? If I have to buy another tb it will probably push me way past my budget . I've seen people doing port work on the FAST intakes, with no experience would it be possible for me to do it or would I risk destroying the intake?
. I've seen people doing port work on the FAST intakes, with no experience would it be possible for me to do it or would I risk destroying the intake?
Drifting
Joined: Oct 2003
Posts: 1,932
Likes: 4
From: Warrenville Il
even if you just get a FAST 92, I don't think the 90 is made anymore, you can get a new LS2 throttle body 90mm for pretty cheap.
this will definitely wake up your heads/cam/headers car
Let us know what you decide and show us your hp gains
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Thread Starter
Burning Brakes
Joined: Mar 2005
Posts: 1,019
Likes: 0
From: Chico CA
So a stock ls2 tb will work? Anyone know where I can pick up a used ported version? I'm trying to do this on a budget (I installed all of the mods myself, it was fun and saved $) so new is probably out of the question 
.
.
Racer
Joined: Sep 2008
Posts: 312
Likes: 0
From: Odessa FL
We have the FAST 92's on sale for $799 shipped to your door.
http://www.pm-fl.com/catalog/product...29ebfb84a79968
I do not have any spare LS2 TB's, but I do have a 90mm Comtech TB that I would make you a good package deal on with the intake.
http://forums.corvetteforum.com/c5-p...et-tb-f-s.html
If you are interested, just shoot me a pm and we will talk
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
I hate to be the only different opinion--but my experience is that the fast 92/90 combo is an overkill for a stock cubed engine--taking into the acct your stage 2 hds and mild cam. maybe with a huge cam and super ported hds and an engine running constantly over 6500 , a stock cubed motor might work---But--your hds at .400 lift ( which is the average lift most people use for comparisons) is only 246 cfm and a stock LS6 flows 243 cfm---So your hds are basically a cleaned up version of a LS6 hd. Your cam is very mild and at 114 LSA and i have had no problems tuning this cam and having it pass strict Calif. emmisions.If you have a minute look at this TPS intake maifold comparison--In a nutshell the 92/90 combo did make a bit more power str8 accross the board--but not much more below 6400 RPM's--
To me spending $2500 on a ported 92/90 combo to net about 5 HP is not woth the money or effort--If you are going to run your engine constantly over 6400 then you may see about 15 more HP up there.
You would be better off getting a differnt cam in the 235-240 range with .600 lift at a 112 LSA---I have seen the TSP torquer cam make and additional 18 RWHP over a GM hot cam with a LS6 intake,stock hds.
here is the website--- http://tpis.com/index.php?module=2_17_06
To me spending $2500 on a ported 92/90 combo to net about 5 HP is not woth the money or effort--If you are going to run your engine constantly over 6400 then you may see about 15 more HP up there.
You would be better off getting a differnt cam in the 235-240 range with .600 lift at a 112 LSA---I have seen the TSP torquer cam make and additional 18 RWHP over a GM hot cam with a LS6 intake,stock hds.
here is the website--- http://tpis.com/index.php?module=2_17_06
Thread Starter
Burning Brakes
Joined: Mar 2005
Posts: 1,019
Likes: 0
From: Chico CA
tblu92, thanks for adding another perspective. That is what I was worried about, speding $1k+ and not gaining much over what I've currently got. The specs on the cam that I have from thunder racing are: 214/230 .601/.575 117 LSA and I believe the cam card said it was 216/233 .604 117 LSA.
I would love to put in a better cam but I just can't bring myself to tear the car apart again, no time or energy to do it. I was hoping the weiand would come out as it seemed like a good compromise and came with a reducer plate so I could use my stock tb. I rarely spin the engine over 6200rpm and I believe the fuel cut off is set at 6400 or 6600.
Is there a good alternative to the fast that would work well under 6400rpms? The tpis spyder looks like a different design with the opening on top, would it work on my setup? I've heard bad things about metal parts getting heat soaked.
Rich@pm-fl.com, that looks like a great price, I will order it from you if I can't find a setup that works better! Do you do porting work or is it something an amateur like myself can do with a dremel?
I would love to put in a better cam but I just can't bring myself to tear the car apart again, no time or energy to do it
. I was hoping the weiand would come out as it seemed like a good compromise and came with a reducer plate so I could use my stock tb. I rarely spin the engine over 6200rpm and I believe the fuel cut off is set at 6400 or 6600. Is there a good alternative to the fast that would work well under 6400rpms? The tpis spyder looks like a different design with the opening on top, would it work on my setup? I've heard bad things about metal parts getting heat soaked.
Rich@pm-fl.com, that looks like a great price, I will order it from you if I can't find a setup that works better! Do you do porting work or is it something an amateur like myself can do with a dremel?
Thread Starter
Burning Brakes
Joined: Mar 2005
Posts: 1,019
Likes: 0
From: Chico CA
Would this work with my car and the fast92?
http://cgi.ebay.com/ebaymotors/Ponti...Q5fAccessories
It's not too expensive for a ported tb.
http://cgi.ebay.com/ebaymotors/Ponti...Q5fAccessories
It's not too expensive for a ported tb.
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
I hate to be the only different opinion--but my experience is that the fast 92/90 combo is an overkill for a stock cubed engine--taking into the acct your stage 2 hds and mild cam. maybe with a huge cam and super ported hds and an engine running constantly over 6500 , a stock cubed motor might work---But--your hds at .400 lift ( which is the average lift most people use for comparisons) is only 246 cfm and a stock LS6 flows 243 cfm---So your hds are basically a cleaned up version of a LS6 hd. Your cam is very mild and at 114 LSA and i have had no problems tuning this cam and having it pass strict Calif. emmisions.If you have a minute look at this TPS intake maifold comparison--In a nutshell the 92/90 combo did make a bit more power str8 accross the board--but not much more below 6400 RPM's--
To me spending $2500 on a ported 92/90 combo to net about 5 HP is not woth the money or effort--If you are going to run your engine constantly over 6400 then you may see about 15 more HP up there.
You would be better off getting a differnt cam in the 235-240 range with .600 lift at a 112 LSA---I have seen the TSP torquer cam make and additional 18 RWHP over a GM hot cam with a LS6 intake,stock hds.
here is the website--- http://tpis.com/index.php?module=2_17_06
To me spending $2500 on a ported 92/90 combo to net about 5 HP is not woth the money or effort--If you are going to run your engine constantly over 6400 then you may see about 15 more HP up there.
You would be better off getting a differnt cam in the 235-240 range with .600 lift at a 112 LSA---I have seen the TSP torquer cam make and additional 18 RWHP over a GM hot cam with a LS6 intake,stock hds.
here is the website--- http://tpis.com/index.php?module=2_17_06
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Actaually they report the Fast set up to make the most HP--I'm not saying you won't make more HP but the big #'s are all up in the RPM range--so on a daily driver type car that rarely sees 6400--it is an over kill----AND I am never impressed with dyno #'s--to me the dyno is ONLY a tuning tool--You can't win a race with a dyno slip--I have raced and beaten so many cars with max rated 425-440 RWHP . those big #'s only pop up briefly at 6400-6800---(with my 390 RWHP)--- It's the overall average HP and useable HP that makes you fast--not an inflated dyno slip--
You can't beat the LS6 intake as far as I'm concerned for most cars--although i did cave in and buy a Fast 78---I saw NO performance gains and no better ET's or MPH--As far as dyno HP? I don't care--
Each has his own opinion on this---But i will say TPIS is an old quality Co.--with no agenda and great people--they are racers and conducted this test to make their car faster----
You can't beat the LS6 intake as far as I'm concerned for most cars--although i did cave in and buy a Fast 78---I saw NO performance gains and no better ET's or MPH--As far as dyno HP? I don't care--
Each has his own opinion on this---But i will say TPIS is an old quality Co.--with no agenda and great people--they are racers and conducted this test to make their car faster----
Melting Slicks
Joined: Jun 2003
Posts: 2,156
Likes: 0
From: S.W. Ohio
With all due respect, I disagree that you need a monster cam to benefit from a FAST install. I've only got a 228/232, and got over 25RWHP when I changed from a LS6 mani. You have to admit, the article you get your information from is not objective, as the tests are conducted by TPIS, they obviously have a particular interest in making their products look best.
Thread Starter
Burning Brakes
Joined: Mar 2005
Posts: 1,019
Likes: 0
From: Chico CA
Thanks everyone for all of the input, it is all good and all very confusing . I know I'm choked for air up top (according to my tuner) so an intake manifold would help I believe. Unfortunately because I don't spend all of my time at 6400rpms it might be a bit of a waste. It looks like I could try swapping out cams for something like a 228/228 112 to get some more low/mid range power but the cost on that is going to be fairly high. On the manifold front it's looking like a fast with a new tb will also be quite expensive but easier to install. I really don't like the cheatr cam, it's very soft until 4k rpms. The engine also has a VERY loud tick from the cam (so I've been told) so changing cams would help in that regard also. I'm up in the air right now, any thoughts?
. I know I'm choked for air up top (according to my tuner) so an intake manifold would help I believe. Unfortunately because I don't spend all of my time at 6400rpms it might be a bit of a waste. It looks like I could try swapping out cams for something like a 228/228 112 to get some more low/mid range power but the cost on that is going to be fairly high. On the manifold front it's looking like a fast with a new tb will also be quite expensive but easier to install. I really don't like the cheatr cam, it's very soft until 4k rpms. The engine also has a VERY loud tick from the cam (so I've been told) so changing cams would help in that regard also. I'm up in the air right now, any thoughts?
Racer
Joined: Sep 2008
Posts: 312
Likes: 0
From: Odessa FL
Rich@pm-fl.com, that looks like a great price, I will order it from you if I can't find a setup that works better! Do you do porting work or is it something an amateur like myself can do with a dremel?
Thread Starter
Burning Brakes
Joined: Mar 2005
Posts: 1,019
Likes: 0
From: Chico CA
Racer
Joined: Apr 2005
Posts: 351
Likes: 0
From: Louisville Kentucky
With all due respect, I disagree that you need a monster cam to benefit from a FAST install. I've only got a 228/232, and got over 25RWHP when I changed from a LS6 mani. You have to admit, the article you get your information from is not objective, as the tests are conducted by TPIS, they obviously have a particular interest in making their products look best.