1G Intake manifold

[oldmopwater]

It is time for me to buy an intake manifold which is the best to go with for my 91 talon I am leaning toward the forrester, I want the bj's but they are back ordered like 6 months.
List of mods:

Hks 272 cams
Hks Valve springs
HKS valves
Fp Green
660cc injectors

 

[MNGSX]

The short runners of the FRH are good at high RPM.. It would be a good match.. It also withstands a N20 goof up alot better too..

They both have their own pros and cons. .

BJ's has great welding but other welded manifolds are so fragile as compaired to the FRH it is'nt funny.

 

[Tort9320g]

http://www.jmfabrications.com/dsm.html

He's gone 11.5 @ 121 on this with a Green and stock cams, should do the trick for you.

 

[anconover]

Jim Mckeone's manifold is extremely well built. Hes extremely good with a tig, and its a great manifold, i myself have one and would recommend it.

 

[MNGSX]

His look awesome..

I'd like to get a maniflange from him w/o the ports cut.. Match it to my headwork then send it back for the runners and plenum.. Or just buy the parts.. I have a TIG


The bad welds I was talking about are Venom and some of the low buck ones.

 

[Maglin]

I'm sure he is willing to do whatever you want. I'm getting one of his manifolds in a few months.

 

[PaleDSM]

Jim's manifold are very nice and he puts alot of work into them. I'm sure he could work with people on customized apps. too.


Out of all of the available manifold I would look into the Magnus SMIM. Alot of R&D went into the design of that manifold.

 

[MNGSX]

I'm doing some stuff to a 2g head... Lets just say a 2g or a 1g manifold wont work with it.

I could make a template of my ports and send that and he could jet cut off of that.... Hmm.

 

[anconover]

Ive talked to jim a few times. He will custom make an intake manifold to your exact spec if you just give him the specs or draw it out.

Magnus is by far the best manifold IMO, but with them upping the prices etc, its a damn fortune. And jim's shown some nice numbers from his, dropped 4/10s in 1/4.

The ports on the 2g head wont be much larger than the ports he cuts in the flanges anyway so wont be a big deal to have him open them at all. Even CNC machining a 2g head the ports are only so big. Like JAM suggests, a 2g head is better to use to be CNC'd, its a bunch of crap. A ported 2g head still doesnt outflow a stock 1g head.

 

[DSMTurbos]

A ported 2g head still doesnt outflow a stock 1g head.

umm...... yes it does.

 

[KPWSerpiente]

You need to be more clear on your goals with the car. Is it autoxed? Do you compete in time trials? Or is it strictly for the dragstrip? Also, what do you plan to rev to?

-T

 

[MNGSX]

umm...... yes it does.

Ho hum normal porting no..

When you have to move the injectors to bungs on the intake runners because there is'nt room for them anymore.. Hell yes. Ask BJ's about their raised runner 2g head and intake or ask FFWD about theirs.

The port floor height makes for a better shot thru the valves.. You can enlarge the roof of the port a good bit. It still is'nt as big as a 1g but very close. But it does'nt have to be because there is a higher flow coeficient due to the better port floor angle. So at 75% or what ever it ends up as of a 1g port volume it outflows it considerably.


Im not doing this.. Actually I'm not talking about what I'm doing... not all of it...
Here BCE converted a 2g head to a 1g ports.. I'll mostly be leaving the port bottom alone and working with the top... There may be some trickery im not but the bottom of the port will be the same as the far right one on the pictured head.

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http://sportcompactcarweb.com/tech/0009scc_ssbbpart4/

 

[anconover]

I didnt finish my sentence, i meant to say it doesnt outflow a 1g much worth a shit.

Im not going to get into the 2g vs 1g head debate because its retarded. The 1g head is superior to that of the 2g head anyway you want to put it.

 

[MNGSX]

Really is that why they get about $3000 for one.

Small block chevys, fords, mopar.. damn near everything has racing head OE MFG part # or aftermarket AFR heads etc with raised runners. AFR makes a raised runner LT1 head... In fact the difference between a LT1 and an LT4 is the raised runners.
They have flowbench data on their website. They have two heads that are identical except for the raised runner.. Go compare the flow data. It works...

Stock V stock the 1g comes out on top. A full tilt do anything possible to a head make over of each and the 2g wins.

Thats not opinion but facts. I have a ported 1g on the car now.. The next block is going to be capped off by a wicked 2g raised runner.

 

[na90dsm]

ffwd does somethign liek that to his death heads, relocates the injector ports,raises the roof and throws in 2mm oversized valves. flows insane amounts of air

 

[MNGSX]

BJ's head service did it before.. But yes that is the game plan... well most of it ....


I came up with a little sumthin extra to flow a bit more than that..

 

[na90dsm]

cant figure otu how. thats liek a total race head reworked and stuff moved. if you can outflow that dude i aplaud you

 

[MNGSX]

Well I'm in tight with some machinists. For the 2mm over valves we need larger seats.
Basically I'm doing everything they do plus something.

 

[na90dsm]

make sure you take pics, i wanna see how much is done with relocating stuff,how much is added ect. i always wondered about that but never found info. wonder why

 

[MNGSX]

Kinda why some turbos are called T4 secret not like

T4 modified 72 comp wheel in extrude honed housing... blah blah anyway the cool stuff people go about.

 

[BOOSTIN21]

check this out
www.throttlebodypower.com

I know this guy he lives a block away from me and he does outstanding work. He has done work for HKS and Greddy I believe. Nice guy too.

 

[oldmopwater]

You need to be more clear on your goals with the car. Is it autoxed? Do you compete in time trials? Or is it strictly for the dragstrip? Also, what do you plan to rev to?

-T

Its set up for autox more than anything but I go to the dragstrip ocassionaly mainly I just like the gut wrenching feeling I get when I push the pedal to the floor in traffic

 

[BluemeanieTSi]

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notice that all of the aftermarket manifolds spool up quicker than the stock manifold. However the stock manifold appears to out perform all of the aftermarket manifolds in the mid range. All of the aftermarket manifolds out perform the stock manifold in the upper ranges. In looking at the chart, it is easy to see that where the stock manifold flattens out (at around 6600 rpm's), the aftermarket manifolds are still climbing. Had the test been run to a higher rpm limit, the differences would have been even more pronounced. At the very top end of the chart, all but two of the manifolds have begun to flatten out. The BJ and Magnus manifolds are still increasing.

 

[anconover]

for an autoX vehicle with the occasional 1/4mi run id stick with a 1g manifold most likely. Plenty of power can be made on the 1g mani as well as good times.

 

[na90dsm]

damn looks liek ill need a aftermarket mani