isis intake manifold? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

colombianbryan · 08-09-2011, 08:50 AM

I never owned an isis product for my car but hey for $200 for a new isis intake manifold sounds good. i mean i would like a greddy but dont have 700 laying around. should i save up or does anyone have any good experience with them? oh yea for an s14 sr20det

Sileighty_85 · 08-09-2011, 10:14 AM

you should search, this has been covered as well as a write up on the install

colombianbryan · 08-09-2011, 11:09 AM

alrighty cool

ultimateirving · 08-09-2011, 09:13 PM

research shows u gain some top end, but lose low end torque on stock sr set up.
so if u like to drift, low end torque is important, may not be worth it til you have quite a few supporting mods.

TFD · 08-10-2011, 11:05 AM

Hi mate,

I'll give you some response on this one since the S14 manifold hasnt been covered properly.... Just about 1 thread I reckon.

I bought one a few weeks back from 240sxMotering.com.

- Overall looks nice.
- You need to dremel the runners since there's some good cast leftovers there.
- Runners didnt line up with lower manifold runners

- Idle hose connection needs to be redirected to avoid coalision with injector #3.
I dremeld (?) the 1st runner a bit more so it did line up more or less with the lower 1st runner. No points earned here in my opinion...

Im building the lot back together right now and want to dyno oem vs. Isis manifold soon (if the car runs... fingers crossed).

Would I buy it again? Mhh... if the runners are ok, yes... otherwise get a 2ndhand Greddy.

colombianbryan · 08-10-2011, 03:32 PM

awesome tfd! helped me out alot. im running a gt28 turbo, fmic, exhaust manifold, turbo outlet, 3 inch downpipe to 3 inch catback. i also want to get a z32 maf so i know im going to have to tune it. and im not drifitng much so i dont mind if i lose a little torque. thanks guys! guess ill save for a greddy

TFD · 08-10-2011, 04:00 PM

GT28 as in stock S14 turbo?
Dont mind the manifold then, keep the original one.

T28 is midrange turbo so support it with midrange cams and midrange manifold (=oem).

I run 2871 .86 mid-topend turbo with 264 mid-topend cams and mid-topend manifold.

Good luck

colombianbryan · 08-10-2011, 04:43 PM

well yea gt28rs from the s15. and yea if anything im only going to run 256 cams since its my daily driver and i dont want to kill all my gas haha also im trying to make my engine bay a little more nicer thats why i want to upgrade the manifold also. im just looking for about 300whp and i would be happy

thanks man!

DaveAZ · 05-21-2012, 06:58 AM

My son just got one for his S13 SR. As mentioned, casting sucks. Bad. All of the mounting holes were in the right places, but needed the threads to be chased with a tap.

They put three vacuum bleeds, 1/8 NPT apparently- right below where the throttle body mounts. There was no way in hell we could get any fittings in them. Straight fittings hit the body, and angled fittings hit the manifold. The exception would have been those swivel connectors that we don't use.

Lost a bit on the bottom end, gained a lot after around 3500 RPM. Daily driver, S3 cams, G2871 R, etc. You get what you pay for. IMO, my son wasted his money on it, not because it's a cheap POS, but because he just didn't need the power up there for his DD.

(Edit) The GReddy manifold has those three vacuum ports machined downwards, (vertical) as opposed to the Isis which are horizontal.

Also, much has been posted about the S13 and the throttle pulley issues with aftermarket manifolds. First, we made a template out of a Bud Light 30 pack cardboard. Then we used a piece of angle aluminum stock, 1.5" and machined it (with the trusty Makita angle grinder and beer) until we got a straight pull on the stock throttle cable. We used the stock holes on the manifold, and the OEM manifold clamp and machined it to fit. THEN we had to cut it down again, so we could close the hood. Not real difficult, but tedious.

"Now" we have a Tomei 185001 adjustable FPR on order (with adapter) because the NISMO adj FPR no longer fits the OEM sidefeed fuel rail. The end pipe throws the fuel line up over the top of the throttle cable, and the adjuster screw hits the rocker cover. Forced into being a fanboy. (grin)

08-09-2011, 08:50 AM	#1
colombianbryan Zilvia Junkie Join Date: Sep 2010 Location: Atlanta, GA Age: 29 Posts: 430 Trader Rating: (8) Feedback Score: 8 reviews	isis intake manifold? I never owned an isis product for my car but hey for $200 for a new isis intake manifold sounds good. i mean i would like a greddy but dont have 700 laying around. should i save up or does anyone have any good experience with them? oh yea for an s14 sr20det

08-09-2011, 10:14 AM	#2
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	you should search, this has been covered as well as a write up on the install __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

08-10-2011, 11:05 AM	#5
TFD Leaky Injector Join Date: Dec 2009 Location: Holland Age: 40 Posts: 124 Trader Rating: (4) Feedback Score: 4 reviews	Hi mate, I'll give you some response on this one since the S14 manifold hasnt been covered properly.... Just about 1 thread I reckon. I bought one a few weeks back from 240sxMotering.com. - Overall looks nice. - You need to dremel the runners since there's some good cast leftovers there. - Runners didnt line up with lower manifold runners - Idle hose connection needs to be redirected to avoid coalision with injector #3. I dremeld (?) the 1st runner a bit more so it did line up more or less with the lower 1st runner. No points earned here in my opinion... Im building the lot back together right now and want to dyno oem vs. Isis manifold soon (if the car runs... fingers crossed). Would I buy it again? Mhh... if the runners are ok, yes... otherwise get a 2ndhand Greddy. __________________ JDMstyle-Driftstyle-Dish-Stickerbomb-Stretch-Bye Bye Kitty... Last edited by TFD; 08-10-2011 at 11:36 AM..

08-10-2011, 04:00 PM	#7
TFD Leaky Injector Join Date: Dec 2009 Location: Holland Age: 40 Posts: 124 Trader Rating: (4) Feedback Score: 4 reviews	GT28 as in stock S14 turbo? Dont mind the manifold then, keep the original one. T28 is midrange turbo so support it with midrange cams and midrange manifold (=oem). I run 2871 .86 mid-topend turbo with 264 mid-topend cams and mid-topend manifold. Good luck __________________ JDMstyle-Driftstyle-Dish-Stickerbomb-Stretch-Bye Bye Kitty...

05-21-2012, 06:58 AM	#9
DaveAZ Leaky Injector Join Date: Sep 2011 Location: AZ Age: 61 Posts: 84 Trader Rating: (5) Feedback Score: 5 reviews	My son just got one for his S13 SR. As mentioned, casting sucks. Bad. All of the mounting holes were in the right places, but needed the threads to be chased with a tap. They put three vacuum bleeds, 1/8 NPT apparently- right below where the throttle body mounts. There was no way in hell we could get any fittings in them. Straight fittings hit the body, and angled fittings hit the manifold. The exception would have been those swivel connectors that we don't use. Lost a bit on the bottom end, gained a lot after around 3500 RPM. Daily driver, S3 cams, G2871 R, etc. You get what you pay for. IMO, my son wasted his money on it, not because it's a cheap POS, but because he just didn't need the power up there for his DD. (Edit) The GReddy manifold has those three vacuum ports machined downwards, (vertical) as opposed to the Isis which are horizontal. Also, much has been posted about the S13 and the throttle pulley issues with aftermarket manifolds. First, we made a template out of a Bud Light 30 pack cardboard. Then we used a piece of angle aluminum stock, 1.5" and machined it (with the trusty Makita angle grinder and beer) until we got a straight pull on the stock throttle cable. We used the stock holes on the manifold, and the OEM manifold clamp and machined it to fit. THEN we had to cut it down again, so we could close the hood. Not real difficult, but tedious. "Now" we have a Tomei 185001 adjustable FPR on order (with adapter) because the NISMO adj FPR no longer fits the OEM sidefeed fuel rail. The end pipe throws the fuel line up over the top of the throttle cable, and the adjuster screw hits the rocker cover. Forced into being a fanboy. (grin) Last edited by DaveAZ; 05-21-2012 at 09:08 AM..

08-09-2011, 11:09 AM	#3
colombianbryan Zilvia Junkie Join Date: Sep 2010 Location: Atlanta, GA Age: 29 Posts: 430 Trader Rating: (8) Feedback Score: 8 reviews	alrighty cool

08-09-2011, 09:13 PM	#4
ultimateirving Zilvia FREAK! Join Date: Nov 2010 Location: arizona Age: 33 Posts: 1,519 Trader Rating: (1) Feedback Score: 1 reviews	research shows u gain some top end, but lose low end torque on stock sr set up. so if u like to drift, low end torque is important, may not be worth it til you have quite a few supporting mods.

08-10-2011, 03:32 PM	#6
colombianbryan Zilvia Junkie Join Date: Sep 2010 Location: Atlanta, GA Age: 29 Posts: 430 Trader Rating: (8) Feedback Score: 8 reviews	awesome tfd! helped me out alot. im running a gt28 turbo, fmic, exhaust manifold, turbo outlet, 3 inch downpipe to 3 inch catback. i also want to get a z32 maf so i know im going to have to tune it. and im not drifitng much so i dont mind if i lose a little torque. thanks guys! guess ill save for a greddy

08-10-2011, 04:43 PM	#8
colombianbryan Zilvia Junkie Join Date: Sep 2010 Location: Atlanta, GA Age: 29 Posts: 430 Trader Rating: (8) Feedback Score: 8 reviews	well yea gt28rs from the s15. and yea if anything im only going to run 256 cams since its my daily driver and i dont want to kill all my gas haha also im trying to make my engine bay a little more nicer thats why i want to upgrade the manifold also. im just looking for about 300whp and i would be happy thanks man!

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