Intake manifold

[MR2Jedi]

I bought this intake manifold a couple of years ago.There are only 4 large runners that would cover 2 intake passages.My question is: will it give me any more HP? And should I still use the TVIS or remove it? I would like to keep that bottom end torque.


Anyway, I'm thinking about using this manifold now, but only if it'll make a difference.
here are the present mods:'91 MR 2 turbo
Block rebuilt
Bored and honed .040 over
JE forged pistons 9:0-1 C/R
Polished crank
New engine and rod bearings, seals
ATS CT27 turbo
ATS 3" downpipe
KO racing 3" catback to dual exit
Greddy IC and piping
9" spal fan
STage 2 Spec Clutch
12lb Fidanza lightened flywheel
Greddy Profec II EBC
HKS turbo timer
opinions please. Manifold or not?




I had different plans for the car-'91 MR2 turbo-but things changed.
I just finished a rebuild and am doing finishing stuff before cranking it up. (been busy at work, no time ).

[TheEngineer]

An intake manifold on these cars will make a HUGE difference. The stock intake mani is soooo restrictive. I remember someone telling me that you could add almost 25-50hp with an intake mani (obviously not alone, but with the adjusted tuning). And if your gonna go with the intake mani, IMO i would dump the TVIS system.

[MR2Jedi]

I have heard that too, but was skeptical. I appreciate your input. I think I'm gonna run the car the way it for a few weeks so I will be able to tell the difference when I put the manifold on.Plus I need to break in the new clutch too.
Haven't seen you on here for a long while. Where have you been and what have you been up to?

[TheEngineer]

IDK i kinda disapeared for a while and forgot about this site. Just been busy i guess. But happen to get bored and came back. Forgot how nice of a site this is

[MR2Jedi]

Understood. Good to have you back.Don't be a starnger.

[MR2Brock]

To get the most out of that mani you'll need to ditch the tvis, but you will loose a little in the low rpm range. Tvis is designed to increase airflow speed to improve fuel atomization by reducing the inlet diameter. Good for a daily driver but bad for big HP. What are your HP goals? If you only want to go to 300 you could just stay with the stock manifold. If you're looking for 400+ then you will need it for sure. But then you're also talking about another turbo upgrade, and a bigger intercooler, bigger injectors, some sort of new engine management, etc. Are you on mr2oc.com? Lost of good info on there.

[TheEngineer]

^^yea agreed. When you starting talking about even over 350hp i would start thinking intake manifold. But i have also seen dyno charts w/ and w/out the TVIS and there is not much of a difference on the upper range because all ports are open in the top end and really doesnt have a huge effect on 400hp cars. But i just say remove more for having a cleaner engine bay. Gets rid of all the vacuum lines for it.

[MR2Jedi]

Yeah, I'm aware of what the TVIS' function is. I'm not looking for uber HP. Just something more spirited.
Besides the mods I listed above, I plan on going with Supra 550cc injectors, Walbro fuel pump, ATS bored fuel rail, ATS FPR, ATS Adj. Cam Gears and 264 cams. Possibly the GSC 268's but more than likely the HKS 264's. And thats it! I'm stopping there. No more money into the car!
Thats why I was asking about the intake manifold. A couple of years ago I had decided to go for 400+ HP. But sincethen , have changed my mind.
So- with the present mods, will the manifold be beneficial? And with the other planned upgrades, will it be beneficial? I don't really have a HP goal, just wanna go with the set up I described. Should put me in the 300hp range. I'll be very happy with that.

[TheEngineer]

I think the HKS gears are FAR overpriced. There are way better alternatives that are cheaper. I went with the GSC's however ive yet to run them. But i wouldnt advise buying GSC's anymore becuase everyone is complaining about how long it takes to get them TCS now is selling a new cam from Kelford that is supposed to be pretty good, however he only currently stocks a 258 (but with your mods should be fine)
http://www.tcsmotorsports.com/caandcamge.html

[MR2Jedi]

OK, Thanks for the heads up.
I like what what Scott and Aaron have done with the stock cam gears and made them into adjustables. I think they're stronger and less likely to slip. the price is right too.
So you think using that manifold would net me some HP with my current set up? If not, I may sell it. IDK

thats a good price for those cams. That would be another 20 degrees! hhmm?

[TheEngineer]

nah you dont want that manifold....ill take it, hahaha JK

If ya got it its worth using. I mean if you were wondering about buying one i would probably say dont spend the extra money. But since you have it, youll definetly benefit

[MR2Jedi]

OK, cool. I do wanna use it.

[TheEngineer]

are you sure you really want to use it....id be happy to take that off your hands, hahaha

[SnowRocker88]

Using TVIS with merged runners like that (4 instead of 8) would just make more tirbulance instead of more low-end torque...

[MR2Jedi]

Originally Posted by TheEngineer

are you sure you really want to use it....id be happy to take that off your hands, hahaha

Yeah, espeacially after your advice!. But if I change my mind, I'll PM you.....

Originally Posted by SnowRocker88

Using TVIS with merged runners like that (4 instead of 8) would just make more tirbulance instead of more low-end torque...

Thats an interesting point. Though I think it would still make some low end torque than without. I'm probably gonna remove after I break in the engine , new clutch and Dyno it for a later comparison. Thanks

Haven't seen you on the board for awhile too. Where have you been and whatcha been up to?