Mr2 N/A Header and Exhaust Question - Toyota Nation Forum : Toyota Car and Truck Forums

jonfish490 · 06-02-2006, 03:39 PM

I currently own a 91 n/a mr2 and am wondering which brand header would provide more performance. Also would it be better to get the header first then the exhaust or doesnt it matter? All i currently have done is a Weapon R intake. Thanks alot

***MR2Jedi*** · 06-02-2006, 07:00 PM

I would get the header and work your way back...as for brands. not that many choices to start with.Check the welds, fitment and how smooth this inside is.

nepopolus · 06-03-2006, 03:09 PM

actually the ebay headers are not bad for the non turbo, when i had my 5sfe i had them made it sound awsome! throttle response got a little better as well (just dont do what i did and run only headers...my engine blew up in 2 days) why i have a 3sgte now...lol

***MR2Jedi*** · 06-03-2006, 03:11 PM

and how could an engine blow from headers?

Gairloch · 06-05-2006, 03:47 PM

^^ it wouldn't.

***MR2Jedi*** · 06-05-2006, 04:01 PM

Quote:

Originally Posted by Gairloch

^^ it wouldn't.

My thoughts exactly.....must be some other reason....

BrightTundra04 · 06-06-2006, 06:18 PM

from the sound of it he was running only a header.

nepopolus · 06-07-2006, 10:23 AM

ya it was only headers btw

and the car had alot wrong with it when i first picked it up....that probly just sent it over the edge

***MRQtwinturbo*** · 06-07-2006, 10:25 AM

i would start off with an exhaust first...with NA...very limited aftermarket support avail..

***MR2Jedi*** · 06-07-2006, 10:48 AM

Quote:

Originally Posted by nepopolus

ya it was only headers btw

and the car had alot wrong with it when i first picked it up....that probly just sent it over the edge

Before modding the engine, you should make sure that all systems are in good shape. Cooling, oil, fuel, ignition, compression,valve train, timing belt, intake, exhaust, etc. modding will put more stress on these systems, so they really need to be in good running order.

HighSpeedScene · 06-09-2006, 12:07 PM

Look for a 4-2-1 header, as the SSAC and other 4-1 headers are better suited for a top end happy car.

RideMr2 · 06-27-2006, 09:47 PM

I had a header put on 91 mr2 5sfe today. The ssautochrome one, which came with a downpipe as well. I also got a new O2 sensor oem style (bosch).

I also lost the cat.

I know the shop owner, and this was no problem.

It sounds as if the header is leaking where it bolts up to the engine.
You cannot hear the leak at idle, and oddly it gets better/no leak when the rpm's go up.
Seems worst at 2500-3500 rpm.

I know nothing about headers, so am hoping all this info will help to find the problem.

The gasket that came with the header was thick, about the size of 3 oem gaskets.
This gasket was damaged, so the shop got one from napa. The other gaskets were ok, downpipe, to muffler.

I am wondering if this could be the problem, and maybe using 2-3 oem type gaskets would fix it?

Any other ideas?

RideMr2 · 06-27-2006, 09:52 PM

***MR2Jedi*** · 06-27-2006, 10:09 PM

I have doubled OEM gaskets before to get a good seal.. Don't know if it's a good practice, just that it worked.

RideMr2 · 06-28-2006, 03:50 PM

I found the problem with this, I am pretty sure.

The stud/nut, which is facing

<<<<< direction in the picture above, and is also facing down, Hard to see in the picture, is missing.
Bottom left corner of header in picture.

There is no stud there, nothing, just a hole.
This hole is not the cause of the leak, but it is keeping the header from getting a TIGHT seal.

I found a bolt, by extreme luck, that threaded right into this hole easy like, with no force needed.

I was very easy with this bolt, and it starts to slip when it is almost fully seated.
This bolt goes inside, and is the same size as the other Studs in Length.

The bolt will not get tight though, it will get firm, but not TIGHT.
Even Semi_Tight though, the leak problem is so much better.

I went back to the shop, told them all this, and this was the advice given.

Go to toyota, order both the stud, and the nut for this hole, since the stud is at least not broken off blocking access to the threads inside of the head. Which means that is GREAT NEWS.

That should fix the problem. as the bolt alone, had made things MUCH better, but still a tiny leak, and the bolt was just to see if the threads inside were there, or blocked off by a broken stud.

Also; the person who did the work said the gasket should not cause the leak, he still had plenty of thread left on the bolts, which went on the studs, after he torqued things down.

Will See, as I am off to order a stud and bolt from Toyota, and hoping I am on my way to a leak free header.