manifold upgrades for ct26
- Thread starter futeki_supra
- Start date
thanks for the info guys, I didnt relize that stock mani was so good,
If I upgrade I will only be going to a ct26/57trim anyways so it sounds like the stocker should do
If I upgrade I will only be going to a ct26/57trim anyways so it sounds like the stocker should do
the manifold is fine really, some people have gone for a port on it, i personally want to port my manifold before i upgrade from my ct-26 60-1, it makes over 400 as is at 18 psi, and im getting a sp67gt soon for the stock pattern and it seems that a ported manifold would be a good investment or time investment.
in all reality, why not buy a chinese manifold from ebay (cheap but reliable), and have a mounting plate matched to the ct-26 and welded onto the manifold...??? sorry no machining or hardcore fabricating experience so i have no idea
in all reality, why not buy a chinese manifold from ebay (cheap but reliable), and have a mounting plate matched to the ct-26 and welded onto the manifold...??? sorry no machining or hardcore fabricating experience so i have no idea
I just wanted something to improve spool, but keep everythign in the stock location and what not
So what's the problem?
Even upgraded CTs see full boost before 3500 right?
When are you ever going to be that low in the RPM while racing?
Even upgraded CTs see full boost before 3500 right?
When are you ever going to be that low in the RPM while racing?
CryoSlash said:
Thats cause all NA's are are lag, then once you hit like 4500 RPMS, its even more lag.
there isnt a "problem",
a manifold is a cheap easy good upgrade to help spool time, I am fine with spool around 3k, but I would be even happier with less spool time,
I was just curious if there was any available
a manifold is a cheap easy good upgrade to help spool time, I am fine with spool around 3k, but I would be even happier with less spool time,
I was just curious if there was any available
So extrude honing vs you "diy'ing" gasket matching the mani to the gasket holes of course are. . . . Cleaner ports ?
And how about grinding down the divider in the middle of the exhaust side..inside the mani?
need pics..or are ya following me?
And how about grinding down the divider in the middle of the exhaust side..inside the mani?
need pics..or are ya following me?
futeki_supra said:
With a 7m? If you want to do extended full throttle runs with a 7m, and you can't spring for an upgraded turbo and manifold, then I really don't even see the car finishing the first race, let alone a whole season. You should be looking at a JZ engine, unless you have a huge budget and all the resources to build an almost completely custom 7m engine. I'm being totally honest too, I'm not just bashing the 7m. It can make good power, and it can have fast spool, but high speed cornering and full throttle blasts for 30 minutes at a time.........it is not going to like that one bit. I know of more then a few people who had their 7m die at (or right after) Willow Springs raceway.
Now for the turbo question, the restriction is not the manifold, it's the stock ct26 turbo. People have made over 550whp on a stock exhaust manifold, but not even close to that with a stock ct26. With an upgraded ct26 people have made close to 450whp. You can leave the manifold alone and upgrade the turbo to a 54 or 57 trim. If you go bigger on the turbo, you will have more lag. It's a trade-off of power vs spool. It will still spool pretty fast if you stick with the ct26. One way you can decrease lag is with head work, cams, and cam gears.
Last edited:
Yep. That is the most basic theory of big bore/short stroke engines. Lowering the piston speed increases engine life.
If you're trying to squeeze all that power get an inverted divorced DP, meaning it comes up from the turbo and goes out of the hood (yeah u'd need to cut a hole), loud yes, impractical, YES, but Fun? HELL YEAH hahahahaahahahahahahah of course then would it still be a downpipe since it goes up?
Adjuster
Supramania Contributor
I've ported two stock manifolds, not sure it's worth any more power, even with the bolt on T4 based turbo's...
Stock manifold has each port running into the other, and some at terrible angles and such. There are also casting flaws, and rough areas that can be smoothed out some, but it's pretty impossible to reach every inch of the inside without some flexable fittings... That don't exist in my knowlege... LOL
Porting the exhaust housing on the turbo has more benefit? (Just smooth it out, and your waste gate hole corner are all gains in my opinion. (You can even open up the WG hole slightly and get better flow and no spikes if your running a larger compressor wheel...)
Coatings are worth more than any porting job on the stock stuff. Keep the heat inside the manifold and exhaust housing, and it will make your engine run cooler, and improve flow etc.
Nothing quite like opening the hood for the first time when you have coated your exhaust and turbo, and finding the blast furnace effect is gone...
Stock manifold has each port running into the other, and some at terrible angles and such. There are also casting flaws, and rough areas that can be smoothed out some, but it's pretty impossible to reach every inch of the inside without some flexable fittings... That don't exist in my knowlege... LOL
Porting the exhaust housing on the turbo has more benefit? (Just smooth it out, and your waste gate hole corner are all gains in my opinion. (You can even open up the WG hole slightly and get better flow and no spikes if your running a larger compressor wheel...)
Coatings are worth more than any porting job on the stock stuff. Keep the heat inside the manifold and exhaust housing, and it will make your engine run cooler, and improve flow etc.
Nothing quite like opening the hood for the first time when you have coated your exhaust and turbo, and finding the blast furnace effect is gone...