twin scroll turbo with log manifold

[roplusbee]

Cool beans. My plans may have taken a drastic change. Let me know how it all turns out anyway.

[White Comet]

^ yep i'll be updating my build thread and hoping to finish in time for the june 7th meet in philly. at the very latest though, the car will be done but the 20th sine thats the deadline my dad set lol.

[brizanden]

logan exhaust pulses interfeering is not a myth.... Jeff go pick up the new issue of modified mag or read it at a store. Cause there is a 3-4 page article describing exatcly how a log and twin scroll works. So go edumacate yourself and then do what you think you should.

[MOUNTAINATTACK]

My twin scroll H1c works fine on my non twin scroll log mani....

[White Comet]

logan exhaust pulses interfeering is not a myth.... Jeff go pick up the new issue of modified mag or read it at a store. Cause there is a 3-4 page article describing exatcly how a log and twin scroll works. So go edumacate yourself and then do what you think you should.

i've looked into a log manifold a great deal recently and am very confident i have nothing to worry about. as for twin scroll its no longer an issue for me to consider

[Logan76]

Explain to me how the exhaust interfere's then? I want actual test results man. How does the exhaust pulse from one cyl flow against one from the other, if the others exhaust valve is closed?

Log manifolds are'nt the best manifold design ever, but they'll sure as hell work and you can make over 400hp on them.

p.s. I've educated myself in boosting cars without spending my life savings, I don't need a twin scroll equal length manifold to make 400hp, and neither does WC.

WC, sorry about last night, I fell alseep while talking with my girlfreind. I'll catch you on AIM tonight, I've got a birthday party for my girl to go to now.

[sommmatt]

Just because a cylinder's exhaust valve is closed doesn't mean there's not air flow coming from the cylinder that just fired going toward the turbo, which is going to run into the current cylinder firing, causing both pulses to gain turbulence.

It's not like a cylinder fires, all of the exhaust gas gets used up, and the next cylinder fires. Revving these engines out to 6, 7, 8, 9000 RPM, the engine is going to open and close exhaust valves faster than that air can be forced out through the bottle neck (turbo).

[brizanden]

Explain to me how the exhaust interfere's then? I want actual test results man. How does the exhaust pulse from one cyl flow against one from the other, if the others exhaust valve is closed?

Log manifolds are'nt the best manifold design ever, but they'll sure as hell work and you can make over 400hp on them.

p.s. I've educated myself in boosting cars without spending my life savings, I don't need a twin scroll equal length manifold to make 400hp, and neither does WC.

WC, sorry about last night, I fell alseep while talking with my girlfreind. I'll catch you on AIM tonight, I've got a birthday party for my girl to go to now.

just cause log style or your building techniques work doesnt mean new greater things cant improve otherwise we would all be rocking huge big block v8s to make gobs of power.

[Logan76]

I agree' there are better manifolds out there, but you guy's act like you've never been on a tight budget before. Its either mig up your own stainless steel log manifold, or use an E-bay peice of trash and have it crack within two days. I love how everyone hates on the log manfiold but its proven itself over and over again.

[Logan76]

Just because a cylinder's exhaust valve is closed doesn't mean there's not air flow coming from the cylinder that just fired going toward the turbo, which is going to run into the current cylinder firing, causing both pulses to gain turbulence.

It's not like a cylinder fires, all of the exhaust gas gets used up, and the next cylinder fires. Revving these engines out to 6, 7, 8, 9000 RPM, the engine is going to open and close exhaust valves faster than that air can be forced out through the bottle neck (turbo).

I understand this, but that still does'nt discredit the log manifold. Your exhaust gasses have to flow alot further through an equal length tubular manifold, so do you really think that the turbulance in the log manifold is going to affect spool up time more than flowing 3x the distance?

[brizanden]

I agree' there are better manifolds out there, but you guy's act like you've never been on a tight budget before. Its either mig up your own stainless steel log manifold, or use an E-bay peice of trash and have it crack within two days. I love how everyone hates on the log manfiold but its proven itself over and over again.

i never said he needed a twin scroll i mearly suggested he read and decide for himself what he wants to do. It was a good little article i learned something .

[mrgreeneyes]

i never said he needed a twin scroll i mearly suggested he read and decide for himself what he wants to do. It was a good little article i learned something .

if money is that tight, dont upgrade your turbocharging system. seriously.

thats not knocking any one, but that just MAKES SENSE. my build's momentum has slowed due to my having to take a job i make significantly less at. it sucks, but im not going out trying to find the cheapest alternative, i just have resigned to the fact that it going to take longer cus i have to save up for parts.

[Logan76]

Maybe not everyone wants to drop that much dime, Log manifolds work. Period. It upset's me that everyone thinks since its not a bought manifold its junk. It's going to be all stainless, and if his brother can weld, strong. Money is tight everywhere, but maybe even if it's not tight, maybe some people dont want to spend 1000$+ on a manifold? Hell I can think of places a 1000+ would go me better, and its not as a manifold. (time on the dyno?)

I value all of your opinions, but I'm so tired of hearing the same old crap spewed on forums, where if its not the baddest a** thing on the market, its junk. That you should save your money and hold off on the project because of the fact that its not the best.

Making this log manifold is just the start, his brother can get some practice welding up this manifold and learning how to peice it together, then maybe he'll make an attempt at a better design? I'm a firm believer in making your own parts and saving your money.

[Didderson]

if money is that tight, dont upgrade your turbocharging system. seriously.

thats not knocking any one, but that just MAKES SENSE. my build's momentum has slowed due to my having to take a job i make significantly less at. it sucks, but im not going out trying to find the cheapest alternative, i just have resigned to the fact that it going to take longer cus i have to save up for parts.

BuBuBuBINGO!

Should have stayed stock for now, you may end up with yet another haphazard mod because of funding.

[Logan76]

400hp is 400hp. A manifold hardly makes something hapharzard. If he does Injectors/MAF/Tune, and a gt30r, how is anything about that haphazard? You guy's are over engineering a damn manifold.

I like all of you, but I'll argue this point until the end of time. I would say if he keeps his haed on straight and does the right supporting mods, and a not quite so "ballerific" manifold, there's nothing wrong with that.

[Didderson]

Well I should have been more clear. I don't think the log manifold is the problem. Sure he wouldn't be utilizing the 2scroll feature, but that doesn't matter as long as it works.

Maybe I just have this idea in my head that it won't look that good because it wasn't designed for the SR. I mean it's for a suby. Either way he needs a new probably custom hotpipe and custom elbow. Harder to make those look good but we will see.

Sorry for my negativity it may seem, but I really don't think negatively of this project, just skeptical. <Keyword there.

Jeff man, 400 hp with a non coilover suspension + ~205 tires, I fear for your life kinda. All I'm gonna say, because I know you're a crazy mothaf***a when it comes to driving lol.

[Logan76]

Ahh, you read wrong sir. The turbo is standard T3 inlet, not twin scroll, and has a t3 5 bolt outlet.

He will need a new hot-pipe though because the turbo will be top mount now.

I don't know if coilovers would help or not, lol. Coilover's for sure wont help him hook up, but the tires need to be like 305 not 205 LOL.

[White Comet]

alright it looks like some things need cleared up again.- its not a subbie specific turbo, its t3 in and t3 5 bolt out- its not twin scroll- to all those saying a turbo upgrade on a budget is a bad idea, i agree. i'm not doing this on a budget. i decided to scrap the idea of even having a budget last summer. all im saying is i see no point in getting a $800 manifold when i got the materials for $140. the plan was never to bolt s*** on haphazardly and pray, but to make wise choices with the parts i use. the mention of doing this for $600 was because thats the initial cash i had in hand. obviously thats not where i'm going to stop with it.- as for the 400hp goal, thats not for the immediate future. i would never try and produce that power without prepping the rest of the car for it. wider wheels and tires are a must for that power, but even though i fail to see how coilovers would help contain the power? unless i'm missing something.

[Didderson]

Why are coils necessary? Three word/phrases: squat, dive, front camber correction. You might know what i mean until you drive the car. I haven't driven a 400hp car with that setup, but looking back, I feel like a 200-250hp car was too much for it. Obviously I feel this way because i crashed it lol, and for other reasons.

The front camber correction is a huge reason to consider coils down the road, and I know u are before the full boost so that's good.

You shouldn't post a thread saying "twin scroll" turbo etc etc if it's not a twin scroll. You shouldn't say your turbo is brand new if it has exhaust gasses on it. Actually if it was only running for x amount of time it looks as if it was running rich to me, just saying.

Sorry I am confused, but the methods u use to communicate set sail for fail because it seems you don't even know what you've bought until 2days after the sale.

I don't mean to rip on u jeff but this is getting out of hand. I would like to opt out of this thread.

[Logan76]

How can you tell it was running rich from just looking an the exhaust wheel? Looks like carbon build up to me.

[White Comet]

how can you tell how the car ran through pictures? i already explained about the title of this thread. i made it before i went and looked at the turbo, its not like i already purchased it and couldnt tell the difference between twin scroll and regualr t3. and yes, once and for all the turbo is not BRAND NEW, i apologize for lieing, its seen a few dyno runs and no street time. i'm not trying to be a d!ck but your comments are getting annoying especially with the set sail for fail one. i've explained every point of confusion but it seems everyone would rather post without reading. i realize the importance of coilovers, but as far as high hp, you want a softer rear suspension for traction, coilovers won't do s*** for that. i don't think he dad is gonna have a problem keeping his chevelles on the road cuz he's not running coilovers. even as far as stability when cornering, i dont' think the strut/spring setup will cause any issues that lead to a crash. even though you crashed while running em doesn't mean coils would have saved you. as far as my driving, i'm not sure if your comment about it was a compliment or an insult, but i'm not worried about my driving at all.

[Didderson]

That amount of carbon build up = running slight rich.

My reasoning, because it was only in use for a minimal amount of time.

Stop talking on aim and asking the same questions.

take a look at my turbine and wastegate area and compare the buildup. It is only slight and doesnt matter much, but I can assure you my 15k+ mile turbine and wastegate area is cleaner than that turbo you have right thurr.

[Logan76]

There isnt even that much carbon build up on there, hell you can nearly see the metal below the carbon yet. All my turbo's have had so much carbon you can't see the metal anymore. I still would like to add, saying that the car ran rich, which we don't know if it did or not, would not have an adverse effect on that turbo.

Either way I told jeff to buy it, and if you can find a GT3071R for 350$ anywhere else in half the shape that turbo's in, I'll paypal you 2$ to go buy yourself a pepsi.

Even if he didn't have the $$$ to do the build right now, T25's are a dime a dozen for 100$ he could buy one and have his car running and hold on to the cheap GT30R. I sold my T25 for like 20$ to Matej a long time ago. lol

[White Comet]

Stop talking on aim and asking the same questions.

no idea what you mean by this