[sam o nela]

Amen to that one Jarryd...also, we had a turbo version in Japan and someone here from Down Under mentioned that the "Exclusive" Legends over there had not only turbo versions, but also things like rear A/C vents, rear cup holders in the arm rest, and some other stuff I cant remember....so the USDM Legends have MINOR luxury when compared to some of the stuff offered in other parts of the world.

And dude theres seriously nothing wrong with a High powered luxury ride (ala 7 series and S class AMG). In fact for the day (1986) 151 Horsies was pretty up there when compared to other stuff on the road at the time (id say average was from 98hp-130hp for the era)

 

[88_acro]

have you heard of turbo lag it will make you slower off the line and there are some civics and integs round my way that will smoke most cars on this forum

 

[Jarryd]

yeah see ricers never race me when i drive the porsche (gold car behind the legend) But in the legend you can be in full luxury and have just enough power to smoke poeple at the lights. thats all i need. also if they didnt want me to enjoy the car so much they wouldnt of given the legend such a powerful engine.

 

[Jarryd]

have you heard of turbo lag it will make you slower off the line and there are some civics and integs round my way that will smoke most cars on this forum

Your right you will get turbo lag. but a smaller turbo should fix that problem

 

[sam o nela]

Actually our turbo version had a "Winged" turbo design which virtually eliminated turbo lag...but yeah I do agree with you...the lag is definitley the achilies (sp) heel in any turboed car..

 

[john bigonion]

I've been working on a twin turbo legend, the only way to fit a turbo under the rear bank is to cut the rear subframe, I don't want to do that. and as for headers, there is nothing out there and customs aren't worth it. Now if you change the down pipes, that will make a diff. I made mine 1 7/8" going into a 3" collector down to a 2 1/2" all the way back!

 

[Shai_Hulud]

Anyone of you guys know what kind of steel it is best to use when making headers? what thickness and what kind of welds? i am thinking of designing and machining one...

 

[john bigonion]

stainless is best, 1" or 27 to 28 mm, and tig welding will be the only way to weld that with any quality.

 

[slartibartfast]

Many flavors of stainless available. Typical for exhaust is 304. Some might use 316 but it's a bit more brittle than 304 and harder to work.

BTW, "stainless" is a misnomer. Every 304SS header I've ever had has turned colors due to oxidation of various surface crystals. My Bandit developed ugly purple and dark brown patches. It looked cool, at first, when the exhuast turned a lovely gold. Polish will remove this oxidation layer but it eventually returns.

 

[Shai_Hulud]

thank you. i will try to find me a header and take some measurements then. i`ll probably just use the gasket for the (head) connection surface. i haven`t had the time to look at my own headers since i bought the car just a few weeks ago. any treacherous bends in the header design i should know about beforehand?

i can post a few pictures when i am finished with the overall 3D design if you guys like, but please, if there are any definitive dos and don`ts involved in the machining (or designing for that matter) process, please tell! it would be cool if all of us guys could benefit from this..

hope they have got the new 3D printer where i study during the christmas holydays, then i could probably send a true model to one of you more experienced guys :bowdown: to study and comment..

 

[Shai_Hulud]

No one interrested in this..? hmmm..

 

[88_acro]

there is people interest but so many people have made the exact same comment you have and they never followed through then they respond with not me ill actualy do and they still dont follow through

 

[john bigonion]

I agree with 88, I am bad at that because I procrastinate alot. But if you want to make headers, there is a market, small but it's there. All I have made so far is a set of pipes coming off the exhaust manifolds with 1 7/8 going down into a 2 1/2 pipe all the way back. I haven't ran it yet, but soon.

 

[Shai_Hulud]

if you like, i can show you some of the stuff i have modelled so far.. (nothing exhaust related yet..) i have a fairly advanced machine shop where i study, so it is possible for me to make som really cool stuff. they have things like robot welder and stuff like that so.. but please, i need some advice, and some guidelines. i can machine most things, but i just need to know what!

 

[john bigonion]

send it. let me see what have so far!

 

[88_acro]

nothing needs to be machined you just need tubing, a tubing bender, a welder, a sheet of steel, and some basic know how its really not that dificult

 

[maytagman]

ive heard a good way to do it (from a friend who custom made a turbo manifold for his audi) is to use toilet paper/paper towel tubes and cut em and tape em together in the shape of the header... then cut metal pieces to match and fill it in a piece at a time..

 

[88_acro]

or take a welding rod and bend it to the shape you want then bend the tube

 

[Shai_Hulud]

Hey! that toilet paper roll trick aint bad.. anyway, we will be getting the 3d printer here in a short while! horaay! anyway, what i think is the most essential things in the design of a performance header is the following: as high as possible radius in the pipe bends, clean inside welds, equal pipe length (before merging into one). also, the way the three pipes (on each cylinder row) are "merged" into one is essential as i see it (i will use an NSX :bowdown: header as "inspiration" for the time being..). if you have any suggestions regarding the last point, please spill! will try to upload a picture in a bit..

 

[Shai_Hulud]

here are some pictures... just fast modelling. one pipe finished, but keep in mind that none of he dimensions or angles etc. are real life related.

i can also calculate mass properties, stress and pressure test it etc. etc... :****: