First Attempt At Twins...

[AHineman]

Still got a lot of work left to do.
Here are some pics of my progress so far...
S300G over S475
http://i809.photobucket.com/albums/zz16/AHineman1stgen/DSCN0077.jpg
http://i809.photobucket.com/albums/zz16/AHineman1stgen/DSCN0078.jpg
http://i809.photobucket.com/albums/zz16/AHineman1stgen/DSCN0079-1.jpg
http://i809.photobucket.com/albums/zz16/AHineman1stgen/DSCN0080.jpg
http://i809.photobucket.com/albums/zz16/AHineman1stgen/DSCN0082.jpg
http://i809.photobucket.com/albums/zz16/AHineman1stgen/DSCN0083.jpg
I know, the hot pipe is pretty long, but I'm hoping that since its schedule 40 and going to be header wrapped that it will hold enough heat.
Most of the people I have shown the pics to are like "what was wrong with it before?", or "why not put just one big turbo on it?"
If they have to ask, they probably wouldn't understand anyways.

[ellis93]

I don't have a clue about twins but it looks cool. What's it sound like? I like the truck too. Its got the sleeper look.

[AHineman]

Thanks for the compliments.
I don't have enough done to start it...still waiting on some 2.5" tight 90s to make the pipe going to my intercooler. I also have to make a mount for the big turbo, make the piping going to my air filter, put a turnbuckle on my wastegate, paint piping, etc.
The sleeper look is what I'm going for. Some people love it, some hate it...but if you pulled up beside me at a red light would you think it had twins,a ported head and 6x16s?

[delinquent]

It looks super. Do you have a support bracket for the 475? If not, I'd add one.


on edit, I didn't read the part where you were going to build one! Nice job

[ellis93]

Its wonderfull to bust some young punks a_s in his ricer in somethin that looks like that.

[Richie O]

Well I don't have a clue what works, or does not, but that looks pretty good to me. If I ever have twins it will be home made as well.

[Mark Nixon]

I've never looked closely at a twin set-up before this, but I'd almost do it just to confuse some of the idiot know-it-alls around here!

I'm a huge fan of that shade of green, you don't see many diesel-era 1st Gen bodies that color.

Mark.

[dvst8r]

It will work just fine.

I normally try to set my primary back a little further in order to just do the 90* and then straight down into the primary, but you will have no issues at all with the hot piping. Especially if it is wrapped.

Where are you taking your support bracket from? I.e: drilling and tapping the boss's on the block, or off the holes in the flat part of the engine mount, and the holes off the bellhousing? or?

I have seen it off the frame, the thing you need to do there is have the mount flexible, which is a huge pita, my advise is to not mount it from the frame.

EDIT:
Before you take it for a run, use an air compressor with a regulator to set the gate so that it is fully open by ~ 25psi. It will still take some tuning after you get them exactly right using total boost pressure, vs primary boost, vs drive pressure, but that should get you close.

Pressurize the cold side using a cap over the primary and an air compressor with a regulator (about 20psi is all you need) before you ever go for a run, get rid of the boost leaks first. It will make having twins so much better, and be so much less of a headache. It took me about 3 sets of twins to learn this lesson, but 95% of the 11 sets of twins I have built have had some sort of leak right off the bat, and some have been not even where I touched them, like up at the air horn or intake plate.

The hotside you can normally see after a couple runs if it is leaking, as the soot will tell you where the hole is.

Finally that is a hot looking truck I love the sleeper look.

[AHineman]

dvst8r, thanks for the pointers. I plan on attaching the brace for the primary on/by the motor mount. Between overtime at work and being on vacation right now, the truck hasn't got much attention for the past few weeks. Hopefully it will be back together soon!

[AHineman]

A few more pics...
http://i809.photobucket.com/albums/zz16/AHineman1stgen/DSCN0093.jpg
http://i809.photobucket.com/albums/zz16/AHineman1stgen/DSCN0089.jpg
http://i809.photobucket.com/albums/zz16/AHineman1stgen/DSCN0088.jpg
http://i809.photobucket.com/albums/zz16/AHineman1stgen/DSCN0087.jpg
http://i809.photobucket.com/albums/zz16/AHineman1stgen/DSCN0090.jpg

[ellis93]

Is it runnin yet

[AHineman]

Not yet, but soon...
Waiting on some pipe to make a downpipe, oil drains, and I've got to make the brace for the s400 still.
Not got alot of time to work on it. You guys know how it is...
You'll be the first to know when I fire it up, unless you count all the neighbors.

[Tacoclaw]

Just to necro the crap outta this, I just got back from Andrew's after he took me a ride in his truck.

His computer died, so he hasn't updated this, but his twins are completed and running. There's a couple of little bugs he needs to work out, like a leaky hot pipe clamp, but it runs damn good.

He was having some problems with low boost, since it was pegging his 60lb boost gauge right off of cruise a couple of days ago. Something went wrong with it and it only hits about 52ish on a full out run and doesn't run nearly as well, but at 52lbs that thing scoots. He's taking it back apart tomorrow to clean up the soot from the leaky clamp and double check all his piping and lines.

Lag was barely noticeable and only slightly longer than my truck with a 62/65/12.

This was the last thing I needed to ride in...

*starts pricing piping*

[AHineman]

Sorry for dropping the ball with this thread, I hate trying to post with my phone...pics suck with it too. So Ill have to post them at a later date. Found the reason for low boost. The exhaust leak gave me homemade egr. The airfilter was clogged with soot and had colapsed. The prefilter hid the damage. I need to get the rest of my gauges, no word on drive pressure or boost from the primary yet, but overall boost is pegging the 60psi guage fairly easily. Pyro is happy too with a max of 1250 while brake torquing the heck out of it in third. Normal flogging never gets it hot at all. Less than 1000 degrees at top end of the speedo. I'm happy with it, but still need a better fuel system, etc. etc.

[KTA]

That looks nearly identical to my twin setup on old yellow. Only diffrence mine being a 62/71 s300 over an hx60 but the mounting pattern is the same. Did you tee your oil drains together like I did as well?