You won't get an argument from me. The most important area of a turbo exhaust system is the down pipe. As the exhaust leaves the turbine it is in a spiral. Which can just spin around the ID of the down pipe. In this case, it spins a lot but doesn't move toward the exit.

With a large diameter down pipe this spiral motion transforms into turbulent flow. Which then moves through the exhaust and out the exit.

Note that the intake side has the same issue...

RBob.

 

THANK YOU RBOB. I got flamed for suggesting exhaust a while ago. When it comes to turbo cars, they need bigger exhaust than n/a.

 

i didnt miss the point i fully understand that u have more range of readings over the same 0-5volt signal

the larger the table the easier it is to tune with less resolution is what i was getting at and i was curous as to how mig the tables are in the 58 & 59 code

 

no argument form anyone here really we told him a while back he should have a 3inch he knows this but its just not in the cards for him to do at this time, thats why he installed the cutout


with a turbo there is really no such thing as to big of a downpipe

 

All good insite guys. I really do appreciate it as im always open to learning more.

Just got back from the track. I now know what a boosted launch feels like! Its awsome! 2.04 was the best 60ft time and was 3psi at the launch. The times were 14.11 and 14.12, as the car was sticking rich at the top end. My wastegate DC was still off as it was overboosting at the end thus my tuning (over 12.5psi) isnt so dialed in yet. I had afr's in the very very low 11's for the better part of the run when boost was going over 12.5psi. But I was on a points race so I didnt want to tune it and mess up what I had going. So I just kept running the soggy rich tune.

Of course I red lighted with a -.051 IIRC at elimitations but the reason way, was that I was literly getting pushed by the turbo spooling. So I went too far into the beams and redlighted. I know on this run I launched @ 2700rpms, and there was more then 3psi guarenteed but because I didnt data record the log theres no way to be sure. That yeilded a 2.06 60ft time.

Ill add some pics, the one datalog and slips in the morning.

 

I didnt flame you did I?? I just said that that exhaust is all I could do with what I had going. Remember im a total newbe at all of this stuff, there is ALOT of things I would change if I could do it over again. Its just a learning experience.

 

No you didn't, others did.

IF you ran a 3.5"+ exhaust, that turbo would spool hard and fast.

I have built many boosted 4 cyl cars. And even on those with a 50 trim. 2.5" was way to small. 3" was the bare minimum. But I didn't un-cork it for the strip, didn't need to. My last DSM was tuned on 104 octane @ 24psi of boost. I would smoke all 4 tires through 2nd and was still cutting 1.7 60ft times.

But boosted applications, I only have experience in 4cylinder cars.

 

In due time I want to redue all of the exhaust as it is holding me back a bit. I need to get on making up a turbo header and start thinking of how ill run the down piping arround the firewall so its not under the k-member. But I think that will be a winter project.

Also im 27. I wish the pickers were coming to my house. So I can get more $$ for car parts....

 

Haha, I hear that. I am only 26. This '83 camaro is my 48th car LoL. I wish I still had most of the others though.

I thought it was funny though, I was reading this thread, when they were picking at FastEddies place. He was an OLD timer though haha.

 

wow your 48th car. Thats alot man.

Nice to know people are checking this thread out. Im sure I asked alot of dumb questions that will be helpful for newbes at this.

 

Ya, well through High School I would go to auctions and buy 3 or 4 cars and fix them to sell. i didn't have many "real" jobs back then. Now it's just a hobby to buy,fix, sell. but I am getting sick of doing it. So I am building them for myself now.

You are doing a good job man. I have been watching this thread for quite a while. It looks good.

 

every notice how those jacked up diesel truck have monster hugh exhaust??? Do you have a cordless sawsall???

 

LoL.

But really, I bet a guy could go find a stock diesel exhaust system at the boneyard and make a pretty good setup out of it for cheap if you have a welder.

 

What I had in mind

for under body room ya could put something inside the pipe and "lean" on it to oval it but not crush it.

 

LOL youre not going to find a solid exhaust in the saltbelt.

 

Nah, Ground clearance is over rated anyways, haha.

 

how soon would u like real turbo headers?

 

I never flamed you before, but I will somewhat sound like I am flaming you now because you are wrong. First of all, do you even know what his exhaust pressure is to suggest that if he ran a 3.5" dowpipe his turbo will spool hard and fast? Was his exhaust pressure even measured yet, before, and after the turbo? Went to the track yesterday, and my good friend's Grand National ran a best of 10.15 @ 134, with a former best of 10.42 @ 127, he stepped upped to a slightly bigger turbo size, and kept the 3" dowpipe. Show me how fasteddi's smaller engine will benefit from a 3.5" downpipe...

 

I think 3 1/2" may be a tad over kill on the lil v6 as I was thinking 3inch would do fine.

@dave I want some turbo headers today..lol

Here are a few slips, cant find the other one I had. Also I added the one datalogg of the first run. I launched good but spooled up better on later runs.

In the datalogg when I over boosted to 13.5psi and higher the injectors maxed for a quick second and made the car stinkin rich, i literly felt it slow down just before the 1/8 mile. 11.3 -11.6 afr's the rest of the way to the traps. That needs tuned this week!! Id would have liked to see what the car would have ran with 12.0-12.3 afrs the whole way down the track and a solid 12.5psi? I definitly picked up the best 60 and 330ft times Ive ever ran last night. Those slick really hook now. And I know I can push the launch just a tad more.

My perm car number on the weekeds is car # 191. Anyone guess why i picked that number??



I wasent trying to sand bag here, but my car went a 14.32 the time trial before as it was very hot out and it was even more rich. As you can see I went 14.11..opps but I redlighted. But I was always tough you have brakes not nitrous so why dial a number lower then your last run...

And the other car on there was a 95 cobra mustang that I beat on times. Its nice beating up on a V8 stang!!!

 

Engine displacement in cubic inches...

RBob.

 

 

Not sure, but hopefully it doesn't end up like Flight 191, very unlucky number in the plane world...

 

pm me and we will work something out, for a set like i did on pilsburys car

 

Listen here. What part of "I DONT WANT TO START AN ARGUMENT" Did you not understand? Oh, and your friends GN did that? What about your boosted car, huh?

If you ran 3" from the turbo to the end it would help the turbo spool, that is what I did on my damn 4cyl car running 24psi there bud. It helped. I even said that was the only experience I had. THAT WAS A 2.0 LITER 4 CYLINDER.

I had a 3" downpipe, no cat, and 3" mandrel bent cat-back. AFTER I had a full 2.5" system. And even on that 4cylinder car. going from a full 2.5" mandrel exhaust. To the full 3" was a HUGE difference in how the Turbo responded.

Go start a pissing match somewhere else. I am not telling this guy what to do, I am just giving suggestions. He is having a hard time building boost, and it is very laggy. Ya, there are other variables in that. Like engine, turbo size, intercooler and piping, Intake etc... But exhaust is cheap and makes a big difference.

If you have any suggestions, or positive comments, please, lets here them. But leave the BS pissing match elsewhere. k thanks bye.

Oh, and just one last thing, just because your buddy did this, with that setup. And ran so and so time. Doesn't mean it's the ONLY way to do something, or the best way to do something. I ran my car with stock exhaust for a while, ya the turbo still spooled, But when I did the 3" it was way better.

 

Street Lethal is just like that, he uses what his friends cars do or don't do as gospel, I recall him being "done with this thread" a couple times now, anyway.

But lets not let this thread get off topic.

A turbo works on pressure differential (as well as heat). so the less restriction there is on the outlet side of the turbine (with a smooth transition from the turbine wheel to the outlet), will allow a quicker spool.

There's no debate that the exhaust that is on Fasteddi's car is hurting him, at least 3" will be a great improvement over the current exhaust system.

On my own car, I would have gone 3.5 or 4", if it was more cost effective. I was able to buy 3" J-tubes pretty cheaply, so I went that route, I also had a 3" Moroso Spiro-Flow muffler already, so that helped make the decision for me.

In some cases going straight to the 4" or so exhaust right off the turbine can cause issues, due to turbulent flow, but using a taper of the right length and transition will help keep the flow smooth and allow for as little back pressure as possible.

 

Thank you Six Shooter.

I am not going off of my friends did this or that, I am speaking from MY experience. And like I said, that was strictly 2 liter 4 cylinders.

I am not claiming to know anything above or beyond that.

 

in the case of fast's turbo the turbine outlet is 2.5 inches same as my first 50 trim and my t3/60-1 turbo i rolled a cone that transitioned from 2.5 to 3.0 inch for my ex system changing from 2.5 inch to 3 inch made a huge difference on my motor

and as six i would have liked to have gone 3.5 or 4 inch but i had 3 inch stuff laying around

 

Ive got the fat line going through the stock reg, to the rail, then the thin line on the top going into the afpr and back to the tank.

Ill go back out and mess with it but this is beginning to drive me nuts hooking up the afpr

 

u have the right line fast, but u need to clamp that much much better as that side of the line will see whatever u fuel presure is set to so say 60psi + another 12-15 psi with boost

i need to see a picture of the regulator u are using i think u have the in and out lines on the regulator backwwards

 

Yea I ran out of those high press t clamps. I will pick some up in the morning before I drive it. I do have the bottom outlet of the AFPR going back to the fuel rail, and the side of the AFPR going to the fuel tank.

THis is easier then running out side. heres a pic of what I have

 

try reversing the lines in the afpr and see what happenes

 

Well you got it, I just had the lines on the AFPR reversed. It fired up and made psi when I cranked down on it. Set it to 40psi for the moment, with no vac reference on either the stock or the new regulator.

Can anyone elaberate on what the setting would be for the afpr to be set to the stock pressure? 43 at idle? Does it drop? Or only drop without the reference line?

 

disconect the refrence line and set it to 43psi @ idle once u hook up the refrence line the fp will drop

since u are maxing ur injectors do the above but instead of 43psi set it to 55psi ( the car will run rich as hell at idle) then reconect the refrence line (to the new afpr only) and then go back and burn a new chip with the injector constant adjusted till the car idles like its supposed to

 

Ok will do. Im going to pick up more of those hi press. t clamps tommorow, then dial in the pressure and make up a extention vac line for the reference on the new AFPR. Thanks!

 

np man yw,make sure that line is clamped very well , it will see fuel presure of almost 80psi if u have a flare tool id flare the end of the steel line a lil bit to make it harder for the hose to slip off once clamped

 

That flare is a good idea. Yea I got one, so I'll get on that also. Good thinking man, dont wana burn my car down.

 

Alright guys, you all know my turbo set up isn't the best. We can all agree on that. You have to remember that im not the best at automotive applications since im a newbe at tuning and all the common knowleged involved in this project. Now you guys argue alot, and I feel that I start the problems unintentially. That this is a 32 page thread so far. There is a TON of great info on here. Really Id like to keep the knowledge coming, theres nothing wrong with arguing theorys as long as it doesnt get personel.

Yes I respect all of you alot! Rob, sold me the injec, and has helped alot alot over the last 6 months, including helping me learn about the 700r's with pro build trans, Ill never forget that. Dave you have helped a ton with your knowledge of the 2.8/3.1L turbos you have worked on. Same with you Joe. And Sixshooter knows his stuff on $59 which without him I'd be lost on that along time ago. Rbob is a tuing guru also and has helped greatly. You guys are the reason my car is still alive and making 14 flat passes on stock suspention, internals, and so forth. Not one person by themselfs could have made this build turn out like it did, it took all of you to make a newbe like myself understand the concepts and keep the car in one piece!

Don't let some argueing ruin a great base of knowledge. You guys are the best there is on this V6 forum and I dont want that to end anytime soon. We all have areas that there better at and thats what make this forum stay alive and active.

Ok now that I gave my 2 cents can we get back to business and keep this turbo thread going in hopes of this lil sixer continue down the track for years to come?

 

Fasteddi, car looks great. You are getting there. and you are learning. That's all that counts, o wait. Are you having fun? 'cause that's what really counts.

Street lethal. Just leave, nobody cares.

Can we all just agree with you so that you feel like you won and then you leave?

 

if ur jelous now just wait i have a funny feeling he will have a much nicer turbo system soon

 

i believe it LOL

 

It seems that there are certain members who can't leave this thread alone and start personal attacks on others because their opinion is different.

This may come as a surprise to some of you, but, moderators have opinions and are allowed to share them too.

This thread stays locked.

 

this is what fasteddi may end up with soon











or he may end up with a set like i did on pilsburys car

 

and the 2 i couldnt include before