To Twin or not to Twin...THAT is my question!! - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 33 Old 05-05-2016, 10:43 AM Thread Starter
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To Twin or not to Twin...THAT is my question!!

OK guys, help me decide the fate of my poor little street Mustang...

Here's my combo, so you know what I'm working with:

Man O War 331 short block with all forged stuff, 8.8 to 1 compression

Eddy Victor JR heads, healthy turbo hydraulic roller cam shifting at 6800 rpm

Rossler TH400 with PTC converter, 3.27 gears

Currently running a single PT76GTS turbo. Last year car ran [email protected] with 18 psi...I'm guessing the car might squeak into the 8s maxxing the 76mm turbo out on race gas. Who knows???

My issue is that I don't want to go to a mid frame turbo like a borg warner because I just don't have the room for the big down pipe among other things that would have to change.

I'm considering selling my current single kit and purchasing a twin turbo kit to get my car solidly in the 8s...8.50s?? and still be a true street car like it is now.

Are twins the way to go? If so, what size turbos?? Currently, I'm looking at two Turbonetics 6668 turbos, they support 700 hp each, which should get me to my goal of 8.50s with some room to grow.

Also, keep in mind that I will more than likely be going to a big bore 347 piston on my next motor rebuild.

It just seems like the turbo manufacturers all say a large single is more efficient than two small turbos, but I see some really fast street cars with twins.

Let me know your thoughts...sorry for the long post, but I'm ready to pull the trigger on a twin kit and would like some feedback from you guys.

Thanks!


93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

91 Notch 410W Novi 2000 5 speed...10.99 @ 136
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post #2 of 33 Old 05-05-2016, 11:45 AM
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It depends on what kind of classes you plan on racing. A lot of classes give better weight breaks to single turbo vs twin turbo cars. However, if you plan on just doing true street events, then the twin turbo won't hold you up from that.

Twin 66s can make GOBS of power. Using 6766s, my buddy got his convertible 4.6 car into the 5.0x @ 140ish mph in the 1/8 on an 8.5 tire, and around 3400 lbs. It shouldn't have an issue getting you to 8.50s in the quarter.


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post #3 of 33 Old 05-05-2016, 12:08 PM
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Where will you mount the one large one vs the two small ones? If you mount them low you'll need a scavenge pump if you mount them high you wont.

It will cost more to go twins b/c you need two of everything and the piping doubles and the room to fit it all in there gets cut in half. Going twins means you have to find room to run two sets of piping and there may not be enough room or you will have to snake all the hoses/lines through the piping on both sides. If you run one turbo then you can run the one set of pipes on one side of the car and all the necessary lines/hoses, etc on the other side.

By the time I finished my custom twin install I wish I had one turbo to deal with BUT twins sure look a lot nicer than a single.

Overall I think twins will be the best for what you want to do, though.

ks


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post #4 of 33 Old 05-05-2016, 02:56 PM Thread Starter
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Originally Posted by Joyrider564 View Post
It depends on what kind of classes you plan on racing. A lot of classes give better weight breaks to single turbo vs twin turbo cars. However, if you plan on just doing true street events, then the twin turbo won't hold you up from that.

Twin 66s can make GOBS of power. Using 6766s, my buddy got his convertible 4.6 car into the 5.0x @ 140ish mph in the 1/8 on an 8.5 tire, and around 3400 lbs. It shouldn't have an issue getting you to 8.50s in the quarter.
No class racing for me! Just good old fashioned bad Azz street car that hits the track about half a dozen times a year and frequents car shows. Thanks for your input!

93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

91 Notch 410W Novi 2000 5 speed...10.99 @ 136
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post #5 of 33 Old 05-05-2016, 03:02 PM Thread Starter
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Where will you mount the one large one vs the two small ones? If you mount them low you'll need a scavenge pump if you mount them high you wont.

It will cost more to go twins b/c you need two of everything and the piping doubles and the room to fit it all in there gets cut in half. Going twins means you have to find room to run two sets of piping and there may not be enough room or you will have to snake all the hoses/lines through the piping on both sides. If you run one turbo then you can run the one set of pipes on one side of the car and all the necessary lines/hoses, etc on the other side.

By the time I finished my custom twin install I wish I had one turbo to deal with BUT twins sure look a lot nicer than a single.

Overall I think twins will be the best for what you want to do, though.

ks

All great points for sure! And I've considered them all. I'll be having my buddy Jeff at Pony Down build me the kit. He places the turbos high, so no oil pumps. And with the positioning of the 3" downpipes and wastegates, it actually fits nicer than a large monster single turbo...on my car at least.

I guess I've already convinced myself that I want twins, but I'm not sure what size turbos. I don't want the car to have more lag than my single, but I also don't want the turbos to choke up with higher rpm. I was going to run .68 exhaust housing on two 66mm turbos. I'd like the room to grow with a big bore 347 next year and maybe a tight lash solid roller cam to rev it some more...maybe 7200?

93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

91 Notch 410W Novi 2000 5 speed...10.99 @ 136
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post #6 of 33 Old 05-05-2016, 03:41 PM
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I wouldn't guess. Get some specially made for your combo!
Give Brian Bissonette a shout and have him custom build you some. MUCH cheaper than anything off the shelf and this guy knows his stuff!

https://www.facebook.com/pages/Bison...854?sk=reviews

[email protected]


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post #7 of 33 Old 05-05-2016, 07:48 PM
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I sold my YSI and went twins. Way easier to package then a big single. I didn't want to deal with a 4" or bigger downpipe and where to route it. So I had a custom kit fabbed with the twins down near the fog lights on my 88 GT. I have Oiless turbos from Comp so no dealing with any scavenge pumps or anything. I say go for it man, especially on a street car. The thing I like the most now is how quiet it is. Idles and sounds like an NA H/C/I 302.

Just your average Fox sitting on Forged Wheels and looking for a 9 sec pass!
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post #8 of 33 Old 05-06-2016, 02:55 AM
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Yeah, my builder wants to do twins because he says it's simpler, but I already have(most of) a single kit waiting to go on. I'm gonna run the single, but may upgrade to twins whenever I get back to making good money. Just wanna get this damn thing done already!
I'd think twin 66's should easily reach your goals.
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post #9 of 33 Old 05-07-2016, 02:31 PM
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Quote:
Originally Posted by Vorteched88GT View Post
I sold my YSI and went twins. Way easier to package then a big single. I didn't want to deal with a 4" or bigger downpipe and where to route it. So I had a custom kit fabbed with the twins down near the fog lights on my 88 GT. I have Oiless turbos from Comp so no dealing with any scavenge pumps or anything. I say go for it man, especially on a street car. The thing I like the most now is how quiet it is. Idles and sounds like an NA H/C/I 302.
I've heard a ton of negative about the oiless. Yours doing ok? No experience just what I've read!
I think twin 76s would rock......
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post #10 of 33 Old 05-11-2016, 08:29 AM Thread Starter
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Well folks, I've settled on twin Turbonetics 6668 turbos...should be good for 1400+ horsepower. I'm guessing that once my I get my tune dialed in with the new twin set up, I should be solidly in the 8s with about 18 psi...which leaves me room to grow in the future with more cubes and/or more boost...25 psi? 30 psi? 100 psi??


93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

91 Notch 410W Novi 2000 5 speed...10.99 @ 136
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post #11 of 33 Old 05-16-2016, 04:05 PM
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Oiless turbo review?
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post #12 of 33 Old 05-16-2016, 09:35 PM
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Sounds good. Nice turbos.

Two turbos and a carb...
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post #13 of 33 Old 05-17-2016, 04:39 PM
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I think you will like it. I'm in the middle of going from a single kit to a twin kit in my Lightning. I'm more street than anything and the more I read about twins on the street and how much more streetable they are than a bigger single the decision was made. The kit I have was made by Pony down custom for our trucks. I'm running twin Comp billet 67's with .81 housings. I also switched out the stock blocked 383 for a 412 ci Dart Iron Eagle motor I just built. Should be done in a few weeks.

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post #14 of 33 Old 06-03-2016, 08:50 AM
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I think you will like it. I'm in the middle of going from a single kit to a twin kit in my Lightning. I'm more street than anything and the more I read about twins on the street and how much more streetable they are than a bigger single the decision was made. The kit I have was made by Pony down custom for our trucks. I'm running twin Comp billet 67's with .81 housings. I also switched out the stock blocked 383 for a 412 ci Dart Iron Eagle motor I just built. Should be done in a few weeks.
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post #15 of 33 Old 10-19-2017, 01:56 PM Thread Starter
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A long overdue update...

My car just ran two 8.50s in a row a few weeks back at 18 psi through the tailpipes on 275 DR's! I'm real happy. Should I turn the boost up more and go for a 7 second pass?
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93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

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post #16 of 33 Old 10-20-2017, 07:42 PM
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My car just ran two 8.50s in a row a few weeks back at 18 psi through the tailpipes on 275 DR's! I'm real happy. Should I turn the boost up more and go for a 7 second pass?
Now THATS an update!! That had to feel damn gooooood!
Huge Congrats!!


ks
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post #17 of 33 Old 10-23-2017, 03:47 PM Thread Starter
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Thanks a bunch KEVIN$! It definitely feels great! The car is ridiculous! I love the rush!!! Now I need more cage and a chute, etc...the track officials weren't real happy! Haha!

93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

91 Notch 410W Novi 2000 5 speed...10.99 @ 136
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post #18 of 33 Old 10-23-2017, 09:09 PM
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Thanks a bunch KEVIN$! It definitely feels great! The car is ridiculous! I love the rush!!! Now I need more cage and a chute, etc...the track officials weren't real happy! Haha!
A few more years and hopefully I'll get mine down the track..still stocking up on Depends undergarments.

Did you ever switch to E85 or do the flex fuel setup?

ks


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post #19 of 33 Old 10-24-2017, 07:38 AM Thread Starter
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A few more years and hopefully I'll get mine down the track..still stocking up on Depends undergarments.

Did you ever switch to E85 or do the flex fuel setup?

ks
Hahaha! I hear ya on the Depends...I've wanted to let off before the end of the track a few times...down right scary fast on the top end!

I decided to just run C16...it's very reliable for my combo, and although it's expensive, it's readily available for me. I only drive my car to a few car shows here and there and take my wife for "terror rides" sometimes! The rest of the time it's a 1/4 mile at a time.

Hang in there man...I can't wait to see how your machine works out at the track for you!
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93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

91 Notch 410W Novi 2000 5 speed...10.99 @ 136
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post #20 of 33 Old 10-24-2017, 08:12 AM Thread Starter
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8.54 Video


Here is the video of one of my passes...check it out!
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93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

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post #21 of 33 Old 10-24-2017, 06:28 PM
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Car looks nice and solid going down the track, great job!

ks
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post #22 of 33 Old 10-24-2017, 09:45 PM
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There are cars that look and sound fast, and then there are fast cars......well done.
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Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
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post #23 of 33 Old 10-25-2017, 09:57 AM Thread Starter
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There are cars that look and sound fast, and then there are fast cars......well done.
Thank you Sir!!

93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

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post #24 of 33 Old 10-25-2017, 11:35 PM
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That video was awesome.
Car looked like it went down the track on a rail. What's your suspension setup?

Also, please thank whoever took the video. Steady the whole way. I hate those videos that look like someone's 4 year old daughter was holding the camera. Makes you feel like you're going to throw up by the end of the video.
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post #25 of 33 Old 10-26-2017, 08:39 AM Thread Starter
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That video was awesome.
Car looked like it went down the track on a rail. What's your suspension setup?

Also, please thank whoever took the video. Steady the whole way. I hate those videos that look like someone's 4 year old daughter was holding the camera. Makes you feel like you're going to throw up by the end of the video.
Thank you TaraFirma. I am very fortunate that the car glides down the track like a Cadillac! I have a mess of stuff in the suspension:

Up front: UPR K-member, Viking double adjustable front struts with 175-14 coil overs
Out Back: Team Z relocated Upper control arm kit, UPR lower adjustable control arms, Viking double adjustable rear shocks, Team Z rear drag springs, ARB that clears 3" tailpipes

My wife deserves the credit for the videos...I'm not sure how she even keeps up with the car going down the track. I tried to video my buddies mid 9 sec car and lost it instantly!

93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

91 Notch 410W Novi 2000 5 speed...10.99 @ 136
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post #26 of 33 Old 10-26-2017, 10:37 AM
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Maybe install a ARB next. It will make the car launch level instead of hiking up the left front.

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #27 of 33 Old 10-26-2017, 01:27 PM Thread Starter
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Maybe install a ARB next. It will make the car launch level instead of hiking up the left front.
My car has had one for years...the car would fly right off the track without it. It launches straight, I just have my front strut rebound loose so it hikes the whole front end up most of the way down the track.

93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

91 Notch 410W Novi 2000 5 speed...10.99 @ 136
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post #28 of 33 Old 10-26-2017, 02:26 PM
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I did not see the ARB listed in the rear suspension stuff. In my car, I tie the front end down by about 2". I set the front struts about 5 clicks from full tight (20 clicks from full loose to full tight). Anyway, it is obvious that you have your set up working for you.
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1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #29 of 33 Old 11-01-2017, 02:46 PM
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Damn! Good job Radrick50. Very impressive.
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post #30 of 33 Old 11-02-2017, 01:46 PM Thread Starter
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A solo run...you can hear the car better on this one.


93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

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post #31 of 33 Old 11-03-2017, 11:49 AM
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I ended up going with the Borg. I did a 4" DP, but I ran it all the way to the back bumper to maintain the sleeper status.
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post #32 of 33 Old 11-03-2017, 12:50 PM Thread Starter
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I ended up going with the Borg. I did a 4" DP, but I ran it all the way to the back bumper to maintain the sleeper status.
I had a real nice Midwest Turbo Billet S483 turbo that I probably would have done what you did if it hadn't sold...I'm real happy with my twin kit though. How do you like your Borg? What kind of power are you making now?

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post #33 of 33 Old 12-04-2017, 05:52 PM
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I had a real nice Midwest Turbo Billet S483 turbo that I probably would have done what you did if it hadn't sold...I'm real happy with my twin kit though. How do you like your Borg? What kind of power are you making now?
I like the borg a lot. It's the only "big" turbo i've had in the last 10 years so it's a lot better than the old school stuff we used to run. Feels like it lights up instantly. I've got a tight converter and it's making good steam at 2500. I made 630 to the tire on 17#.
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