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Author Topic: Blow-thru's dont work!  (Read 10133 times)
Jim Mitchell
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« on: September 14, 2010, 09:59:39 pm »

Hehehehehehe just kiddin. I havent been around here in a while and thought it would be appropriate to keep you guys updated on my home-fabbed twin turbo build. I had the carb dialed in close in 3 passes and tuned the squirters, pump right in my driveway this spring. The motor has been running very well for what it is but the car has been a nightmare to get down the track. Part of the problem with the car is Im just waaaaay to cheap to go buy the right suspension pieces so I have been improvising and finally got a combo that is working. The front suspension is completely stock, the rear is stock except for a set of UMI lower control arms and I stuffed a football inside the right rear coil spring and inflated it to 8 psi. I borrowed some barbell plates from my weight bench and bolted them to my rear bumper for a total of 150#. The car does 1.4X 60' times and has run a best of 6.34 @ 110 mph with 9 pounds of boost. The car weighs 3198# with driver. I run an old set of used Hoosier circle track tires with 11 psi.
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Homemade twin-turbo 302.
Jim Mitchell
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« Reply #1 on: September 14, 2010, 10:01:16 pm »

Here are a couple of mid 6 passes @ 107.4 mph http://s263.photobucket.com/albums/ii137/Mitchell302/?action=view&current=102_3892.mp4  http://s263.photobucket.com/albums/ii137/Mitchell302/?action=view&current=102_3888.mp4
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Homemade twin-turbo 302.
Jim Mitchell
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« Reply #2 on: September 14, 2010, 10:02:43 pm »

Here is my last pass I made before the track officials told me to slow it down or pack it up. 6.34 @ 109.5 mph. http://s263.photobucket.com/albums/ii137/Mitchell302/?action=view&current=102_3893.mp4
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Homemade twin-turbo 302.
69 Merc
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« Reply #3 on: September 14, 2010, 10:14:45 pm »

Here is my last pass I made before the track officials told me to slow it down or pack it up. 6.34 @ 109.5 mph. http://s263.photobucket.com/albums/ii137/Mitchell302/?action=view&current=102_3893.mp4


Wow!!


The other car took you off of the line pretty good but it looks like that at the end you almost beat him, huh?
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 2" aluminum open spacer, CamMotion HR .624/.609 251/256 108, 1-3/4" x 3" headers, Broader Performance RmV/B under a C6/4R100 behind a 8"/9" billet 5500 stall, 9" 4.56 Detroit Truetrac, M/T ET radial streets 315/60-15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html

Irwindale Speedway 1/8 mile (1st time at a track!) = 7.647 @ 90.78mph with a crappy 1.878 sixty foot (3850# race weight)

Present day Merc = http://sbftech.com/index.php/topic,34648.0.html


Except that engine building (properly) is a labor intensive industry.  Who do you think does all the measuring and machining?  Little engine shop fairies?  Not to mention assembly, mock up and parts fitting.

At Woody's level you are not just paying for his labor but for his skill set as well.

Thanks FordStrokers 408W, Westminster Performance Transmission (W.P.T.) transmissions, TCS Performance converters, Broader Performance valvebodies and last but not least a BIG thanks (always) to my friends here and abroad in the World!
fogged306
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« Reply #4 on: September 14, 2010, 10:25:44 pm »

Is that a football?
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Trevor

Don't mistake any of my posts as being argumentative, I'm here to learn anything and everything I can.
Jim Mitchell
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« Reply #5 on: September 14, 2010, 10:29:39 pm »

Here is my last pass I made before the track officials told me to slow it down or pack it up. 6.34 @ 109.5 mph. http://s263.photobucket.com/albums/ii137/Mitchell302/?action=view&current=102_3893.mp4


Wow!!


The other car took you off of the line pretty good but it looks like that at the end you almost beat him, huh?
He went 6.29 to my 6.34, identical 60', 330' also. The big difference was his .512 reaction to my .870. Launching this car is a balancing act of flat-footing the throttle on the trans-brake and letting go when the boost gauge reads 5 pounds of boost. I really need a 2-step to get more consistant launches.
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Homemade twin-turbo 302.
Jim Mitchell
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« Reply #6 on: September 14, 2010, 10:34:36 pm »

Is that a football?
It sure is. I was looking to save a buck so instead of buying an airbag for the right rear coil I picked up a football from walmart, deflated it and stuffed it in there and inflated it to 8 psi. It does an awesome job of keeping the car from torquing over too much in the first 60'.
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Homemade twin-turbo 302.
Blk88GT
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« Reply #7 on: September 14, 2010, 10:43:01 pm »

Jim, I have to admit that I swore out loud when I saw the football.  Spt at PC That is classic. The wiring and wratchet strap terrify me as well, but therapy can fix it.

I am by far no chassis tuner, but there is a LOT more left in that launch.

Cheaping out on tires/suspension with a 9 second car scares me, but to each their own.

Give us some details on the combo!
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Ian
1988 Mustang GT - 8.97 @ 150.46 on 275s!
2006 GMC Sierra 2500HD LBZ with lots of goodies

Speedos irritate me
scienceguy
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« Reply #8 on: September 14, 2010, 11:38:36 pm »

Give us some details on the combo!

Here's a write-up he's made on his build up.
He also posted one here, but the following has more details.

Simply Awesome!

http://www.fordmuscleforums.com/induction-articles/496506-homebuilt-budget-twin-turbo.html

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1966 Mustang, Toploader 4-speed
Pump Gas, Flat Tappet 306
10.134 @ 134.71
Jim Mitchell
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Location: Maine

« Reply #9 on: September 15, 2010, 12:20:10 am »

Jim, I have to admit that I swore out loud when I saw the football.  Spt at PC That is classic. The wiring and wratchet strap terrify me as well, but therapy can fix it.

I am by far no chassis tuner, but there is a LOT more left in that launch.

Cheaping out on tires/suspension with a 9 second car scares me, but to each their own.

Give us some details on the combo!
The wiring is ugly but it actually is carefully layed out so it doesnt get pinched or chaffed. I would agree that the car needs some work on the launch but Im really just trying to see what I can accomplish with home remedies. At first I just wanted to see if stock suspension could go 1.6X, after I did a bunch of those I put in the UMI lowers and football and did a bunch of 1.55s. The mid 1.40s are accomplished by leaving with 5 pounds of boost as compared to 4 pounds. I want to see how much further I can go with this setup, before I do it ''right''. I am trying for high 1.30s.
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Homemade twin-turbo 302.
Jim Mitchell
Small Block
***
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Posts: 121


Location: Maine

« Reply #10 on: September 15, 2010, 12:21:31 am »

Give us some details on the combo!

Here's a write-up he's made on his build up.
He also posted one here, but the following has more details.

Simply Awesome!

http://www.fordmuscleforums.com/induction-articles/496506-homebuilt-budget-twin-turbo.html


Thanks, Mike.
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Homemade twin-turbo 302.
Blk88GT
"Champ"
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Location: Winnipeg, Canada
McNitrous


« Reply #11 on: September 15, 2010, 11:45:35 am »

Awesome article Jim. Well done.
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Ian
1988 Mustang GT - 8.97 @ 150.46 on 275s!
2006 GMC Sierra 2500HD LBZ with lots of goodies

Speedos irritate me
Jim Mitchell
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Location: Maine

« Reply #12 on: September 15, 2010, 05:55:36 pm »

Awesome article Jim. Well done.
Thank you sir. Its been a long year building it with alot of late nights out in the garage. Its all fun though, I've learned alot too.
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Homemade twin-turbo 302.
grslms51
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« Reply #13 on: September 15, 2010, 10:19:13 pm »

hey,Jim..did you make your own blow thru carb or buy one?..just wondering as i saw a great post on how to make a blow thru carb...it was step by step and looked pretty easy to do.
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69 Merc
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« Reply #14 on: September 15, 2010, 10:19:54 pm »

hey,Jim..did you make your own blow thru carb or buy one?..just wondering as i saw a great post on how to make a blow thru carb...it was step by step and looked pretty easy to do.


Link?
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Robert's 1969 Mercury Montego (FordStrokers 408W, QFT 850cfm RQ-AN, Super Victor, 2" aluminum open spacer, CamMotion HR .624/.609 251/256 108, 1-3/4" x 3" headers, Broader Performance RmV/B under a C6/4R100 behind a 8"/9" billet 5500 stall, 9" 4.56 Detroit Truetrac, M/T ET radial streets 315/60-15 on 10" rims)

The Merc started here = http://sbftech.com/index.php/topic,27178.0.html

Irwindale Speedway 1/8 mile (1st time at a track!) = 7.647 @ 90.78mph with a crappy 1.878 sixty foot (3850# race weight)

Present day Merc = http://sbftech.com/index.php/topic,34648.0.html


Except that engine building (properly) is a labor intensive industry.  Who do you think does all the measuring and machining?  Little engine shop fairies?  Not to mention assembly, mock up and parts fitting.

At Woody's level you are not just paying for his labor but for his skill set as well.

Thanks FordStrokers 408W, Westminster Performance Transmission (W.P.T.) transmissions, TCS Performance converters, Broader Performance valvebodies and last but not least a BIG thanks (always) to my friends here and abroad in the World!
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