Drag Racing Discussions > Front Engine Dragsters

Seeking FED Wisdom

(1/4) > >>

Mike Lawless:
Howdy everyone. New to the site. I've been drag racing for nearly 45 years, so I am no newcomer. I've raced door cars all that time. Recently, the time has come to hang up my driving suit, and crew for my son. We are in the research phase of building a dragster using my existing turbo charged methanol burning air cooled VW engine with the goal of running NE2. The motor is a proven performer and makes just shy of 500hp with fairly low boost (15psi). We will probably run in NE3 at first to get the kinks out, although the motor has run the door car to 9.70. So NE3 could be achievable with ridiculously low boost

We have challenges to overcome to be certain. I am a hobbyist machinist and more than capable of custom fabbing odd-ball parts, and I am an accomplished welder.

Some my initial idears make sense to me, but I may be off base. One such idear is to use a turbo 350 trans rather than a PG. The VW doesn't make the bucket load of torque than a V8 does, but enough to get a 2000lb door car into the mid 1.30 60 foot range....with a stick trans and 7000rpm launch.

So, the first question, since the build will center around the drivetrain, is a turbo 350 a hair brained idear?

wideopen231:
 IMO 350 is not best choice.May work well with 500 hp. Limited on parts choice and no wear near the parts developed for it as a PG or turbo 400. My lile brother runs aPG behind a turbo VR6 VW engine although not air cooled version. He was making about 700 before new build ao not really apple to apple comparison. He has run 4.90's 1/8 mile in a door car,but it only weight 1730#.  In a fed you should be really lite. I can see you being close to 1100# or less with minimal cost. Use bare minimum spec tubing's and watch every piece weight wise and I think you will find a glide will work great. Get a lower gear and few up grade parts and you should be golden. A plus is if PG don't work for you a 350 or 400 is simple bolt up with different length driveshaft. Plus with your power level will not have a ton in a transmission. I ran a basic PG with,valve body and clutches upgrade for 2 years behind a alky injected 454 before I started braking stuff and then a better input was biggest change.

Good luck and enjoy .Should be fun project and your machinist skills will come in handy. Different is lot more work,but thats what makes it fun and cool.

Curly1:
My opinion for what it is worth is the 350 would be a better choice than a powerglide for your car because of low first gear and three speeds. Also you may want to look into the Metric 200? Transmission. I think that is what a lot of the Super Stock racers are using and they work well. But those are probably expensive and they may be using them because of class restrictions?

As you know torque converter with that motor is going to make a huge difference. Too tight and it will not get out of the hole. If you are not sure go to the looser side.

Mike Lawless:
Thanks guys.

Curly, the lower first gear was why the T350 is being considered. Not only is the low end torque a factor, but also the ability to move on a .4 pro tree. I've never had the motor dynoed to see where it makes peak torque, but based on the way I run it in my door car, I think the rpm is up there comparatively high. Maybe as high as 6000rpm.

You are right on the converter. It will be a very important decision for certain. It's been a LONG time since I raced in a car with an auto trans and converter, so I am certain the technology has changed a bunch. The early VW dragster guys had problems. But maybe there are enough small motor combos (2.2liter) out there these days that a basic formula has been figured out?

At any rate, I'm thinking that drivetrain decisions will need to be made before a single stick of tube is put in position. Tire diameter, trans housing, motor plate thickness (since we need to adapt a flex plate to the back of a VW crank AND allow for converter snout register) fore/aft motor position....not to mention how we're gonna hang a starter on it.

Makes me ask what the heck I'm getting myself into!

rooman:
Loading the motor against the converter should help it make boost early as opposed to revving it up and dumping a clutch. I would go with the powerglide. As already mentioned it is lighter and has much more in the way of parts available both new and used.

Roo

Navigation

[0] Message Index

[#] Next page