Dalannex

I am going to pick up my 1981 from Dynotune Speed and Performance today. They got the dynotuning with the new accel dfi done yesterday. Hopefully I like the results.

I haven't seen the dyno sheet yet but he told me on the phone that it made 270 HP and 480 ft. lbs. torque. The HP number seems low to me, but then again he said it made 370 ft lbs. at 1500 RPM. He didn't rev it past 5600 rpm. That's a nice torque number and is what I was shooting for when I built the 406, but It would be nice to have a higher HP number just for the sake of telling people who don't understand these things. It's easy to tell somebody who isn't a gearhead that you have 300+ hp and they think you have something, but if you tell them you have 270 HP they think hopped up rice burner hp.

I personally think that 270 hp and 480 torque at the wheels is plenty respectable especially for a motor that I built myself. I see no reason to be too ashamed of those numbers.

I'll post some pics and impressions sometime this weekend.

-Justin

kevinator80

I am not one to brag unless I can back it up, but with 480 torque all you gotta do is put them in the seat and I bet they will be impressed. I told gator79 that my heads were probably limiting my hp but the torque should be really good. His response was "Ill take torque any day, I'm not trying to run 160mph". I couldn't argue with that.

Budman68

That car is going to scream down low. 270hp is not bad. Is this a TPI system?

SmokedTires

Sounds like you should have some fun when you get it back EFI/DFI is a great upgrade

Dalannex

It is a multi-port system with a throttle body set where a carb would be. It's not a tuned port the way I understand it because it doesn't have the tuned runner intake.

I had to fine-tune on the tv cable (did I mention how helpful the fine folks at bowtie overdrives are???? ) and for some odd reason the guys at the shop didn't hook up the tach and the check engine light so I will need to figure that out.

Anybody here know how to hook up either one of those items??



-Justin

majic1984

Wow.. you must be making your torque at incredibly low rpm.

rodesmg

you did it yourself, be proud

jpatrick636

I don't know your set-up, but based on the torque it seems there is something that's not breathing. There is definately more HP in that motor!

jackson

I understand the 270hp/480tq is at rear wheels.

The tq looks great! But the hp seems very, very low. Other than dfi, I dunno what's in your 406 & drivetrain ... but w/480 rwtq I'd expect at least 75-100 more rwhp. I have to admit, while I have much experience with engine dyno, I have very little chassis dyno exp. Maybe the disparity between rwhp & rwtq has to do with an automatic trans/torque convertor and their torque multiplication effect? Dunno?

Fevre

Cam specs might shed light on it

zwede

I suspect the 480 rwtq is a spike and not a true number. Some shops like to run the car through the gears and at the shift there's a big torque spike that shows as "max torque" in the printout. Also, with an automatic any torque reading below the stall speed will be multiplied by the convertor to some degree and is not a true indication of engine power.

Dalannex

my cam is a .467"/.494" lift, 278/290 duration hydraulic flat. Sportsman II heads, 11:1 CR. I think it could use more cam. Maybe a roller setup sometime in the future.

I need to clarify. He told me 480 torque on the phone, but last night after I returned from a camping trip I looked at the dyno sheet and it says 278.9 hp and 396.1 torque. He must have meant it made 480 for a spike or something. It's amazing how flat the air/fuel graph is. It is between 13 and 13.7 all the way through the pull. The car really does run nice and pull nice. It's real fun to drive.

stickboy

nice. I've got DFI on my and a 400 block sitting in the garage. Unfortunately it's going to sit until I get some more money coming in