The break-in drive was uneventful and with no drama..... and it's a hot-rod. <img src="/forums/images/graemlins/wink.gif" alt="" /><img src="/forums/images/graemlins/kewl.gif" alt="" /> The temperature gauge stayed just below the 1/2 mark the entire time, no matter how hard I pushed it - which wasn't too hard. I did see 5psi intake pressure from the blower a couple of times in O/D, but generally tried to keep it out of boost and never gave it full throttle. I didn't take it to 6000rpm - maybe 5000 a couple of times and let it coast down.

The exhaust note is so much better <img src="/forums/images/graemlins/notooth.gif" alt="" />....... it's not as loud as before when it drops down into O/D under load at 2200rpm.... and it doesn't lose the power curve in O/D at low rpm, so I guess the cams are working much better rolled forward to build more cylinder pressure. I may want to play with them some more, but so far, I like it much, much better than before. I think this time I've got a good engine combination..... can't wait to put it on the dyno. <img src="/forums/images/graemlins/smile.gif" alt="" />

I really had forgotten how nice this truck drives - a Gen1 in good mechanical shape is a really, really nice truck. <img src="/forums/images/graemlins/oink.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" />

Frank

Just heard it via phone and WOW! It sounds awesome. Can't wait to drive it....

Enjoy it while it lasts. You know what will happen if Larry or I drive it...

Dyno time today on the Mustang 1750. <img src="/forums/images/graemlins/kewl.gif" alt="" />

This time I went with 235/75/15 street tires, took out the rolling refrigerator aerodynamic correction factor of 20 and put in a Mustang factor of around 8.

On the first pull I saw about 180HP and 240 lb-ft torque at the rollers. <img src="/forums/images/graemlins/scared.gif" alt="" /> The engine is smooth as silk, very, very strong down low, pulls hard from the line and loves boost. Power begins to drop off after 5,000 rpm..... not bad for a truck at all.

Boost has dropped back to about 6.5psi - an indication that either the blower isn't as efficient after Magnacharger rebuilt it - or - this engine is pumping air a lot better than the last one. There's still a little overhead in the blower if I want to turn up the boost a bit.

I may need to roll the cams back a little, but I have no real fault with it like it is..... driveability is excellent.

We de-tuned it a little to be on the safe side, even though we saw no indication of knock. The last run after richening the mixture and some heat soak showed about 170HP and about 200TQ IIRC...... I'll get some graphs up when the files are sent to me.

I think we got it a little too rich because driving home at 70mph, it got slightly ragged when I gave it full boost.

All-in-all, it's great. I think it can be improved, but I'm concerned that I'm getting close to the transmission torque input limits.

I'll try to put up a couple of videos later.

Frank <img src="/forums/images/graemlins/cheers.gif" alt="" />

I was concerned that the intake might be restrictive, so I hooked up a vacuum gauge to the brake booster port on the intake duct before the blower and saw a steady 20in/Hg at idle and watched it fall to zero with power.... it got to zero as boost came on and stayed there through maximum boost...... so it's not at all restrictive. I thought I had a video of that run, but I can't find it.

Here's the first pull - a little ragged at idle at that point..... and the video cuts off before the pull is complete, but you can hear it beginning to scream:

Video 1

This is the second or third pull of 4 or 5 on the day - I can't read the final power numbers, but IIRC, they were about 173 on HP on this one... toward the end you can see the power begin to drop off:

Video 2

Here's a taste of driving - starting at the on ramp to I-20 ........ and after I got the speeding ticket <img src="/forums/images/graemlins/shame.gif" alt="" />

Video 3

This thing is wicked <img src="/forums/images/graemlins/evil.gif" alt="" />

Frank

Hot damn! That sounds incredible. Raped ape comes to mind. I can't wait for my turn in the seat <img src="/forums/images/graemlins/wink.gif" alt="" />

When I first transplanted the turbo motor into the 87, I was a little aprehensive about the tranny, given that I had eaten an m/t with the same motor. I called Mitsu CS and got the nice lady to connect me with a driveline engineer, who did some research and got back to me and told me that the aisin-warner is good for 300ftlbs. I wouldn't worry at your power levels. However, if you really crank up the boost... but with a blower as opposed to the turbo, you don't have as much room to really raise the boost. I know you can fool with pulley sizes, but if you get it to 200hp, I think you will be more than satisfied, and safe, tranny wise, at least. You might want to go to the 95sr big rear end, though, although my small diffs held up just fine at around the same 200hp.

Eddy, I expect that I'm already over 200HP and 300 lb-ft TQ. I can't be sure, but I'd guess somewhere around 215HP and 300 lb-ft TQ at the engine.

We've wondered before about the driveline losses and maybe I'm estimating those on the high side, but according to this, 40HP for an AW-372 and transfer case doesn't seem too much:



web page

There's no way to know without absolute numbers on the AW transmission and t-case - or putting a stock 3.0L on this same dyno, but if I'm seeing 180HP and wasting 40HP, that's 220HP. With the highest TQ number I saw today, add 60 to it and you get 300lb-ft.

What are the real numbers? I don't know and don't want to overstate them, but I'd sure like to put the engine on an engine dyno.

It's possible that we got a spike in the dyno on the first run.... dunno. I do know it pulls pretty good. <img src="/forums/images/graemlins/wink.gif" alt="" /> <img src="/forums/images/graemlins/smile.gif" alt="" /> Look closely at the initial acceleration in the 3rd video.

Frank <img src="/forums/images/graemlins/cheers.gif" alt="" /> <img src="/forums/images/graemlins/scared.gif" alt="" />

The number the engineer quoted me was stated in rwhp, because I asked that way, as I didn't think I'd ever have access to an engine dyno. He said it was very likely good for 400ftlbs at the flywheel, a very stout box.

I've always been suspicious of hp losses in the tranny. 40hp loss is over 100,000btu/h, and I'd think the tranny would be a puddle of aluminum after much of that, as tranny fluid cooling is quite small in capacity. I think using the big loss numbers is a way to brag about flywheel hp, sort of like using brake hp instead of sae net hp, but I'm a suspicious old fart...

In any case, the strain on the tranny is in the higher gears when the engine is pulling against the largest resistance, and my a/t locked up the TC above 42mph even in 3rd, so the losses should be less.

What gear did you use for the pulls? I would guess the largest losses are in 1st with all the gear monkey motion...

That was 3rd gear at 1:1 for all pulls. One reason the start of the first video sounded so ragged was getting the transmission to up-shift to 3rd before putting power to it slowly so it wouldn't down-shift and screw up the test.

You might be correct on the HP losses being fodder for overstating engine fantasies........ I just don't know enough to know what I don't know about some of the things I read and hear.

If the transmission will hold 400lb-ft from the engine, then I'm way below that and quite safe.

Frank