PAP348 DYNO RUN

Yesterday was just another boring day here,so i thought it would be cool to do a ramp run on my mates chassis dyno to see what HP my stock 12/91 348TB could pull. Then,i decided to drop the exhaust off the car and run straight through pipes out of the cat convertors and do another ramp run to see the horsepower increase. Here are the 1st run results with the stock 348 exhaust. 28'c ambient air tempreture in the workshop,engine at normal operating temp and car in 4th gear>>

302.5HP at the flywheel.
241.1HP at the wheels.
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And here are the results without the exhaust. 2.1/4" pipe from the cats back to 2 new exhaust tips. The 2nd run was done with the same workshop air temp of 28'c and engine at normal operating temp,car in 4th gear again>>>

312.6HP at the flywheel.
249.6HP at the wheels.

Around 8-10HP increase.
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Yeah,we actually thought it would make a few more ponies on the dyno than it did,because the stock exhaust looks really restrictive with the really tight bends that it has on both top and bottom mufflers. Still good fun.

 

My pleasure Mike,the owner of the workshop does alot of custom turbo installs and is trying to talk me into twin T44 turbo's for the old girl He has them there and said we should make a start on it next week when im on days off again
Very very tempting.....................

 

I have before and after short video clips on the dyno too,but im in the process of figuring out how to post them or the link to them. I cannot really pick the engine note difference in the clips on my computer. Maybe cause i have sh*t computer speakers and sub Nah,I think it is my digital camera? Either way,it is cool and ill try get them on here asap

 

The engine sounds amazing at high RPM! At idle though,it has a slight chunky turbo car note(which i dont really like) but.........once you are cruising around it sounds great,alot louder,but really nice. I gave it some sting over a big concrete bridge we have here,with high concrete sidewalls so to speak around it and the engine note reverberating through there was soooooooooooo awesome! I love it! Sounds really really cool! The dyno calculates the figure from rear wheels to flywheel and the dyno figures at the rear wheels are 100% acurate. You can see the difference in the figures on both dyno printouts posted. The dyno basically "guesses" the flywheel HP figure. It made a 10HP gain at the flywheel and a 8HP gain at the wheels. At the rear wheels is the accurate 8HP power increase.

 

By memory,transaxles are very effeicent and average a 18% drivetrain loss as compared to front engined/rear wheel drive cars that have around 33% drivetrain loss. Or close too anyways

 

I thought they all had the dual setup?? I have the top and bottom mufflers. Its a win win situation all round with them removed. The engine bay temp is around 50% cooler i reckon. There was alot of muffler/metal in the engine bay,and as you can see in the pic of just the pipes,its really opened up the area around the airbox and standing at the rear of the car on the dyno,it seemed alot cooler in that area after the dyno run with only the pipes attached. And also,both them mufflers must weigh around 15Kg each,so there is around a 30Kg weight loss the car has also saved . I still have both mufflers and all the clamps/bolts ect...and it would only be a 30min job to remove the pipes and refit the stock exhaust when i get pulled up by the cops.........................and it WILL happen hehe

 

Finally worked it out. The 2 links are below, Ones 2.31MB and the others 8.35MB so I hope you have broadband.

You will need Quicktime to watch the vids sorry so it might prompt you to install it on startup.

http://media.putfile.com/348-Dyno-1

http://media.putfile.com/348-dyno-2

Enjoy..........

 

Hehe,its very tempting isnt it? Its a very very easy job in the back of the 348. Theres a mountain of room there now Ahhhhhhhhhhhhhhhhhh,one of lifes toughest decisions

 

Im really happy with the performance of the car stock. At the moment with the exhaust off,it seems to pull a little harder at high RPM and a few times already it has spun straight to the rev limiter quicker than it normally would have. The fantastic engine note at full noise makes you want to pin it in 1st and 2nd gear all the time!

 

I thought it would sound more like twin hairdryers