288 GTO, 487bhp from dyno tuning only

IIRC the 512 BBi had the same kind of spare wheel ..

 

With std boost (0.8 Bar=11/12 lbs), I think you've confused yourself...

I "think" the test has produced a 414BHP flywheel figure, but read from the tyre...

So they've found 14BHP over Ferraris' claim... but drivetrain losses and tyre sampling could render it all meaningless.

Theres no way a 288 with some mapping but std boost (or + 1 lb) can be tuned to add 87 BHP.

BUT, it is totally safe to up the boost a little and make that kind of BHP without any kind of worry.

LOVE the 288. best car ever, bar NONE.

edit.. read the first link properly.. they claim to be "414 at tyre and Ferrari say 400 at flywheel"... if thats the case, I say the test is BS or the car is non std and/or overboosting

 

If you are so unluck to get a flat, what would you do with the, lets say flat reartire? It wouldn't fit where the spare tire was.
Simply throw it on the frontseat?

Okay, maybe a stupid Q

 

Amen!
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288 GTO is a perfect car! Nothing wrong, everything right! Perhaps the only thing I would change is the seats because I'm picky and only like Recaro Profis...

 

I saw one of these yesterday. I cried. BEAUTIFUL.

 

You can not calculate drivetrain loss in an fixed percentage. Its an to rpm related power loss wich can only be messured on the dyno. After the wheel hp is messured with pressed clutch and the gear in wich the wheel hp was messured still selected .. wait till the car is rolled out to idle. What the dyno messures in this rollout is the drivetrain loss and this has nothing to do with the engine hp.
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Samy

 

Sure 414 RWHP is the result after tuning, not in stock condition, when it would have had perhaps mid 300s at the tire. I certainly think it's believable. Turbo cars typically get massive gains from very basic mods, one of the beauties of forced induction.

 

This test is claiming std boost and just mapping has gained the new figure.

F40's chips ALL have raised Boost levels (and a mod to bypass the over boost cut off etc)

I'd say this 288 test is not accurate. I'd go further and guess that the car was a garage queen previously, and the waste gate is not operating properly, allowing extra boost. It's very common with Porsche turbo's from the 80's too.

I could be wrong, I'd love to be 'cos I love the 288 more than any car, but they don't have 487 flywheel BHP in std form, with or without fine tuning. But it's easy to get that figure by boost increasing.

 

The Drivetrain loss cames from friction in the drivetrain and is fixed over rpm.
For exampel an engine 200hp on the dyno messured to 6900rpm. At 6900rpm it has 35hp drivetrainlos. Drivetrainlos is always highest in highest rpm. It goes up on rpm like an exponential function. So now i tune the car to 250hp on the dyno second run 250hp and maximum drivetrainlos at 6900rpm 35hp (can change a bit due to temperatures of the wheel and dyno ..). So now the problem if i messure it at 200hp get 35hp drivetrainlos calculate how much % it has loss then i make or can make hundrets of failures.
first calculate the loss depending on the maximum wheel hp and maximum drivetrainloss but the maximum wheel hp is maybe at 5400rpm and loss at 6900rpm so thats wrong. But even if you calculate the loss from 5400rpm and the wheel hp from 5400rpm you have the drivetrainlos for that fixed setup on that fixed rpm. But if you now take this % of loss and put that % loss to another rpm that doesn't fit ... or if you tune the car to 250hp you took the same % of loss you calculate a higher drivetrainlos then the car has! A 200hp has 20hp loss and 400hp has then 40hp loss f.e. and thats totaly wrong. Go to an good dyno wich can messure the drivetrainloss i don't understand why there are such low tech. dynos wich can't messure drivetrainloss.
Here an exampel two dynoruns with tuned hp and both the exactly same drivetrainloss .. and if you look how drivetrainloss works its normal because you messure the drivetrainloss with pressed clutch with no engine so it doesn't matter if the engine is running and has 500hp or off and 0hp

http://www.vmax.de/jpg/audi_a4_18t164_vorhernachher.gif
http://www.vmax.de/jpg/calibra_lauf002.jpg
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Samy

 

You CANNOT measure anything from a chassis dyno, you can only compare.

There are just too many variables.

 

On my dyno i get the hp and torque +/- 3 hp wich are messure on our engine dyno. So i would say its not only to compare. But there are at least 90% of the dynos crap made by people who learnd engineering from an video tape. The FIR Filters mostly doesn't work right. Some don't managed to get an lossmessurement to work....
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Samy

 

And then, only on the exact same dyno!

But, as Node originally said, it is an excellent tuning tool.

 

Just wet my pants
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It only has 500 miles!