Surprising Power From VE SIDI

[Wonky]

Guy I know took his fairly new SV6 with SIDI motor to a dyno evening in Hallam last Friday night. I'm sure it's still stock engine wise except has V8 mufflers on the rear (twin pipes each side).

I've seen an early VE SV6 run high 120s at Chev's, so was amazed when this one ran 174.0 rwkw!! I suspected a happy dyno until he told me his mate's VZ SS A4 only ran 188rwkw on the same dyno, same night!

Looks like SIDI!!

[JezzaB]

Ran one the other day, 160rwkw. Good bit of gear.

Tuned a Alloytech VE Speedway car that had some headwork and mild cams that ran 207rwkw. That was fun Obviously there wasnt much of an exhaust.

[CLUBRED]

Be interesting to overlay the 2 graphs.

[JezzaB]

Be interesting to overlay the 2 graphs.

Wouldnt look real pretty. Speedway cars top out around 120-140km/h. Sever gearing. This had a 2 speed box.

[CLUBRED]

Sorry, refering to the SV6 and VZ SS...

[Wonky]

I now have a dyno sheet for the V6 which I'm aiming to get up shortly, but not for the SS.

[ATOMICSS]

Would be interesting to hire one of these things for a day and take it to the track for a bit of a lark. You'd think a very very high 14 second run wouldnt be out of the question.

[Wonky]

The dyno sheet. Ignore torque figures as they'ree obviously incorrect.

[iloveholden]

Geez thats good stock power from a V6...i wouldnt mind driving one to see what they are like.

[GHZ28]

What I find most surprising is the torque figure on the dyno sheet. Holden spec sheet says 290 nm at the engine for the SIDI, but this dyno manages to measure an average of around 650 nm at the wheels.
As dynos can only measure torque, and derive HP/KW from that via a formula, surely that throws some doubt on the dyno KW figures. The torque figure shown is simply impossible for this engine to produce without at least 1 BAR of boost without any losses.

Where is the flaw in my thinking?

gh

[feistl]

Where is the flaw in my thinking?

No, your logic is correct. You attention to detail let you down a little though...

Ignore torque figures as they'ree obviously incorrect.

[VTSS350]

What I find most surprising is the torque figure on the dyno sheet. Holden spec sheet says 290 nm at the engine for the SIDI,

gh

That is for the 3.0L SIDI motor.

Its an SV6 that was put on the dyno and holden claim 350nm

[GHZ28]

OK, given both the above explanations, if a dyno can only measure torque, and from that derive HP/KW, how can you say the torque numbers are wrong and accept the KW figures.

HP/KW are only derived figures, not measured figures.

gh

ps it was a bit late when I made the first post.......

[BOOGER]

Pity the 3.0 SIDI isn't as impressive. An absolute dog to drive.

[SHANESVZSS]

Pity the 3.0 SIDI isn't as impressive. An absolute dog to drive.

yep 110% agree , i went along with my brother to test drive a my10 sv6 a6 and fg a6 , and ( i hate to admit it lol) the fg went alot better and had more down low torque and just seemed to do things easier.