503rwhp Cam Only LS2 by PatG

[gsd2000]

Another interesting thread but this time a cam only LS2 by PatG

Granted the cam was a little on the big side, but still a well designed setup

http://ls1tech.com/forums/dynamometer-results-comp...

[jameshsv]

I am very impressed.

[mikeyb1987]

Impressive results (as with the other thread)- over 100rwhp from cam and under-drive pulleys. Particularly when they are with standard heads.

Out of interest, what reduction in losses are people gaining with under-drive pulleys?

[jameshsv]

I am very impressed.

[Gary H 2008]

Funny looking power graph

[ARAF]

Gary H 2008 said:

Funny looking power graph

V-tec kicked in.

[KMud]

mikeyb1987 said:

Impressive results (as with the other thread)- over 100rwhp from cam and under-drive pulleys. Particularly when they are with standard heads.

Out of interest, what reduction in losses are people gaining with under-drive pulleys?

~10hp I think.

[SturdyHSV]

KMud said:

mikeyb1987 said:

Impressive results (as with the other thread)- over 100rwhp from cam and under-drive pulleys. Particularly when they are with standard heads.

Out of interest, what reduction in losses are people gaining with under-drive pulleys?

~10hp I think.

This sounds like the beginnings of a group buy already

[ArnieVXR]

Nice to see someone repeat that build over here> some valuable lessons to be learned.

[monkfish1]

Be nice to see a stock LS2 with pipes only make 390rwhp over here. I think that tells you a lot.

[ArnieVXR]

monkfish1 said:

Be nice to see a stock LS2 with pipes only make 390rwhp over here. I think that tells you a lot.

What are you suggesting

[ARAF]

ArnieVXR said:

monkfish1 said:

Be nice to see a stock LS2 with pipes only make 390rwhp over here. I think that tells you a lot.

What are you suggesting

Either the ponies are smaller, or the numbers are just pony.

[jonnM]

ARAF said:

ArnieVXR said:

monkfish1 said:

Be nice to see a stock LS2 with pipes only make 390rwhp over here. I think that tells you a lot.

What are you suggesting

Either the ponies are smaller, or the numbers are just pony.

If it wasn't at SRR it doesn't count anyway

[KMud]

SturdyHSV said:

This sounds like the beginnings of a group buy already

Don't think I'm not tempted to underdrive. It's expensive gains, but not the silliest available.

[monkfish1]

jonnM said:

If it wasn't at SRR it doesn't count anyway

And if it was, it would be circa 330-340rwhp.

[ARAF]

monkfish1 said:

jonnM said:

If it wasn't at SRR it doesn't count anyway

And if it was, it would be circa 330-340rwhp.

Sam's LS2 was under 330rwhp at SRR, with CAI, Cat back and remap. Not sure he had the headers then (2009).

[monkfish1]

ARAF said:

Sam's LS2 was under 330rwhp at SRR, with CAI, Cat back and remap. Not sure he had the headers then (2009).

Should have said "at best". So 392 minus 15% gives about 333bhp. Believable. Deduct the same % from 502rwhp and that drops you to 426rwhp ish. Which sounds totally sensible.

Read into it what you will

[M11 MFP]

Peak BMEP on this is even more crazy, 224.6 psi @ 4800 rpm, with a 20% driveline loss incorporated. It still has a BMEP of 208.8 at 6600 rpm.

For reference the current road car record is the 458 Speciale (218.71 psi @ 6000 rpm)

The absolute best Nextel/Sprint Cup motors (derestricted, 4.185 x 3.2, with all the tricks and very good fuel) may achieve 225 psi at circa 7500 rpm.

Formula 1 2.4 v8 (2006), around 221psi @ 17500 rpm, but retaining an incredible 212+ psi @ 19250 rpm. Straight raw power being the aim here, rather than max mid range torque / BMEP.

Circa 605 fwhp is simply not possible from 364ci NA at those chugging revs.

The key to fabricating dyno charts is not to apply the falsification broad brush across all revs. Outrageous power claims can only be backed up with superb flow (high BMEP retention) at elevated revs, 7500 at least to provide these figures.

As MF says, probably about 15% inflation on this dyno.

I think Mikey, Monaro5.7, R8 Black et al are much closer to the optimum than the above would suggest.

Edited by M11 MFP on Thursday 11th December 18:07

[MyM8V8]

M11 MFP said:

Peak BMEP on this is even more crazy, 224.6 psi @ 4800 rpm, with a 20% driveline loss incorporated. It still has a BMEP of 208.8 at 6600 rpm.

For reference the current road car record is the 458 Speciale (218.71 psi @ 6000 rpm)

The absolute best Nextel/Sprint Cup motors (derestricted, 4.185 x 3.2, with all the tricks and very good fuel) may achieve 225 psi at circa 7500 rpm.

Formula 1 2.4 v8 (2006), around 221psi @ 17500 rpm, but retaining an incredible 212+ psi @ 19250 rpm. Straight raw power being the aim here, rather than max mid range torque / BMEP.

Circa 605 fwhp is simply not possible from 364ci NA at those chugging revs.

The key to fabricating dyno charts is not to apply the falsification broad brush across all revs. Outrageous power claims can only be backed up with superb flow (high BMEP retention) at elevated revs, 7500 at least to provide these figures.

As MF says, probably about 15% inflation on this dyno.

I think Mikey, Monaro5.7, R8 Black et al are much closer to the optimum than the above would suggest.

Edited by M11 MFP on Thursday 11th December 18:07

Nice piece of forensic analysis Rob.

[monkfish1]

MyM8V8 said:

Nice piece of forensic analysis Rob.

Totally agree.