2,4 type4 turbo 500hp -on gasoline- goal

[Clonebug]

Don't know what I win , but , I'll guess 195 hp.

A drive in my car when you’re over here
Without further mention I assume all hp’s are flywheel.

I assumed the hp you posted of 189 was wheel hp....If not then I need to adjust my numbers.

I have both listed.

[saltgrinder]

Hmmm , my 4 stroke KTM has an expansion chamber on the akropovic header pipe similar to that , FMF do the same . Goes faster

[Wally]

I have both listed.

Thanks for that mate! Good to be clear on that important difference.
The 189hp from last time (2,2ltr) was indeed FWHP, FWIW

When dynotime is there, I'll try to make a picture of both whp and the correction they apply.

On my regular dyno, whp and the corrected fwhp are both nicely put in the same graph. The dyno in Germany I have the appointment for is somewhat more rudimentory, allthough pretty accurate and certainly not optimistic in its output.

[Wally]

Hmmm , my 4 stroke KTM has an expansion chamber on the akropovic header pipe similar to that , FMF do the same . Goes faster

You haven't seen the inside, its not the same

[Clonebug]

I have both listed.

Thanks for that mate! Good to be clear on that important difference.
The 189hp from last time (2,2ltr) was indeed FWHP, FWIW

When dynotime is there, I'll try to make a picture of both whp and the correction they apply.

On my regular dyno, whp and the corrected fwhp are both nicely put in the same graph. The dyno in Germany I have the appointment for is somewhat more rudimentory, allthough pretty accurate and certainly not optimistic in its output.

Ahhh.....In that case I need to adjust my guesstimate.....

[Clonebug]

My new hp estimate is....
202.5 FWHP at 7500 rpm and 80* IAT's

[Wally]

Interesting!

My own guesstimate is 210-215 FWHP and with proper compression ratio it should have been about 100hp/ltr, so about 25-30 more then with the current low CR.
2,5 weeks and counting..

[Clonebug]

My guess was using my fav calculator at default settings. You might be able to do better.....I'm looking forward to the info so I can plug your numbers in and see where I can adjust to match.
I use that calculator quite often so having good numbers is going to be really interesting.
It will be really interesting once you have that baseline.....to see how much hp you gain at 14.7 lbs boost and beyond.
If you can it would be fun to see what numbers you make at N/A, 7.35 lbs boost 14.7 lbs, 22.05 lbs. and then beyond.
I've been beat up by people that say you can double your hp at 11-12 lbs boost but I still think it's 14.7 to double since it is just atmosphere and beyond. If anything I would think it would take a little more boost to double but it is all dependent on IAT's, Timing and also engine efficiency.
We will see once you do the testing for us.......

[Wally]

My guess was using my fav calculator at default settings. You might be able to do better.....I'm looking forward to the info so I can plug your numbers in and see where I can adjust to match.
I use that calculator quite often so having good numbers is going to be really interesting.
It will be really interesting once you have that baseline.....to see how much hp you gain at 14.7 lbs boost and beyond.
If you can it would be fun to see what numbers you make at N/A, 7.35 lbs boost 14.7 lbs, 22.05 lbs. and then beyond.
I've been beat up by people that say you can double your hp at 11-12 lbs boost but I still think it's 14.7 to double since it is just atmosphere and beyond. If anything I would think it would take a little more boost to double but it is all dependent on IAT's, Timing and also engine efficiency.
We will see once you do the testing for us.......

Hehe! I have seen many times on my former engines that 1 bar of boost (14.7psi) will indeed pretty much exactly double hp, regardless of cam/heads/turbo. Proper(!) tuning, intercooling and no exhaust restrictions are paramount for this though.
On the last version N/A was 189 and 1 bar gave pretty much 400hp or a tad over it. However that was on different dyno's.. They seemed pretty accurate as that was what I expected to run.


Both runs (n/a and boosted) had their share of issues in hindsight though. The NA run could only run single spark (due to the type of off-the-shelf-exhaust) and had a rocker hitting the valve cover stand as well. On the boosted run, I had weakening spark when revs got higher as was proven by rapidly decreasing torque and not being able to run simultaneous sparks on the twin spark operation: had to give a few ms difference between both sparksplugs to run right without. After fixing an extra ground on the ecu, this problem has been solved. Noticebly! So I have good hopes of a really good n/a run this time. I learn and improve all the time, it sometimes takes (a lot) of time though before I figure it out

So, in short, I haven't seen very conclusive evidence of noticebly better the 100% improvement being real, but it could be. I am more inclined to agree with you though. My fuel table is also always filled out with 1:1 boost-fuel increase linearly.

The dyno in Germany is not really suited for this kind of accurate testing tbh, but when time is there again, I will hopefully be able to do these tests on my 'regular' dyno where I have lots of reference from.

[Wally]

2,5 weeks and counting..

Due to extension of Covid measures, the dyno schedule has been cancelled for now. This was to be expected somewhat of course. Not sure when this will be possible atm, but will keep you guys informed.

[Clonebug]

I would think that a dyno run should be classified as something essential.......for sanity's sake at least.......

[buguy]

I agree!

[Kalle]

Interesting Hotel California theory Wally! Thanks for sharing and please keep those vidoes coming.

-K-

[Wally]

Interesting Hotel California theory Wally! Thanks for sharing and please keep those vidoes coming.

-K-

You mean this I think:
https://youtu.be/BtMY2drBCBc

[Bruce.m]