Porsche 944 turbo road to racecar.

[da9jeff]

You did say the ratios were way out for your current power band.... the PPG set looks nice and close for circuit work. Your car and money but id be going down that route before looking at dropping 50 large on a sequential.

[MrBoost]

Agree that you need ratios to suit the powerband but surely a bigger powerband is preferential? Two motors, both with close ratio boxes, both with the same peak number however one motor has that peak more to the left and a much broader powerband through capacity and/or compression/porting/better use of turbo. How can the peaky motor be quicker, bearing in mind all other things are equal? Porsche Cup cars and Super Taxis are too wildly different to compare.

Nick - he has gone from the big motor to the small peaky motor and is now slower.

I know he went slower - but that is because he ran a 'peakier' engine with a gearbox that is more suited to something with
more low down torque. It wasnt the engines 'fault' its a combination error.

Look at it like this, why does f1 indycar etc etc run such high rpm? Because the only way to increase power is to have more
explosions (they are all obviously capacity governed in their rules) so they run the max rpm they can to have more cycles
of explosions (hence more power). They then gear the cars to work up in this powerband area which has higher power.
If you have built an engine that has the same peak value to the left then effectively you have built an inefficient engine.
All engines should raise power as revs rise to the desired cut off point. (which is either imposed rev limit or physical limitations
of the engine - which is what happened to this porsche) if they dont then something is wrong (not that it can be fixed in most cases)

Obviously though you dont want a literal mountain peak engine but id certainly want to use a higher rev range than a lower one if it meant
i had more power up there (provided i could gear to use it)

[333pg333]

It's true. And yes, we have a motor that isn't totally suited to our particular car for Wakefield Park. Would probably work better at Eastern Creek. It wouldn't be too difficult to make some changes depending on requirements. If someone wanted this for a club or targa car I'd run it with a different turbo (GTX3076 or GTX3576) and maybe play around with X-over and exhausts. Not sure if our 3" system may be holding it back. You get varying opinion on exhaust (post turbo) sizing. Plenty of higher hp cars running through 3" system but then perhaps going slightly larger might also free up response times with turbo. Probably have to run some more sensors to find out. There are also people saying that since we made changes to the Xover and wastegate system that we might actually benefit by going back to the .82 house. Not only in reducing some backpressure but even picking up response. This seems obviously contrary to what you'd think re the response, but I'm certainly no expert. Might try this in the future.

[MR-PUNANNY]

Hey, what rear Wing are you using and do you have any contacts as I need one

[Sport4]

Hey, what rear Wing are you using and do you have any contacts as I need one

Give Gorilla Industries a try man :D

[333pg333]

Hey Shane. Wing is from the UK. DJ wings designed by Simon McBeath who apparently knows a thing or two about aero. I'd like to do more testing of this one actually. We've hardly played around with it at all.

[MR-PUNANNY]

Thanks dude.

Joel, GI only do gay japanese brands haha

[333pg333]

Decision would be single or dual element. Roughly speaking the dual will give more downforce but sacrifice speed due to drag.

[Mr Ed]

DRS bro

[333pg333]

I wish!!

[morerevsm3]

Paul and I...

[333pg333]

Hey, cool pic. He said that weekend was really good, but a long drive from Sydney. Did you get to check the Kart out? He put it together himself. Looks Mint!

[morerevsm3]

yes, had a really good look at his kart, and spent most of the day talking shit and telling bad jokes to him and Matt

[333pg333]

This just in today. Putting the small motor back together as that looks to be our only option for this years WTAC. It never ends it would appear...

[Slides]

Bugger. Good excuse for bigger studs/bolts?